UPDATE: Lead author Ben Laken responds in comments below.
I’ve reported several times at WUWT on the galactic cosmic ray theory proposed by Henrik Svensmark which suggests that changes in the sun’s magnetic field modulate the density of Galactic Cosmic Rays (GCRs) which in turn seed cloud formation on Earth, which changes the albedo/reflectivity to affect Earth’s energy balance and hence global climate.

A new paper published today in Atmospheric Chemistry and Physics suggests that the relationship has been established.
Figure 1 below shows a correlation, read it with the top and bottom graph combined vertically.

As the authors write in the abstract:
These results provide perhaps the most compelling evidence presented thus far of a GCR-climate relationship.
Dr. Roy Spencer has mentioned that it doesn’t take much in the way of cloud cover changes to add up to the “global warming signal” that has been observed. He writes in The Great Global Warming Blunder:
The most obvious way for warming to be caused naturally is for small, natural fluctuations in the circulation patterns of the atmosphere and ocean to result in a 1% or 2% decrease in global cloud cover. Clouds are the Earth’s sunshade, and if cloud cover changes for any reason, you have global warming — or global cooling.
Well, it seems that Laken, Kniveton, and Frogley have found just such a small effect. Here’s the abstract and select passages from the paper, along with a link to the full paper:
Atmos. Chem. Phys., 10, 10941-10948, 2010
doi:10.5194/acp-10-10941-2010
Cosmic rays linked to rapid mid-latitude cloud changes
B. A. Laken , D. R. Kniveton, and M. R. Frogley
Abstract. The effect of the Galactic Cosmic Ray (GCR) flux on Earth’s climate is highly uncertain. Using a novel sampling approach based around observing periods of significant cloud changes, a statistically robust relationship is identified between short-term GCR flux changes and the most rapid mid-latitude (60°–30° N/S) cloud decreases operating over daily timescales; this signal is verified in surface level air temperature (SLAT) reanalysis data. A General Circulation Model (GCM) experiment is used to test the causal relationship of the observed cloud changes to the detected SLAT anomalies. Results indicate that the anomalous cloud changes were responsible for producing the observed SLAT changes, implying that if there is a causal relationship between significant decreases in the rate of GCR flux (~0.79 GU, where GU denotes a change of 1% of the 11-year solar cycle amplitude in four days) and decreases in cloud cover (~1.9 CU, where CU denotes a change of 1% cloud cover in four days), an increase in SLAT (~0.05 KU, where KU denotes a temperature change of 1 K in four days) can be expected. The influence of GCRs is clearly distinguishable from changes in solar irradiance and the interplanetary magnetic field. However, the results of the GCM experiment are found to be somewhat limited by the ability of the model to successfully reproduce observed cloud cover. These results provide perhaps the most compelling evidence presented thus far of a GCR-climate relationship. From this analysis we conclude that a GCR-climate relationship is governed by both short-term GCR changes and internal atmospheric precursor conditions.
I found this portion interesting related to the figure above:
The composite sample shows a positive correlation between statistically significant cloud changes and variations in the short-term GCR flux (Fig. 1): increases in the GCR flux
occur around day −5 of the composite, and correspond to significant localised mid-latitude increases in cloud change. After this time, the GCR flux undergoes a statistically significant decrease (1.2 GU) centred on the key date of the composite; these changes correspond to widespread statistically significant decreases in cloud change (3.5 CU, 1.9 CU globallyaveraged) over mid-latitude regions.
and this…
The strong and statistically robust connection identified here between the most rapid cloud decreases over mid-latitude regions and short-term changes in the GCR flux is clearly distinguishable from the effects of solar irradiance and IMF variations. The observed anomalous changes show a strong latitudinal symmetry around the equator; alone, this pattern
gives a good indication of an external forcing agent, as
there is no known mode of internal climate variability at the
timescale of analysis, which could account for this distinctive
response. It is also important to note that these anomalous
changes are detected over regions where the quality of
satellite-based cloud retrievals is relatively robust; results of
past studies concerned with high-latitude anomalous cloud
changes have been subject to scrutiny due to a low confidence
in polar cloud retrievals (Laken and Kniveton, 2010;
Todd and Kniveton, 2001) but the same limitations do not
apply here.
