New Paper: PETM Was Caused by Climate Change… Ancient Climate Change Caused Climate Change… AEUHHH????

PETM = Paleocene-Eocene Thermal Maximum

Guest Aeuhhh???? by David Middleton

“Ancient climate change triggered warming that lasted thousands of years”…

Climate change caused climate change???

Ancient climate change triggered warming that lasted thousands of years

Matthew Carroll
January 21, 2019
UNIVERSITY PARK, Pa. — A rapid rise in temperature on ancient Earth triggered a climate response that may have prolonged the warming for many thousands of years, according to scientists.

Their study, published online in Nature Geoscience, provides new evidence of a climate feedback that could explain the long duration of the Paleocene-Eocene Thermal Maximum (PETM), which is considered the best analogue for modern climate change.

The findings also suggest that climate change today could have long-lasting impacts on global temperature even if humans are able to curb greenhouse gas emissions.

“We found evidence for a feedback that occurs with rapid warming that can release even more carbon dioxide into the atmosphere,” said Shelby Lyons, a doctoral student in geosciences at Penn State. “This feedback may have extended the PETM climate event for tens or hundreds of thousands of years. We hypothesize this is also something that could occur in the future.”

Increased erosion during the PETM, approximately 56 million years ago, freed large amounts of fossil carbon stored in rocks and released enough carbon dioxide, a greenhouse gas, into the atmosphere to impact temperatures long term, researchers said.

[…]

Global temperatures increased by about 9 to 14.4 degrees Fahrenheit during the PETM, radically changing conditions on Earth. Severe storms and flooding became more common, and the warm, wet weather led to increased erosion of rocks.

[…]

Lyons was studying PETM core samples from Maryland, in a location that was once underwater, when she discovered traces of older carbon that must have once been stored in rocks on land. She initially believed the samples were contaminated, but she found similar evidence in sediments from other Mid-Atlantic sites and Tanzania.

Carbon in these samples did not share common isotope patterns of life from the PETM and appeared oily, as if it been heated over long periods of time in a different location.

“That told us what we were looking at in the records was not just material that was formed during the PETM,” Lyons said. “It was not just carbon that had been formed and deposited at that time, but likely represented something older being transported in.”

[…]

They estimated the climate feedback could have released enough carbon dioxide to explain the roughly 200,000-year duration of the PETM, something that has not been well understood.

[…]

Penn State News

This actually looks like some really good science turned into press release psychobabble.  So, first, I will ridicule the press release.

Press Release Psychobabble

Only a delusional alarmist half-wit would describe the PETM as any sort of “analogue for modern climate change”, much less the “best” analog (which does not end with -ue on this side of the Atlantic Ocean, except maybe in Canada).

 

Cenozoic_CO2

Cenozoic_CO2_leg
Figure 1.  Cenozoic CO2 atmospheric mixing ratio and seawater partial pressure.  Notice the huge difference between atmospheric CO2 and pCO2.  Also notice that pCO2 was higher before and after the PETM and that stomata data indicate that CO2 was about what it is today, apart from a short duration spike to about 800 ppmv 55.2 Mya.  Talk about settled science! Note: Older is to the right.  Tirpati should be Tripati.

Note how the PETM (55 Ma) is about as far from a CO2 analog to modern times as it possibly could be… unless the PETM stomata data are correct, in which case AGW is even more insignificant than previously thought.

Regarding temperatures, the PETM is also about as far from being an analog to modern times as it possibly could be.

Figure 2.  High latitude SST (°C) From benthic foram δ18O.  Funny how the PETM is often cited as a nightmarish version of a real-world RCP8.5… While the warmer EECO is a climatic optimum. (Zachos et al., 2001). Note: Older is to the right.

Note that the Early Eocene Climatic Optimum (EECO) was just as warm as the PETM and lasted longer.

To demonstrate how utterly ridiculous it is to describe the PETM as an analog for modern climate change, we just have to look at the Miocene Epoch, which was much cooler than the PETM and EECO.

