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

Y. Zhao, Pascale Braconnot*, O. Marti, S. P. Harrison, C. Hewitt, A. Kitoh, Z. Liu, U. Mikolajewicz, B. Otto-Bliesner, S. L. Weber

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    86 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.

    Original languageEnglish
    Pages (from-to)777-800
    Number of pages24
    JournalClimate Dynamics
    Volume25
    Issue number7-8
    DOIs
    Publication statusPublished - Dec 2005

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