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| 1 | 南海中尺度涡研究进展显示文摘根据维基百科的定义(https:∥en.wikipedia.org/wiki/Edd),海洋中水平直径在10~500km、持续时间由数天至数月之间的水平旋转水体通称为中尺度涡。南海中尺度涡最早发现于1956年,60a来的观测与研究表明,南海是中尺度涡多发、频发海区。南海中尺度涡研究大致经历了早期发现、将中尺度涡当作单体运动现象研究、统计分析和当作群体运动现象研究等阶段,本文概要评述南海中尺度涡研究发展史和近年最新研究进展。经过60a的观测与研究,南海中尺度涡的宏观特征,包括三维结构和运动学,已大致清楚。南海中尺度涡全年皆可发生,主要分布在水深大于1 000m的深海盆,其中吕宋海峡以西和海盆西边界最为集中,气旋式冷涡和反气旋式暖涡发生概率大致相同。南海中尺度涡海面半径大多分布在50~150km,半径随水深减小,平均水平尺度比太平洋的涡旋要小。涡旋个数逐月变化,但季节规律不明显;年际变化幅度约20%,但与ENSO无明显对应关系;年平均个数的统计结果不一,最少11个·a^(-1),最多49个·a^(-1)。南海中尺度涡旋转流场从表层一直延伸到海底,流矢量表层(100m)最大(可达40cm·s^(-1)),随水深减小,2 000m仍可达3.5~5.0cm·s^(-1),但相对涡旋中心不对称,涡轴线向西倾斜。南海中尺度涡以2.0~9.0cm·s^(-1)的速度向西传播,低速区分布在深海盆东边界和西南部分海域。海面涡度平均值在5.4×10^(-6)~20×10^(-6) s^(-1)区间,高于太平洋平均值。近期研究把南海中尺度涡视为群体运动现象,先后提出长寿涡列、驻波模态和罗斯贝标准模等新概念。关于南海中尺度涡的发生机制,前人多认为黑潮和南海局地为起源。最新观点认为以罗斯贝波和中尺度涡为表现形式的太平洋中尺度扰动直接进入南海,并与海盆固有振荡模态发生共振,从而构成太平洋起源。而南海中尺度涡耗散过程、中尺度涡与其他海洋过程的相互作用有待进一步研究。 | 郑全安 谢玲玲 郑志文 胡建宇 | 2017 | 海洋科学进展2017，35，2： | 35 |
| 2 | 黑潮入侵东海陆架途径及其影响研究进展显示文摘基于中国科学院战略性先导科技专项(A类)'热带西太平洋海洋系统物质能量交换及其影响'的项目二'黑潮及其变异对中国近海生态系统的影响'的航次调查资料、历史资料和数值模拟结果,对黑潮入侵东海的途径、机理和影响研究取得了重要进展,主要认识和成果如下。在长江口邻近海域的赤潮高发区,多学科研究结果证实存在黑潮入侵东海陆架近岸的底部分支,该分支是黑潮影响近海生态过程的主要途径。进一步的研究发现该底部分支存在季节变化:通常情况下,在春季开始出现,在夏季7月份达到最强,可以入侵到近岸50m等深线位置,向北可到达30.5°N附近,然后在秋、冬季其入侵主轴位置逐渐远离岸线向外海偏移,不会入侵到50m等深线以西的近岸区域,该底部分支出现和赤潮发生具有一定的同步性。数值模拟和观测结果表明黑潮入侵底部分支还存在年际变化。基于地球动力学理论,提出了地形β-spiral理论,并为模拟结果和观测资料所验证,该理论可以很好的解释为什么黑潮入侵分支会存在,并且该理论预测出凡是黑潮路径与等深线不平行的地方都会发生入侵流的垂向偏转,底层流的方向和地形梯度的角度决定了入侵主要发生在底层还是表层,且该理论在世界大洋具有普适性。此外,研究还表明,黑潮入侵底部分支可以把具有高磷酸盐、高盐、溶解氧含量相对较低等特征的黑潮次表层水及热带藻种等物质输送到长江口邻近海域,从而对东海陆架生态系统产生重要影响。 | 杨德周 尹宝树 侯一筠 孙松 俞志明 宋金明 许灵静 于非 宋秀贤 于仁成 袁华茂 李新正 袁涌铨 | 2017 | 海洋与湖沼2017，48，6： | 15 |
| 3 | Preliminary results of a regional air-sea coupled model over East Asia显示文摘We have established a regional air-sea coupled model over East Asia and conducted a 20-year integration to evaluate its performance in reproducing the present climate.The coupled model consists of RegCM3 and HYCOM controlled by the OASIS3 coupler with resuolution of 60 km for the atmosphere and 33 km for the ocean,respectively.Unlike some other regional air-sea coupled models,a one-way nesting method is employed in the oceanic component and a heat flux adjustment for solar radiation is used to remove an about 2°C cold bias in SST.The primary analysis for this 20-year integration shows that the coupled model successfully reproduces the main features of the circulations over East Asia,both in the atmosphere and the ocean,including climatology,seasonal and interannual variations.Improvements are seen in the coupled model compared to the uncoupled one,especially in the simulation of precipitation,the most important element of the East Asian monsoon,although there are still obvious discrepancies that come mainly from the model components themselves.Further analyses show that the rainfall simulation benefits from the enhancements of the Northwest Pacific Subtropical High in summer,which leads to the improvement of the moisture flux simula-tion at the middle-lower atmospheric circulation.The results indicate that the regional air-sea coupled model is more suitable for the East Asia monsoon simulation. | LI Tao ZHOU GuangQing | 2010 | Chinese Science Bulletin2010，55，21： | 10 |