Figure 3. High latitude SST (°C) From benthic foram δ18O (Zachos, et al., 2001) and HadSST3 ( Hadley Centre / UEA CRU via www.woodfortrees.org) plotted at same scale, tied at 1950 AD.  Note: older is to the left.

Bear in mind that the HadSST3 data are of much higher resolution than the δ18O time series.  The amplitude of the proxy time series on multi-decadal to centennial time-scales should be considered to be the minimum of the true variability on those time-scales, due to the much lower resolution than the instrumental data (Ljungqvist, F.C. 2010).  Despite this, the modern ~1 °C rise since pre-industrial times doesn’t even break out of the Pleistocene noise level… another 1 °C rise won’t even break out of the Pleistocene noise level.

The PETM is also often cited as an analog for Chicken Little of the Sea

 

Cenozoic_pH
Figure 4.  Cenozoic seawater pH from boron isotopes in planktonic foraminifera (modified after Pearson & Palmer, 2000). Note that pH was lower than the PETM 51.5 (EECO) and 59.5 Ma. Note: Older is to the right.  As with temperatures, the amplitude of the proxy time series on multi-decadal to centennial time-scales should be considered to be the minimum of the true variability on those time-scales, due to the much lower resolution than the instrumental data.

I literally couldn’t make this sort of schist up if I was trying.

Some Really Good Science

Palaeocene–Eocene Thermal Maximum prolonged by fossil carbon oxidation

Abstract

A hallmark of the rapid and massive release of carbon during the Palaeocene–Eocene Thermal Maximum is the global negative carbon isotope excursion. The delayed recovery of the carbon isotope excursion, however, indicates that CO2 inputs continued well after the initial rapid onset, although there is no consensus about the source of this secondary carbon. Here we suggest this secondary input might have derived partly from the oxidation of remobilized sedimentary fossil carbon. We measured the biomarker indicators of thermal maturation in shelf records from the US Mid-Atlantic coast, constructed biomarker mixing models to constrain the amount of fossil carbon in US Mid-Atlantic and Tanzania coastal records, estimated the fossil carbon accumulation rate in coastal sediments and determined the range of global CO2 release from fossil carbon reservoirs. This work provides evidence for an order of magnitude increase in fossil carbon delivery to the oceans that began ~10–20 kyr after the event onset and demonstrates that the oxidation of remobilized fossil carbon released between 102 and 104 PgC as CO2 during the body of the Palaeocene–Eocene Thermal Maximum. The estimated mass is sufficient to have sustained the elevated atmospheric CO2 levels required by the prolonged global carbon isotope excursion. Even after considering uncertainties in the sedimentation rates, these results indicate that the enhanced erosion, mobilization and oxidation of ancient sedimentary carbon contributed to the delayed recovery of the climate system for many thousands of years.

Nature Geoscience

Some Really Good Science Is Behind a Pay-wall

Which is unfortunate, because it might just explain the Paleocene-Eocene carbon isotope excursion.

Figure 5. Figure 3. Cenozoic  δ13C (Zachos, et al., 2001)

Although the prolonged carbon isotope excursion actually occurred after the PETM, during the EECO. Isn’t it “funny”? Prior to ExxonMobil, carbon isotope excursions (depletion of δ13C) routinely accompanied periods of warming. Since ExxonMobil, carbon isotope excursions have been caused by fossil fuel combustion. Maybe climate “scientists” should adopt a new dating system… Instead of years BP, they should use years BXOM (before ExxonMobil)… That even made Mr. Data laugh!

References

 

Ljungqvist, F.C. 2010. A new reconstruction of temperature variability in the extra-tropical Northern Hemisphere during the last two millennia. Geografiska Annaler: Physical Geography, Vol. 92 A(3), pp. 339-351, September 2010. DOI: 10.1111/j.1468-459.2010.00399.x

Lyons, Shelby L. & Baczynski, Allison & Babila, Tali & J. Bralower, Timothy & A. Hajek, Elizabeth & Kump, Lee & G. Polites, Ellen & Self-Trail, Jean & M. Trampush, Sheila & R. Vornlocher, Jamie & Zachos, J.C. & Freeman, Katherine. (2018). Palaeocene–Eocene Thermal Maximum prolonged by fossil carbon oxidation. Nature Geoscience. 12. 10.1038/s41561-018-0277-3.