Although mid-latitude cloud detections are more robust
than those over high latitudes, Sun and Bradley (2002) identified
a distinctive pattern of high significance between GCRs
and the ISCCP dataset over the Atlantic Ocean that corresponded
to the METEOSAT footprint. This bias does not
appear to influence the results presented in this work: Fig. 6 shows the rates of anomalous IR-detected cloud change occurring over Atlantic, Pacific and land regions of the midlatitudes during the composite period, and a comparable pattern of cloud change is observed over all regions, indicating no significant bias is present.
Conclusions
This work has demonstrated the presence of a small but statistically significant influence of GCRs on Earth’s atmosphere over mid-latitude regions. This effect is present in
both ISCCP satellite data and NCEP/NCAR reanalysis data for at least the last 20 years suggesting that small fluctuations in solar activity may be linked to changes in the Earth’s atmosphere via a relationship between the GCR flux and cloud cover; such a connection may amplify small changes in solar activity. In addition, a GCR – cloud relationship may also act in conjunction with other likely solar – terrestrial relationships concerning variations in solar UV (Haigh, 1996) and total solar irradiance (Meehl et al., 2009). The climatic forcings resulting from such solar – terrestrial links may have had a significant impact on climate prior to the onset of anthropogenic warming, accounting for the presence of solar cycle relationships detectable in palaeoclimatic records (e.g.,Bond et al., 2001; Neff et al., 2001; Mauas et al., 2008).
Further detailed investigation is required to better understand GCR – atmosphere relationships. Specifically, the use of both ground-based and satellite-based cloud/atmospheric monitoring over high-resolution timescales for extended periods of time is required. In addition, information regarding potentially important microphysical properties such as aerosols, cloud droplet size, and atmospheric electricity must also be considered. Through such monitoring efforts, in addition to both computational modelling (such as that of Zhou and Tinsley, 2010) and experimental efforts (such as that of Duplissy et al., 2010) we may hope to better understand the effects described here.
It seems they have found the signal. This is a compelling finding because it now opens a pathway and roadmap on where and how to look. Expect more to come.
The full paper is here: Final Revised Paper (PDF, 2.2 MB)
h/t to The Hockey Schtick
But are you not basing your hypothesis on what has been measured and demonstrated to be temporary ozone affects that you think are cumulative? It is here that I ask you to provide the physical mechanism for a cumulative affect.
In addition, it is the scientist proposing a theory who must go about falisifying their hypothesis, and leave no stone unturned in doing so.
Leif, did you not read this bit ?
“The above results already show that the effects of energetic particle precipitation
on the atmosphere can be of significant importance for the Earth’s atmosphere, perhaps even for the climate. Recent satellite observations have also shown that energetic particle precipitation, combined with atmospheric dynamics, is an important NOx source in the polar winter middle atmosphere. Chemistry-climate models have systematically under-predicted NOx in the polar winter stratosphere, probably because they do not include the downwards transport from the mesosphere. Using the latest information provided for example by the atmospheric chemistry instruments on the Envisat satellitem the results on the energetic particle precipitation impact on the global climate system could be further defined. After all, whatever the effect will turn out to be, it is important for us to be aware of it EVEN IF IT IS NATURAL,NOT MANMADE VARIABILITY.
It would seem that my hypothesis is pretty damned close even if adjustments do have to be made to the precise mechanism.
The step forward that I claim to have made is a description of the atmospheric and climate response to whatever the process is in the upper atmosphere that has yet to be nailed.
If the Haigh data is verified by a confirmation of ozone increases above 45km when the sun is less active then in terms of the climate response I will be home and dry even if I have not precisely identified the upper atmosphere mechanism.
After all. what matters for climate, is the response of the polar vortices (and the consequent latitudinal jetstream positioning) to the solar forcing however induced.
Ulric, that’s an easy one. The amount of variation in any part of the solar wind has no chance of affecting surface temperatures enough to rise above what we know to be the intrinsic variability. In other words, if it does have an affect, its affects is so little you can’t observe it.
For your suggestion to have merit, those changing solar winds have to affect the soup we call our atmosphere from its own magnetic shield all the way to the surface and into the Oceans. Not enough energy to do so in terms of heating it up to the extent we have experienced on the surface. Once again, it is our own oceans and our own atmosphere creating their own changes that are up to the task.
