Distribution, movement and generation mechanism of the mesoscale eddy around the Kuroshio in the East China Sea

doi:10.3969j.issn.1001-909X.2022.04.001

Abstract

Abstract: In order to explore the distribution, formation mechanism and motion law of eddy around Kuroshio in East China Sea, firstly, the eddy distribution around the Kuroshio in the East China Sea during the past 27 years was analyzed by using the mesoscale eddy data set of the AVISO(Archiving, Validation and Interpretation of Satellite Oceanographic Data). The results show that there are 650 eddies generated in the meander of the Kuroshio, and 271 eddies in the middle part of the Kuroshio. The diameters of the most these eddies were between 100 to 150 km, and the amplitudes were between 2 to 6 cm. Secondly, the motion path and eddy motion process of the Kuroshio in the East China Sea are also analyzed. The results show these the cyclonic eddies are easy to be generated in the inner side of the Kuroshio cyclonic bend, with a long path. For example, at the cyclone bend of the Kuroshio axis in the northeast of Taiwan, the average length of the path was 87.6 km. Otherwise, when these anticyclonic eddies are generated, these eddies usually are wandered. In the middle part of the Kuroshio, the eddy showed the polar symmetric distribution characteristics of these cyclonic eddies in the west side of the Kuroshio main axis and these anticyclonic eddies in the east side of the Kuroshio main axis. Both types of eddies moved northeastward along the Kuroshio main axis. Finally, combined with reanalysis data sets of ocean current and sea surface height, the eddy motion law and generation mechanism were discussed. It is concluded that these eddies generation at the curve of the Kuroshio are related to the separation of the boundary layer of the Kuroshio fluid. The Kuroshio countercurrent from the south of Yanmei Island to the west of Okinawa Island played a key role in the polar symmetric distribution of these eddies in the middle part of the Kuroshio. These eddies usually experience three stages of growth, maturation and decay in the process of movement.

Key words: the Kuroshio in the East China Sea, mesoscale eddy, mesoscale eddy distribution, motion law, generation mechanism

CLC Number:

P731.2

LI Zhichao, GUO Junru, SONG Jun, BAI Zhipeng, FU Yanzhao, CAI Yu, WANG Xifeng. Distribution, movement and generation mechanism of the mesoscale eddy around the Kuroshio in the East China Sea[J]. Journal of Marine Sciences, 2022, 40(4): 1-10.

