Skip to comments.An area and distance weighted analysis of the impacts of station exposure on the U.S.( Temperatures)
Posted on 07/29/2012 1:27:38 PM PDT by Ernest_at_the_Beach
PRESS RELEASE July 29th, 2012 12PM PDT FOR IMMEDIATE RELEASE
A reanalysis of U.S. surface station temperatures has been performed using the recently WMO-approved Siting Classification System devised by METEO-Frances Michel Leroy. The new siting classification more accurately characterizes the quality of the location in terms of monitoring long-term spatially representative surface temperature trends. The new analysis demonstrates that reported 1979-2008 U.S. temperature trends are spuriously doubled, with 92% of that over-estimation resulting from erroneous NOAA adjustments of well-sited stations upward. The paper is the first to use the updated siting system which addresses USHCN siting issues and data adjustments.
The new improved assessment, for the years 1979 to 2008, yields a trend of +0.155C per decade from the high quality sites, a +0.248 C per decade trend for poorly sited locations, and a trend of +0.309 C per decade after NOAA adjusts the data. This issue of station siting quality is expected to be an issue with respect to the monitoring of land surface temperature throughout the Global Historical Climate Network and in the BEST network.
Today, a new paper has been released that is the culmination of knowledge gleaned from five years or work by Anthony Watts and the many volunteers and contributors to the SurfaceStations project started in 2007.
This pre-publication draft paper, titled An area and distance weighted analysis of the impacts of station exposure on the U.S. Historical Climatology Network temperatures and temperature trends, is co-authored by Anthony Watts of California, Evan Jones of New York, Stephen McIntyre of Toronto, Canada, and Dr. John R. Christy from the Department of Atmospheric Science, University of Alabama, Huntsville, is to be submitted for publication.
The pre-release of this paper follows the practice embraced by Dr. Richard Muller, of the Berkeley Earth Surface Temperature project in a June 2011 interview with Scientific Americans Michael Lemonick in Science Talk, said:
I know that is prior to acceptance, but in the tradition that I grew up in (under Nobel Laureate Luis Alvarez) we always widely distributed preprints of papers prior to their publication or even submission. That guaranteed a much wider peer review than we obtained from mere referees.
The USHCN is one of the main metrics used to gauge the temperature changes in the United States. The first wide scale effort to address siting issues, Watts, (2009), a collated photographic survey, showed that approximately 90% of USHCN stations were compromised by encroachment of urbanity in the form of heat sinks and sources, such as concrete, asphalt, air conditioning system heat exchangers, roadways, airport tarmac, and other issues. This finding was backed up by an August 2011 U.S. General Accounting Office investigation and report titled: Climate Monitoring: NOAA Can Improve Management of the U.S. Historical Climatology Network
All three papers examining the station siting issue, using early data gathered by the SurfaceStations project, Menne et al (2010), authored by Dr. Matt Menne of NCDC, Fall et al, 2011, authored by Dr. Souleymane Fall of Tuskeegee University and co-authored by Anthony Watts, and Muller et al 2012, authored by Dr. Richard Muller of the University of California, Berkeley and founder of the Berkeley Earth Surface Temperature Project (BEST) were inconclusive in finding effects on temperature trends used to gauge the temperature change in the United States over the last century.
Lead author of the paper, Anthony Watts, that:
I fully accept the previous findings of these papers, including that of the Muller et al 2012 paper. These investigators found exactly what would be expected given the siting metadata they had. However, the Leroy 1999 site rating method employed, and employed in the Fall et al 2011 paper I co-authored was incomplete, and didnt properly quantify the effects.
The new rating method employed finds that station siting does indeed have a significant effect on temperature trends
Watts et al 2012 has employed a new methodology for station siting, pioneered by Michel Leroy of METEOFrance in 2010, in the paper Leroy 2010, and endorsed by the World Meteorological Organization (WMO) Commission for Instruments and Methods of Observation (CIMO-XV, 2010) Fifteenth session, in September 2010 as a WMO-ISO standard, making it suitable for reevaluating previous studies on the issue of station siting.
