The East Asian Summer Monsoon in pacemaker experiments driven by ENSO

Ding, Hui, Greatbatch, Richard John, Lu, Jian and Cash, Ben (2015) The East Asian Summer Monsoon in pacemaker experiments driven by ENSO Ocean Dynamics, 65 . pp. 385-393. DOI 10.1007/s10236-014-0795-5.

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The variability of the East Asian summer monsoon (EASM) is studied using a pacemaker technique driven by ENSO in an atmospheric general circulation model (AGCM) coupled to a slab mixed layer model. In the pacemaker experiments, sea surface temperature (SST) is constrained to observations in the eastern equatorial Pacific through a q-flux that measures the contribution of ocean dynamics to SST variability, while the AGCM is coupled to the slab model. An ensemble of pacemaker experiments is analyzed using a multivariate EOF analysis to identify the two major modes of variability of the EASM. The results show that the pacemaker experiments simulate a substantial amount (around 45 %) of the variability of the first mode (the Pacific-Japan pattern) in ERA40 from 1979 to 1999. Different from previous work, the pacemaker experiments also simulate a large part (25 %) of the variability of the second mode, related to rainfall variability over northern China. Furthermore, we find that the lower (850 hPa) and the upper (200 hPa) tropospheric circulation of the first mode display the same degree of reproducibility whereas only the lower part of the second mode is reproducible. The basis for the success of the pacemaker experiments is the ability of the experiments to reproduce the observed relationship between El Niño Southern Oscillation (ENSO) and the EASM.

Document Type: Article
Additional Information: WOS:000350481400006
Keywords: East Asian Summer Monsoon; Pacemaker; ENSO
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-TM Theory and Modeling
Kiel University
Refereed: Yes
DOI etc.: 10.1007/s10236-014-0795-5
ISSN: 1616-7341
Date Deposited: 19 Jan 2015 13:17
Last Modified: 13 Apr 2017 08:17

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