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Technical Note: 30 years of HIRS data of upper tropospheric humidity

Gierens, Klaus and Eleftheratos, Kostas and Shi, L. (2014) Technical Note: 30 years of HIRS data of upper tropospheric humidity. Atmospheric Chemistry and Physics, 14, pp. 7533-7541. Copernicus Publications. doi: 10.5194/acp-14-7533-2014. ISSN 1680-7316.

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Official URL: http://www.atmos-chem-phys.net/14/7533/2014/acp-14-7533-2014.pdf


We use 30 years of intercalibrated HIRS (High- Resolution Infrared Radiation Sounder) data to produce a 30-year data set of upper tropospheric humidity with respect to ice (UTHi). Since the required brightness temperatures (channels 12 and 6, T12 and T6) are intercalibrated to different versions of the HIRS sensors (HIRS/2 and HIRS/4) it is necessary to convert the channel 6 brightness temperatures which are intercalibrated to HIRS/4 into equivalent brightness temperatures intercalibrated to HIRS/2, which is achieved using a linear regression. Using the new regression coefficients we produce daily files of UTHi, T12 and T6, for each NOAA satellite and METOP-A (Meteorological Operational Satellite Programme), which carry the HIRS instrument. From this we calculate daily and monthly means in 2.5°×2.5° resolution for the northern midlatitude zone 30°–60°N. As a first application we calculate decadal means of UTHi and the brightness temperatures for the two decades 1980–1989 and 2000–2009. We find that the humidity mainly increased from the 1980s to the 2000s and that this increase is highly statistically significant in large regions of the considered midlatitude belt. The main reason for this result and its statistical significance is the corresponding increase of the T12 variance. Changes of the mean brightness temperatures are less significant.

Item URL in elib:https://elib.dlr.de/90035/
Document Type:Article
Additional Information:Die Veröffentlichung resultiert aus einer Kooperation im Rahmen von DAAD
Title:Technical Note: 30 years of HIRS data of upper tropospheric humidity
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Eleftheratos, KostasUniv. of Athens, GRUNSPECIFIEDUNSPECIFIED
Shi, L.National Climatic Data Center, NOAA, Asheville, USAUNSPECIFIEDUNSPECIFIED
Date:28 July 2014
Journal or Publication Title:Atmospheric Chemistry and Physics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
Page Range:pp. 7533-7541
Publisher:Copernicus Publications
Keywords:Satellite data, intercalibration, upper tropospheric humidity
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Atmospheric and climate research
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Earth System Modelling
Deposited By: Gierens, Dr.rer.nat. Klaus Martin
Deposited On:28 Jul 2014 16:41
Last Modified:14 Nov 2023 13:06

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