IOCAS-IR  > 海洋环流与波动重点实验室
Separating freshwater flux effects on ENSO in a hybrid coupled model of the tropical Pacific
Gao, Chuan1,2,3,4; Zhang, Rong-Hua1,2,3,4; Karnauskas, Kristopher B.5,6; Zhang, Lei5; Tian, Feng1,2,3,4
2020-04-24
Source PublicationCLIMATE DYNAMICS
ISSN0930-7575
Pages22
Corresponding AuthorZhang, Rong-Hua(rzhang@qdio.ac.cn)
AbstractFreshwater flux (FWF) at the sea surface, defined as precipitation minus evaporation, is a major atmospheric forcing to the ocean that affects sea surface salinity (SSS) and buoyancy flux (Q(B)). Physically, there exist two pathways through which interannual FWF variability can affect the ocean: one through SSS and the other through Q(B). The roles of the interannual FWF variability in modulating the El Nino-Southern Oscillation (ENSO) through its effects on SSS or Q(B) are separately examined using a hybrid coupled model (HCM) of the tropical Pacific; its ocean component is a layer model in which the topmost layer (the first layer) is treated as a mixed layer (ML) whose depth (H-m) is explicitly predicted using an embedded bulk ML model with H-m being directly affected by Q(B), whereas in level ocean models, Q(B) does not have a direct and explicit effect on H-m. Four experiments are conducted using the HCM that is designed to illustrate the effects of these processes on coupled simulations systematically. It is demonstrated that interannual FWF variability serves as a positive feedback on ENSO through its collective effects on both SSS and Q(B). Individually, the interannual FWF effect through SSS accounts for about 80% in terms of ENSO amplitude in the Nino 3.4 area, while that through buoyancy flux accounts for about 26%. This indicates that ocean models without explicitly taking into account the direct FWF effect on Q(B) (typically in level ocean models) could underestimate the positive feedback on ENSO compared with layer ocean models in which the FWF effects are collectively represented on both SSS and Q(B). Further implications for model biases associated with FWF effects are discussed.
KeywordFreshwater flux effects Sea surface salinity Buoyancy flux Feedbacks on ENSO Layer and level ocean models
DOI10.1007/s00382-020-05245-y
Indexed BySCI
Language英语
Funding ProjectNational Key Research and Development Program of China[2017YFC1404102(2017YFC1404100)] ; National Natural Science Foundation of China[41705082] ; National Natural Science Foundation of China[41690122(41690120)] ; National Natural Science Foundation of China[41421005] ; NSFC-Shandong Joint Fund for Marine Science Research Centers[U1406402] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA19060102] ; Taishan Scholarship
WOS Research AreaMeteorology & Atmospheric Sciences
WOS SubjectMeteorology & Atmospheric Sciences
WOS IDWOS:000528435500002
PublisherSPRINGER
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/167308
Collection海洋环流与波动重点实验室
Corresponding AuthorZhang, Rong-Hua
Affiliation1.Chinese Acad Sci, Inst Oceanol, CAS Key Lab Ocean Circulat & Waves, Qingdao 266071, Peoples R China
2.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao 266071, Peoples R China
3.Pilot Natl Lab Marine Sci & Technol, Qingdao 266237, Peoples R China
4.Univ Chinese Acad Sci, Beijing 10029, Peoples R China
5.Univ Colorado, Dept Atmospher & Ocean Sci, Boulder, CO 80309 USA
6.Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences;  Center for Ocean Mega-Science, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences;  Center for Ocean Mega-Science, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Gao, Chuan,Zhang, Rong-Hua,Karnauskas, Kristopher B.,et al. Separating freshwater flux effects on ENSO in a hybrid coupled model of the tropical Pacific[J]. CLIMATE DYNAMICS,2020:22.
APA Gao, Chuan,Zhang, Rong-Hua,Karnauskas, Kristopher B.,Zhang, Lei,&Tian, Feng.(2020).Separating freshwater flux effects on ENSO in a hybrid coupled model of the tropical Pacific.CLIMATE DYNAMICS,22.
MLA Gao, Chuan,et al."Separating freshwater flux effects on ENSO in a hybrid coupled model of the tropical Pacific".CLIMATE DYNAMICS (2020):22.
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