| 4 | Variability of surface velocity in the Kuroshio Current and adjacent waters derived from Argos drifter buoys and satellite altimeter data显示文摘By combining Argos drifter buoys and TOPEX/POSEIDON altimeter data, the time series of sea-surface velocity fields in the Kuroshio Current (KC) and adjacent regions are established. And the variability of the KC from the Luzon Strait to the Tokara Strait is studied based on the velocity fields. The results show that the dominant variability period varies in different segments of the KC: The primary period near the Luzon Strait and to the east of Taiwan Island is the intra-seasonal time scale; the KC on the continental shelf of the ECS is the steadiest segment without obvious periodicity, while the Tokara Strait shows the period of seasonal variability. The diverse periods are caused by the Rossby waves propagating from the interior ocean, with adjustments in topography of island chain and local wind stress. | 马超 吴德星 林霄沛 | 2009 | Chinese Journal of Oceanology and Limnology2009，27，2： | 10 |
| 5 | 一个东亚区域海气耦合模式初步结果显示文摘建立了一个应用于东亚的区域海气耦合模式并通过20年的连续积分来评估其对东亚气候的模拟能力.模式由大气模式RegCM3和海洋模式HYCOM组成并利用OASIS3耦合器控制整个模式的运行,其中RegCM3的水平分辨率为60km,HYCOM为33km.与其他区域海气耦合模式相比,该模式的显著特点是耦合模式中海洋侧边界采用了单向嵌套方法来处理侧边界强迫问题.另外,在耦合模式中对太阳短波辐射进行了通量订正,较好地消除了在直接耦合时出现的海温偏冷2℃的问题.对模拟结果的初步分析表明,该耦合模式可以成功地模拟出东亚地区大气和海洋的气候平均态,季节变化以及年际变化的主要特征.尽管由于分量模式本身的缺陷导致耦合模式的模拟结果和观测还存在一定的差距,但和未耦合时相比确有一定程度的改善,尤其是在东亚季风中最为重要因素之一的降水的模拟上.进一步的分析表明降水模拟得到改善得益于耦合模式对夏季西太平洋副高模拟能力的提高,从而增强了中低纬大气中水汽输送的模拟能力以及降水和海表温度(SST)的关系.这些结果表明,在东亚地区区域海气耦合模式具有一定优势,但需要对模拟结果进行更加细致的分析,如从日变化到年际变化的更详细分析. | 李涛 周广庆 | 2010 | 科学通报2010，55，9： | 8 |
| 6 | 入侵南海的黑潮流套及其脱落涡旋显示文摘将2003年、2004年和2005年秋、冬季在吕宋海峡投放的卫星跟踪漂流浮标(Argos)资料用于分析黑潮通过吕宋海峡时的流型。结果表明,秋、冬季黑潮表层流存在3种类型:北向型、西向型和流套-涡旋型,后两种入侵南海。统计分析指出吕宋海峡表层流进入流套-涡旋型路径的概率为0.23,黑潮流套的纬向尺度最大达210km,仅发生在恒春海脊西侧的台湾岛西南海域。黑潮流套仅是黑潮流分离的一部分,而非黑潮整体蛇形入侵南海,这与墨西哥湾的蛇形流不一样。在流套内西向流速大于东向流速,这可能是流套西向发展的原因之一,黑潮流套常可演变成脱落涡旋,也可能就地消亡。脱落涡旋以约10cm/s速度西移。 | 郭景松 冯颖 袁业立 郭炳火 | 2013 | 海洋与湖沼2013，44，3： | 7 |
| 7 | Variation of the Kuroshio intrusion pathways northeast of Taiwan using the Lagrangian method显示文摘The seasonal variations of the Kuroshio intrusion pathways northeast of Taiwan were investigated using observational data from satellite-tracked sea surface drifters and a numerical particle-tracking experiment based on a high-resolution numerical ocean model. The results of sea surface drifter data observed from 1989 to 2013 indicate that the Kuroshio surface intrusion follows two distinct pathways: one is a northwestward intrusion along the northern coast of Taiwan Island, and the other is a direct intrusion near the turn of the shelf break. The former occurs primarily in the winter, while the latter exists year round. A particle-tracking experiment in the high-resolution numerical model reproduces the two observed intrusion paths by the sea surface drifters. The three-dimensional structure of the Kuroshio intrusion is revealed by the model results. The pathways, features and possible dynamic mechanisms of the subsurface intrusion are also discussed. | LIU XiaoHui CHEN DaKe DONG ChangMing HE HaiLun | 2016 | Science China Earth Sciences2016，59，2： | 7 |