Svalgaard says:
November 27, 2010 at 10:37 am
[…] it will be discussed further when I get to the series on arctic climate.
She was being nice to you. Didn’t say that your stuff was any good. I say it is junk.
Hey, are you cherry picking quote ? here is the bit you didn’t like:
Thank you, this is a very interesting analysis and it will be discussed further when I get to the series on arctic climate.
You think thanksgiving generosity? , here what she said a month ago re:
http://www.vukcevic.talktalk.net/CET&10Be.htm
curryja | October 31, 2010 at 2:11 pm
I’ll flag this to look at later, I’m not all that familiar with this issue but it looks important.
Could it be she found out that that ‘orible’ Dr. S. is being nasty to ‘little vukcevic’, so she’s trying to cheer’im up a bit ?
Both prof. Dr. Curry and prof. Dr. Pratt are ardent supporters of AGW, and I certainly do not hide fact that I do not believe in the CO2 case.
Funny that !
An opposing but plausible mechanized theory for any event is a falsification, as well as opposing maths that leave your theory with many holes or no-affect results. At best, you can come to a stalemate in your proposal. However, if stalemate, then the null hypothesis must remain.
Pamela Gray said:
“But are you not basing your hypothesis on what has been measured and demonstrated to be temporary ozone affects that you think are cumulative? It is here that I ask you to provide the physical mechanism for a cumulative affect.”
The stratosphere and mesosphere both appear to have cooled increasingly over time whilst the sun was more active. Now that the sun is less active they appear to have ceased cooling and may have warmed slightly.
That is measured and demonstrated is it not?
The mechanism is another issue and I am debating with Leif on that aspect. For some reason the stratospheric and mesospheric temperature trends move in the opposite direction to the thermospheric and tropospheric temperature trends both when the sun is active and when it is inactive.
The Haigh data clearly implicates ozone chemistry because it reveals a reversal of sign at about 45km. Below that level a quiet sun provokes ozone depletion, above that level a quiet sun provokes an ozone increase.
That fits my hypothesis (that there must be a reverse sign solar effect somewhere in the climate system) perfectly and was first anticipated by me in November 2009.
I have made certain speculations as to the mechanism. At present Leif does not accept them so in view of Leif’s expertise I accept that some adjustment may be necessary.
Nonetheless I still think that my description of the climate effect of whatever the mechanism is remains correct.
However one cuts it the polar vortices respond very sensitively to solar variability. If you do not agree please feel free to provide an alternative explanation to recent observations.
Why is the polar vortex so negative with a quiet sun when it was very much more positive with an active sun ?
Stephen Wilde says:
November 27, 2010 at 11:01 am
Leif, did you not read this bit ?
Of course I did. All that is well and good.
After all. what matters for climate, is the response of the polar vortices (and the consequent latitudinal jetstream positioning) to the solar forcing however induced.
That is the part that is bad [and that is not in her thesis.
vukcevic says:
November 27, 2010 at 11:12 am
Could it be she found out that that ‘orible’ Dr. S. is being nasty to ‘little vukcevic’, so she’s trying to cheer’im up a bit ?
Looks more like you had pestered her again, or that she just went through her ‘flagged stuff’ list. I think she said earlier that she [too] really didn’t know enough to evaluate your stuff, so it will be interesting to see what she comes up with.
Both prof. Dr. Curry and prof. Dr. Pratt are ardent supporters of AGW, and I certainly do not hide fact that I do not believe in the CO2 case.
What you don’t believe in has no bearing on that your stuff is junk. It is that on its face, regardless of your beliefs.
“An opposing but plausible mechanized theory for any event is a falsification”
Such as ?
Why were the polar vortices positive when the sun was active and now negative with the sun less active ?
I’m a seeker of truth just as you are.
Vukcevic, I’m a woman. Dr. Curry’s response feels like woman-speak to me. I know it well. I think she was in her “open communication in all things science” mode. Doesn’t mean she does not shake her head in disbelief in private. I don’t think you can bank on your interpretation that she agrees with you or that she thinks your thesis is very plausible.
