reference : Sensitivity of satellite-derived tropospheric temperature trends to the diurnal cycle adjustment

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/reference/0215f34d-335f-4105-a3eb-b660e0ff8a78
Bibliographic fields
reftype Journal Article
Abstract Temperature sounding microwave radiometers flown on polar-orbiting weather satellites provide a long-term, global-scale record of upper-atmosphere temperatures, beginning in late 1978 and continuing to the present. The focus of this paper is the midtropospheric measurements made by the Microwave Sounding Unit (MSU) channel 2 and the Advanced Microwave Sounding Unit (AMSU) channel 5. Previous versions of the Remote Sensing Systems (RSS) dataset have used a diurnal climatology derived from general circulation model output to remove the effects of drifting local measurement time. This paper presents evidence that this previous method is not sufficiently accurate and presents several alternative methods to optimize these adjustments using information from the satellite measurements themselves. These are used to construct a number of candidate climate data records using measurements from 15 MSU and AMSU satellites. The new methods result in improved agreement between measurements made by different satellites at the same time. A method is chosen based on an optimized second harmonic adjustment to produce a new version of the RSS dataset, version 4.0. The new dataset shows substantially increased global-scale warming relative to the previous version of the dataset, particularly after 1998. The new dataset shows more warming than most other midtropospheric data records constructed from the same set of satellites. It is also shown that the new dataset is consistent with long-term changes in total column water vapor over the tropical oceans, lending support to its long-term accuracy.
Author Carl A. Mears; Frank J. Wentz
DOI 10.1175/JCLI-D-15-0744.1
Issue 10
Journal Journal of Climate
Keywords Atm/Ocean Structure/ Phenomena,Troposphere,Physical Meteorology and Climatology,Temperature,Observational techniques and algorithms,Climate records,Microwave observations,Satellite observations
Pages 3629-3646
Title Sensitivity of satellite-derived tropospheric temperature trends to the diurnal cycle adjustment
Volume 29
Year 2016
Bibliographic identifiers
.reference_type 0
_record_number 19439
_uuid 0215f34d-335f-4105-a3eb-b660e0ff8a78