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Consistency between GRUAN sondes, LBLRTM and IASI

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posted on 2018-05-10, 08:35 authored by Xavier Calbet, Niobe Peinado-Galan, Pilar Rípodas, Tim Trent, Ruud Dirksen, Michael Sommer
Radiosonde soundings from the GCOS Reference Upper-Air Network (GRUAN) data record are shown to be consistent with Infrared Atmospheric Sounding Instrument (IASI)-measured radiances via LBLRTM (Line-By-Line Radiative Transfer Model) in the part of the spectrum that is mostly affected by water vapour absorption in the upper troposphere (from 700 hPa up). This result is key for climate data records, since GRUAN, IASI and LBLRTM constitute reference measurements or a reference radiative transfer model in each of their fields. This is specially the case for night-time radiosonde measurements. Although the sample size is small (16 cases), daytime GRUAN radiosonde measurements seem to have a small dry bias of 2.5 % in absolute terms of relative humidity, located mainly in the upper troposphere, with respect to LBLRTM and IASI. Full metrological closure is not yet possible and will not be until collocation uncertainties are better characterized and a full uncertainty covariance matrix is clarified for GRUAN.

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Citation

Atmospheric Measurement Techniques, 2017, 10 (6), pp. 2323-2335

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Version

  • VoR (Version of Record)

Published in

Atmospheric Measurement Techniques

Publisher

European Geosciences Union

issn

1867-1381

eissn

1867-8548

Acceptance date

2017-05-10

Copyright date

2017

Available date

2018-05-10

Publisher version

https://www.atmos-meas-tech.net/10/2323/2017/

Language

en

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