Leif Svalgaard says:
November 27, 2010 at 9:52 am
The correct analysis is to assume no errors. What is reported is the number of ‘clicks’ from the counter. There are no errors on that, you hear 18 clicks, so 18 clicks it is. Or you see 4 sunspots, so 4 it is. If several 10-second intervals give clicks of 15, 18, 20, 19, 18 , 16, … it means that the cosmic ray intensity [going through your counter] varies [not that there are errors]. If you on several days see 4, 3, 7, 2, 0, 6, … spots, it means that there were a different number of spots on the sun, not that there are errors in your count.
Perhaps a real example: the first 48 hours of 2004, the McMurdo counter recorded an average count per hour of 8929. The square root of that is 94. Is that the ‘error’? The 48 individual counts varied a lot less. The standard variation was 27. The average change from hour to hour was 14. The cosmic ray intensity was seemingly rather steady [variations at other stations were similar, so whatever changes there were, were not random counting errors, but simply small changes in the actual cosmic ray intensity].
Well, all I can say is that we do not do it that way in my field. Whatever we count, or is countable, we assume there is an error of the square root of N. Maybe it is the “error” terminology that is the misunderstanding, error in this case means the probability that the distribution sampled by the count might have given a different count than it gave by 1 sigma. The assumption is of Gaussian distributions. Once distributions are not Gaussian, systematic errors have to be estimated/calculated usually using monte carlo simulations.
So yes, the counter counts 18 clicks and this is the probable path reality came up with. But the probability distribution says it might have come out 18+/-4.2 . This gives the significance of the measure, how many sigma it is different than 0, and the “error” band around the measurement.
Now with sunspots of course you have the count that has come up and you are not probing the probability distribution from which sunspots come. It is a different problem.
Going back to the paper under discussion, the neutrons coming in are the beam, they have a distribution which is time dependent but the objective is to see if this distribution is the generator of clouds . The more statistics accumulated the smaller the error in the distribution estimate (bar systematics).
“After all. what matters for climate, is the response of the polar vortices (and the consequent latitudinal jetstream positioning) to the solar forcing however induced.”
That is the part that is bad and that is not in her thesis.”
Please clarify. One liners are not helpful.
Hi Ms. Gray
Thanks for your perspective, it’s always useful to here lady’s point of view.
No I don’t, if you look at the link no resolution is proposed. Actually I was a bit rude about her blog; I probably need to apologise to her.
vukcevic:
I am Sceptical about ‘Skeptics: make your best case’.
It sounds like carefully set up ‘bear trap’ for bunch of so called ‘loonies’, whose ideas, right or wrong, can be quickly deconstructed by the academia’s climate establishment. Reminiscent of the methods (I have experienced) used in some totalitarian regimes: ‘There is a freedom of speech here, tell us what do you think we should or should not be doing’. There was always one ‘foolhardy’ volunteer, later to be ignored forever (if lucky), or often worse.
j.c.
Ok, but this thread is about the science….Well I’m sorry you view it this way. And I would have viewed this as a good opportunity for you to lay out your arguments for serious consideration.
vukcevic:
Dr Curry, Not whishing to be a complete spoil sport (since I am guest in your open house), here is a small token of my visit. . .Contribution by a part-time sceptic
http://www.vukcevic.talktalk.net/NFC1.htm
j.c.
Thank you, this is a very interesting analysis and it will be discussed further when i get to the series on arctic climate.
What do you think, she was overly polite?
A traditional Babylon´s confusion this of different words, speaking through walls, each in its own water tight compartment, talking to a mirror.
Everything is energy which transforms itself and manifests itself in different wavelegths (sizes=dimensions), frequencies, as the simple photocell effect shows it, if correctly interpreted: It is not light that “excites” zinc it is light energy which transforms itself into electricity. At an electric power plant, gravity is transformed into electricity and we use it to obtain, again, work=gravity, in our homes. That “soup of words” is confusing us.
anna v says:
November 27, 2010 at 11:54 am
Now with sunspots of course you have the count that has come up and you are not probing the probability distribution from which sunspots come. It is a different problem.
Going back to the paper under discussion, the neutrons coming in are the beam, they have a distribution which is time dependent but the objective is to see if this distribution is the generator of clouds . The more statistics accumulated the smaller the error in the distribution estimate (bar systematics).
