DOI: 10.1007/s00382-014-2227-0
Scopus记录号: 2-s2.0-84939890658
论文题名: State of the tropical Pacific Ocean and its enhanced impact on precipitation over East Asia during marine isotopic stage 13
作者: Karami M.P. ; Herold N. ; Berger A. ; Yin Q.Z. ; Muri H.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2014
卷: 44, 期: 2017-03-04 起始页码: 807
结束页码: 825
语种: 英语
英文关键词: East Asian summer monsoon
; ENSO
; MIS-13
; Paleoclimate modeling
; Teleconnection
英文摘要: Multiple terrestrial records suggest that marine isotopic stage 13 (MIS-13), an interglacial period approximately 0.5 million years ago, had the strongest East Asian summer monsoon (EASM) of the last one million years. This is unexpected given that, compared to other interglacials, MIS-13 was globally cooler with a lower CO2 concentration. We use two coupled atmosphere–ocean general circulation models, the Hadley Centre Coupled Model, version 3 (HadCM3) and Community Climate System Model, version 3.0 (CCSM3), to simulate the climate of MIS-13 forced with different insolation and greenhouse gas concentrations relative to the pre-industrial (PrI) situation. Both models confirm a stronger EASM during MIS-13 compared to PrI. Here we specially focus on analyzing the impact of the tropical Pacific Ocean on the EASM. Our simulations suggest that the mean climatic state in the tropical Pacific during MIS-13 was La Niña-like and that associated teleconnections with the extra-tropics favored increased precipitation over the EASM. As compared to PrI, it is found that the summer (June–July–August) sea surface temperature (SST) is warmer in the eastern tropical Pacific Ocean and colder to the west. In concert with previous studies, we show that colder summer SSTs in the central tropical Pacific during MIS-13 promotes an upper-level teleconnection between the tropical Pacific Ocean and EASM. It also contributes to the strengthening of the northern Pacific subtropical high and, therefore, the transport of more moisture into the EASM. We suggest that the reduced east–west SST difference in the tropical Pacific in summer helps to maintain the teleconnection between the tropical Pacific and EASM. The correlation between tropical Pacific SSTs and the EASM was higher in our MIS-13 simulations, further supporting the enhancement of their relationship. It is found that the pure impact of El Niño Southern Oscillation on EASM precipitation increases by up to 30 % in MIS-13 for HadCM3 while it is minor for CCSM3. Better constraining the spatio-temporal variability of tropical Pacific SST during the interglacials may thus help explain the anomalously strong EASM during MIS-13 which has been observed from geological records. © 2014, Springer-Verlag Berlin Heidelberg. 资助项目: ERC, European Research Council
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54658
Appears in Collections: 过去全球变化的重建
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作者单位: Georges Lemaître Centre for Earth and Climate Research (TECLIM), Earth and Life Institute (ELI), Université Catholique de Louvain, Place Louise Pasteur 3, Box L4.03.08, Louvain-La-Neuve, Belgium; Geotop, Université du Québec à Montréal (UQAM), Montreal, Canada; Institute for the Study of Earth, Oceans and Space, University of New Hampshire, Durham, NH, United States; Department of Geosciences, Meteorology and Oceanography Section, University of Oslo, Blindern, Postboks 1022, Oslo, Norway
Recommended Citation:
Karami M.P.,Herold N.,Berger A.,et al. State of the tropical Pacific Ocean and its enhanced impact on precipitation over East Asia during marine isotopic stage 13[J]. Climate Dynamics,2014-01-01,44(2017-03-04)