| 8 | A Modelling Study of Inter-Annual Variation of Kuroshio Intrusion on the Shelf of East China Sea显示文摘Inter-annual variability of the Kuroshio water intrusion on the shelf of East China Sea (ECS) was simulated with a nested global and Northwest Pacific ocean circulation model.The model analysis reveals the influence of the variability of Kuroshio transport east of Taiwan on the intrusion to the northeast of Taiwan:high correlation (r=0.92) with the on-shore volume flux in the lower layer (50 200 m) ;low correlation (r=0.50) with the on-shore flux in the upper layer (0 50 m) .Spatial distribution of correlations between volume fluxes and sea surface height suggests that inter-annual variability of the Kuroshio flux east of Taiwan and its subsurface water intruding to the shelf lag behind the sea surface height anomalies in the central Pacific at 162 E by about 14 months,and could be related to wind-forced variation in the interior North Pacific that propagates westward as Rossby waves.The intrusion of Kuroshio surface water is also influenced by local winds.The intruding Kuroshio subsurface water causes variations of temperature and salinity of bottom waters on the southern ECS shelf.The influence of the intruding Kuroshio subsurface water extends widely from the shelf slope northeast of Taiwan northward to the central ECS near the 60 m isobath,and northeastward to the region near the 90 m isobath. | LI Jiaxing WEI Hao ZHANG Zhihua LU Youyu | 2013 | Journal of Ocean University of China2013，12，4： | 6 |
| 9 | 利用拉格朗日方法研究台湾东北黑潮路径变化显示文摘利用海表漂流浮标观测和高分辨率数值模式的示踪粒子试验,研究了黑潮在台湾东北入侵东海的路径及其季节变化规律.通过分析1989~2013年的海表漂流浮标数据,发现黑潮在台湾东北的表层入侵存在两条明显的路径:一条为沿台湾岛北岸的西北向入侵,另一条为陆坡转折附近的直接入侵;前者主要在冬季出现,而后者则全年都存在.高分辨率数值模式的示踪粒子试验印证了表面漂流浮标观测的结果,同时揭示了黑潮入侵的三维结构,给出了黑潮次表层水入侵的路径、特征和可能成因. | 刘晓辉 陈大可 董昌明 何海伦 | 2015 | 中国科学:地球科学2015，45，12： | 6 |
| 10 | 吕宋海峡浮标轨迹的拉格朗日拟序结构分析显示文摘文章利用海表流速得到的拉格朗日拟序结构(Lagrangian coherent strctures,LCSs),并结合漂流浮标轨迹资料,分析吕宋海峡附近水域表层环流和水输运特征。结果显示,LCSs能够很好地描绘吕宋海峡附近水域的表层水体输运结构,解释了浮标运动轨迹的变化。冬季,吕宋海峡附近水域存在着条带状LCSs,以东南-西北走向由太平洋穿过吕宋海峡进入南海;夏季,跨海峡的LCSs在形态上转变为西南-东北走向,并由南海经吕宋海峡进入太平洋。LCSs形成的输运通道与壁垒揭示了吕宋海峡水交换季节变化的原因,太平洋与南海表层水主要沿着以上两种形态LCSs构成的输运通道进行交换。 | 黄高龙 韦惺 詹海刚 | 2015 | 热带海洋学报2015，34，1： | 5 |
| 11 | 黑潮跨陆架入侵东海年际变化的数值模拟显示文摘为了研究黑潮跨过200m等深线对东海入侵的年际变化特征,本文基于ROMS(Regional Ocean Modeling System)海洋模式,对西北太平洋海域进行了高分辨率的数值模拟,模式水平分辨率高达4km,该分辨率可以很好地分辨黑潮以东区域的中尺度涡旋等过程。模式首先进行了6年的气候态模拟,然后进行了1993到2015年的后报模拟。模式很好地再现了东海陆架已知的环流结构,模拟出的对马海峡和台湾海峡的年平均流量和观测结果也比较一致。基于模式结果,利用旋转经验正交函数(REOF)的方法,对黑潮跨过200m等深线流量的年际变化进行分析。REOF的主要模态表明,黑潮跨过200m等深线对东海陆架的入侵主要发生台湾东北,并且入侵主要集中在黑潮次表层水中。主要模态的时间系数表明,黑潮入侵东海陆架的年平均流量存在一个8年的变化周期。相关性分析表明,黑潮入侵东海陆架的年际变化和太平洋年代际振荡PDO(Pacific Decadal Oscillation)指标具有显著的负相关,其相关系数达–0.63。该相关可以通过如下过程解释:PDO会导致东太平洋风应力涡度异常,由Sverdrup关系可知向赤道的体积输运也会相应地产生异常,根据质量守恒,向赤道体积输运的异常必然通过西边界流-黑潮的异常来平衡,从而导致黑潮入侵东海陆架强烈的年际变化。 | 杨德周 许灵静 尹宝树 冯兴如 陈海英 齐继峰 崔煊 | 2017 | 海洋与湖沼2017，48，6： | 4 |
