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Comments on ““Analysis of the Merging Procedure for the MSU Daily Temperature Time Series””

Comments on ““Analysis of the Merging Procedure for the MSU Daily Temperature Time Series”” Spencer and Christy (1990) showed in a pioneering study that it is possible to monitor the global temperature with observations made in channel 2 (53.74 GHz) of the Microwave Sounding Unit (MSU). Based on this idea, Christy et al. (1998 ; CSL) analyzed the MSU data, taken from sequential National Oceanic and Atmospheric Administration (NOAA) operational satellites ( NOAA-6, -7, -9, -10, -11, -12, and -14 ), to find the global temperature trend in the period 1979––97. They find the tropospheric global temperature trend obtained from their ““T2”” time series is nearly zero (0.003 K decade −−1 ), and the global trend over the same period in the lower troposphere given by their ““T2LT”” time series has a small negative value (−−0.046 K decade −−1 ). A critical element of the CSL time series of MSU channel 2 global temperature anomalies is the small correction applied to the NOAA-11 data to account for the orbital drift of that satellite. When they implement this correction, the anomalies in MSU channel 2 temperature after 1991 are decreased systematically by about 0.17 K. As a consequence, their inferred global temperature trends for the period 1979––97, instead of being on the order http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Climate American Meteorological Society

Comments on ““Analysis of the Merging Procedure for the MSU Daily Temperature Time Series””

Journal of Climate , Volume 12 (11) – Jun 24, 1998

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Publisher
American Meteorological Society
Copyright
Copyright © 1998 American Meteorological Society
ISSN
1520-0442
DOI
10.1175/1520-0442(1999)012<3331:COAOTM>2.0.CO;2
Publisher site
See Article on Publisher Site

Abstract

Spencer and Christy (1990) showed in a pioneering study that it is possible to monitor the global temperature with observations made in channel 2 (53.74 GHz) of the Microwave Sounding Unit (MSU). Based on this idea, Christy et al. (1998 ; CSL) analyzed the MSU data, taken from sequential National Oceanic and Atmospheric Administration (NOAA) operational satellites ( NOAA-6, -7, -9, -10, -11, -12, and -14 ), to find the global temperature trend in the period 1979––97. They find the tropospheric global temperature trend obtained from their ““T2”” time series is nearly zero (0.003 K decade −−1 ), and the global trend over the same period in the lower troposphere given by their ““T2LT”” time series has a small negative value (−−0.046 K decade −−1 ). A critical element of the CSL time series of MSU channel 2 global temperature anomalies is the small correction applied to the NOAA-11 data to account for the orbital drift of that satellite. When they implement this correction, the anomalies in MSU channel 2 temperature after 1991 are decreased systematically by about 0.17 K. As a consequence, their inferred global temperature trends for the period 1979––97, instead of being on the order

Journal

Journal of ClimateAmerican Meteorological Society

Published: Jun 24, 1998

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