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The influence of assimilating dropsonde data on typhoon track and mid-latitude forecasts

Weissmann, Martin und Harnisch, Florian und Wu, Chun-Chieh und Lin, Po-Hsiung und Ohta, Yoichiro und Yamashita, Koji und Kim, Yeon-Hee und Jeon, Eun-Hee und Nakazawa, Tetsuo und Aberson, Sim (2011) The influence of assimilating dropsonde data on typhoon track and mid-latitude forecasts. Monthly Weather Review, 139, Seiten 908-920. DOI: 10.1175/2010MWR3377.1.

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Offizielle URL: http://journals.ametsoc.org/doi/pdf/10.1175/2010MWR3377.1

Kurzfassung

A unique data set of targeted dropsonde observations was collected during the THORPEX Pacific Asian Regional Campaign (T-PARC) in autumn 2008. The campaign was supplemented by an enhancement of the operational Dropsonde Observations for Typhoon Surveillance near the Taiwan Region (DOTSTAR) program. For the first time, up to four different aircraft were available for typhoon observations and over 1500 additional soundings were collected. This study investigates the influence of assimilating additional observations during the two major typhoon events of T-PARC on the typhoon track forecast by the global models of the European Centre for Medium-range Weather Forecasts (ECMWF), the Japan Meteorological Agency (JMA), the National Center for Environmental Prediction (NCEP) and the limited area Weather Research and Forecasting (WRF) model. Additionally, the influence of T-PARC observations on ECMWF mid-latitude forecasts is investigated. All models show an improving tendency of typhoon track forecasts, but the degree of improvement varied from about 20-40% in NCEP and WRF to a comparably low influence in ECMWF and JMA. This is likely related to lower track forecast errors without dropsondes in the latter two models, presumably caused by a more extensive use of satellite data and 4D-Var assimilation at ECMWF and JMA compared to 3D-Var of NCEP and WRF. The different behavior of the models emphasizes that the benefit gained strongly depends on the quality of the first-guess field and the assimilation system.

Dokumentart:Zeitschriftenbeitrag
Titel:The influence of assimilating dropsonde data on typhoon track and mid-latitude forecasts
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Weissmann, MartinMartin.Weissmann@dlr.de
Harnisch, FlorianFlorian.Harnisch@dlr.de
Wu, Chun-ChiehNational Taiwan Univ. Taipei, Taiwan
Lin, Po-HsiungNational Taiwan Univ. Taipei, Taiwan
Ohta, YoichiroJapan Meteorol. Agency, Tokyo, J
Yamashita, KojiJapan Meteorol. Agency, Tokyo, J
Kim, Yeon-HeeKorea Meteorol. Agency, COR
Jeon, Eun-HeeKorea Meteorol. Agency, COR
Nakazawa, TetsuoMeteorol. Research Inst., Tsukuba, J
Aberson, SimHRD, Miami, FL, USA
Datum:2011
Erschienen in:Monthly Weather Review
Referierte Publikation:Ja
In Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:139
DOI :10.1175/2010MWR3377.1
Seitenbereich:Seiten 908-920
Status:veröffentlicht
Stichwörter:observation targeting, dropsonde, data assimilation, observation impact
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erdbeobachtung
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):R - Vorhaben ADM (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Lidar
Hinterlegt von: Martin Weissmann
Hinterlegt am:22 Nov 2010 14:48
Letzte Änderung:12 Dez 2013 21:05

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