气候变化领域集成服务门户(CCPortal): Impacts of the indian ocean dipole on sea level and gyre circulation of the western tropical pacific ocean

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DOI	10.1175/JCLI-D-19-0782.1
	Impacts of the indian ocean dipole on sea level and gyre circulation of the western tropical pacific ocean
	Duan J.; Yuanlong L.I.; Zhang L.; Wang F.
发表日期	2020
ISSN	0894-8755
起始页码	4207
结束页码	4228
卷号	33 期号:10
英文摘要	Interannual variabilities of sea level and upper-ocean gyre circulation of the western tropical Pacific Ocean (WTPO) have been predominantly attributed to El Niño-Southern Oscillation (ENSO). The results of the present study put forward important modulation effects by the Indian Ocean dipole (IOD) mode. The observed sea level in the WTPO shows significant instantaneous and lagged correlations (around 20.60 and 0.40, respectively) with the IOD mode index (DMI). A composite of 14 ''independent'' IOD events for 1958-2017 shows negative sea level anomalies (SLAs) of 4-7 cm in the WTPO during positive IOD events and positive SLAs of 6-8 cm in the following year that are opposite in sign to the El Niño effect. The IOD impacts are reproduced by large-ensemble simulations of a climate model that generate respectively 430 and 519 positive and negative independent IOD events. A positive IOD induces westerly winds over the western and central tropical Pacific and causes negative SLAs through Ekman upwelling, and it facilitates the establishment of a La Niña condition in the following year that involves enhanced Pacific trade winds and causes positive SLAs in the WTPO. Ocean model experiments confirm that the IOD affects the WTPO sea level mainly through modulating the tropical Pacific winds. Variability of the Indonesian Throughflow (ITF) induced by IOD winds has a relatively weak effect on the WTPO. The IOD's impacts on the major upper-ocean currents are also considerable, causing anomalies of 1-4 Sv (1 Sv [ 106 m3 s21) in the South Equatorial Current (SEC) and North Equatorial Countercurrent (NECC) volume transports. © 2020 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy (www.ametsoc.org/PUBSReuseLicenses).
英文关键词	Atmospheric pressure; Climate models; Climatology; Ocean currents; Tropics; Wind; Indian ocean dipoles; Indonesian throughflow; Interannual variability; North equatorial countercurrent; South equatorial currents; Southern oscillation; Tropical Pacific ocean; Tropical pacific wind; Sea level; air-sea interaction; annual variation; climate modeling; El Nino-Southern Oscillation; ensemble forecasting; gyre; Indian Ocean Dipole; La Nina; sea level; trade wind; volume transport; North Equatorial Current; Pacific Ocean; Pacific Ocean (Tropical); Pacific Ocean (West); South Equatorial Current
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171305
作者单位	CAS Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences, Function Laboratory for Ocean Dynamics and Climate, Qingdao National Laboratory for Marine Science and Technology, Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, China; Department of Atmospheric and Oceanic Sciences, University of Colorado Boulder, Boulder, CO, United States
推荐引用方式 GB/T 7714	Duan J.,Yuanlong L.I.,Zhang L.,et al. Impacts of the indian ocean dipole on sea level and gyre circulation of the western tropical pacific ocean[J],2020,33(10).
APA	Duan J.,Yuanlong L.I.,Zhang L.,&Wang F..(2020).Impacts of the indian ocean dipole on sea level and gyre circulation of the western tropical pacific ocean.Journal of Climate,33(10).
MLA	Duan J.,et al."Impacts of the indian ocean dipole on sea level and gyre circulation of the western tropical pacific ocean".Journal of Climate 33.10(2020).