elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Impressum | Kontakt | English
Schriftgröße: [-] Text [+]

Long-range Airborne Water Vapour Lidar Observations: Comparisons with ECMWF Analyses and First 4D-VAR Assimilation Experiments

Kiemle, Christoph und Flentje, Harald und Holm, Elias und Fix, Andreas und Dörnbrack, Andreas und Weissmann, Martin und Ehret, Gerhard (2006) Long-range Airborne Water Vapour Lidar Observations: Comparisons with ECMWF Analyses and First 4D-VAR Assimilation Experiments. In: Proceedings of the 7th Int. Workshop on Adjoint Applications in Dynamic Meteorology, Seiten 54-55. Innsbruck University Press. 7th Int. Workshop on Adjoint Applications in Dynamic Meteorology, 2006-10-10, Obergurgl, (A). ISBN 3-901249-98-2.

Dieses Archiv kann nicht den gesamten Text zur Verfügung stellen.

Kurzfassung

Airborne differential absorption lidar (DIAL) measurements of mid-latitude, subtropical and tropical water vapour were performed during several recent campaigns over North and South America, and Australia, as well as on the long-range transfer flights from and to Germany with the DLR “Falcon” research aircraft. These measurements include tropospheric as well as lower stratospheric observations. Complex advection and rapid vertical transport associated with meso- and synoptic scale dynamical processes reflect in inhomogeneous water vapor distributions along the flight paths, as observed by the lidar. The DIAL vertical H2O cross sections are compared to operational ECMWF analyses at T511/L60 and T799/L91 resolution, interpolated in space and time to the flight path. Qualitatively, the tropical (Hadley) circulation, stratospheric intrusions and humidity transitions between different air masses are analyzed by ECMWF with remarkable accuracy. Locally however, relative shifts and differing shapes of structures, particularly those exhibiting large q-gradients and being subject to rapid temporal development may cause considerable deviations. The relevant transport processes are adequately represented in the ECMWF analyses as long as vertical and horizontal scales exceed roughly 0.5-1 km in the vertical and roughly 50 km horizontally. Recently, impact studies at ECMWF started to investigate possible analysis and forecast improvement by assimilating these water vapour observations. First experiments indicated a reduction of the first-guess (12 h forecast) error compared to a control run, and the investigation of background and analysis departures confirmed the high quality of the data set. The basic DIAL processing steps and characteristics of the instrument errors will be presented. Further experiments to assimilate the full tropospheric and stratospheric lidar data set and sensitivity studies to optimize the use of the data in the ECMWF 4D-Var system are ongoing.

Dokumentart:Konferenzbeitrag (Poster)
Titel:Long-range Airborne Water Vapour Lidar Observations: Comparisons with ECMWF Analyses and First 4D-VAR Assimilation Experiments
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Kiemle, ChristophNICHT SPEZIFIZIERT
Flentje, HaraldDWD
Holm, EliasECMWF
Fix, AndreasNICHT SPEZIFIZIERT
Dörnbrack, AndreasNICHT SPEZIFIZIERT
Weissmann, MartinNICHT SPEZIFIZIERT
Ehret, GerhardNICHT SPEZIFIZIERT
Datum:10 Oktober 2006
Erschienen in:Proceedings of the 7th Int. Workshop on Adjoint Applications in Dynamic Meteorology
Referierte Publikation:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Seitenbereich:Seiten 54-55
Herausgeber:
HerausgeberInstitution und/oder E-Mail-Adresse der Herausgeber
Ehrendorfer, MartinNICHT SPEZIFIZIERT
Errico, Ron M.NICHT SPEZIFIZIERT
Verlag:Innsbruck University Press
Name der Reihe:Conference Series
ISBN:3-901249-98-2
Status:veröffentlicht
Stichwörter:water vapor lidar
Veranstaltungstitel:7th Int. Workshop on Adjoint Applications in Dynamic Meteorology
Veranstaltungsort:Obergurgl, (A)
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2006-10-10
Veranstalter :Univ. Innsbruck
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EO - Erdbeobachtung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben LIDAR-Forschung und -Entwicklung (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Lidar
Hinterlegt von: Dr.rer.nat. Christoph Kiemle
Hinterlegt am:21 Jun 2007
Letzte Änderung:27 Apr 2009 13:52

Nur für Mitarbeiter des Archivs: Kontrollseite des Eintrags

Blättern
Suchen
Hilfe & Kontakt
Informationen
electronic library verwendet EPrints 3.3.12
Copyright © 2008-2013 Deutsches Zentrum für Luft- und Raumfahrt (DLR). Alle Rechte vorbehalten.