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Evaluation of upper tropospheric humidity forecasts from ECMWF using AIRS and CALIPSO data

Lamquin, Nicolas and Gierens, Klaus Martin and Stubenrauch, Claudia and Chatterjee, Reeshav (2009) Evaluation of upper tropospheric humidity forecasts from ECMWF using AIRS and CALIPSO data. Atmospheric Chemistry and Physics, 9, pp. 1779-1793.

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Official URL: http://www.atmos-chem-phys.net/9/1779/2009/

Abstract

An evaluation of the upper tropospheric humidity from the European Centre of Medium-Range Weather Forecasts (ECMWF) Integrated Forecast System (IFS) is presented. We first make an analysis of the spinup behaviour of ice supersaturation in weather forecasts. It shows that a spinup period of at least 12 h is necessary before using forecast humidity data from the upper troposphere. We compare the forecasted upper tropospheric humidity with coincident relative humidity fields retrieved from the Atmospheric InfraRed Sounder (AIRS) and with cloud vertical profiles from the Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO). The analysis is made over one year, from October 2006 to September 2007, and we discuss how relative humidity and cloud features appear both in the IFS and in the observations. The comparison with AIRS is made difficult because of the vertical resolution of the sounder and the impossibility to retrieve humidity for high cloudiness. Clear sky relative humidities show a rather good correlation whereas cloudy situations reflect more the effect of a dry bias for AIRS increasing with the relative humidity. The comparison with CALIPSO shows that the IFS predicts high relative humidity where CALIPSO finds high clouds, which supports the good quality of the ECMWF upper tropospheric cloud forecast. In a last part, we investigate the presence of ice supersaturation within low vertical resolution pressure layers by comparing the IFS outputs for highresolution and low-resolution humidity profiles and by simulating the interpolation of humidity over radiosonde data. A new correction method is proposed and tested with these data.

Document Type:Article
Title:Evaluation of upper tropospheric humidity forecasts from ECMWF using AIRS and CALIPSO data
Authors:
AuthorsInstitution or Email of Authors
Lamquin, NicolasEcole Polytechnique, Palaiseau, F
Gierens, Klaus MartinUNSPECIFIED
Stubenrauch, ClaudiaEcole Polytechnique, Palaiseau, F
Chatterjee, ReeshavNational Institute of Technology, Tiruchirappalli, Tamil Nadu, IND
Date:March 2009
Journal or Publication Title:Atmospheric Chemistry and Physics
Refereed publication:Yes
In Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:9
Page Range:pp. 1779-1793
Status:Published
Keywords:Weather forecast, upper troposphere, humidity, satellites
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Atmosphären- und Klimaforschung (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Dynamics
Deposited By: Dr.rer.nat. Klaus Martin Gierens
Deposited On:16 Mar 2009
Last Modified:12 Dec 2013 20:37

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