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Experimental assimilation of DIAL water vapour observations in the ECMWF global model

Harnisch, F. and Weissmann, M. and Cardinali, C. and Wirth, M. (2011) Experimental assimilation of DIAL water vapour observations in the ECMWF global model. Quarterly Journal of the Royal Meteorological Society, 137, pp. 1532-1546.

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/qj.851/pdf


A unique airborne differential absorption lidar (DIAL) for water vapour observations was developed at the Deutsches Zentrum für Luft- und Raumfahrt (DLR). Installed on board the DLR Falcon 20 aircraft, the system measured a dataset of about 3900 water vapour profiles during the T-PARC field campaign. These highresolution humidity observations were assimilated into the European Centre for Medium-Range Weather Forecasts (ECMWF) global model using a version of the operational four-dimensional variational data assimilation system. The assimilation system is able to extract the information for DIAL observations, and verification with independent dropsonde observations shows a reduction in the analysis error when DIAL water vapour observations are assimilated. The forecast influence of the humidity observations is found to be small in most cases, but the observations are able to affect the forecast considerably under certain conditions. Systematic errors are investigated by comparison between humidity model fields, DIAL and dropsonde observations. Overall, DIAL observations are roughly 7–10%drier thanmodel fields throughout the troposphere. Comparison with dropsonde observations suggests that the DIAL observations are too dry in the lower troposphere but not above it.

Document Type:Article
Title:Experimental assimilation of DIAL water vapour observations in the ECMWF global model
AuthorsInstitution or Email of Authors
Harnisch, F.DLR
Weissmann, M.DLR
Cardinali, C.ECMWF, Reading, UK
Wirth, M.DLR
Date:July 2011
Journal or Publication Title:Quarterly Journal of the Royal Meteorological Society
Refereed publication:Yes
In Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 1532-1546
Keywords:T-PARC; observing system experiments; data assimilation
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Atmosphären- und Klimaforschung
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Lidar
Deposited By: Stephanie Zähnle
Deposited On:09 Dec 2011 12:56
Last Modified:26 Mar 2013 13:34

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