| 12 | A 2D-numerical modeling of the generation and propagation of internal solitary waves in the Luzon Strait显示文摘The wide presence of internal solitary waves (ISWs) in the northern South China Sea (SCS) has been confirmed by both Synthetic Aperture Radar (SAR) images and in situ observations.These ISWs are believed being generated over the varying topography in the Luzon Strait.They typically propagate westwards into the SCS with a diurnal or semidiurnal period.Their generation sites are,however,not yet solidly identified.To obtain a clear picture of the ISWs,we designed numerical experiments to analyze the generation and propagation of the ISWs in the Luzon Strait using a 2-dimensional non-hydrostatic model.The model current is forced by barotropic or baroclinic currents imposed at open boundaries.The experiments show that the tidal current serves as a kind of triggering force for the ISWs over the submarine ridges in the strait.Under the forcing of tidal currents,depressions are formed near the ridges.The ISWs then split from the depressions through a process different from lee-wave generation mechanism.The appearance of the ISWs is influenced by the strength and period of the forcing current: the ISWs are more likely to be generated by a stronger tidal current.That is why the ISWs in the Luzon Strait are frequently observed during spring tide.Compared with diurnal tidal current,the ISWs generated by semidiurnal tidal current with the same amplitude is much more energetic.It is partly because that the wave beams in diurnal frequency have a larger angle with the vertical direction,thus are more likely to be reflected by the topography slope.The impact of the Kuroshio to the ISWs is also analyzed by adding a vertical uniform or shear current at boundaries.A vertically uniform current may generate ISWs directly.On the other hand,a vertically shear current,which is more realistic to represent the Kuroshio branch,seems to have little influence on the generation process and radiating direction of the ISWs in the Luzon Strait. | WANG Gang QIAO Fangli DAI Dejun | 2010 | Acta Oceanologica Sinica2010，29，6： | 4 |
| 13 | Principal-component estimates of the Kuroshio Current axis and path based on the mathematical verification between satellite altimeter and drifting buoy data显示文摘We used satellite altimetry data to investigate the Kuroshio Current because of the higher resolution and wider range of observations. In previous studies, satellite absolute geostrophic velocities were used to study the spatiotemporal variability of the sea surface velocity field along the current, and extraction methods were employed to detect the Kuroshio axes and paths. However, sea surface