Middleton, David H.  The Total Myth of Ocean Acidification, Part Deux: The Scientific Basis. WUWT. 2018

Middleton, David H.  No. The Miocene is not an example of the “last time it was as warm as it’s going to get later this century”… Argh!. WUWT. 2018

Pagani, M., J.C. Zachos, K.H. Freeman, B. Tipple, and S. Bohaty. 2005. Marked Decline in Atmospheric Carbon Dioxide Concentrations During the Paleogene. Science, Vol. 309, pp. 600-603, 22 July 2005.

Pearson, P. N. and Palmer, M. R.: Atmospheric carbon dioxide concentrations over the past 60 million years, Nature, 406, 695–699,https://doi.org/10.1038/35021000, 2000.

Royer, et al., 2001. Paleobotanical Evidence for Near Present-Day Levels of Atmospheric CO2 During Part of the Tertiary. Science 22 June 2001: 2310-2313. DOI:10.112

Tripati, A.K., C.D. Roberts, and R.A. Eagle. 2009.  Coupling of CO2 and Ice Sheet Stability Over Major Climate Transitions of the Last 20 Million Years.  Science, Vol. 326, pp. 1394 1397, 4 December 2009.  DOI: 10.1126/science.1178296

Zachos, J. C., Pagani, M., Sloan, L. C., Thomas, E. & Billups, K. Trends, rhythms, and aberrations in global climate 65 Ma to present. Science 292, 686–-693 (2001).

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James Schrumpf
January 23, 2019 12:22 pm

I’ve been saying this for months now: people use “climate change” like it was a force of nature, rather than the result of long-term weather shifts.

“Like saying wet sidewalks caused the rain,” is my favorite analogy..

Craig from Oz
Reply to  James Schrumpf
January 23, 2019 3:18 pm

“Like it was a force of nature”?

No! It’s Mann Made. 97% of Everyone knows that.

Thomas Ryan
Reply to  Craig from Oz
January 23, 2019 5:55 pm

Climate change destroyed my homework. Really. No lie.

Hivemind
Reply to  James Schrumpf
January 23, 2019 5:54 pm

The American slaves used to believe that the tree branches waving back and forth cause the wind.

R Shearer
Reply to  Hivemind
January 23, 2019 8:40 pm

Really? This is documented?

Phoenix44
Reply to  Hivemind
January 24, 2019 1:48 am

The ancient Greeks used to think wind was caused by supernatural beings…We know waving leaves around creates “wind” so the slaves were pretty sensible really.

Reply to  James Schrumpf
January 23, 2019 8:05 pm

James – it’s even more basic than that.

It’s “Climate Change Caused Climate Change.”

Think of it as “Wet sidewalks caused wet sidewalks” and “The rain caused the rain.”

Got it? Glad we cleared that up.

Johann Wundersamer
Reply to  ALLAN MACRAE
January 24, 2019 10:00 am

ALLAN, the devil’s circles reasonings go

CO2 caused catastrophic man made climate change

caused CO2

caused catastrophic man made climate change

caused CO2

caused catastrophic man made climate change

caused CO2

caused catastrophic man made climate change et cetera pp. ad nauseam

to circle reasoning and no way out, green belivers!

– that comes from the midst of society. –

live with it.

Joel O'Bryan
January 23, 2019 12:33 pm

The climate hustle very much depends on a narrow limited exploitation of available data to the public.
Any understanding of the larger context of the claims or of the propaganda completely destroys the gas-ligthing” attempts.

On a very short time scale (days instead of decades) the Covington Catholic Boy’s incident last weekend is a vivid example of this type of “lack of broader context” exploit used by manipulators.

