Stratospheric Influences on MSU-Derived Tropospheric Temperature Trends: A Direct Error Analysis
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چکیده
Retrievals of tropospheric temperature trends from data of the Microwave Sounding Unit (MSU) are subject to biases related to the strong cooling of the stratosphere during the past few decades. The magnitude of this stratospheric contamination in various retrievals is estimated using stratospheric temperature trend profiles based on observations. It is found that from 1979 to 2001 the stratospheric contribution to the trend of MSU channel2 brightness temperature is about 20.08 K decade21, which is consistent with the findings of Fu et al. In the retrieval method developed by Fu et al. based on a linear combination of MSU channels 2 and 4, the stratospheric influence is largely removed, leaving a residual influence of less than 60.01 K decade21. This method is also found to be more accurate than the angular scanning retrieval technique of Spencer and Christy to remove the stratospheric contamination.
منابع مشابه
Interactive comment on “Stratospheric and tropospheric SSU/MSU temperature trends and compared to reanalyses and IPCC CMIP5 simulations in 1979–2005” by A. M. Powell Jr. et al
Interactive comment on “Stratospheric and tropospheric SSU/MSU temperature trends and compared to reanalyses and IPCC CMIP5 simulations in 1979–2005” by A. M. Powell Jr. et al. Anonymous Referee #1 Received and published: 13 February 2013 General comments: This paper shows that the selected CMIP5 models consistently capture such important climate features as the stratospheric cooling trend due ...
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Tropospheric temperature trends based on Microwave Sounding Unit (MSU) channel 2 data are susceptible to contamination from strong stratospheric cooling. Recently, Fu et al. devised a method of removing the stratospheric contamination by linearly combining data from MSU channels 2 and 4. In this study the sensitivity of the weights of the two channels in the retrieval algorithm for the troposph...
متن کاملInteractive comment on “Stratospheric and tropospheric SSU/MSU temperature trends and compared to reanalyses and IPCC CMIP5 simulations in 1979–2005” by A. M. Powell Jr. et al
This paper presents a comparison of global temperature variations in the stratosphere and troposphere between satellite measurements (SSU + MSU), reanalysis data sets, and CMIP5 models. The focus is on comparing interannual variability and trends among the data sets, and direct comparisons are made by constructing weighted averages of the reanalysis and model temperatures to approximately match...
متن کاملInteractive comment on “Stratospheric and tropospheric SSU/MSU temperature trends and compared to reanalyses and IPCC CMIP5 simulations in 1979–2005” by A. M. Powell Jr. et al
This paper presents a comparison of global temperature variations in the stratosphere and troposphere between satellite measurements (SSU + MSU), reanalysis data sets, and CMIP5 models. The focus is on comparing interannual variability and trends among the data sets, and direct comparisons are made by constructing weighted averages of the reanalysis and model temperatures to approximately match...
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تاریخ انتشار 2004