Numerical study of the cross-shore range and the intensity of the Nearshore Kuroshio Branch Current(NKBC)

作     者：Jie YAN Yijun HOU Peng QI Fang HU Jie YAN;Yijun HOU;Peng QI;Fang HU

作者机构：CAS Key Laboratory of Ocean Circulation and WavesInstitute of oceanologyChinese Academy of SciencesQingdao 266071China College of Earth and Planetary SciencesUniversity of Chinese Academy of SciencesBeijing 100049China Center for Ocean Mega-ScienceChinese Academy of SciencesQingdao 266071China Laboratory for Ocean and Climate DynamicsPilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China 

出 版 物：《Journal of Oceanology and Limnology》 (海洋湖沼学报（英文）)

年 卷 期：2022年第40卷第1期

页      面：37-54页

核心收录：

学科分类：0710[理学-生物学] 07[理学] 0707[理学-海洋科学] 

基　　金：Supported by the National Natural Science Foundation of China(Nos.41630967 41776020) 

主　　题：East China Sea Nearshore Kuroshio Branch Current(NKBC) Regional Ocean Model System(ROMS) ocean modeling 

摘      要：Temperature and salinity data,obtained by two snapshot surveys during 19-20 May 2019 and 12-25 September 2019 across the East China Sea(ECS)shelf,revealed that the Kuroshio intrusion to the north of 28°N comprised the Nearshore Kuroshio Branch Current(NKBC)and the Off shore Kuroshio Branch Current(OKBC)at the bottom of the ECS during spring 2019,and that the NKBC was weak during autumn *** Regional Ocean Model System was used to reproduce the distribution of water masses and the current structure over the continental shelf of the ECS during *** of the momentum balances indicated that the cross-shore range and the intensity of the NKBC were determined by the combination of the geostrophic fl ow and bottom Ekman *** comparison with that in May 2019,a weakened shoreward bottom Ekman current and an increased off shoreward geostrophic fl ow caused the disappearance of cross-shore range of the NKBC in September ***,a diminished northeastward alongshore geostrophic fl ow in September 2019 also weakened the intensity of the *** experiments indicated that a strong southwestward wind can push the western(eastern)boundary of the NKBC further off shoreward(shoreward)by increasing(decreasing)the off shore geostrophic fl ow(bottom Ekman current).A weak Taiwan Warm Current(TWC)can move the eastern boundary of the NKBC shoreward by decreasing the onshore bottom Ekman current.A weak Kuroshio Current(KC)can move the eastern boundary of the NKBC shoreward by increasing the off shoreward geostrophic fl ***,a strong(weak)southwestward wind,weak(strong)TWC,and strong(weak)KC can diminish(enhance)the intensity of the *** the three factors,the wind plays the major role in infl uencing the NKBC.