References

[1] ZHANG Zhengguang, WANG Wei, QIU Bo. Oceanic mass transport by mesoscale eddies[J]. Science, 2014, 345(6194): 322-324.
[2] DE JONG M F, BOWER A S, FUREY H H. Two years of observations of warm-core anticyclones in the Labrador Sea and their seasonal cycle in heat and salt stratification[J]. Journal of Physical Oceanography, 2014, 44(2): 427-444.
[3] CHELTON D B, SCHLAX M G, SAMELSON R M. Global observations of nonlinear mesoscale eddies[J]. Progress in Oceanography, 2011, 91(2): 167-216.
[4] FAGHMOUS J H, FRENGER I, YAO Yuanshun, et al. A daily global mesoscale ocean eddy dataset from satellite altimetry[J]. Scientific Data, 2015, 2: 150028.
[5] DONG Changming, MCWILLIAMS J C, LIU Yu, et al. Global heat and salt transports by eddy movement[J]. Nature Communications, 2014, 5: 3294.
[6] 孙湘平.中国近海区域海洋[M].北京:海洋出版社,2006.
SUN Xiangping. China offshore area ocean[M]. Beijing: Ocean Press, 2006.
[7] ZHENG Quanan, TAI Changkuo, HU Jianyu, et al. Satellite altimeter observations of nonlinear Rossby eddy-Kuroshio interaction at the Luzon Strait[J]. Journal of Oceanography, 2011, 67(4): 365-376.
[8] 赵煊,徐海明,徐蜜蜜,等.春季中国东海黑潮区大气热源异常对中国东部降水的影响[J].气象学报,2015,73(2):263-275.
ZHAO Xuan, XU Haiming, XU Mimi, et al. The spring atmospheric heat source over the East China Sea Kuroshio area and its impact on precipitation in Eastern China[J]. Acta Meteorologica Sinica, 2015, 73(2): 263-275.
[9] ZHANG Chunhua, LI Honglin, LIU Songtao, et al. Automatic detection of oceanic eddies in reanalyzed SST images and its application in the East China Sea[J]. Science China Earth Sciences, 2015, 58(12): 2249-2259.
[10] QIN Dandi, WANG Jianhong, LIU Yu, et al. Eddy analysis in the Eastern China Sea using altimetry data[J]. Frontiers of Earth Science, 2015, 9(4): 709-721.
[11] KAGIMOTO T, YAMAGATA T. Seasonal transport variations of the Kuroshio: An OGCM simulation[J]. Journal of Physical Oceanography, 1997, 27(3): 403-418.
[12] 李静.大风和海洋涡旋对中国近海冬季水交换的影响研究[D].上海:上海海洋大学,2016.
LI Jing. Study on the effect of gale and ocean eddy on Chinese offshore water exchange in winter[D]. Shanghai: Shanghai Ocean University, 2016.
[13] 郭炳火,葛人峰.东海黑潮锋面涡旋在陆架水与黑潮水交换中的作用[J].海洋学报,1997,19(6):1-11.
GUO Binghuo, GE Renfeng. The role of Kuroshio front vortex in the East China Sea in the exchange between shelf water and Kuroshio water[J]. Acta Oceanologica Sinica, 1997, 19(6): 1-11.
[14] 郭炳火,林葵,左海滨,等.东海环流的某些特征[C]//孙湘平.黑潮调查研究论文集.北京:海洋出版社,1987:15-32.
GUO Binghuo, LIN Kui, ZUO Haibin, et al. Some features on the circulation in the east China sea[C]//SUN Xiangping. Essays on Kuroshio investigation and research.Beijing: Ocean Press, 1987: 15-32.
[15] YUAN Yaochu, SU Jilan. The calculation of Kuroshio Current structure in the East China Sea—Early summer 1986[J]. Progress in Oceanography, 1988, 21(3/4): 343-361.
[16] 于洪华,苏纪兰.东海南部黑潮区的反气旋涡旋特征分析[C]//国家海洋局科技司.黑潮调查研究论文选(四).北京:海洋出版社,1992:228-238.
YU Honghua, SU Jilan. Characteristic analysis of the anti-cyclonic gyres in the area of Kuroshio South of the East China Sea[C]//Dapartment of science and Technology Selected papers of Kuroshio investigation and research 4. Beijing: Ocean Press, 1992: 228-238.
[17] 袁耀初,管秉贤.中国近海及其附近海域若干涡旋研究综述 Ⅱ.东海和琉球群岛以东海域[J].海洋学报,2007,29(2):1-17.
YUAN Yaochu, GUAN Bingxian. Overview of studies on some eddies in the China Seas and their adjacent seas Ⅱ. The East China Sea and the region east of the Ryukyu Islands[J]. Acta Oceanologica Sinica, 2007, 29(2): 1-17.
[18] 金宝刚.北太平洋西边界流-中尺度涡相互作用研究[D].南京:解放军理工大学,2011.
JIN Baogang. Study on the interaction between the western boundary current and mesoscale eddy in the North Pacific [D]. Nanjing: PLA University of Science and Technology, 2011.
[19] LIU Yu, DONG Changming, LIU Xiaohui, et al. Antisym-metry of oceanic eddies across the Kuroshio over a shelfbreak[J]. Scientific Reports, 2017, 7: 6761.
[20] MASON E, PASCUAL A, MCWILLIAMS J C. A new sea surface height-based code for oceanic mesoscale eddy tracking[J]. Journal of Atmospheric and Oceanic Technology, 2014, 31(5): 1181-1188.
[21] 鲍献文,林霄沛,吴德星,等.东海陆架环流季节变化的模拟与分析[J].中国海洋大学学报:自然科学版,2005,35(3):349-356.
BAO Xianwen, LIN Xiaopei, WU Dexing, et al. Simulation and analysis of shelf circulation and its seasonal variability in the East China Sea[J]. Journal of Ocean University of Qingdao, 2005, 35(3): 349-356.
[22] 郭永怀.边界层理论讲义[M].合肥:中国科学技术大学出版社,2008:38-53.
GUO Yonghuai. Lecture notes on boundary layer theory[M]. Hefei: University of Science and Technology of China Press, 2008: 38-53.
[23] 李福宝,李勤.流体力学[M].北京:冶金工业出版社,2010:122-125.
LI Fubao, LI Qin. Hydromechanics[M]. Beijing: Metal-lurgical Industry Press, 2010: 122-125.
[24] 吕华庆,魏守林,周华民.流体力学基础[M].杭州:浙江科学技术出版社,2006:190-194.
LÜ Huaqing, WEI Shoulin, ZHOU Huamin. Fundamentals of fluid mechanics[M]. Hangzhou: Zhejiang Science & Technology Press, 2006: 190-994.
[25] DEWAR W K, BANE J M. Gulf stream dynamics. pad II: Eddy energetics at 73°W[J]. Journal of Physical Oceano-graphy, 1989, 19(10): 1574-1587.
[26] BERLOFF P, MEACHAM S P. On the stability of the wind-driven circulation[J]. Journal of Marine Research, 1998, 56(5): 937-993.
[27] OLIVEIRA L R, PIOLA A R, MATA MM, et al. Brazil Current surface circulation and energetics observed from drifting buoys[J]. Journal of Geophysical Research, 2009, 114(C10): C10006.
[28] 孙湘平.东海黑潮表层流路(途径)的初步分析[C]//孙湘平.黑潮调查研究论文集.北京:海洋出版社,1987:1-14.
SUN Xiangping. Analysis of the surface path of Kuroshio in the East China Sea[C]//SUN Xiangping. Essays on Kuroshio investigation and research. Beijing: Ocean Press, 1987:1-14.
[29] 汤毓祥.东海黑潮区域性变异的分析[J].海洋学报,1995,17(4):22-29.
TANG Yuxiang. Analysis of regional variation of Kuroshio in the East China Sea[J]. Acta Oceanologica Sinica, 1995, 17(4): 22-29.
[30] KURIAN J, COLAS F, CAPET X, et al. Eddy properties in the California current system[J]. Journal of Geophysical Research, 2011, 116(C8): C08027.