Intraseasonal variability of the Kuroshio observed via mooring at 18°N  

作　　者：Xin YUAN Qingye WANG Jie MA Shijian HU Dunxin HU 

机构地区：[1]Key Laboratory of Ocean Circulation and Waves,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Laoshan Laboratory,Qingdao 266237,China [4]Center for Ocean Mega-Science,Chinese Academy of Sciences,Qingdao 266071,China

出　　处：《Journal of Oceanology and Limnology》2024年第2期468-483,共16页海洋湖沼学报（英文）

基　　金：Supported by the National Natural Science Foundation of China(Nos.41976011,42022040);the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDB42010102);the Shandong Provincial Natural Science Foundation(No.ZR2020JQ18);Shijian HU is a member of the CAS Interdisciplinary Innovation Team(No.JCTD2020-12)。

摘　　要：Insufficient observations near the origin of the Kuroshio have led to incomplete understanding of the intraseasonal variability(ISV)of the Kuroshio.Direct measurements of the Kuroshio velocity were performed with an array of three profiler moorings(122.7°E,123°E,and 123.3°E)along 18°N from January 2018 to February 2020.The ISV of the Kuroshio at 18°N was investigated based on a combination of mooring observations and global high-resolution HYbrid Coordinate Ocean Model reanalysis data.The estimated time-averaged transport in the upper 350 m across the observation transect was 6.5±2.6 Sv(1.0 Sv=10^(6)m^(3)/s).Two significant ISV peaks at 50-60 and~100 d were recognized in the power spectra of the meridional velocity and transport.Further analysis indicated that the ISV at 50-60 d was caused by westward-propagating eddies at average propagation speed of~13 cm/s and wavelength of~635 km.Another ISV peak at~100 d was mainly caused by northward-propagating eddies generated in the North Equatorial Current region.Further investigation indicated that the ISV of the Kuroshio at 18°N is dominated by meridional transport,rather than by the zonal migration of the Kuroshio main axis.Our findings provide a better understanding of the ISV of the Kuroshio east of Luzon Island.

关 键 词：intraseasonal variability(ISV) KUROSHIO mooring observation EDDY 

分 类 号：P714[天文地球—海洋科学] P731.27