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Assimilation of water vapour airborne lidar observations: Impact study on the COPS precipitation forecasts

Bielli, Soline and Grzeschik, M. and Richard, Evelyne and Flamant, Cyrille and Champollion, C. and Kiemle, C. (2012) Assimilation of water vapour airborne lidar observations: Impact study on the COPS precipitation forecasts. Quarterly Journal of the Royal Meteorological Society, 138, pp. 1652-1667. Wiley.

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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/qj.1864/pdf

Abstract

The Convective and Orographically-driven Precipitation Study (COPS) carried out in summer 2007 over northeastern France and southwestern Germany provided a fairly comprehensive description of the low-troposphere water-vapour field, thanks in particular to the deployment of two airborne differential absorption lidar systems. These lidar observations were assimilated using the 3D-Var assimilation system of the Application of Research to Operations at MEsoscale (AROME) numerical weather prediction mesoscalemodel. The assimilation was carried out for the period 4 July�3 August by running a three-hour forward intermittent assimilation cycle. First, the impact of the lidar observations was assessed by comparing the analyses with a set of more than 200 independent soundings. The lidar observations were found to have a positive impact on the analyses by reducing the dry bias in the first 500 m above ground level and by diminishing the root-mean-square error by roughly 15% in the first km. Then the impact of the lidar observations was assessed by comparing the precipitation forecasts (obtained with and without the lidar observations for the period 15 July�2 August) with the gridded precipitation observations provided by the Vienna Enhanced Resolution Analysis. In general, the impact was found to be positive but not significant for the 24 h precipitation and positive and significant for the 6 h precipitation, with an improvement lasting up to 24 h. Some selected case studies show that the improvement was obtained through a better depiction of convection initiation or through a more accurate positioning of the precipitation systems.

Document Type:Article
Title:Assimilation of water vapour airborne lidar observations: Impact study on the COPS precipitation forecasts
Authors:
AuthorsInstitution or Email of Authors
Bielli, SolineCNRS Toulouse, F
Grzeschik, M.CNRS Toulouse, F
Richard, EvelyneCNRS Toulouse, F
Flamant, CyrilleUniv. Pierre et Marie Curie, Paris, F
Champollion, C.Univ. Montpellier, F
Kiemle, C.DLR IPA
Date:2012
Journal or Publication Title:Quarterly Journal of the Royal Meteorological Society
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:138
Page Range:pp. 1652-1667
Publisher:Wiley
Status:Published
Keywords:LEANDRE 2;WALES; AROME; VERA
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 LIDAR-Forschung und -Entwicklung
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Lidar
Deposited By: Dr.rer.nat. Christoph Kiemle
Deposited On:11 Nov 2011 13:38
Last Modified:12 Dec 2013 21:24

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