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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

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doi:10.5194/amt-2016-344
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
03 Nov 2016
Review status
This discussion paper is under review for the journal Atmospheric Measurement Techniques (AMT).
Consistency between GRUAN sondes, LBLRTM and IASI
Xavier Calbet1, Niobe Peinado-Galan2, Pilar Ripodas1, Tim Trent3,4, Ruud Dirksen5, and Michael Sommer5 1AEMET, C/Leonardo Prieto Castro, 8, Ciudad Universitaria, 28071 Madrid, Spain
2University of Valencia, Physics Faculty, Carrer del Dr. Moliner, 50, 46100 Burjassot, Valencia, Spain
3Earth Observation Science, Department of Physics and Astronomy, University of Leicester, University Road, Leicester, LE1 7RH, UK
4National Centre for Earth Observation, Department of Physics and Astronomy, University of Leicester, University Road, Leicester, LE1 7RH, UK
5Deutscher Wetterdienst; Meteorologisches Observatorium Lindenberg, Richard-Aßmann-Observatorium, Am Observatorium 12, 15848 Lindenberg/Tauche, Germany
Abstract. Radiosonde soundings from the GRUAN data record are shown to be consistent with IASI measured radiances via the LBLRTM 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 to have consistency between radiosonde and satellite measurements for climate data records, since GRUAN, IASI and LBLRTM constitute reference measurements in each of their fields. This is specially the case for night time radiosonde measurements. Although the sample size is small (16 cases), day time 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.

Citation: Calbet, X., Peinado-Galan, N., Ripodas, P., Trent, T., Dirksen, R., and Sommer, M.: Consistency between GRUAN sondes, LBLRTM and IASI, Atmos. Meas. Tech. Discuss., doi:10.5194/amt-2016-344, in review, 2016.
Xavier Calbet et al.
Xavier Calbet et al.
Xavier Calbet et al.

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Short summary
GRUAN temperature and water vapor radiosonde measurements are shown to be consistent with infrared hyperspectral measurements from IASI using the reference LBLRTM as radiative transfer model. Long term Climate data records of temperature and water vapor can be derived from radiosonde measurements and from space based instruments. In order to have accurate and homogenous useful data series, it is a critical necessary condition that these datasets are consistent with each other.
GRUAN temperature and water vapor radiosonde measurements are shown to be consistent with...
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