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<title lang=en>Assimilation of water-vapour airborne lidar observations: impact study on the COPS precipitation forecasts</title>
<creator>Bielli, Soline</creator>
<creator>Grzeschik, Matthias</creator>
<creator>Richard, Evelyne</creator>
<creator>Flamant, Cyrille</creator>
<creator>Champollion, Cedric</creator>
<creator>Kiemle, Christoph</creator>
<creator>Dorninger, M.</creator>
<creator>Brousseau, Pierre</creator>
<contributor>Laboratoire d'aérologie - LA (LA) ; Université Paul Sabatier - Toulouse 3 (UPS) - Institut national des sciences de l'Univers (INSU - CNRS) - Observatoire Midi-Pyrénées (OMP) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>SPACE - LATMOS ; Laboratoire Atmosphères, Milieux, Observations Spatiales (LATMOS) ; Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) - Université Pierre et Marie Curie - Paris 6 (UPMC) - Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS) - Université de Versailles Saint-Quentin-en-Yvelines (UVSQ) - Université Pierre et Marie Curie - Paris 6 (UPMC) - Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Deutsches Zentrum für Luft- und Raumfahrt (DLR)</contributor>
<contributor>Institut für Meteorologie und Geophysik [Wien] (IMGW) ; Universität Wien</contributor>
<contributor>Groupe d'étude de l'atmosphère météorologique (CNRM-GAME) ; Institut national des sciences de l'Univers (INSU - CNRS) - Météo France - Centre National de la Recherche Scientifique (CNRS)</contributor>
<description>International audience</description>
<source>ISSN: 0035-9009</source>
<source>Quarterly Journal of the Royal Meteorological Society</source>
<publisher>Wiley</publisher>
<identifier>hal-00659497</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00659497</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00659497</source>
<source>Quarterly Journal of the Royal Meteorological Society, Wiley, 2012, 138 (667), pp.1652-1667. 〈10.1002/qj.1864〉</source>
<identifier>DOI : 10.1002/qj.1864</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1002/qj.1864</relation>
<language>en</language>
<subject lang=en>LEANDRE 2</subject>
<subject lang=en>WALES</subject>
<subject lang=en>AROME</subject>
<subject lang=en>VERA</subject>
<subject>[SDU.STU.ME] Sciences of the Universe [physics]/Earth Sciences/Meteorology</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>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 mesoscale model. 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</description>
<date>2012</date>
</dc>
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