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The impact of airborne wind and water vapour lidar measurements on ECMWF analyses and forecasts

Weissmann, Martin and Cardinali, Carla and Dörnbrack, Andreas and Ehret, Gerhard and Holm, Elias and Kiemle, Christoph (2007) The impact of airborne wind and water vapour lidar measurements on ECMWF analyses and forecasts. EGU General Assembly, 2007-04-15 - 2007-04-20, Vienna, (A).

Full text not available from this repository.

Abstract

Recent impact studies show that the ECMWF forecast error could be reduced significantly by assimilating airborne Doppler lidar observations taken during the Atlantic THORPEX Regional Campaign (A-TReC). This is a very promising result, considering that observations have been gathered from only 28.5 flight hours in a 2-week period. Due to low instrumental and representativeness errors of the observations, lidar winds have a higher analysis influence than dropsondes and conventional wind observations. These encouraging results motivated similar impact studies using airborne Differential Absorption Lidar (DIAL) water vapour observations from several research campaigns. In addition to low observational errors, the high vertical resolution of DIAL lidars of up to a few hundred meters is expected to be crucial for a proper representation of the water vapour field in NWP models. In the current global observing system water vapour is primarily observed through passive satellite instruments, which have a very low vertical resolution and much higher observational errors than lidars. This paper summarizes the impact of airborne wind and water vapour lidar data on ECMWF analysis and forecast fields. Furthermore, an outlook on planned future field campaigns using airborne lidars for targeted observations is presented (COPS/ETReC, T-PARC, TNADEX).

Document Type:Conference or Workshop Item (Speech)
Title:The impact of airborne wind and water vapour lidar measurements on ECMWF analyses and forecasts
Authors:
AuthorsInstitution or Email of Authors
Weissmann, MartinUNSPECIFIED
Cardinali, CarlaECMWF, Reading, UK
Dörnbrack, AndreasUNSPECIFIED
Ehret, GerhardUNSPECIFIED
Holm, EliasECMWF, Reading, UK
Kiemle, ChristophUNSPECIFIED
Date:16 April 2007
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Keywords:wind lidar, DIAL, data assimilation, observation influence
Event Title:EGU General Assembly
Event Location:Vienna, (A)
Event Type:international Conference
Event Dates:2007-04-15 - 2007-04-20
Organizer:European Geosciences Union
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:07 May 2007
Last Modified:27 Apr 2009 13:42

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