A multi-model analysis of the role of the ocean on the African and Indian monsoon during the mid-Holocene

Y Zhao, P Braconnot, SP Harrison, O Marti, C Hewitt, Z Kitoh, Z Liu, U Mikolajewicz, SL Otto-Bliesner, SL Weber

Research output: Contribution to journalArticle (Academic Journal)

76 Citations (Scopus)

Abstract

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.
Translated title of the contributionA multi-model analysis of the role of the ocean on the African and Indian monsoon during the mid-Holocene
Original languageEnglish
Pages (from-to)777 - 800
Number of pages24
JournalClimate Dynamics
Volume25
DOIs
Publication statusPublished - 2005

Bibliographical note

Publisher: Netherlands : SPRINGER VERLAG KG

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    Zhao, Y., Braconnot, P., Harrison, SP., Marti, O., Hewitt, C., Kitoh, Z., Liu, Z., Mikolajewicz, U., Otto-Bliesner, SL., & Weber, SL. (2005). A multi-model analysis of the role of the ocean on the African and Indian monsoon during the mid-Holocene. Climate Dynamics, 25, 777 - 800. https://doi.org/10.1007/s00382-005-0075-7