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TWO PAPERS - ½ of  Warming is NOT REAL

 

New study shows half of the global warming in the USA is artificial

Posted on July 29, 2012 by Anthony Watts

 

PRESS RELEASE – U.S. Temperature trends show a spurious doubling due to NOAA station siting problems and post measurement adjustments.

 

Chico, CA July 29th, 2012 – 12 PM PDT – FOR IMMEDIATE RELEASE

 

A comparison and summary of trends is shown from the paper. Acceptably placed thermometers away from common urban influences read much cooler nationwide:

A reanalysis of U.S. surface station temperatures has been performed using the recently WMO-approved Siting Classification System devised by METEO-France’s 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 of 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.

 

 

Read the whole  story at http://wattsupwiththat.com/2012/07/29/press-release-2/

 

 

Chineese Paper: up to 68% of warming is false

 

The Chinese demonstrate that UHI has a real and essential effect on regional climate change

Posted on May 13, 2013 by Anthony Watts

 

Study finds that urbanization has considerable influence on the regional climate change, they even blame proximity to air-conditioning as a factor.

 

Press release from Science China Press (full paper follows)

 

Urbanization and surface warming in eastern China

 

A recent study indicated that the urbanization in eastern China has significant impact on the observed surface warming and the temporal-spatial variations of urbanization effect have been comprehensively detected.

 

This work was led by YANG XiuQun, professor of meteorology in the Institute for Climate and Global Change Research, School of Atmospheric Sciences at Nanjing University. The article entitled “Urbanization and heterogeneous surface warming in eastern China” was published in Chinese Science Bulletin, 2013, No. 12.

 

Urbanization, as one of the most significant processes in land use/cover change, can not only alter surface vegetation distribution, but also affect surface energy and water balance. Some previous studies indicated that urbanization has little impact on surface warming. However, recent investigations have suggested that urbanization plays an essential role in regional climate change.

 

China has been experiencing intensive urbanization since the 1980s. Due to close ties in social and economic aspects, single cities have expanded to form distinctive city clusters in eastern China, such as the Beijing-Tianjin-Hebei (BTH), Yangtze River Delta (YRD) and Pearl River Delta (PRD) city clusters. Combining the social needs with scientific issues, Professor YANG XiuQun and his group dedicate to explore the climatic effect of urbanization in eastern China from observation and simulation perspectives. The objective of their work is to estimate the effect of urbanization on surface air temperature (SAT) change, detect the seasonal variation of urban warming in different regions, and analyze the impact of urbanization on maximum and minimum temperatures.

 

With the homogeneity-adjusted SAT data at 312 stations in eastern China for 1979-2008 and the Defense Meteorological Satellite Program/Operational Linescan System (DMSP/OLS) nighttime light data, the spatial heterogeneities of the SAT trends on different scales are detected and the impact of urbanization in eastern China on surface warming is analyzed.

 

Results show that the urbanization can induce a remarkable summer warming in YRD city cluster region and a winter warming in BTH city cluster region. The YRD warming in summer primarily results from the significant increasing of maximum temperature, with an estimated urban warming rate at 0.132-0.250°C per decade, accounting for 36%-68% of the total regional warming. The BTH warming in winter is primarily due to the remarkable increasing of minimum temperature, with an estimated urban warming rate at 0.102-0.214°C per decade, accounting for 12%-24% of the total regional warming.

 

The study finds that urbanization has considerable influence on the regional climate change. Therefore, a more reasonable urban planning should be considered in order to mitigate regional surface warming. In addition, the climatic effect of urbanization features obvious temporal-spatial differences, which may be associated with the variation of regional climatic background and the change of anthropogenic heat release. Detection and assessment of the climatic effect of urbanization is of great significance for further understanding the relationship between urban development and climate change.

###

 

This work was supported by the National Basic Research Program of China (2010CB428504).

 

Wu K, Yang X Q. Urbanization and heterogeneous surface warming in eastern China. Chin Sci Bull, 58(12):1363-1373, doi: 10.1007/s11434-012-5627-8

 

http://csb.scichina.com:8080/kxtbe/EN/volumn/home.shtml

 

http://link.springer.com/article/10.1007%2Fs11434-012-5627-8

 

Science China Press Co., Ltd. (SCP) is a scientific journal publishing company of the Chinese Academy of Sciences (CAS). For 50 years, SCP takes its mission to present to the world the best achievements by Chinese scientists on various fields of natural sciences researches.