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Interannual Variability of Equatorial Eastern Indian Ocean Upwelling: Local versus Remote Forcing*
Chen, Gengxin; Han, Weiqing; Li, Yuanlong; Wang, Dongxiao; Chen, GX (reprint author), Chinese Acad Sci, State Key Lab Trop Oceanog, South China Sea Inst Oceanol, 164 West Xingang Rd, Guangzhou 510301, Guangdong, Peoples R China.
2016
Source PublicationJOURNAL OF PHYSICAL OCEANOGRAPHY
Volume46Issue:3Pages:789-807
AbstractThe equatorial eastern Indian Ocean (EIO) upwelling occurs in the Indian Ocean warm pool, differing from the equatorial Pacific and Atlantic upwelling that occurs in the cold tongue. By analyzing observations and performing ocean model experiments, this paper quantifies the remote versus local forcing in causing interannual variability of the equatorial EIO upwelling from 2001 to 2011 and elucidates the associated processes. For all seasons, interannual variability of thermocline depth in the EIO, as an indicator of upwelling, is dominated by remote forcing from equatorial Indian Ocean winds, which drive Kelvin waves that propagate along the equator and subsequently along the Sumatra-Java coasts. Upwelling has prominent signatures in sea surface temperature (SST) and chlorophyll-a concentration but only in boreal summer-fall (May-October). Local forcing plays a larger role than remote forcing in producing interannual SST anomaly (SSTA). During boreal summer-fall, when the mean thermocline is relatively shallow, SSTA is primarily driven by the upwelling process, with comparable contributions from remote and local forcing effects. In contrast, during boreal winter-spring (November-April), when the mean thermocline is relatively deep, SSTA is controlled by surface heat flux and decoupled from thermocline variability. Advection affects interannual SSTA in all cases. The remote and local winds that drive the interannual variability of the equatorial EIO upwelling are closely associated with Indian Ocean dipole events and to a lesser degree with El Nino-Southern Oscillation.
Department[Chen, Gengxin; Wang, Dongxiao] Chinese Acad Sci, State Key Lab Trop Oceanog, South China Sea Inst Oceanol, 164 West Xingang Rd, Guangzhou 510301, Guangdong, Peoples R China; [Chen, Gengxin; Han, Weiqing; Li, Yuanlong] Univ Colorado, Dept Atmospher & Ocean Sci, Boulder, CO 80309 USA ; LTO
KeywordWind Stress Upwelling/downwelling Circulation/ Dynamics Ocean Dynamics Kelvin Waves
Subject AreaOceanography
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/15559
Collection热带海洋环境国家重点实验室(LTO)
Corresponding AuthorChen, GX (reprint author), Chinese Acad Sci, State Key Lab Trop Oceanog, South China Sea Inst Oceanol, 164 West Xingang Rd, Guangzhou 510301, Guangdong, Peoples R China.
Recommended Citation
GB/T 7714
Chen, Gengxin,Han, Weiqing,Li, Yuanlong,et al. Interannual Variability of Equatorial Eastern Indian Ocean Upwelling: Local versus Remote Forcing*[J]. JOURNAL OF PHYSICAL OCEANOGRAPHY,2016,46(3):789-807.
APA Chen, Gengxin,Han, Weiqing,Li, Yuanlong,Wang, Dongxiao,&Chen, GX .(2016).Interannual Variability of Equatorial Eastern Indian Ocean Upwelling: Local versus Remote Forcing*.JOURNAL OF PHYSICAL OCEANOGRAPHY,46(3),789-807.
MLA Chen, Gengxin,et al."Interannual Variability of Equatorial Eastern Indian Ocean Upwelling: Local versus Remote Forcing*".JOURNAL OF PHYSICAL OCEANOGRAPHY 46.3(2016):789-807.
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