The initial Covington incident “the video doesn’t lie” deception disseminated by BuzzFeed and CNN to trigger the outrage was a narrowly focused video, without any larger context to judge what was actually happening or had happened. Of course the mass outrage followed, just as the manipulators hoped for. And they played on existing stereotype bias by focusing on some of the teenage boys wearing MAGA baseball caps — triggering TDS episode in many viewers. They made other deceptive claims like the the Indian Chief was Vietname War veteran (he was in the USMC from 1972-1976 but not go to Vietnam) to play on sympathies for combat war veterans.

When the much longer (time wise) videos quickly surface, with broader views of all the players there, the conclusions quickly reversed 180 degrees. The manipulators were exposed. But make no mistake, this same sort of manipulation is used in furthering the climate hustlers’ climate alarmism, only on a time scale of decades.

With proper perspective as David Middleton shows here on PETM claims as a modern day climate analogue for our CO2 emissions, their claims fall apart on consideration of the broader context and evidence of Earth’s past climates on all time scales.

troe
January 23, 2019 12:40 pm

“suggests” is that science or something else?

Penn State (Michael Mann is a denizen I believe) is a cesspool of political science paid for by at least one guy who made his fortune in the oil business but became a climate crusader.

science bought by the pound leads to headlines for the gullible

joe
Reply to  David Middleton
January 24, 2019 1:45 am

Yep agree, DHIs are not proof that oil or gas deposits exist. Where I once worked they were called dry hole indicators after our third dry hole in a row!

ATheoK
January 23, 2019 12:40 pm

“Lyons was studying PETM core samples from Maryland, in a location that was once underwater, when she discovered traces of older carbon that must have once been stored in rocks on land. She initially believed the samples were contaminated, but she found similar evidence in sediments from other Mid-Atlantic sites and Tanzania.

Carbon in these samples did not share common isotope patterns of life from the PETM and appeared oily, as if it been heated over long periods of time in a different location.

That told us what we were looking at in the records was not just material that was formed during the PETM,” Lyons said. “It was not just carbon that had been formed and deposited at that time, but likely represented something older being transported in.”

Do some research, jump to assumptions and conclusions to set the stage, allowing the researcher to reach conclusions based on confirmation bias.

“The delayed recovery of the carbon isotope excursion, however, indicates that CO2 inputs continued well after the initial rapid onset, although there is no consensus about the source of this secondary carbon. Here we suggest this secondary input might have derived partly from the oxidation of remobilized sedimentary fossil carbon. We measured the biomarker indicators of thermal maturation in shelf records from the US Mid-Atlantic coast, constructed biomarker mixing models

Good science?

Joel O'Bryan
Reply to  David Middleton
January 23, 2019 1:32 pm

A pay-wall does not imply “good science” though. Not by a long ways.

It is just part of a business model for legacy journals in order to pay the editors and staff and keep the lights on.

Caligula Jones
Reply to  David Middleton
January 23, 2019 1:39 pm

“The “good science” is behind the pay-wall.”

So…if we are told that climate change is the “new” WW III…shouldn’t all this good stuff be dissiminated widely? For free?

I mean, if someone had evidence about Dachau in the early 30s but you had to pay $8.99 for it, kinda makes you wonder…

R Shearer
Reply to  Caligula Jones
January 23, 2019 8:41 pm

So maybe SciHub will prevent WWIII.

Susan
Reply to  ATheoK
January 23, 2019 1:30 pm

I hope ‘appeared oily’ was the journalist and not the scientist.

donb
Reply to  ATheoK
January 23, 2019 5:22 pm

@ATK
Might explain the following high 13C/12C.

Tom Halla
January 23, 2019 12:41 pm

It also looks very much as if the researchers were trying really, really hard to attribute temperature to CO2 levels primarily.

Anthony Banton
January 23, 2019 1:06 pm

“Some Really Good Science Is Behind a Pay-wall”

I though this facility was common knowledge David.
Seems not …..

http://sci-hub.tw/10.1038/s41561-018-0277-3

sycomputing
Reply to  David Middleton
January 23, 2019 1:24 pm

In my opinion, it is theft.

Ah, so the authors get a cut of the fee then? It’s not just to the aggregators?

sycomputing
Reply to  David Middleton
January 23, 2019 4:04 pm

Enlightening . . .

