IOCAS-IR  > 海洋环流与波动重点实验室
Decadal Variations of the Mindanao Current During 1960-2010
Duan, Jing1,2,3; Li, Yuanlong1,2,3; Wang, Fan1,2,3; Chen, Zhaohui3,4
2019-04-01
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
ISSN2169-9275
Volume124Issue:4Pages:2660-2678
Corresponding AuthorWang, Fan(fwang@qdio.ac.cn)
AbstractResults from an eddy-resolving ocean model simulation, an ocean reanalysis data, and reduced-gravity ocean (RGO) model simulations reach consensus in suggesting prominent decadal fluctuations of the Mindanao Current (MC) during 1960-2010. The MC was evidently enhanced during 1974-1982 and 2002-2008 and weakened during 1983-1990 and 1994-2001, with typical amplitude of similar to 2.0Sv (1Sv10(6)m(3)/s) for decadal volume transport anomaly. These variations are closely associated with the strength of the westward flowing North Equatorial Current at 130 degrees E and not evidently related with its bifurcation latitude. Experiments using a 1.5-layer RGO model are performed to understand the mechanisms. Decadal variations of the MC are primarily caused by off-equatorial wind changes in the tropical North Pacific, and winds in the latitude range of the MC (3-13 degrees N) play the dominant role. Equatorial winds between 3 degrees S and 3 degrees N generally act to attenuate the MC variability, and subtropical winds have little contribution. For zonal distribution, local wind forcing between 120 and 160 degrees E explains 67.8% of the MC decadal variability, while those in the central and eastern Pacific have weaker effects (25.0% and 7.2%, respectively). RGO model runs forced by nine wind data sets confirm the tight relationship between the MC and the western Pacific winds since the 1980s. The anomalous westerly winds under El Nino-like condition drive upwelling in the Philippine Sea through off-equatorial Ekman pumping that strengthens the MC. The relationship prior to 1980 is sensitive to the choice of wind data set, with four data sets yielding low or negative correlations. Plain Language Summary The Mindanao Current (MC) is important in supplying water to the western Pacific warm pool and the Indonesian Throughflow. The MC variabilities on seasonal and interannual time scales have been intensively investigated, whereas decadal variability of the MC was rarely explored. In this study, we used ocean model simulations and ocean reanalysis data to explore the decadal variability of the MC during 1960-2010 and the underlying causes. It is found that the MC was stronger during 1974-1982 and 2002-2008 and weaker during 1983-1990 and 1994-2001. The typical amplitude is similar to 2.0Sv (1Sv10(6)m(3)/s). We also found that wind forcing in the tropical northwest Pacific region is most important in controlling the MC transport. These variations are largely determined by the strength of the North Equatorial Current at 130 degrees E rather than the North Equatorial Current's bifurcation latitude off the Philippine coast. Subtropical wind forcing north of 23 degrees N has little contribution, whereas equatorial winds between 3 degrees S and 3 degrees N generally act to attenuate the MC variability. A tight relationship is found between the MC and the western Pacific zonal winds in decadal variability, particularly after similar to 1980. By contrast, the correlation between the MC and El Nino-Southern Oscillation is low on decadal time scale.
DOI10.1029/2019JC014975
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China (NSFC)[41806014] ; National Natural Science Foundation of China (NSFC)[41730534] ; National Natural Science Foundation of China (NSFC)[41776001] ; National Natural Science Foundation of China (NSFC)[41806001] ; National Natural Science Foundation of China (NSFC)[41622602] ; AoShan Talents Program[2017ASTCP-ES05]
WOS Research AreaOceanography
WOS SubjectOceanography
WOS IDWOS:000467950800022
PublisherAMER GEOPHYSICAL UNION
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/157052
Collection海洋环流与波动重点实验室
Corresponding AuthorWang, Fan
Affiliation1.Chinese Acad Sci, Inst Oceanol, CAS Key Lab Ocean Circulat & Waves, Qingdao, Shandong, Peoples R China
2.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao, Shandong, Peoples R China
3.Qingdao Natl Lab Marine Sci & Technol, Funct Lab Ocean Dynam & Climate, Qingdao, Shandong, Peoples R China
4.Ocean Univ China, Phys Oceanog Lab, Qingdao, Shandong, Peoples R China
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Duan, Jing,Li, Yuanlong,Wang, Fan,et al. Decadal Variations of the Mindanao Current During 1960-2010[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2019,124(4):2660-2678.
APA Duan, Jing,Li, Yuanlong,Wang, Fan,&Chen, Zhaohui.(2019).Decadal Variations of the Mindanao Current During 1960-2010.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,124(4),2660-2678.
MLA Duan, Jing,et al."Decadal Variations of the Mindanao Current During 1960-2010".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 124.4(2019):2660-2678.
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