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Title: GEWEX Water Vapor Assessment: Validation of AIRS Tropospheric Humidity Profiles With Characterized Radiosonde Soundings
Authors: Trent, Tim
Schröder, Marc
Remedios, John
First Published: 15-Jan-2019
Publisher: American Geophysical Union (AGU), Wiley
Citation: Journal of Geophysical Research: Atmospheres, 2019, 124 (2), pp. 886-906
Abstract: The tropospheric water vapor profile record from the Atmospheric Infrared Sounder (AIRS) now spans over a decade, making it a valuable resource for climate studies. To be considered as a Climate Data Record, it is key that the ultimate performance of these observations are understood. The Global Energy and Water cycle Exchanges (GEWEX) water vapor assessment has been tasked with characterizing the current state of the art in water vapor products currently available for climate analysis. Within the scope of this exercise, water vapor profiles from AIRS have been assessed using collocated characterized in situ measurements of tropospheric water vapor between 2007 and 2012. We first show how previously published methods for correcting radiosondes can be applied to global records, which show high correlations to Global Climate Observing System Reference Upper-Air Network (GRUAN) performance at pressures between the surface and 250 hPa. We go further and show the first comparison of uncertainties from both the newly created Characterized Radiosonde Measurement (CRM) and GRUAN data sets. Global estimates of AIRS water vapor profile (wet/dry) biases relative to GRUAN and CRM are within 6 ± 0.3% ppmv and 15 ± 0.1% ppmv below 300 hPa, respectively. The CRM record allows latitudinal analysis for the first time, which when examined shows sensitivity to changes in absolute concentration due to large-scale circulation in the International Tropical Convergence Zone. This paper advances the use of state-of-the-art in situ records for characterizing absolute performance, recognizing that long-term stability needs further research.
DOI Link: 10.1029/2018JD028930
ISSN: 2169-897X
eISSN: 2169-8996
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © the authors, 2019. This is an open-access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Description: AIRS data can be downloaded from Information on RS92 sites is taken from 2007 release of WMO catalogue of radiosondes and upper‐air wind system information available from‐ddbs/Radiosondes.xls. The UKMO radiosonde archive is available from the Centre for Environmental Data Archival (CEDA) at The GRUAN RS92‐GDP data archive can be accessed via the project home page
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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