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

Bielli, Soline und Grzeschik, M. und Richard, Evelyne und Flamant, Cyrille und Champollion, C. und 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, Seiten 1652-1667. Wiley.

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

Kurzfassung

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.

Dokumentart:Zeitschriftenbeitrag
Titel:Assimilation of water vapour airborne lidar observations: Impact study on the COPS precipitation forecasts
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
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
Datum:2012
Erschienen in:Quarterly Journal of the Royal Meteorological Society
Referierte Publikation:Ja
In Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:138
Seitenbereich:Seiten 1652-1667
Verlag:Wiley
Status:veröffentlicht
Stichwörter:LEANDRE 2;WALES; AROME; VERA
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erdbeobachtung
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):R - Vorhaben LIDAR-Forschung und -Entwicklung
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Lidar
Hinterlegt von: Dr.rer.nat. Christoph Kiemle
Hinterlegt am:11 Nov 2011 13:38
Letzte Änderung:12 Dez 2013 21:24

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