Decadal to multi-decadal scale variability of Indian summer monsoon rainfall in the coupled ocean-atmosphere-chemistry climate model SOCOL-MPIOM

Malik, Abdul; Brönnimann, Stefan; Stickler, Alexander Nicolas; Raible, Christoph; Muthers, Stefan; Anet, Julien; Rozanov, Eugene; Schmutz, Werner (2017). Decadal to multi-decadal scale variability of Indian summer monsoon rainfall in the coupled ocean-atmosphere-chemistry climate model SOCOL-MPIOM. Climate dynamics, 49(9-10), pp. 3551-3572. Springer 10.1007/s00382-017-3529-9

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The present study is an effort to deepen the understanding of Indian summer monsoon rainfall (ISMR) on decadal to multi-decadal timescales. We use ensemble simulations for the period AD 1600–2000 carried out by the coupled Atmosphere-Ocean-Chemistry-Climate Model (AOCCM) SOCOL-MPIOM. Firstly, the SOCOL-MPIOM is evaluated using observational and reanalyses datasets. The model is able to realistically simulate the ISMR as well as relevant patterns of sea surface temperature and atmospheric circulation. Further, the influence of Atlantic Multi-decadal Oscillation (AMO), Pacific Decadal Oscillation (PDO), and El Niño Southern Oscillation (ENSO) variability on ISMR is realistically simulated. Secondly, we investigate the impact of internal climate variability and external climate forcings on ISMR on decadal to multi-decadal timescales over the past 400 years. The results show that AMO, PDO, and Total Solar Irradiance (TSI) play a considerable role in controlling the wet and dry decades of ISMR. Resembling observational findings most of the dry decades of ISMR occur during a negative phase of AMO and a simultaneous positive phase of PDO. The observational and simulated datasets reveal that on decadal to multi-decadal timescales the ISMR has consistent negative correlation with PDO whereas its correlation with AMO and TSI is not stationary over time.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geography > Physical Geography > Unit Climatology
08 Faculty of Science > Physics Institute > Climate and Environmental Physics
10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Institute of Geography
08 Faculty of Science > Institute of Geography > Physical Geography
08 Faculty of Science > Physics Institute

UniBE Contributor:

Malik, Abdul; Brönnimann, Stefan; Stickler, Alexander Nicolas; Raible, Christoph and Muthers, Stefan

Subjects:

500 Science > 530 Physics
900 History > 910 Geography & travel
500 Science > 550 Earth sciences & geology

ISSN:

0930-7575

Publisher:

Springer

Language:

English

Submitter:

Monika Wälti-Stampfli

Date Deposited:

19 Apr 2017 13:32

Last Modified:

01 Nov 2017 01:30

Publisher DOI:

10.1007/s00382-017-3529-9

BORIS DOI:

10.7892/boris.95737

URI:

https://boris.unibe.ch/id/eprint/95737

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