利用拉格朗日方法探究黑潮近岸分支流在2019年春季的起源深度

THE ORIGINATION DEPTH OF THE NEARSHORE KUROSHIO BRANCH CURRENT IN THE SPRING OF 2019 BASED ON THE LAGRANGIAN METHOD

基于ROMS(regional ocean modelling system)模式模拟出2019年春季东海以及临近海域的环流结构和温盐分布。利用拉格朗日方法定量地研究了2019年春季黑潮近岸分支流在台湾以东起源的深度在100-450 m范围内,平均深度约260 m。通过针对台湾海峡流和台湾以东黑潮强度的敏感性实验,进一步得出结论,增大(减小)的台湾以东黑潮流速会减小(增大)黑潮近岸分支流的强度。而增大(减小)的台湾海峡流流速会增大(减小)黑潮近岸分支流的强度。同时,增大(减小)的台湾以东黑潮流会减小(增大)黑潮近岸分支流起源的平均深度。增大(减小)的台湾海峡流流速也会减小(增大)黑潮近岸分支流起源的平均深度。相关结论可为台湾东北黑潮入侵东海变化规律的研究提供参考。

Based on the ROMS(regional oceam modeling system)model,the circulation structure and temperature and salt distribution of the East China Sea in the spring of 2019 were simulated.The Lagrangian method was used to study quantitatively the specific origination depth of the nearshore Kuroshio branch current(NKBC)east of Taiwan Island in spring 2019 during which the NKBC flowed at a depth of 100-450 m,on average of about 260 m.By conducting sensitive experiments on the intensities of the Taiwan Strait current and the Kuroshio east of Taiwan,we found that a strong(weak)Kuroshio in east of Taiwan could reduce(increase)the intensity of the NKBC.A strong(weak)Taiwan Strait current could increase(decrease)the intensity of the NKBC.At the same time,a strong(weak)Kuroshio in east of Taiwan could decrease(increase)the average depth of the origination of NKBC;and a strong(weak)Taiwan Strait current could also reduce(increase)the average depth of the origination of NKBC.The findings can provide valuable references for the study of the law of the Kuroshio intrusion into the East China Sea.