Guest essay by Kip Hansen, St Thomas, USVI
The Claim:
Even if research shows that Hurricane Sandy was not “caused” by Global Warming, it is certain that sea level rise caused by anthropogenic global warming increased the resultant destruction from Sandy’s storm surge.
Example:
“ … sea levels continue to rise due to global warming. The picture here is very clear. And that means that every single hurricane that hits land will push seawater farther inland when it does so. Or as one scientist told me in the wake of Sandy, “There is 100 percent certainty that sea level rise made this worse. Period.” “ (footnote 1)
“Climate Change Made Sandy Worse. Period.” (footnote 7)
Background:
From the New York State Sea Level Rise Task Force Report to the Legislature (2010) — “Sea Level Rise–Causes and Projections : Local sea levels are affected by ocean currents, gravitational forces, prevailing winds, and rise and fall of the land mass. Within the coastal regions of New York State, the land mass is slowly sinking, with the exception of the Hudson estuary north of Kingston. This movement is a result of geological forces and impacts of human activity and development. It affects local, or relative, rates of sea level rise. “
“These projections are supported by empirical data documenting recent sea level rise in New York State. For example, gauges at the New York City Battery indicate that sea level in the 2000s is 4 to 6 inches higher than in the early 1960s” (footnote 8)
“Storm surge in the NYC–LI area can result from tropical storms and extratropical cycles. Hurricanes have directly hit NYC (Scileppi and Donnelly 2007), such as on 3 September 1821 (Ludlum 1963) and 25 August 1893 (National Hurricane Center 2008). The category-3 ( ; 110 kt; 1 kt ’ 0.5 m s 2 1 ) winds during the 1821 event flooded a large portion of southern Manhattan (Ludlum 1963), but at that time the NYC population was only ; 150 000. There have been no other direct hits by major hurricanes (greater than category 2) across NYC–LI since the 1938 ‘‘Long Island Express’’ (National Hurricane Center 2008). Hurricane Gloria (1985) was originally labeled as category 3 at landfall for Long Island but has since been reanalyzed as category 1 (C. Landsea 2008, personal communication). However, it is only a matter of time before another major hurricane will impact the NYC–LI area. “ (This statement proved to be prophetic – Hurricane Sandy hit NJ/NY on 29 October 2012)
“Sea level along New York’s coast has been rising at the rate of almost one foot per century for at least 100 years” (footnote 3)
(footnote 2 – the above four quotes are all from NYS Sea Level Risk Task Force Report to the Legislature 2010)
“The mean sea level trend [at the Battery, Manhattan Island, NY] is 2.77 millimeters/year with a 95% confidence interval of +/- 0.09 mm/yr based on monthly mean sea level data from 1856 to 2006 which is equivalent to a change of 0.91 feet in 100 years.” (footnote 6)
The following NOAA graphic shows the current trend of sea level rise for the Battery at 0-3 mm/yr, based on this same tide gauge.
This is in agreement with the Battery’s tide gauge long-term trend of 2.77 mm/yr both by data from NOAA and from Leatherman 1995.
Overall Global Sea Level Rise (Douglas 1991) gives 1.8 mm/yr for the 100 year trend, 1880 – 1980, based on Tide Gauges. This figure is generally accepted throughout the field, for example, Church and White found 1.7 mm/yr for 1870 – 2004 (footnote 5) [one sees figures ranging from 1.45 mm/yr to 1.8 mm/yr (1870-2004) based on tide gauges, and 2.9 to 3.4 mm/yr, based on the still short satellite data series (1993-2003)]. (footnote 11)
We can now look back now to the causes section of the NYS Sea Level Rise Task Force Report which told us that one factor in sea level change is “rise and fall of the land mass” – which refers both to normal subsidence (in which land sinks for some immediate cause – such as settling of coastal areas created by fill as has been reported recently in Norfolk, VA) and to Glacial Isostatic Adjustment (GIA), which is “Post-glacial rebound (sometimes called continental rebound, glacial isostasy, glacial isostatic adjustment) … the rise of land masses that were depressed by the huge weight of ice sheets during the last glacial period” (footnote 9).
