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Impact of airborne Doppler lidar observations on ECMWF forecasts

Weissmann, Martin and Cardinali, Carla (2007) Impact of airborne Doppler lidar observations on ECMWF forecasts. Quarterly Journal of the Royal Meteorological Society, 133, pp. 107-116. DOI: 10.1002/qj.16.

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Official URL: http://www.interscience.wiley.com

Abstract

During the Atlantic THORPEX Regional Campaign (A-TReC) in autumn 2003, the airborne Doppler lidar of the Deutsches Zentrum f¨ur Luft- und Raumfahrt (DLR) was used to observe wind in predicted sensitive regions. In eight flights, the system measured a total of 1600 wind profiles that were experimentally assimilated in the global assimilation system at the European Centre for Medium-Range Weather Forecasts (ECMWF). The present study assesses the impact of these Doppler lidar measurements in Numerical Weather Prediction (NWP). It is shown that lidar observations have a significant impact on the analyses as well as on forecasts owing to high accuracy and spatial resolution. The measurements reduce the errors of the 1–4 day forecasts of geopotential height, wind, and humidity over Europe throughout the troposphere. On average, Doppler lidar measurements reduce the 2–4 day forecast error of geopotential height over Europe by 3%. This is a promising result, considering that observations have been gathered from only 28.5 flight hours. Dropsondes released in the same area as the Doppler lidar was operating show good agreement for measured winds, but smaller analysis impact and less reduction of the forecast error.

Document Type:Article
Title:Impact of airborne Doppler lidar observations on ECMWF forecasts
Authors:
AuthorsInstitution or Email of Authors
Weissmann, MartinUNSPECIFIED
Cardinali, CarlaECMWF, Reading, UK
Date:2007
Journal or Publication Title:Quarterly Journal of the Royal Meteorological Society
Volume:133
DOI:10.1002/qj.16
Page Range:pp. 107-116
Status:Published
Keywords:Doppler lidar, data assimilation, observation influence
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Projekt ADM II (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Lidar
Deposited By: Martin Weissmann
Deposited On:24 Jul 2007
Last Modified:12 Dec 2013 20:23

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