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On the late northward propagation of the West African monsoon in summer 2006 in the region of Niger/Mali

Drobinski, P. und Bastin, S. und Janicot, S. und Bock, O. und Dabas, A. und Delville, P. und Reitebuch, O. und Sultan, B. (2009) On the late northward propagation of the West African monsoon in summer 2006 in the region of Niger/Mali. Journal of Geophysical Research, 114 (D09108), Seiten 1-16. DOI: 10.1029/2008JD011159.

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Offizielle URL: http://www.agu.org/pubs/crossref/2009/2008JD011159.shtml

Kurzfassung

This paper investigates the fine-scale dynamical processes at the origin of the late northward migration of the monsoon flow in summer 2006 in the region of Niger and Mali (onset on 3 July 2006 compared to the climatological onset date, 24 June). Compared to a 28-year climatology, 2006 NCEP-2 reanalyses show evidence of an anomalous pattern during 10 days between 25 June and 3 July 2006, characterized by the African Easterly Jet (AEJ) blowing from the northeast along a narrow northeast/southwest band located over the Hoggar and Air mountains associated with an unusually strong northeasterly harmattan in the lee of the mountains. Using data collected during the African Monsoon Multidisciplinary Analysis (AMMA) experiment and mesoscale numerical simulations, this study shows evidence of interaction between the AEJ and the orography supported by the reduced gravity shallow water theory which explains the enhancement of the harmattan downstream of the Hoggar and Air mountains in summer 2006. The enhanced harmattan contributes to move southward the intertropical discontinuity (ITD) defined as the interface between the cool moist southwesterly monsoon flow and the warm dry harmattan. Finally, an interaction between the ITD and African Easterly waves contributes to propagate the ITD southward retreat about 1500 km to the west of the Hoggar and Air mountains.

Dokumentart:Zeitschriftenbeitrag
Titel:On the late northward propagation of the West African monsoon in summer 2006 in the region of Niger/Mali
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Drobinski, P.CNRS, Palaiseau, F
Bastin, S.CNRS, Palaiseau, F
Janicot, S.CNRS, Palaiseau, F
Bock, O.CNRS, Palaiseau, F
Dabas, A.Météo-France, Toulouse, F
Delville, P.CNRS, Meudon, F
Reitebuch, O.NICHT SPEZIFIZIERT
Sultan, B.CNRS, Paris, F
Datum:2009
Erschienen in:Journal of Geophysical Research
Referierte Publikation:Ja
In Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:114
DOI :10.1029/2008JD011159
Seitenbereich:Seiten 1-16
Status:veröffentlicht
Stichwörter:Monsoon, AMMA, Doppler lidar WIND
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 - Projekt ADM II (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Lidar
Hinterlegt von: Oliver Reitebuch
Hinterlegt am:22 Jul 2009 14:40
Letzte Änderung:23 Jan 2014 11:36

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