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


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.


You must provide an accepted form of identification at the Visitor Center to obtain a vistor badge. Security personnel also inspect vehicles prior to entrance of the site. Please allow extra time for these procedures.

After receiving a badge, you must arrive at the DSRC Lobby at least 5 minutes before the seminar starts to meet your security escort. If you arrive after that time, you will not be allowed entry.

Foreign Nationals: Please email the seminar contact at least 48 hours prior to the seminar to provide additional information required for security purposes.

Seminar Contact: