Comments
Issues With The Assessment Of Multi-Decadal Surface Temperature Trends Remain Unresolved
Roger Pielke Sr reports on his Climate Science weblog that Parker et al have commented on the 2007 Pielke Sr et al paper ‘Unresolved issues with the assessment of multi-decadal global land surface temperature trends.’
Of course, Parker et al (2004, 2006) and Peterson et al (2003) were relied upon by IPCC AR4 to minimise the Urban Heat Island Effect.
The comment by Parker et al is in press in JGR-Atmospheres on our 2007 paper:
Parker, D. E., P. Jones, T. C. Peterson, and J. Kennedy (2009), Comment on ‘Unresolved Issues with the Assessment of Multi-Decadal Global Land Surface Temperature Trends’ by Roger A. Pielke, Sr. et al., J. Geophys. Res., doi:10.1029/2008JD010450, in press.
Their conclusion reads:
”Prompted by Pielke et al. [2007]’s concerns, we have provided an additional demonstration of the robustness of global and hemispheric land surface air temperature series. We have shown that Pielke et al [ 2007]’s attribution of changed temperature trends to local LULC changes is not firmly based. We nevertheless agree with Pielke et al. [2007] in aspirations for an improved global network monitoring all Global Climate Observing System (GCOS) Essential Climate Variables including humidity as well as temperature; for universal adherence to the GCOS Climate Monitoring Principles (http://www.wmo.ch/pages/prog/gcos/index.php?name=monitoringprinciples) which include the availability of full metadata such as photographic documentation; and for as well as the rescue and digitization of all historical data.”
Our Reply is also in press. It is:
Pielke Sr., R. A., C. A. 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, S. Foster, R. T. McNider, and P. Blanken (2009), Reply to comment by David E. Parker, Phil Jones, Thomas C. Peterson, and John Kennedy on ‘Unresolved Issues with the Assessment of Multi-Decadal Global Land Surface Temperature Trends’ . J. Geophys. Res., doi:10.1029/2008JD010938, in press. [the AGU on-line version is at http://www.agu.org/journals/pip/jd/2008JD010938-pip.pdf].
Our conclusion reads:
“We welcome a critical examination and further analysis of each of the arguments and findings in Pielke et al. [2007a]. Indeed, we are continuing this further assessment; e.g., see Lin et al. [2007]. However, the analyses performed by Parker et al. [2008] do little to improve confidence in the global surface temperature record. In particular, we reaffirm the statement in Pielke et al. [2007a] that nearby changes in LULC may be influencing the temperature trends observed at surface climate observing stations. We further continue to emphasize the lack of data independence in the global surface temperature analyses [including that of Parker et al. 2008]. We do agree with Parker et al. [2008] that data sparseness makes temperature trend estimates less robust over many parts of the globe, and join their call for improved data collection, metadata, and data rescue.”
Read the entire Climate Science weblog post: Reply By Pielke Et Al To The Comment By Parker Et Al. On Our 2007 JGR paper “Unresolved Issues With The Assessment Of Multi-Decadal Global Land Surface Temperature Trends”
June 1st, 2009 at 8:34 am
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