The neutron count is like the sunspot count . It is not drawn from a distribution. The error bar in the problem [and there is an error bar] is within the superposed epoch analysis. In this you have a number of ‘key times’. Each such selects a value [neutron count] that includes both a signal sought and a variable background [or ‘noise’] which can be [and usually is] much larger than your signal. By having enough key times and hence enough samples and assuming that the background is unrelated to the signal, the average background settles down to a constant level and the signal can be extracted. We can model this. Let the observable be a time series Y(t) = B(t) + S(t,i), with unknown background B(t) and a signal S(t,i) that extends over several time steps, ‘i’ from -n through zero to +n. Example: n=3. For a given key time, tk, Y(tk-3) = B(tk-3) + S(-3), … Y(tk) = B(tk) + S(0), …Y(tk+3) = B(tk+3) + S(+3) where the signal is constant in time, i.e. not depending on t, then S(tk1,i) = S(tk2,i) etc, so we can drop reference to tk. Now, you have many tk’s and you sum over them: SUM(Y(tk,i)) = SUM(B(tk,i)) + SUM(S(tk,i)), and compute the averages AVG(Y(tk,i) = AVG(B(tk,i) + AVG(S(tk,i). Under our assumption that B does not depend on i, but only on t, AVG(B(tk,i)) will also not depend on i and be constant [or linear in t which we can get rid of by detrending], and thus AVG(S(i)) = AVG(Y(tk,i)) – const. Since S was assumed not to depend on t, we have extracted the signal S(i) = AVG(Y(tk,i)) – const. The error-bar now depends on the error-bar of AVG(Y(tk,i)) which depends on the number of key dates and the error in the Y-values [if any]. By having enough key times we can make the error-bar as small as we want, or rather, there exists a number, N, of key times for which the combined error is smaller than any number, e, chosen beforehand, since the error in the AVG decreases as 1/SQRT(N). So, the error bar [with enough key times] depends on the number of key times and not on the intrinsic counting or measurement error, and not on the value of the background ‘const’, and hence does not scale with the square root of Y.
Stephen Wilde says:
November 27, 2010 at 11:58 am
“After all. what matters for climate, is the response of the polar vortices (and the consequent latitudinal jetstream positioning) to the solar forcing however induced.”
“That is the part that is bad and that is not in her thesis”
Please clarify. One liners are not helpful.
She explains that In the winter polar middle atmosphere transport is largely determined by the polar vortex. In the winter pole, near the polar night terminator, strong temperature gradients lead to formation of the Polar Night Jet. As shown in Figure 2.4, the Polar Night Jet is a strong eastward (westerly) wind in the upper stratosphere-lower mesosphere near 60◦ N/S latitude, formed due to the thermal wind balance [Solomon, 1999; Holton, 2004]. The winds in the Polar Night Jet, which reach their peak of about 80 m/s near 60 km altitude, act as a transport barrier between polar and mid-latitude air, blocking meridional transport and isolating the air in the polar stratosphere and thus forming the polar vortex. The edge of the vortex is usually near 60◦ N/S and it extends from approximately 16 km to the mesosphere. The isolation is greater, and the polar vortex more stable, in the Antarctic where there is less wave activity affecting the vortex than in the Arctic. In the Arctic, the atmospheric wave activity disturbs the vortex, leading to greater mixing and faster downward motion, compared with those in the Antarctic vortex [Solomon, 1999].”
It is upwards-traveling wave activity from below that controls the polar vortices, not solar activity from above.
vukcevic says:
November 27, 2010 at 12:11 pm
j.c.: Ok, but this thread is about the science….Well I’m sorry you view it this way. And I would have viewed this as a good opportunity for you to lay out your arguments for serious consideration.
This is what I have urging you to do many times, but with me as with her, you missed [or refused] the opportunity to lay out your arguments [over at solarcycle24.com you even said “I will not answer questions about my ideas”]. As you say: “somebody could steal your important work”.
“Leif Svalgaard said:
Stephen Wilde said:
The diffuse aurora, which typically accounts for THREE-QUARTERS of the energy input into the upper atmosphere at night, varies according to the season and the 11-year solar cycle.
Leif said:
That energy is in the form of joule heating and does not produce NOx”
Okaaaay.
Forgive me for asking ,Leif, but if that is so why would Richard Horne propose:
“effects on ozone at high altitude, which may affect temperature right through the atmosphere”
Part of my purpose is to try to resolve the conflicting statements from so called ‘experts’.
