The Indo-Pacific Warm Pool Dipole and Its Impact on the MJO Propagation
Lei Zhang
Postdoc Research Associate, CU Department of Atmospheric and Oceanic Sciences
Thursday, Sep 12, 2019, 11:00 am
DSRC Room 1D403
Abstract
A new climate mode of the Indo-Pacific interannual variability is identified, which is associated with out-of-phase sea surface temperature (SST) anomalies between the southeast Indian Ocean and the western-central tropical Pacific. Because of the close proximity of the associated SST anomalies to the tropical Indo-Pacific warm pool, this mode is dubbed the “Warm Pool Dipole” (WPD). Formation of the WPD is associated with interbasin interactions through the Indonesian throughflow and the atmospheric teleconnection.
The WPD is centered by the Maritime Continent (MC) and peaks in boreal winter, which enables it to strongly influence the Madden-Julian Oscillation (MJO). We find that during the positive phase of the WPD (Indian Ocean warming–Pacific cooling), 75% of the MJOs are stalled over the MC, while only 10% are stalled during the negative phase. The WPD impact on the MJO is through changing the large-scale vertical motions and the low-level moisture distributions. These results are robust to cross-data differences and confirmed by numerical experiments using an atmosphere model.
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