The NYSSLRTF Report quoted above stated clearly that “Within the coastal regions of New York State, the land mass is slowly sinking”. But by how much? In his seminal 2007 paper on North American Glacial Isostatic Adjustment, which was based on GPS data, Giovanni Sella states “The uplift rates generally decrease with distance from Hudson Bay and change to subsidence (1 – 2 mm/yr) south of the Great Lakes. “ (footnote 4) In plain English, the coastal areas of New York, including NY City, much of coastal New England and areas to the south are sinking at a rate ranging from 1 to 2 mm/yr due to the effects of GIA. To be clear here, while GIA normally refers to land masses rising, in the area concerned, coastal NY, GIA has caused the local land mass to subside or sink.
Assumptions for Analysis:
None of the numbers — facts and figures — contained in the quotes above are controversial — they represent the mainstream views on sea level rise and GIA subsidence, both qualitatively and quantitatively, in the area of concern, New York State, and certainly apply to New York City and surrounds as affected by Hurricane Sandy.
All quoted figures are referenced in footnotes (linked directly to source materials where possible) and come from open source (non-pay-walled) peer-reviewed journal papers and government agency web sites.
I take it as a given that, for the purposes of this discussion, we can all agree that sea level change is an entirely LOCAL issue. Hurricane Sandy’s storm surge and resulting damages therefrom depend ONLY on local sea levels relative to local land mass. NY City’s tunnels were not flooded by any putative sea level rise in Sydney, Australia or the South Sea Islands. (There is another discussion about Global Sea Levels, but this is not it.)
This is a common sense, rough-estimate hypothesis-testing exercise, not a proof of anything – so we only need reasonably accurate and readily agreed upon approximations. Therefore, for our “back of the envelope” calculations, I will use the following:
a) Time period = 50 years (1960-2010) – because this is the time period used by the NY State SLR Task Force (footnote 2)
b) For relative sea level rise in NY City, I will use NYSSLRTF 2010’s “4 to 6 inches higher than in the early 1960s”. (footnote 2) This is the same (+/-) as the tide gauge data from NOAA for the Battery, Manhattan Island, NY. It is the longest tide gauge time series in the US — beginning in 1856 and running to the present day. (footnote 6) (footnote 10)
c) For Global sea level rise, I will use Church and White’s 1.7 mm/yr as it covers 1870 – 2004 (Douglas 1991 found 1.8 mm/yr for 1880- 1980). (footnote 5)
d) For subsidence at NY City, I will use the mean of 1.5 mm/yr but give as range extremes both 1 and 2 mm/yr. (footnote 4)
The following section gives the elementary school level mathematics (addition, subtraction, multiplication, and division only – no statistical methods or analysis).
Calculations:
Start with NYSSLRTF’s “at the New York City Battery indicate that sea level in the 2000s is 4 to 6 inches higher than in the early 1960s.” As our other numerical quantities are all in millimeters, as is common in science, we will use these numbers: 4 inches = 101.6 mm (let’s use 100 for ease…it changes nothing). 6 inches = 152.4 mm (let’s use 150, same reason) , the mean is 5 inches which is 127 mm (we’ll use 125). Note that this is well within keeping with NOAAs trend of 2.77 mm/yr for the entire length of the Battery’s tide gauge record.
NYSSLRTF’s stated sea level change at the Battery, 1960-2010, is in mm:
plus 125 mm. (mean of 100 to 150). Note that this is approximately 2.5 mm/yr over the 50 year period. If we were to increase this figure to 138 mm, it would agree precisely with NOAAs 2.77 mm/yr—instead we use the figures from the NYSSLRTF Report for consistency.
For subsidence take 1.5 mm/year (halfway between 1 and 2 mm/yr) times 50 years == 75 mm or 2.95 inches of subsidence. This number has a negative sign, as it is land sinking (as opposed to the sea rising). The Battery has apparently sunk approximately 3 inches since the 1960s.
As the New York State Sea Level Rise Task Force has estimated that “sea level in the 2000s is 4 to 6 inches higher than in the early 1960s” and we find that approximately 75 mm or 2.95 inches of that was due to the land sinking (GIA effects only — nothing included here for subsidence caused by the settling of land created by fill), that leaves us with:
Or, in pictures: (footnote 12)
To cover all the bases, let’s include a grid of both variables, Relative SLR and GIA:
This grid shows that the mean value (highlighted) at about 2” of absolute sea surface rise over our 50 year time period at the Battery.