“Stephen Wilde says:
November 27, 2010 at 11:58 am
“After all. what matters for climate, is the response of the polar vortices (and the consequent latitudinal jetstream positioning) to the solar forcing however induced.”
“That is the part that is bad and that is not in her thesis”
Please clarify. One liners are not helpful.
She explains that In the winter polar middle atmosphere transport is largely determined by the polar vortex. In the winter pole, near the polar night terminator, strong temperature gradients lead to formation of the Polar Night Jet. As shown in Figure 2.4, the Polar Night Jet is a strong eastward (westerly) wind in the upper stratosphere-lower mesosphere near 60◦ N/S latitude, formed due to the thermal wind balance [Solomon, 1999; Holton, 2004]. The winds in the Polar Night Jet, which reach their peak of about 80 m/s near 60 km altitude, act as a transport barrier between polar and mid-latitude air, blocking meridional transport and isolating the air in the polar stratosphere and thus forming the polar vortex. The edge of the vortex is usually near 60◦ N/S and it extends from approximately 16 km to the mesosphere. The isolation is greater, and the polar vortex more stable, in the Antarctic where there is less wave activity affecting the vortex than in the Arctic. In the Arctic, the atmospheric wave activity disturbs the vortex, leading to greater mixing and faster downward motion, compared with those in the Antarctic vortex [Solomon, 1999].”
It is upwards-traveling wave activity from below that controls the polar vortices, not solar activity from above.”
Right, Leif, I’m with you on that but you haven’t addressed my earlier point.
If more NOx is available for drawdown at a time of more active sun then that must have an effect on the net outcome.
If an active sun creates more NOx (as it must) then as soon as the polar vortex starts to draw NOx down in the winter season it will encounter a more concentrated reservoir of NOx and the ozone in the polar vortex will be depleted according to the concentration of NOx encountered.
More active sun, more NOx, more ozone depletion above 45km, cooler mesosphere and stratosphere, higher tropopause, more poleward jets. Voila.
Less active sun, less NOx, less ozone depletion above 45km, warmer mesosphere and stratosphere, lower tropopause, more equatorward jets, Voila.
@Pamela Gray says:
November 27, 2010 at 11:07 am
“Ulric, that’s an easy one. The amount of variation in any part of the solar wind has no chance of affecting surface temperatures enough to rise above what we know to be the intrinsic variability. In other words, if it does have an affect, its affects is so little you can’t observe it.”
The ” intrinsic variability” is caused by the gross solar variations, that is the effect. Eyeball some peak values and see what they did for surface temp` deviations from normals at the time :-
http://www.solen.info/solar/coronal_holes.html
The correlation is sound, the mechanism may be to do with increased Infra Red driven surface heating.
The more important issue is as to what is driving these solar changes, which is what I work with as a long range weather forecaster.
“For your suggestion to have merit, those changing solar winds have to affect the soup we call our atmosphere from its own magnetic shield all the way to the surface and into the Oceans. Not enough energy to do so in terms of heating it up to the extent we have experienced on the surface. Once again, it is our own oceans and our own atmosphere creating their own changes that are up to the task.”
Internal variation cannot create heating, that makes no sense.
Stephen Wilde says:
November 27, 2010 at 1:44 pm
Forgive me for asking ,Leif, but if that is so why would Richard Thorne propose:
“effects on ozone at high altitude, which may affect temperature right through the atmosphere”
“In the mesosphere and upper stratosphere, ozone loss is caused by H and OH produced as th result of ion-molecule reactions associated with particle induced ionization” From: http://www.leif.org/EOS/1999JD900752.pdf
Part of my purpose is to try to resolve the conflicting statements from so called ‘experts’.
The problem comes from you only reading the part of a paper or report that you want and don’t get the whole picture. Granted, that some papers are hard to penetrate for non-specialists, but that what we have the blog for [“ask away” but don’t fight it then].
Stephen Wilde says:
November 27, 2010 at 2:03 pm
More active sun, more NOx, more ozone depletion above 45km, cooler mesosphere and stratosphere, higher tropopause, more poleward jets. Voila.
Less active sun, less NOx, less ozone depletion above 45km, warmer mesosphere and stratosphere, lower tropopause, more equatorward jets, Voila.
