NDLI: Assimilation of water‐vapour airborne lidar observations: impact study on the COPS precipitation forecasts

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

Content Provider	Semantic Scholar
Author	Bielli, Soline Grzeschik, Matthias Richard, Evelyne Flamant, Cyrille Champollion, Cédric Kiemle, Christoph Dorninger, Manfred Brousseau, Pierre
Copyright Year	2012
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 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
Starting Page	1652
Ending Page	1667
Page Count	16
File Format	PDF HTM / HTML
DOI	10.1002/qj.1864
Volume Number	138
Alternate Webpage(s)	https://elib.dlr.de/71621/1/1864_ftp.pdf
Alternate Webpage(s)	https://doi.org/10.1002/qj.1864
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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