Then using the long term, pre-AWG 100-year trend for Global Sea Level Rise of 1.7 mm/yr, we would expect, for 50 years (1960-2010): 50 times 1.7 mm = 85 mm (or 3.35 inches) of sea level rise due to this inexorable rise of the sea as the world works its way out of the last ice age
Subtracting the expected geologically-caused sea level rise from the actual sea level rise experienced should result in a remainder that would be the portion of the absolute sea level rise that could be attributed to recent Anthropogenic Global Warming.
Thus we now can calculate:
plus 50 mm attributable to rising sea level minus 85 mm expected from long-term general worldwide sea level trends equals minus 35 mm or 1.37 inches less than expected from the geologically-caused sea level rise trend, leaving less than nothing to be attributed to AGW-induced sea level rise.
All of this in pictures:
Using our grid of two variables:
Note that only under the Highest Relative SLR/Lowest Subsidence Rate scenario does this result even become positive – and then only by 15 mm/0.6 inches.
This brings us the somewhat surprising conclusion that the relative sea level change at the Battery in NYC which can be attributed to Anthropogenic Global Warming (by any of its commonly used names) is probably less than zero and certainly not significant. Rather, sea level change at the Battery, when calculating with the means of the variable ranges, is approximately 35 mm less than would be normally expected if the sea level change at the Battery was simply following the long-term slow and gradual rise seen to have begun worldwide at least 150 years ago (long before AGW is posited to have begun). It is not suspected that AGW caused this deficit.
Summary:
At the Battery, Manhattan, NYC over the period 1960-2010, we found less than zero mm/inches of sea level rise to be attributed to post-1960 AGW. With admittedly rough calculations, it appears that NY City has seen “4 to 6 inches” – 100 to 150 mm — of sea level change over the last 50 years, which is approximately equivalent to “8 inches in 100 years”, but over 3 inches — 85 mm of the relative change — was due to subsidence (land sinking) as a result of GIA. Subtracting the subsidence from the relative rise leaves only 2 inches — 50 mm –of rise attributable to the sea actually getting higher – which is less than the 3.3 inches — 85 mm — which would be expected from long-term pre-AGW (150 year) worldwide positive sea level rise trends, the trend agreed by all not caused by AGW, but attributed to geological causes, usually to the ocean water warming and expanding after the end of the last Ice Age.
Bottom Line:
The claim is a “Scientific Urban Legend” – made up of the TRUE and obvious fact that any positive change in local average relative sea level will make any storm surge “worse” – by the simple effect of the relative water level being higher by whatever amount — blended with the FALSE assumption/assertion that some or all of the oft cited 8 inches of Global Sea Level rise over the last 100 years had actually taken place in or around NY City and that this sea level rise had been caused by Anthropogenic Global Warming.
At the Battery, Manhattan, NYC, there has been, so far, no significant sea level rise attributable to AGW. Period. Therefore, it is extremely unlikely that AGW-induced sea level rise contributed in any real world sense to the destruction caused by Hurricane Sandy’s storm surge.
EPILOGUE:
None of the above means that NY City and surrounding areas should quit worrying about sea level rise. The sea is rising, has been rising, and will continue to rise. The coastal areas of NY and NJ are sinking and will continue to sink. Both of these conditions will continue until geological conditions change to stop them—perhaps in millennia. The recent warming of the atmosphere may yet cause discernible additional sea level rise at the Battery. NY/NJ should plan for a continued sea level rise range of 1.7-2.8 mm/yr for the foreseeable future and take positive steps to mitigate the known dangers. So far, it simply has had nothing to do with AGW.
