TY - JOUR
T1 - Interbasin effects of the Indian Ocean on Pacific decadal climate change
AU - Mochizuki, Takashi
AU - Kimoto, Masahide
AU - Watanabe, Masahiro
AU - Chikamoto, Yoshimitsu
AU - Ishii, Masayoshi
N1 - Funding Information:
The authors wish to thank H. Shiogama, S. Yasunaka, M. Mori, and Y. Imada for their support in performing the experiments. This work is supported by the SOUSEI program, the Grant-in-Aid for Scientific Research program (A-26247079), the Grant-in-Aid for Young Scientists program (B-26800253), and the National Science Foundation (1049219). The data presented in this paper can be requested from the authors for research purposes.
Publisher Copyright:
©2016. The Authors.
PY - 2016/7/16
Y1 - 2016/7/16
N2 - We demonstrate the significant impact of the Indian Ocean on the Pacific climate on decadal timescales by comparing two sets of data assimilation experiments (pacemaker experiments) conducted over recent decades. For the Indian Ocean of an atmosphere-ocean coupled global climate model, we assimilate ocean temperature and salinity anomalies defined as deviations from climatology or as anomalies with the area-averaged changes for the Indian Ocean subtracted. When decadal sea surface temperature (SST) trends are observed to be strong over the Indian Ocean, the equatorial thermocline uniformly deepens, and the model simulates the eastward tendencies of surface wind aloft. Surface winds strongly converge around the maritime continent, and the associated strengthening of the Walker circulation suppresses an increasing trend in the equatorial Pacific SST through ocean thermocline shoaling, similar to common changes associated with seasonal Indian Ocean warming.
AB - We demonstrate the significant impact of the Indian Ocean on the Pacific climate on decadal timescales by comparing two sets of data assimilation experiments (pacemaker experiments) conducted over recent decades. For the Indian Ocean of an atmosphere-ocean coupled global climate model, we assimilate ocean temperature and salinity anomalies defined as deviations from climatology or as anomalies with the area-averaged changes for the Indian Ocean subtracted. When decadal sea surface temperature (SST) trends are observed to be strong over the Indian Ocean, the equatorial thermocline uniformly deepens, and the model simulates the eastward tendencies of surface wind aloft. Surface winds strongly converge around the maritime continent, and the associated strengthening of the Walker circulation suppresses an increasing trend in the equatorial Pacific SST through ocean thermocline shoaling, similar to common changes associated with seasonal Indian Ocean warming.
UR - http://www.scopus.com/inward/record.url?scp=84978924333&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84978924333&partnerID=8YFLogxK
U2 - 10.1002/2016GL069940
DO - 10.1002/2016GL069940
M3 - Article
AN - SCOPUS:84978924333
VL - 43
SP - 7168
EP - 7175
JO - Geophysical Research Letters
JF - Geophysical Research Letters
SN - 0094-8276
IS - 13
ER -