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          Institute: MPI für Meteorologie     Collection: Ocean in the Earth System     Display Documents

ID: 256352.0, MPI für Meteorologie / Ocean in the Earth System
A multi-model analysis of the role of the ocean on the African and Indian monsoon during the mid-Holocene
Authors:Zhao, Y.; Braconnot, P.; Marti, O.; Harrison, S. P.; Hewitt, C.; Kitoh, A.; Liu, Z.; Mikolajewicz, Uwe; Otto-Bliesner, B.; Weber, S. L.
Date of Publication (YYYY-MM-DD):2005-12
Title of Journal:Climate Dynamics
Journal Abbrev.:Clim. Dyn.
Issue / Number:7-8
Start Page:777
End Page:800
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:We investigate the role of the ocean feedback on the climate in response to insolation forcing during the mid-Holocene (6,000 year BP) using results from seven coupled ocean–atmosphere general circulation models. We examine how the dipole in late summer sea-surface temperature (SST) anomalies in the tropical Atlantic increases the length of the African monsoon, how this dipole structure is created and maintained, and how the late summer SST warming in the northwest Indian Ocean affects the monsoon retreat in this sector. Similar mechanisms are found in all of the models, including a strong wind evaporation feedback and changes in the mixed layer depth that enhance the insolation forcing, as well as increased Ekman transport in the Atlantic that sharpens the Atlantic dipole pattern. We also consider changes in interannual variability over West Africa and the Indian Ocean. The teleconnection between variations in SST and Sahelian precipitation favor a larger impact of the Atlantic dipole mode in this region. In the Indian Ocean, the strengthening of the Indian dipole structure in autumn has a damping effect on the Indian dipole mode at the interannual time scale
External Publication Status:published
Document Type:Article
Communicated by:Carola Kauhs
Affiliations:MPI für Meteorologie
External Affiliations:CEA, CNRS, Lab Sci Climat & Environm, IPSL,Unite Mixte, F-91191 Gif Sur Yvette, France.; Univ Bristol, Sch Geog Sci, Bristol BS8 1SS, Avon, England.; Hadley Ctr Met Off, Exeter, Devon, England.; Meteorol Res Inst, Tsukuba, Ibaraki 305, Japan.; Univ Wisconsin, Madison, WI USA.; Natl Ctr Atmospher Res, Boulder, CO 80307 USA.; Royal Netherlands Meteorol Inst, NL-3730 AE De Bilt, Netherlands.
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