Greg F
Reply to  David Middleton
January 23, 2019 8:16 pm

I do not use Sci Hub. In my opinion, it is theft.

The press release says:

The National Science Foundation provided funding for this research.

The National Science Foundation is funded by the taxpayers. Seems to me that if the taxpayers are paying for this they should not have to pay again to see the results of the research. IMO, this is also theft.

R Shearer
Reply to  Greg F
January 23, 2019 8:46 pm

Sci Hub has been sued and has paid settlements in the millions. Besides theft, they in essence are providing another revenue stream and disrupting the industry as technology tends to do.

Admin
January 23, 2019 1:10 pm

Well done David, and thank you.

Joel O'Bryan
Reply to  David Middleton
January 23, 2019 1:42 pm

David,
And you owe Brent Spiner and Paramount Pictures (franchise owners) some royalties with how often you have to use LtCmdr Data laughing hysterically with the endless parade of climate change claim absurdities you highlight for our entertainment here at WUWT … 🙂

Hivemind
Reply to  Joel O'Bryan
January 23, 2019 5:59 pm

There are provisions in the copyright acts of various countries which would probably allow this sort of limited use.

John Endicott
Reply to  Hivemind
January 24, 2019 8:01 am

I believe joel’s tongue in cheek comment was indicating that the use isn’t so limited when it’s use is so frequent. In short he wasn’t seriously suggesting royalties owed do much as he was humorously pointing out how frequently absurdities in need of highlighting are in so-called climate science.

Lucius von Steinkaninchen
January 23, 2019 1:30 pm

Not so surprising, “climate change” is a like an angry god for those folks, and medieval philosophers like St. Thomas Aquinas said that God is “the first cause not caused”. =)

January 23, 2019 1:33 pm

But we were told that the PPM of CO2 was so low as to almost prevent the growth of plants.

MJE

John Tillman
Reply to  Michael
January 23, 2019 2:00 pm

During the PETM, plants had plenty of CO2. During glacial phases of the Pleistocene, plant food levels in the air did get dangerously low, ie c. 180 ppm.

Gunga Din
January 23, 2019 1:41 pm

So now we know.
It was Fred’s and Barney’s SUVs that started it all.

Chris Hanley
January 23, 2019 2:52 pm

“Global temperatures increased by about 9 to 14.4 degrees Fahrenheit during the PETM …”.
==========================================
The PETM temperature spike in Arctic SST looks only about 2C which according to, ahem Wiki, was caused by a “massive carbon injection” of 2000 – 7000 GtC compared to human emissions of ~550 GtC since 1870.

tty
Reply to  Chris Hanley
January 24, 2019 8:59 am

We actually have no idea how much carbon was involved, since we do not know the origin and isotopic signature of the extra carbon. With this new theory I make it at least nine different mechanisms have been suggested:

1. Cometary impact
2. Direct volcanism (the North Atlantic Magmatic Province)
3. Bake-out of organics from sediments by the North Atlantic Magmatic Province
4. Large-scale peat fires
5. Oxidation of uplifted organics-rich sediment (the North Atlantic Magmatic Province again)
6. Large-scale melting of permafrost in inland Antarctica
7. Methane hydrate dissolution (either by warmer seas or the good ol’ North Atlantic Magmatic Province)
8. Large scale ocean turn-over
9. Oxidation of fossil coal through increased erosion

Each of these would yield different results as to the amount of carbon involved, and if more than one mechanism was involved you could get just about any result you want.

Marcus
January 23, 2019 3:05 pm

David,

“Only a delusional alarmist half-wit would describe the PETM (as)? any sort of “analogue for modern climate change”

Great job, as always… : )

Marcus
Reply to  David Middleton
January 23, 2019 3:31 pm

Rotflmao…. : )

Marcus
January 23, 2019 3:12 pm

David,

“Although the prolonged carbon isotope excursion actually occurred after the PETM, during the EECO. Isn’t it “funny”? Prior to ExxonMobil, carbon isotope excursions (depletion of δ13C) routinel (routinely?) accompanied periods of warming.

