| Multi-decadal trends in the tropical Pacific western boundary currents retrieved from historical hydrological observations |
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| 作者姓名： | Shijian HU Xi LU Shihan LI Fan WANG Cong GUAN Dunxin HU Linchao XIN Jie MA |
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| 作者单位： | CAS Key Laboratory'of Ocean Circulation and Waves;Center for Ocean Mega-Science;Pilot National Laboratory for Marine Science and Technology（Qingdao）;College of Marine Science |
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| 基金项目： | supported by the National Natural Science Foundation of China (Grant No. 41776018);the Strategic Priority Research Program of Chinese Academy of Sciences (CAS) (Grant No. XDB42010403);the National Natural Science Foundation of China (Grant No. 91858101);the Key Deployment Project of Centre for Ocean MegaResearch of Science of CAS (Grant Nos. COMS2019Q01 & COMS2019Q03);the CAS-CSIRO Project Fund (Grant No. 133244KYSB20190031);SH is a member of the Youth Innovation Promotion Association of CAS (Grant No. 2018240)。 |
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| 摘 要： | As large-scale ocean circulation is a key regulator in the redistribution of oceanic energy, evaluating the multi-decadal trends in the western Pacific Ocean circulation under global warming is essential for not only understanding the basic physical processes but also predicting future climate change in the western Pacific. Employing the hydrological observations of World Ocean Atlas 2018(WOA18) from 1955 to 2017, this study calculated the geostrophic currents, volume transport and multidecadal trends for the North Equatorial Current(NEC), the North Equatorial Countercurrent(NECC), the Mindanao Current(MC), the Kuroshio Current(KC) in the origin and the New Guinea Coastal Undercurrent(NGCUC) within tropical western Pacific Ocean over multi-decades. Furthermore, this study examined the contributions of temperature and salinity variations. The results showed significant strengthening trends in NEC, MC and NGCUC over the past six decades, which is mainly contributed by temperature variations and consistent with the tendency in the dynamic height pattern. Zonal wind stress averaged over the western Pacific Ocean in the same latitude of each current represents the decadal variation and multi-decadal trends in corresponding ocean currents, indicating that the trade wind forcing plays an important role in the decadal trend in the tropical western Pacific circulation. Uncertainties in the observed hydrological data and trends in the currents over the tropical western Pacific are also discussed. Given that the WOA18 dataset covers most of the historical hydrological sampling data for the tropical western Pacific, this paper provides important observational information on the multi-decadal trend of the large-scale ocean circulation in the western Pacific.
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| 关 键 词： | PACIFIC Western boundary current Multi-decadal trend Global variation Hydrological observation |
Multi-decadal trends in the tropical Pacific western boundary currents retrieved from historical hydrological observations |
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| Shijian HU,Xi LU,Shihan LI,Fan WANG,Cong GUAN,Dunxin HU,Linchao XIN,Jie MA.Multi-decadal trends in the tropical Pacific western boundary currents retrieved from historical hydrological observations[J].Science China Earth Sciences,2021(4):600-610. |
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| Abstract: | As large-scale ocean circulation is a key regulator in the redistribution of oceanic energy, evaluating the multi-decadal trends in the western Pacific Ocean circulation under global warming is essential for not only understanding the basic physical processes but also predicting future climate change in the western Pacific. Employing the hydrological observations of World Ocean Atlas 2018(WOA18) from 1955 to 2017, this study calculated the geostrophic currents, volume transport and multidecadal trends for the North Equatorial Current(NEC), the North Equatorial Countercurrent(NECC), the Mindanao Current(MC), the Kuroshio Current(KC) in the origin and the New Guinea Coastal Undercurrent(NGCUC) within tropical western Pacific Ocean over multi-decades. Furthermore, this study examined the contributions of temperature and salinity variations. The results showed significant strengthening trends in NEC, MC and NGCUC over the past six decades, which is mainly contributed by temperature variations and consistent with the tendency in the dynamic height pattern. Zonal wind stress averaged over the western Pacific Ocean in the same latitude of each current represents the decadal variation and multi-decadal trends in corresponding ocean currents, indicating that the trade wind forcing plays an important role in the decadal trend in the tropical western Pacific circulation. Uncertainties in the observed hydrological data and trends in the currents over the tropical western Pacific are also discussed. Given that the WOA18 dataset covers most of the historical hydrological sampling data for the tropical western Pacific, this paper provides important observational information on the multi-decadal trend of the large-scale ocean circulation in the western Pacific. |
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