1 – Here Comes the Story of No Hurricanes by Chris Mooney | Fri Sep. 6, 2013 6:55 AM PDT
http://www.motherjones.com/environment/2013/09/hurricane-season-ipcc-sandy
2 – New York State Sea Level Rise Task Force Report to the Legislature — Dec 31, 2010 http://www.dec.ny.gov/docs/administration_pdf/slrtffinalrep.pdf
3 – NYS Sea Level Rise Task Force Report 2010 cited this to:
Leatherman, S.P., R Chalfont, E. Pendleton, S. Funderbunk and T. McCandless. 1995. Vanishing Lands , Sea Level, Society, and Chesapeake Bay. Univ. of Maryland Laboratory for Coastal Research & US Fish and Wildlife Service Chesapeake Bay Field Office
http://www.fws.gov/slamm/vanishinglandssealevelsocietyandchesapeakebay2.pdf
4 – Observation of glacial isostatic adjustment in ‘‘stable’’ North America with GPS — Sella et al GEOPHYSICAL RESEARCH LETTERS, VOL. 34, L02306, doi:10.1029/2006GL027081, 2007
http://www.ngs.noaa.gov/CORS/Articles/2006GL027081.pdf
5 – http://users.coastal.ufl.edu/~arnoldo/ocp6050/homeworks/douglas91.pdf also “A 20th century acceleration in global sea-level rise” Church and White 2006 http://naturescapebroward.com/NaturalResources/ClimateChange/Documents/GRL_Church_White_2006_024826.pdf
6 – data from NOAA http://tidesandcurrents.noaa.gov/sltrends/msltrendstable.htm
text from http://reason.com/blog/2012/11/01/hurricane-sandy-and-sea-level-rise-in-ne
7 – “Climate Change Made Sandy Worse. Period.” —By Chris Mooney | Thu Nov. 8, 2012 http://www.motherjones.com/environment/2012/11/climate-change-made-sandy-worse-period The scientist that makes most of the sea level claims is Dr. Ben Strauss who “holds a Ph.D. in Ecology and Evolutionary Biology from Princeton University, an M.S. in Zoology from the University of Washington, and a B.A. in Biology from Yale University” and is a paid employee of Climate Central, a AGW advocacy organization.
8 – NYSSRLTF Report cited this as:
Colle, B.A., K. Rojowsky, and F. Buonaiuto. 2010. New York City storm surges: Climatology and an analysis of the wind and cyclone evolution. Journal of Applied Meteorology and Climatology 49 : 85 – 100. Pub ID# 3772
http://journals.ametsoc.org/doi/pdf/10.1175/2009JAMC2189.1
9 – Definition from the Wiki:
https://en.wikipedia.org/wiki/Post-glacial_rebound
10 – The NOAA reported sea level trends at http://tidesandcurrents.noaa.gov/sltrends/msltrendstable.htm and in the graph at
http://tidesandcurrents.noaa.gov/sltrends/sltrends_station.shtml?stnid=8518750
are relative sea levels – where the sea surface is in relation to a certain point on the land mass. There are no adjustments made, as they would be irrelevant. So, in plain English, the relative sea level change is the sea surface movement (up or down) plus the land mass movement (up or down). This is the sea level change you would see with your eyes if you were there.
11 – Although Church and White arrived at a figure of 1.77 mm/yr, CSIRO cites Church 2011 for uncertainty bars but states that the graph shown indicates “an average rate of rise of about 1.6 mm/yr over the 20th Century” rather than Church’s finding of 1.77 mm/yr. http://www.cmar.csiro.au/sealevel/sl_hist_few_hundred.html
12 – For our cartoon pictures, we assume that the US Geological Survey Team installed a brass reference marker at the 1960 Mean Sea Level position on our imaginary sea wall at the Battery and placed a reference tide gauge marked in inches alongside, all for our convenience.
13 – h/t for the format of this article to snopes.com
# # # # #
Thanks to Kip Hansen and Blade for the link below showing Battery Park and its nearby areas. It makes me wonder about proper compaction when the area was filled in with soil. Just a thought.
http://wattsupwiththat.files.wordpress.com/2010/11/nyc_manhattan_sl_animation.gif
Reply to The Ghost Of Big Jim Cooley (September 19, 2013 at 8:49 am):
from the Dictionary of American Slang and Colloquial Expressions. http://dictionary.reference.com/browse/Period!
My use of “Period.” derives from Mooney’s (Strauss’s?) original use. Ain’t language fun?!?
The CSIRO chart is scientifically invalid. The tide gauge and satellite altimeter sea level rise data are two completely independent measurement systems. There is no common terrestrial reference frame allowing these measurements to be stitched together in a comparison as shown in the CSIRO chart. Tide gauge data actually measure land elevation movement of sea level while satellite data measure an ocean volume proxy.
Making such comparisons is equivalent to stitching instrument temperature records onto palo-climate temperature records. NASA JPL has proposed a new satellite program in the future to address the many complexities in trying to relate satellite and tide gauge data measurements to each other but we are many years away from being able to make such comparisons reliably. Additionally the tide gauge data on the CSIRO chart is misleading as a measure of global sea level rise because the instruments used to make this chart include data from many tide gauge records which are too short in duration and do not allow for the long period multi-decadal ocean cycles to be properly reflected. Thus the CSIRO tide gauge portion of the chart over states the rate of sea level rise.