Still a great post… lol

Marcus
Reply to  David Middleton
January 23, 2019 4:01 pm

Funny thing, that is the exact icon I use for my picture on FaceBook ! …..D’OH !

TDBraun
January 23, 2019 4:29 pm

Again, I object to your name-calling the PR writer as “a delusional alarmist half-wit…” You do this in many of your “ridicule” essays. Better to ridicule the PR, not the person.
Every time you do this it wins you no points with anyone except the choir to whom you are preaching. It is counter-productive.

Rich Davis
Reply to  TDBraun
January 23, 2019 6:00 pm

If the PR is delusional, alarmist, and half-witted, how does that not reflect on the writer? Spare us!

Hivemind
Reply to  TDBraun
January 23, 2019 6:03 pm

If you stand up in the foxhole, you should expect your head to be shot off. Anybody writing warmist PR is in the middle of the war and deserves everything they get.

Marcus
Reply to  TDBraun
January 23, 2019 6:25 pm

Well, if the “PR writer” acts like a “delusional alarmist half-wit”, then they probably deserve to be ridiculed as a “delusional alarmist half-wit”……D’OH !

Chaamjamal
January 23, 2019 6:04 pm

I guess there could have been a precursor race of human like reptiles burning fossil fuels that got wiped out by their emission folly and that is our fate as well. Is that it?

https://tambonthongchai.com/2018/10/28/petm/

Len Werner
January 23, 2019 6:10 pm

David, maybe you could answer this for me. I’ve mapped rocks in glaciated country a lot, St. Elias Mtns and Juneau Icefields–and always noticed the pink algae that grows on snow every summer. I also got quite good at making my own wine, and am well aware that bacteria (yeast) eats sugars and ‘farts CO2’. I also remember when in grad studies (mid 70’s) taking the monthly-meeting lecturer to dinner who was on the first Alvin dive, before his GAC talk, and learning of the life growing in extremes at black smokers; it is now apparent that bacteria can survive at low-temperature extremes also.

So if bacteria existed with algae buried in ice, what can CO2 measurements from ice cores be worth? Aren’t such numbers contaminated by unknown factors?

Len Werner
Reply to  David Middleton
January 23, 2019 7:32 pm

“…not in Antarctica and Central Greenland…”–Why not? Is there convincing evidence that there was no bacteria or algae around to have been included with the depositing snow? I ask because I’ve seen the algae everywhere that I’ve seen depositing snow, and I’ve not found any reason to not assume it was there at any time that Antarctic or Greenland ice was forming. And not constant, either; it is logical to assume that food and bacteria were there at varying rates, and with no trace left to find–other than a contribution to CO2 content of the ice. I would like some evidence to put my mind at ease, that there was positively no possible contribution by bacterial action to CO2 in Antarctic or Greenland ice. If it is an assumption–then can the data be meaningless? There seems to be a lot of scientific conclusion hanging on that “Probably not”.

Len Werner
Reply to  David Middleton
January 24, 2019 9:13 am

Okay, I understand the data being used–we have nothing better–but it seems that the possible contamination from bacteria will be ignored until someone proves either that it was or wasn’t there. We have a lot of science, and “science”, hanging on thinking we KNOW from those cores what atmospheric CO2 levels were in the past. I’ll leave it be for now, but I admit I’m just not sure.

This is where I worked over 40 years ago (a GSC project), and the algae, and I’m sure pollen and the bacteria, was there by late summer every year; in my estimation this country is still in the Fraser Glaciation, it hasn’t ended there yet. It gives me cause to marvel that the Cheam Peaks up the Fraser Valley from my home here stuck out of ice like this only 13,000 years ago. 99.8% of the ice that was in western Canada 13,000 years ago has already melted, and we’re running around in circles because that last 0.2% is melting??

