Movement, drivers and bimodality of the South Asian High

Nützel, Matthias und Dameris, Martin und Garny, Hella (2016) Movement, drivers and bimodality of the South Asian High. Atmospheric Chemistry and Physics (16), Seiten 14755-14774. Copernicus Publications. doi: 10.5194/acp-16-14755-2016. ISSN 1680-7316.

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Kurzfassung

Using seven reanalyses, we study the movement and drivers of the upper tropospheric–lower stratospheric anticyclone (AC) that forms during the Asian summer monsoon and is debated to be an important pathway for air masses to the stratosphere. We find that the distribution of the AC's centre position, and especially the so-called bimodality, largely depends on the reanalysis. Furthermore, we can connect shifts of the AC to precipitation and convection anomalies over India and the western Pacific.

elib-URL des Eintrags:

https://elib.dlr.de/108422/

Dokumentart:

Zeitschriftenbeitrag

Zusätzliche Informationen:

Abstract. The South Asian High (SAH) is an important component of the summer monsoon system in Asia. In this study we investigate the location and drivers of the SAH at 100 hPa during the boreal summers of 1979 to 2014 on interannual, seasonal and synoptic timescales using seven reanalyses and observational data. Our comparison of the different reanalyses focuses especially on the bimodality of the SAH, i.e. the two preferred modes of the SAH centre location: the Iranian Plateau to the west and the Tibetan Plateau to the east. We find that only the National Centers for Environmental Prediction–National Center of Atmospheric Research (NCEP–NCAR) reanalysis shows a clear bimodal structure of the SAH centre distribution with respect to daily and pentad (5 day) mean data. Furthermore, the distribution of the SAH centre location is highly variable from year to year. As in simple model studies, which connect the SAH to heating in the tropics, we find that the mean seasonal cycle of the SAH and its centre are dominated by the expansion of convection in the South Asian region (70–130° E  ×  15–30° N) on the south-eastern border of the SAH. A composite analysis of precipitation and outgoing long-wave radiation data with respect to the location of the SAH centre reveals that a more westward (eastward) location of the SAH is related to stronger (weaker) convection and rainfall over India and weaker (stronger) precipitation over the western Pacific.

Titel:

Movement, drivers and bimodality of the South Asian High

Autoren:

Autoren	Institution oder E-Mail-Adresse	Autoren-ORCID-iD	ORCID Put Code
Nützel, Matthias	DLR, IPA	NICHT SPEZIFIZIERT	NICHT SPEZIFIZIERT
Dameris, Martin	DLR, IPA	NICHT SPEZIFIZIERT	NICHT SPEZIFIZIERT
Garny, Hella	DLR, IPA	NICHT SPEZIFIZIERT	NICHT SPEZIFIZIERT

Datum:

25 November 2016

Erschienen in:

Atmospheric Chemistry and Physics

Referierte Publikation:

Open Access:

Gold Open Access:

In SCOPUS:

In ISI Web of Science:

DOI:

10.5194/acp-16-14755-2016

Seitenbereich:

Seiten 14755-14774

Verlag:

Copernicus Publications

ISSN:

1680-7316

Status:

veröffentlicht

Stichwörter:

SAH, bimodality, movement, drivers, Asian summer monsoon

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 - Atmosphären- und Klimaforschung

Standort:

Oberpfaffenhofen

Institute & Einrichtungen:

Institut für Physik der Atmosphäre > Erdsystem-Modellierung

Hinterlegt von:

Nützel, Matthias

Hinterlegt am:

28 Nov 2016 12:56

Letzte Änderung:

14 Nov 2023 12:44

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