The satellite altimeter data is also far too short in duration to be used to characterize the rate of sea level rise because of the long period ocean cycle behavior. Additionally the three different satellite records used to create the overall satellite record all show inconsistencies between their individual records and the reasons for these differences are not yet fully understood.
The most accurate measure of sea level rise available is NOAA tide gauge data for instruments with 60 years or more of measurement data. Using these instruments show a sea level rise of of less than 1.8 mm/year over the last 80 or more years with no acceleration in sea level rise at all in this record.
Kip Hansen says:
September 19, 2013 at 7:23 am
“Reply to Lichanos: Thank you. Perhaps you know of some more current research, using modern highly accurate GPS data, for subsidence specifically in and around NYC?”
===========================
Kip, GPS is not accurate enough (yet) to make highly accurate elevation measurements,
that is why these are still big sellers:
http://www.mohaveinstrument.com/NewFiles/BarcodeRod.html
Just a note from a re-tired surveyor 🙂
(Last I heard you can get within 1/4″ horizontal, but 2-3 times less accurate in the vertical solutions.
Maybe someone can elaborate on this ?).
No time to really analyze this right now although I don’t see any obvious problems
Two qubbles.
1. The Battery tidal gauge isn’t the oldest in the US. Somewhat surprisingly, the oldest is at San Francisco. It was put into service in 1854
2. Contrary to common belief, Topex-poseidon is not the only satellite project to measure sea level. In particular ERS came up with a sea level rise of — as I recall — 2.0 mm per year (close to the tidal gauge value) but with broad error bands due to lack of faith in commonly used ionospheric delay models. (Topex-poseidon has a different and quite possibly superior method of determining ionospheric delays in the Radar Altimeter signal).
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Gary Pearse — It’s not impossible that the infrastructure on Manhattan is depressing the island some, however, it is worth pointing out that the skyscrapers are anchored in Ordovician Age Manhattan Schist which looks to be an extraordinarily uncompressable rock.
Reply to u.k.(us) (September 19, 2013 at 9:13 am): “GPS is not accurate enough (yet) to make highly accurate elevation measurements”
You are correct as long as you are talking about standard end-user equipment – hand-held, automotive, and standard navigational GPS equipment. To make the kinds of measurements necessary to determine both vertical and horizontal movements of land masses, accurate to the millimeter level necessary to determine GIA and fault movement for example, geologists use a continuously operating high accuracy GPS, like those being installed by the National Geodetic Survey in the CORS project — http://www.ngs.noaa.gov/CORS/ .
For more information you can see:
Impossible! We’ve eliminated subsidence from our algorithms. Therefore, it does not exist… (sarc)
Reply to Don K (September 19, 2013 at 9:41 am): “…the oldest is at San Francisco. It was put into service in 1854”
Don, you are absolutely right, according to 2004: 150th Anniversary of the San Francisco Tide Gauge (at http://oceanservice.noaa.gov/topics/navops/ports/supp_sanfran_tidegage.html ) “On June 30, 1854, the United States Coast Survey, the oldest federal scientific agency, installed a self-recording tide gauge in San Francisco Bay.”
However, the helpful folks at Tides and Currents at NOAA, show the San Francisco, California sea level trend for SF, CA starting only in 1897 (see chart at http://tidesandcurrents.noaa.gov/sltrends/msltrendstable.htm ).
What appears to be the explanation can be found at this graphic chart: http://tidesandcurrents.noaa.gov/sltrends/sltrends_station.shtml?stnid=9414290%20San%20Francisco,%20CA which shows that the tide gauge used by NOAA shifted somehow (possibly location, possibly something else) in 1897, making the continuous record only reliably available from then, instead of the earlier date.
I will leave discussion of the measurements of Global SLR to others.
izen says:
September 19, 2013 at 7:09 am
“…the ten onches from AGW…”
Citation please. Your 10″ is more than the approx. 225 mm show in the GMSL graph at the top of the post. I think like most men you exaggerate.
Reply to bw (September 19, 2013 at 8:48 am): “Sandy was not a hurricane at landfall.”
