| 巴西暖流和马尔维纳斯寒流交汇点的变动及其影响机制的探讨 |
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| 引用本文： | 范秀梅,樊伟,唐峰华,吴祖立.巴西暖流和马尔维纳斯寒流交汇点的变动及其影响机制的探讨[J].海洋学报,2019,41(9):86-93. |
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| 作者姓名： | 范秀梅 樊伟 唐峰华 吴祖立 |
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| 作者单位： | 中国水产科学研究院东海水产研究所渔业资源遥感信息技术重点开放实验室,上海200090;农业部东海与远洋渔业资源开发利用重点实验室,上海200090;中国水产科学研究院东海水产研究所渔业资源遥感信息技术重点开放实验室,上海200090;农业部东海与远洋渔业资源开发利用重点实验室,上海200090;中国水产科学研究院东海水产研究所渔业资源遥感信息技术重点开放实验室,上海200090;农业部东海与远洋渔业资源开发利用重点实验室,上海200090;中国水产科学研究院东海水产研究所渔业资源遥感信息技术重点开放实验室,上海200090;农业部东海与远洋渔业资源开发利用重点实验室,上海200090 |
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| 基金项目： | 中央级公益性科研院所基本科研业务费（2015T06）；中央级公益性科研院所基本科研业务费（2016Z01-01）。 |
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| 摘 要： | 西南大西洋的马尔维纳斯寒流(Malvinas Current，MC)和巴西暖流(Brazil Current，BC)交汇点(the Brazil-Malvinas Confluence，BMC)的南移是很多影响因子共同作用的结果。本文从海流流量的变化和风场的变化来分析交汇点变动的原因。利用1993年1月至2016年12月的月平均流场计算截面流量，分析得到MC流量呈现递减趋势，而BC流量则出现递增趋势。2014–2016年的Argo浮标的轨迹线表明MC的水体主要来自于南极绕极流(Antarctic Circumpolar Current，ACC)经过德雷克海峡的3个极锋中的其中之一—亚南极锋(the Subantarctic Front，SAF)。计算SAF的流量，得到其也表现出递减的趋势，这是MC流量减少的重要原因。而和SAF相邻位于其南边的极锋(the Polar Front，PF)的流量出现递增趋势。利用1993–2016年月平均风场数据分析得到南半球盛行西风风应力增加且有向南极偏移的趋势，这会使得ACC也有向南极收缩的趋势，这解释了SAF流量减少而PF的流量增加的原因，故得到南半球盛行西风的南移和BC流量的增加是BMC南移的原因。
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| 关 键 词： | 风应力 交汇点 流量 Argo |
| 收稿时间： | 2018/8/27 0:00:00 |
| 修稿时间： | 2019/2/16 0:00:00 |
Research on the variability of Brazil-Malvinas Confluence and its cause |
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| Fan Xiumei,Fan Wei,Tang Fenghua and Wu Zuli.Research on the variability of Brazil-Malvinas Confluence and its cause[J].Acta Oceanologica Sinica (in Chinese),2019,41(9):86-93. |
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| Authors: | Fan Xiumei Fan Wei Tang Fenghua and Wu Zuli |
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| Institution: | 1.Key and Open Laboratory of Fisheries Resources Remote Sensing and Information Technology, East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200090, China2.Key Laboratory of Development and Utilization of East China Sea and Ocean Fisheries Resources, Ministry of Agriculture, Shanghai 200090, China |
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| Abstract: | The Brazil-Malvinas Confluence (BMC) may have a southward shift in a long time trend and many marine factors'' change may cause this drift. We analysis this phenomenon from two aspects:the changes of currents'' volume transport, and the winds'' alternation. Using the monthly mean flow field between 1993 and 2016 to calculate the cross-sectional water transport volume, the results show that the transport change trend of the Malvinas Current (MC) is decreasing and the transport change trend of the Brazil Current (BC) is increasing. The trajectory of the Argo buoy during 2014-2016 indicates that the MC''s water mainly comes from one of the three polar fronts of ACC (Antarctic Circumpolar Current) when passing through the Drake Passage:SAF (the Subantactic Front). Calculating and analyzing the transport of SAF, we find that the transport''s trend of SAF is lessened, which is an important reason caused the reduce of MC''s transport. We also find that the PF''s transport on the south SAF has incremental trend. Based on the monthly mean wind field data during year 1993-2016, we find that the prevailing westerly wind stress in the Southern Hemisphere is growing and moves toward to Antarctic which will make ACC contract to Antarctica. So we can explain that the transport of SAF reduces while the transport of PF increases. Therefore, it is found that the southward movement of the prevailing westerly winds in the Southern Hemisphere and the increase of BC transport are the reasons for the southward drift of BMC. |
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| Keywords: | wind stress confluence transport Argo |
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