What the mesosphere does [cools or heats] has little effect on the stratosphere as far as ozone is concerned. To change anything you need to change the ozone in the stratosphere: higher solar UV [more active sun] creates more ozone and a warmer stratosphere. This is the basic mechanism, both in the mesosphere and in the stratosphere [interrupted by rare proton events]. From 1979 until about ten years ago there has been a clear decline [~12%] of ozone near 40 km altitude. In the last 10 years there has been no decline, at some stations even an increase, consistent with the decline of stratospheric chlorine. Solar activity has had little [if anything] to do with this.
Mr. Wilde
For some time now I’ve been following polar jet-stream S shape over Canada – North Atlantic
http://squall.sfsu.edu/gif/jetstream_atl_h12_00.gif
and the SST temperature anomaly
http://weather.unisys.com/surface/sst_anom.gif
Note the yellow collared spot of Labrador (marked H)
It appears that two are following each other. H spot is point where surfaces the warm North Atlantic drift current , releasing latent heat into atmosphere, which rises to create Ferrel cell,
http://www.srh.noaa.gov/jetstream//global/images/jetstream3.jpg
moving the jet stream further to the south or north. It moves all the time, depending on the temperature differential between the East Greenland and NA drift currents, forming together Subpolar gyre.
Few weeks ago when UK had a bit or warm spell, the H spot was much further north at the tip of Iceland.
I think it could be useful if you look into these events too.
I wish you success with your research. You can always put it forward to Dr. Judith Curry, on her blog she is inviting sceptic’s contributions.
Thank you for your attention Leif. Two queries as follows:
i) “In the mesosphere and upper stratosphere, ozone loss is caused by H and OH produced as th result of ion-molecule reactions associated with particle induced ionization” From: http://www.leif.org/EOS/1999JD900752.pdf”
The precise reason for ozone loss doesn’t really matter to me. What matters is whether ozone loss is greater when the sun is more active. I take it from you and Richard Horne that that is indeed the case.
ii) “What the mesosphere does [cools or heats] has little effect on the stratosphere as far as ozone is concerned. To change anything you need to change the ozone in the stratosphere: higher solar UV [more active sun] creates more ozone and a warmer stratosphere. This is the basic mechanism, both in the mesosphere and in the stratosphere [interrupted by rare proton events]. From 1979 until about ten years ago there has been a clear decline [~12%] of ozone near 40 km altitude. In the last 10 years there has been no decline, at some stations even an increase, consistent with the decline of stratospheric chlorine. Solar activity has had little [if anything] to do with this.”
I’m aware of the basic mechanism and the proposed chlorine effect but it doesn’t seem to accord with observations. I think the temperature of the mesosphere is relevant in the same way as an increase in downward inclination along part of a river bed will increase the speed of the downward flow all the way from the source.A cooler mesosphere will increase upward energy flux from the stratosphere.
From 1979 to about ten years ago there was indeed a decline in stratospheric temperatures linked to the decline in ozone above 40km. I propose that the decline in ozone was solar induced and not chlorine induced because a more active sun creates a stronger downward NOx flux which causes the mesosphere to cool due to reduced ozone and the stratosphere follows . Also you have said that an enhanced NOx flux affects the stratosphere.
From ten years ago the sun started to decline in activity which resulted in less NOx available to be drawn down into the polar vortex with a consequent ozone recovery.
So I have to decide, as you do, whether the observations fit best the chlorine scenario or the solar scenario.
I elect for the solar scenario because:
i) The jets moved poleward as they must if the stratosphere cools and the tropopause rises. That happened in the MWP when agriculture became possible in Greenland so it cannot be anything to do with CO2 or CFCs.
ii) The observed range of latitudinal jetstream shifting is far greater than the models can reproduce on the basis of the standard mechanism. There has to be another process supplementing the standard mechanism by expanding and shrinking the polar vortex in line with varying levels of solar activity.
iii) No one has ever suggested that the chlorine emissions alone can shift the jetstreams. CO2 is no longer a contender if one accepts that the jets are now moving back equatorward because CO2 continues to rise so the jets should be moving further poleward but they are clearly not.
iv) The Haigh data indicates increasing ozone above 45km between 2004 and 2007 despite (or in my view because of) the less active sun. Such an increase is contrary to expectations.