You are technically correct. I use the title “Hurricane Sandy” as it is the common name for this event, for the same reason WUWT tags this article under Hurricane Sandy. If this were a discussion on hurricanes or hurricane strengths and frequencies, I would have made the technically correct distinction.
It is important for readers to realize that this storm was just a big tropical storm that pushed a lot of water–storm surge–into NY Harbor and surrounding areas at the time coinciding with an extremely high tide. (see http://www.usatoday.com/story/tech/sciencefair/2012/10/29/sandy-full-moon-tide/1666479/ )
Had Sandy brought hurricane force winds, especially Force 3 or higher, the damages might have been not just disastrous, but horrific. If there are hurricane scientists reading here — maybe you could weigh in on “What if Sandy had been a Force 4/5 hurricane?”
Climate Change Made Sandy Worse. Period.
You expect headlines like that from moonbats like the appropriately-named Chris Mooney, but what about those proffered by “legitimate” climate scientists?
New analyses find evidence of human-caused climate change in half of the 12 extreme weather and climate events analyzed from 2012
In that press release regarding their report, they say this about SuperDuperDeluxeStorm Sandy:
However, climate-change related increases in sea level have nearly doubled today’s annual probability of a Sandy-level flood recurrence as compared to 1950. Ongoing natural and human-induced forcing of sea level ensures that Sandy-level inundation events will occur more frequently in the future from storms with less intensity and lower storm surge than Sandy.
Urban legend or not, they will not be letting go of the Weather Extreme meme any time in the near future as I noted in my blog posts the other day. If anything, I imagine the claims will get more “extreme” as the desperation to keep this CAGW shell game afloat reaches its climax. By the way you gotta love the picture in Mooney’s article directly under the head. The one word seen in the picture describes his article perfectly: WRONG.
Kip Hansen says:
September 19, 2013 at 9:41 am
“To make the kinds of measurements necessary to determine both vertical and horizontal movements of land masses, accurate to the millimeter level necessary to determine GIA and fault movement for example, geologists use a continuously operating high accuracy GPS, like those being installed by the National Geodetic Survey in the CORS project — http://www.ngs.noaa.gov/CORS/ . ”
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But, here is an excerpt from the link (they talk of approaching centimeters):
“CORS enhanced post-processed coordinates approach a few centimeters relative to the National Spatial Reference System, both horizontally and vertically.”
Yet, we are trying to find millimeters of sea level rise.
I don’t think GPS is accurate enough yet.
Just say’n.
Reply to galileonardo (September 19, 2013 at 10:56 am): “You expect headlines like that from moonbats like the appropriately-named Chris Mooney, but what about those proffered by “legitimate” climate scientists?”
Luckily, I have written only about one aspect of a single event.
There have been many online discussions and criticisms to the report “Explaining Extreme Events of 2012 from a Climate Perspective” released by the Bulletin of the American Meteorological Society (available at http://www.ametsoc.org/2012extremeeventsclimate.pdf )
Andy Revkin weighed in, mostly positively, with this Assessing the Role of Global Warming in Extreme Weather of 2012
http://dotearth.blogs.nytimes.com/2013/09/06/assessing-the-role-of-global-warming-in-extreme-weather-of-2012/ .
WUWT had this “NOAA goes full alarmist with new publication, seeing AGW in extreme weather events” at http://wattsupwiththat.com/2013/09/05/noaa-goes-full-alarmist-with-new-publication-seeing-agw-in-extreme-weather-events/ .
In my view, it is the responsibility of professional scientists and their citizen counterparts to call out the bad actors in their own fields. There has been some of this beginning over the last few years, and we can only hope for more. A recent example is Dr. Judith Curry quoting her “Concern over how the community of climate scientists allowed intolerant activists who make false claims to certainty to become the public face of the field – Roger Pielke Jr” (italics indicate words written by Dr. Pielke) at http://judithcurry.com/2013/09/17/consensus-denialism/
Gary Pearse says:
September 19, 2013 at 6:30 am
“I think an obvious omission to your calculations is the effect of the stone, steel, concrete, glass glacier that has been growing, particularly during the 20th Century over Manhattan.
The buildings do not rest on the ground, but on piles which are driven down to the very bedrock.If you’ve ever held your ears while passing a construction site because of an incredibly loud banging sound, as in this video, that’s what you’ve been hearing.
