Publication Date:
2021-05-19
Description:
In this study we show a teleconnection pattern relating Outgoing Longwave Radiation (OLR)
anomalies over the western Pacific Ocean and sea surface temperature anomalies (SSTA) over
the western Indian Ocean over two seasons (Sept-Oct-Nov and Dec-Jan-Feb) at zero lag from
observations and atmospheric general circulation model (AGCM) integrations. This teleconnection
pattern suggests that a positive SSTA in Sept-Oct-Nov (SON) and Dec-Jan-Feb (DJF) seasons
over the western Indian Ocean increases the contemporaneous positive OLR anomalies over the
western Pacific Ocean. This teleconnection pattern is also simulated by the Center for Ocean-Land-
Atmosphere studies (COLA) AGCM forced with observed SST’s. From the experimental COLA
AGCM runs (wherein the Pacific Ocean SST variability is suppressed except for the climatological
annual cycle) it is diagnosed that the interannual variability of OLR over the western Pacific Ocean
persists because of this teleconnection. In relation to this teleconnection pattern it is shown that
there is a significant linear response of the SON and DJF equatorial zonal wind anomaly over the
Pacific Ocean to contemporaneous SSTA over the western Indian Ocean which is comparable to
that of the eastern and western Pacific Oceans. The experimental AGCM runs clearly show that
this response of the equatorial zonal wind anomaly to the western Indian Ocean forcing shifts
westward towards the Indian Ocean in the absence of Pacific SST variability.
Description:
Published
Keywords:
Sea surface temperature
;
Atmospheric conditions
;
Teleconnections
Repository Name:
AquaDocs
Type:
Journal Contribution
,
Refereed
,
Article
Format:
759939 bytes
Format:
application/pdf
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