Previous papers all used a distance only rating system from Leroy 1999, to gauge the impact of heat sinks and sources near thermometers. Leroy 2010 shows that method to be effective for siting new stations, such as was done by NCDC adopting Leroy 1999 methods with their Climate Reference Network (CRN) in 2002 but ineffective at retroactive siting evaluation.
Leroy 2010 adds one simple but effective physical metric; surface area of the heat sinks/sources within the thermometer viewshed to quantify the total heat dissipation effect.
Using the new Leroy 2010 classification system on the older siting metadata used by Fall et al. (2011), Menne et al. (2010), and Muller et al. (2012), yields dramatically different results.
Using Leroy 2010 methods, the Watts et al 2012 paper, which studies several aspects of USHCN siting issues and data adjustments, concludes that:
These factors, combined with station siting issues, have led to a spurious doubling of U.S. mean temperature trends in the 30 year data period covered by the study from 1979 2008.
Other findings include, but are not limited to:
· Statistically significant differences between compliant and non-compliant stations exist, as well as urban and rural stations.
· Poorly sited station trends are adjusted sharply upward, and well sited stations are adjusted upward to match the already-adjusted poor stations.
· Well sited rural stations show a warming nearly three times greater after NOAA adjustment is applied.
· Urban sites warm more rapidly than semi-urban sites, which in turn warm more rapidly than rural sites.
· The raw data Tmean trend for well sited stations is 0.15°C per decade lower than adjusted Tmean trend for poorly sited stations.
· Airport USHCN stations show a significant differences in trends than other USHCN stations, and due to equipment issues and other problems, may not be representative stations for monitoring climate.
A comparison and summary of trends is shown in Figure 20 from the paper:
We will continue to investigate other issues related to bias and adjustments such as TOBs in future studies.
This press release in PDF form: Watts_et_al_2012-PRESS RELEASE-R1 (PDF)
The paper in draft form: Watts-et-al_2012_discussion_paper_webrelease (PDF)
The Figures for the paper: Watts et al 2012 Figures and Tables (PDF)
A PowerPoint presentation of findings with many additional figures is available online:
Overview of the paper (PPT)
Methodology Graphs Presentation (.PPT)
Some additional files may be added as needed.
Anthony Watts at: http://wattsupwiththat.com/about-wuwt/contact-2/
GAO-11-800 August 31, 2011, Climate Monitoring: NOAA Can Improve Management of the U.S. Historical Climatology Network Highlights Page (PDF) Full Report (PDF, 47 pages) Accessible Text Recommendations (HTML)
Fall, S., Watts, A., Nielsen‐Gammon, J. Jones, E. Niyogi, D. Christy, J. and Pielke, R.A. Sr., 2011, Analysis of the impacts of station exposure on the U.S. Historical Climatology Network temperatures and temperature trends, Journal of Geophysical Research, 116, D14120, doi:10.1029/2010JD015146, 2011
Leroy, M., 1999: Classification dun site. Note Technique no. 35. Direction des Systèmes dObservation, Météo-France, 12 pp.
Leroy, M., 2010: Siting Classification for Surface Observing Stations on Land, Climate, and Upper-air Observations JMA/WMO Workshop on Quality Management in Surface, Tokyo, Japan 27-30 July 2010 http://www.jma.go.jp/jma/en/Activities/qmws_2010/CountryReport/CS202_Leroy.pdf
Menne, M. J., C. N. Williams Jr., and M. A. Palecki, 2010: On the reliability of the U.S. surface temperature record, J. Geophys. Res., 115, D11108, doi:10.1029/2009JD013094
Muller, R.A., Curry, J., Groom, D. Jacobsen, R.,Perlmutter, S. Rohde, R. Rosenfeld, A., Wickham, C., Wurtele, J., 2012: Earth Atmospheric Land Surface Temperature and Station Quality in the United States. http://berkeleyearth.org/pdf/berkeley-earth-station-quality.pdf
Watts, A., 2009: Is the U.S. surface temperature record reliable? Published online at: http://wattsupwiththat.files.wordpress.com/2009/05/surfacestationsreport_spring09.pdf
World Meteorological Organization Commission for Instruments and Methods of Observation, Fifteenth session, (CIMO-XV, 2010) WMO publication Number 1064, available online at: http://www.wmo.int/pages/prog/www/CIMO/CIMO15-WMO1064/1064_en.pdf
1. The SurfaceStations project was a crowd sourcing project started in June 2007, done entirely with citizen volunteers (over 650), created in response to the realization that very little physical site survey metadata exists for the entire United States Historical Climatological Network (USHCN) and Global Historical Climatological Network (GHCN) surface station records worldwide. This realization came about from a discussion of a paper and some new information that occurred on Dr. Roger Pielke Sr. Research Group Weblog. In particular, a thread regarding the paper: Pielke Sr., R.A., C. Davey, D. Niyogi, S. Fall, J. Steinweg-Woods, K. Hubbard, X. Lin, M. Cai, Y.-K. Lim, H. Li, J. Nielsen-Gammon, K. Gallo, R. Hale, R. Mahmood, R.T. McNider, and P. Blanken, 2007: Unresolved issues with the assessment of multi-decadal global land surface temperature trends. J. Geophys. Res.
News Release for Dr. James Hansen....your DATA SUCKS BAD!!!
So global warming is a scam? Who knew?
Just about everyone from FR . . . that's who(m).
Actually the globe IS warming... for about 10 to 20 thousand years now..
ELSE the Great Lakes would be glaciers... and Montreal would be Ice Sculpture..
Of course humans had nothing at all to do with it..
But it is warming... or has been.. may be cooling presently..
You know... stuff happens..
Seems humanity generally is on a paranoid kick lately..
Like the earth will END, Slow down, everything turn to poop, apocalypse.. SOMETHING..
The entertainment never ends.. Whats not to like?..
The first response from alarmists will be:
“but the United States represents only 3% of the earth’s surface, so this doesn’t matter”
for which the correct retort is:
“the United States has the vast majority of temperature measurement stations. Because of this, United States stations are used to correct foreign stations for UHI effects. Thus nearly all foreign stations are using the wrong correction, one that shows too much heating”
You mean my temperature station next to the blast furnace at the local steel mill is giving inaccurate readings?
My understanding is that there has been an ever so slight cooling trend since Roman times.
Up during Roman times. Down during the Dark Ages (which may have had something to do with their Darkness). Then back up again during the Middle Ages and down during the Little Ice Age. Up for the last 150 or 200 years or so.
And won't it be fun to watch the outrage when the paper's released?
Way to go Anthony, et. al.
The problem is that the lies the alarmists told, and then the media amplified, got a lot of play very quickly. There was no real science to back it up.
And, therein lies the problem. Real science takes time. It takes time to set up an experiment/study. It takes time to accumulate the data. It takes time to study the data and figure out what it is telling you. You then put it out for fellow scientists to look at, study, and try to replicate. Then, and only then, do you have an idea about what is happening. None of that was done with "global warming".
So, some time has past, and some people are finally getting the data on this subject and it does not support the alarmists pov. Now, we are going to know about this study; but, the media will studiously ignore it.
So this is what the notice was about on WUWT yesterday. Will be watching for reaction from Mann, et al.
Sorry, I forgot the sarcasm tag.
[ My understanding is that there has been an ever so slight cooling trend since Roman times. ]
Ambient temp. goes up and down every day. month, year, decade, millennium..
Its a matter of where you are and the season..
Yarns about trends are just that.. a good or bad story..
Could be true................. or not...
Mann may respond, but he is not station siting expert (and a poor statistician to boot). Realclimate, the Fenton communications propaganda site that Mann is part of, may respond quickly. They will probably pick on a dozen or so nits and then dismiss the results. Their “science” is necessary for the rest of the catastrophic warming crowd to publish their talking points, mostly on their own obscure blogs that only catastrophists care about.
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