https://www.alamy.com/stock-photo-aerial-view-of-juneau-ice-field-bathed-in-evening-light-looking-past-36193405.html?pv=1&stamp=2&imageid=E4B1B4A7-9307-4C8A-9D0E-3D943704E62A&p=228411&n=0&orientation=0&pn=1&searchtype=0&IsFromSearch=1&srch=foo%3dbar%26st%3d0%26pn%3d1%26ps%3d100%26sortby%3d2%26resultview%3dsortbyPopular%26npgs%3d0%26qt%3djuneau%2520ice%2520field%26qt_raw%3djuneau%2520ice%2520field%26lic%3d3%26mr%3d0%26pr%3d0%26ot%3d0%26creative%3d%26ag%3d0%26hc%3d0%26pc%3d%26blackwhite%3d%26cutout%3d%26tbar%3d1%26et%3d0x000000000000000000000%26vp%3d0%26loc%3d0%26imgt%3d0%26dtfr%3d%26dtto%3d%26size%3d0xFF%26archive%3d1%26groupid%3d%26pseudoid%3d%26a%3d%26cdid%3d%26cdsrt%3d%26name%3d%26qn%3d%26apalib%3d%26apalic%3d%26lightbox%3d%26gname%3d%26gtype%3d%26xstx%3d0%26simid%3d%26saveQry%3d%26editorial%3d1%26nu%3d%26t%3d%26edoptin%3d%26customgeoip%3d%26cap%3d1%26cbstore%3d1%26vd%3d0%26lb%3d%26fi%3d2%26edrf%3d%26ispremium%3d1%26flip%3d0%26pl%3d

Alan Tomalty
January 23, 2019 9:32 pm

This is starting to really piss me off. These climate scientists read this blog and they understand how we skeptics destroy every paper they bring out. They are getting better at hiding everything in their reports. At first I thought that this was a 1st rate study because of the use of actual proxy data. However witness the following from the study.

” CO2 budgets during sediment transport will be improved by future studies that better constrain CO2 drawdown from changes in terrestrial biosphere C burial. Using available data and modelled total CO2 release scenarios from fossil C oxidation over the PETM body,”

The above says 3 things to me. 1) They have no idea how much net CO2 was in the atmosphere and the different proxy studies prove that. 2) They have no idea of the magnitude of exchange of CO2 between the atmosphere and terrestrial surface. 3) They admitted that they used a computer model to calculate CO2 release scenariosbut there was no further explanation of this.

Again from the study:

“Additionally, although carbon remobilization can be a CO2 source when fossil C is oxidized,
transport systems also remove CO2 when biosphere carbon is buried and removed from the active carbon cycle. This study does not address how the PETM perturbations might have shifted the
relative balance of these processes, but it does demonstrate that the intensity and timescales on which erosion and transport systems both release and drawdown CO2 are critical to our understanding of carbon cycling during the PETM.”

So in effect they are admitting that the study was useless because they parameterized equations for release of CO2 and then used computer models with many assumptions and did not even attempt to look at the drawdown of CO2 from the atmosphere.

tty
January 24, 2019 8:44 am

This is a quite peculiar theory, since the ”party line” is that increased erosion will draw down CO2, not increase it. Indeed the “party line” explanation for the shift to icehouse climate at the end of the Eocene is that it was due to CO2 drawdown caused by increased erosion of the rising Himalayas. So apparently erosion had opposite effects at the beginning and the end of the Eocene.
It is however an elegant solution to the biggest problem with using the PETM as a prime scare object, the fact that the heating started several thousand years before the coal isotope excursion that is supposed to prove that CO2 was the culprit.

By introducing a second completely different CO2 source that only comes into play well into the PETM, the original warming can be quietly ignored or assigned to some mechanism that produces CO2 without the biological isotope signature (e g cometary impact).

Another problem with this theory is that for it to work, the amount of fossil coal that is oxidized on the way from erosion site to continental shelf must be considerably larger than the amount of carbon of recent biological origin being carried and buried at the same time, which seems highly unlikely.

wadelightly
January 28, 2019 12:48 pm

It is really sad that they get away with this garbage. Yes, you guys do a great job of beating them back, but there does not seem to be any downside to the liars making the idiotic claims.

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