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Besides the issues of how much global warming might be attributed to CO2 levels, there is the question of how accurately the average global temperature is measured and computed, and how meaningful it is.
Portion of the near surface temperature warming is undoubtedly due to UHI from various man-related sources. The amount of UH that finds its way into official temperature trends has always been in dispute. The effect of this additional heat radiation into the atmosphere may have been estimated but I haven’t noticed any published data or mention of it.
Part of the Abstract is copied here:
JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 116, D14113, 12 PP., 2011
doi:10.1029/2010JD015452
Observed surface warming induced by urbanization in east China
Observed surface warming induced by urbanization in east ChinaKey Points
- The rapid urbanization has significant impacts on temperature over east China
- A new method was developed to dynamically classify urban and rural stations
- Comparison of the trends of UHI effects by using OMR and UMR approaches
Xuchao Yang. Shanghai Typhoon Institute of China Meteorological Administration, Shanghai, China
Institute of Meteorological Sciences, Zhejiang Meteorological Bureau, Hangzhou, China
Yiling Hou. Shanghai Climate Center, Shanghai, China
Baode Chen. Shanghai Typhoon Institute of China Meteorological Administration, Shanghai, China
Monthly mean surface air temperature data from 463 meteorological stations, including those from the 1981–2007 ordinary and national basic reference surface stations in east China and from the National Centers for Environmental Prediction and National Center for Atmospheric Research (NCEP/NCAR) Reanalysis, are used to investigate the effect of rapid urbanization on temperature change. These stations are dynamically classified into six categories, namely, metropolis, large city, medium-sized city, small city, suburban, and rural, using satellite-measured nighttime light imagery and population census data. Both observation minus reanalysis (OMR) and urban minus rural (UMR) methods are utilized to detect surface air temperature change induced by urbanization. With objective and dynamic station classification, the observed and reanalyzed temperature changes over rural areas show good agreement, indicating that the reanalysis can effectively capture regional rural temperature trends. The trends of urban heat island (UHI) effects, determined using OMR and UMR approaches, are generally consistent and indicate that rapid urbanization has a significant influence on surface warming over east China. Overall, UHI effects contribute 24.2% to regional average warming trends. The strongest effect of urbanization on annual mean surface air temperature trends occurs over the metropolis and large city stations, with corresponding contributions of about 44% and 35% to total warming, respectively. The UHI trends are 0.398°C and 0.26°C decade−1. The most substantial UHI effect occurred after the early 2000s, implying a significant effect of rapid urbanization on surface air temperature change during this period.
These claims of UH significantly contributing to the official warming are extremely provocative. The degree of warming is certainly significant. It will be interesting to see how much of it has found its way into the official warming equation and what the responses are from the AGW proponents.
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Most of the public follow the mainstream media information blindly, their only “salvation” is to open their minds to sources and information.
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do you have any update on this?
There is not a lot on UHI compared to other information. The official IPCC scientists tell us they make allowances in their ‘modelling’.
It is arguable that they are neither attributing the correct amount of global heating actually caused by industrialization and urbanization, nor are they ensuring that the near surface temperature measurements are not artificially inflated by urban heating.
Because of my obsession with the blame being incorrectly placed on CO2, and the carbon control financial and social drive destroying our civilization, other aspects are receiving less attention.
If you don’t mind a bit of technical stuff this article on the WUWT blog adds a bit more information.