So for various reasons I cannot accept your bald statement that solar activity has little (if anything) to do with it.
Stephen Wilde says:
November 27, 2010 at 4:07 pm
The precise reason for ozone loss doesn’t really matter to me. What matters is whether ozone loss is greater when the sun is more active. I take it from you and Richard <b<Thorne that that is indeed the case.
I think ozone production is greater with an active sun. More UV etc. Some of that could be lost by particles. What matter must be the net, and as far as I know that is positive.
“From 1979 until about ten years ago there has been a clear decline [~12%] of ozone near 40 km altitude. In the last 10 years there has been no decline, at some stations even an increase, consistent with the decline of stratospheric chlorine.”
Was actually a quote from a recent paper. And also matches my recollection.
From 1979 to about ten years ago there was indeed a decline in stratospheric temperatures linked to the decline in ozone above 40km.
The chlorine only began to decline recently. so some disconnect here.
Also you have said that an enhanced NOx flux affects the stratosphere.
only when the polar vortex sucks it down, so the vortex has already changed.
From ten years ago the sun started to decline in activity which resulted in less NOx available to be drawn down into the polar vortex with a consequent ozone recovery.
solar activity declines to almost zero every eleven years.
The jets moved poleward as they must if the stratosphere cools and the tropopause rises.
I think it is the other way around: the jets control the tropopause, etc. Educate me otherwise with links, refs, etc.
The Haigh data indicates increasing ozone above 45km between 2004 and 2007 despite (or in my view because of) the less active sun. Such an increase is contrary to expectations.
It is Harder’s data, not Haighs. And the current thinking [guess] is that that happens in every solar cycle, but that we only now have discovered it.
So for various reasons I cannot accept your bald statement that solar activity has little (if anything) to do with it.
“bald”?. I am under the [perhaps mistaken] impression that it is a well-considered and reasoned statement…
I think I now have enough information to state an opinion.
Leif, you and others have provided me with a variety of mechanisms whereby a more active sun depletes ozone at the higher levels of the atmosphere for a net cooling effect.
It is well established that in the lower levels of the atmosphere a more active sun increases ozone and UV acts on the ozone present for a net warming effect.
Now we know that the temperature of the stratosphere increases with height up to about 50km due to that warming ozone effect.
However from 50km upwards the temperature of the atmosphere decreases with height due (at least in part) to that ozone depleting cooling effect.
So at or around 50km (the stratopause) one effect segues into the other so that below the stratopause the ozone creation and UV warming effect is dominant but above the stratopause the ozone depletion cooling effect is dominant.
Thus any change in the balance between the two opposing processes will result in a change in the height of the stratopause.
In fact a change in that balance from a change in the level of solar activity will actually result in a change of height at the mesopause, stratopause AND tropopause.
A more active sun appears to deplete ozone and cool the higher layers more than it creates ozone and warms the lower layers for a net cooling of both stratosphere and mesosphere exactly as observed during the late 20th century period of active sun.
Change the height of the tropopause and one changes the pressure distribution below the tropopause with the climate consequences that are becoming obvious.
A more active sun raises the height of the tropopause to deepen the polar vortex but reduce its horizontal extent with more poleward jets.
A less active sun appears to reduce the height of the tropopause for a shallower but more extensive polar vortex with more equatorward jets.
So via that mechanism a change in solar activity from above can alter the global climate below.
Stephen Wilde says:
November 27, 2010 at 4:07 pm
The Haigh data indicates increasing ozone above 45km between 2004 and 2007 despite (or in my view because of) the less active sun. Such an increase is contrary to expectations.
It is Harder’s data, not Haighs. And the current thinking [guess] is that that happens in every solar cycle, but that we only now have discovered it.
In fact, I pointed out some time ago [before Harder and Haigh] that the near UV varies opposite to the solar cycle: http://www.leif.org/research/Erl70.png so perhaps it was not all that unexpected [perhaps just not appreciated].
From Haigh’s SORCE 2010 presentation:
“• SIM data would suggest that solar radiative forcing of climate produced a warming from 2004 to 2007, despite declining TSI.”
This should then happen in every cycle. I do not think [but it is conjecture at this point] that this cycle was special in that respect [no physical mechanism].