The Ghost Of Big Jim Cooley says:
September 19, 2013 at 8:49 am
“The term ‘Period’ is redundant. It adds nothing to the sentences and is therefore superfluous. Sorry, but the English do find it quite annoying.”
“Oh, why can’t the English learn to speak?” – Henry Higgins 😉
It adds emphasis.
Reply to u.k.(us) (September 19, 2013 at 11:13 am): “Yet, we are trying to find millimeters of sea level rise. I don’t think GPS is accurate enough yet.”
Please remember that I only attempt to use “reasonably accurate and readily agreed upon approximations.”
Observation of glacial isostatic adjustment in ‘‘stable’’ North America with GPS, Sella et al. 2007 ( http://www.ngs.noaa.gov/CORS/Articles/2006GL027081.pdf ), generally accepted on this point, gives the following:
These findings are supported by Spatial variability of late Holocene and 20th century sea-level rise along the Atlantic coast of the United States Englehart et al. 2009. http://geology.gsapubs.org/content/37/12/1115.abstract (abstract only)
I have queried and expert in this area, Dr. Stephen M. Lichten, Deputy Manager: JPL Communications, Tracking & Radar Division, on this point and will let you know what he says.
Reblogged this on Public Secrets and commented:
And yet they expect us to trust them?
Kip Hansen says:
September 19, 2013 at 12:12 pm
==========
It is a whole thing !!
The land surveyors would love millimeter accuracy on the fly, we’re getting close but not quite there yet.
Especially in the vertical.
I haven’t read through all the comments but this kind of thing puzzles me. The quote is a common example: “sea levels continue to rise due to global warming. The picture here is very clear. And that means that every single hurricane that hits land will push seawater farther inland when it does so. Or as one scientist told me in the wake of Sandy, “There is 100 percent certainty that sea level rise made this worse. Period.”
I don’t see how this claim can be made. Natural tidal ranges spread from low to max high water. Storms strike at unpredictable moments in that range. The only way that flooding can be outside of the range of historical possibility is if SLR has increased the range at the high end and the storm strikes at a time when the tide is at that level.
For example, even if sea level locally has risen a foot, if the storm strikes at low tide and that level is within historical parameters then the flooding is within expected bounds. Yes, you could argue that the level at that moment was higher than it was at some previous time, but how far can you go with that argument?
Did Sandy have a higher surge due to AGW? Maybe. Was it outside historical possibilities? We’d need to know the predicted high tide for that day (given the storm struck at high tide) and compare that to the historical range of tide heights.
Continuing Reply to u.k.(us):
Dr. Lichten has referred me to the following to answer your uncertainties on GIA and GPS accuracy:
International GPS Service (http://igscb.jpl.nasa.gov/igscb/resource/pubs/IGS_sp.pdf) gives a chart of Geocentric Coordinates of IGS Tracking Stations (>250 sites) at which indicates a weekly accuracy of 3 mm, which means that over time, one can fit several years of data to less than a millimeter/year rate.
The 2008 presentation by Lichten ( http://www.oosa.unvienna.org/pdf/icg/2008/icg3/22.pdf ) on chart #23, indicates results of 0.36 and .040 mm/yr.
This page http://xenon.colorado.edu/spotlight/index.php?product=spotlight&station=CHUR details measurements made at Churchill, Canada, on the Hudson Bay in millimeter accuracy (see graphs at the lower right).
Remember, it takes a long time (months at least) and specialized GPS equipment and analysis to get results to this accuracy.
All this said, it isn’t my data, so I can not defend it. I simply use the generally widely accepted data for GIA vertical movement.
Reply to Graeme M (September 19, 2013 at 1:50 pm): “I don’t see how this claim can be made.”
Their claim refers to the True part –> I said “the TRUE and obvious fact that any positive change in local average relative sea level will make any storm surge ‘worse’ – by the simple effect of the relative water level being higher by whatever amount”. If the water level starts out 6 inches higher, then the resultant water level from the surge will probably be 6 inches higher, thus more flooding. If the relative sea level had stayed at the 1960 level, there would have been less damage — those areas flooded by those extra “4 to 6 inches” would not have been flooded.
See my reply about tide here http://wattsupwiththat.com/2013/09/19/from-the-scientific-urban-legend-department-agw-sea-level-rise-made-sandy-more-destructive/#comment-1421351 and follow the link I give on that issue.
Kip Hansen says:
September 19, 2013 at 1:51 pm
“Remember, it takes a long time (months at least) and specialized GPS equipment and analysis to get results to this accuracy.
All this said, it isn’t my data, so I can not defend it. I simply use the generally widely accepted data for GIA vertical movement.”
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I never expected you to defend it.
Just wanted to delve a bit deeper into the science behind it.
Mission accomplished.
Thanks, the effort hasn’t gone unnoticed.
The Ghost Of Big Jim Cooley says:
September 19, 2013 at 8:49 am
As has been mentioned, “Period1” has an accepted definition, no matter how much it causes chapping of the Brits’ hindquarters. Of course the Brits use the term “Full stop!”, a synonym for ― wait for it ― “Period!”, which tends to have an abrasive effect on my own Texian nether regions.
Arent these OT excursions fun?
cheers,
gary
So there’s a 10 inch rise in sea level which made flooding worse from Sandy? Hmm. To my understanding the Earth was considered to be a perfect sphere till the advent of satellites in the 1950s showed that it wasn’t a perfect sphere. Apparently centrifugal force makes it bulge slightly at the Equator compared to the poles. A mere few thousand years to discover this and now, courtesy of bucket loads of taxpayer funding, we’ve learned everything there is to know.
According to Geography about.com (relying on NASA) the Earth’s diameter at the poles is a precise 7,901 miles and its diameter at the Equator is 7,926.41 miles. So the Earth clearly bulges. So far so good. Except this same geography site also shows the Earth is 7,899.8 miles in diameter at the poles and 7,926.28 miles in diameter at the Equator. I know, I know, I know I’m nitpicking. After all, that’s only a 0.0015% difference the same site has displayed at the poles. Except that miniscule percentage difference equates to 1.2 miles which equals 6,336 feet which equals 76,032 inches. Last time I checked that’s quite a bit more than 10 inches.
Ah, but that’s unfair. The figures quoted for the Equator, on the other hand, are closer; only 0.13 mile difference in diameter. So, now we’re only talking about 8,236.8 inches. Still, one whole heckuvalot more than 10 inches.
So, we can’t quite seem to get the exact diameter quite right, but gosh, we can still detect a sea level rise of 10″. And, just how many inches are there in the lower end equatorial diameter? I’m not good at arithmetic but I multiply it to 502,209,100.8 inches.
And we can tease an accurate 10 inch change out of that? And, besides this amazing accuracy, we can determine, with the same precision, that human beings are responsible for that very same 10 inches. Never mind that the Earth’s surface grows each and every year from dust deposited by those meteors we see burning up in our atmosphere. Never mind that this same dust must drift to the oceans’ floors thus raising their levels. And we don’t know the ratios. Also, never mind the silt that the rivers, great and small, carry off to the oceans, also raising the height of the sea bed, and for proof of that check out the badlands. And, never mind the impacts of plate tectonics, glacial rebound, erosion, underwater volcanic activity, and so on, and so on. And, also never mind that we’re measuring a fluid surface driven by currents, known and unknown; driven by the moon’s gravity; and whipped into waves. And it’s a fluid surface that will respond to any heat buildup by increased evaporation, thus negating somewhat its very own expected heat increase, and additionally transporting a portion of its volume to the air above.
No, we’ve factored in all of this, did our calculations, and detected a difference that’s vanishingly small. I don’t believe you.
Nice article.
Battery Point data pretty clearly demonstrates that the ‘average tide guage data’ sea rise of about 1.7 mm/year (for several hundred years) is correct and ongoing, and the satellite 3 mm/year is simply wrong.
And, at the end of the day, we really are only worried about relative sea rise, NOT a theoretical measure of ocean volume (which is what we get with satellites plus 0.3 mm/year GI Adjustment).
Pippen Kool says: September 19, 2013 at 6:31 am
Regardless of subsistence and other geological changes, flooding has to be worse with additional sea level rise. Logic.
But perhaps missing the point of the claim: That the flooding experienced is primarily due to AGW driven sea rise.
And therefore missing the point of the discussion: If there has been several hundred years of slow but steady sea rise with no recent acceleration, perhaps it is not due to anthropogenic influences, so we had better adapt and learn to live with it, and more so where the land is subsiding.