absolute geostrophic velocity estimated from absolute dynamic topography should be regarded as the geostrophic component of the actual surface velocity, which cannot represent a sea surface current accurately. In this study, mathematical verification between the climatic absolute geostrophic and bin-averaged drifting buoy velocity was established and then adopted to correct the satellite absolute geostrophic velocities. There were some differences in the characteristics between satellite geostrophic and drifting buoy velocities. As a result, the corrected satellite absolute geostrophic velocities were used to detect the Kuroshio axis and path based on a principal-component detection scheme. The results showed that the detection of the Kuroshio axes and paths from corrected absolute geostrophic velocities performed better than those from satellite absolute geostrophic velocities and surface current estimations. The corrected satellite absolute geostrophic velocity may therefore contribute to more precise day-to-day detection of the Kuroshio Current axis and path. | Zhanpeng Zhuang Zhenli Hui Guangbing Yang Xinhua Zhao Yeli Yuan | 2020 | Acta Oceanologica Sinica2020，39，1： | 2 |
| 14 | Seasonal variability of the Kuroshio Current at the PN Section in the East China Sea based on in-situ observation from 1987 to 2010显示文摘As the spatio-temporal variability of the Kuroshio is highly influenced by mesoscale eddies, representing its seasonal variability characteristics requires sufficiently long term observations to reduce the uncertainties.Geostrophic velocity data estimated from hydrographic observation from 1987 to 2010 and the shipboard ADCP velocity data from 1993 to 2008 at the PN Section in the central East China Sea are collected to view the seasonal variability objectively. From both types of observation, it is found that the seasonal climatology mean of the Kuroshio Current exhibits significant difference in three areas, which are located at the Kuroshio Current core and its two flanks in a shallow layer less than 300 m, with the weakest northeast current at the core in autumn, the strongest counter current on the right flank in spring, and the strongest northeast current on the left flank in autumn, respectively. The seasonal variance of the Kuroshio Current also exhibits significant difference on the offshore side of the Kuroshio, with larger variance in spring and summer while smaller variance in autumn and winter. For the current parallel to the PN Section, the ratio of the seasonal variability component to the intraseasonal variability component is relatively smaller than that for the current perpendicular to the PN Section.Further analyses indicate that the seasonal variability at the PN Section is tightly linked to the upstream and downstream current variability. | WEI Yanzhou PEI Yuhua ZHANG Rong-Hua | 2015 | Acta Oceanologica Sinica2015，34，5： | 2 |
| 15 | The numerical simulation of the Kuroshio frontal eddies in the East China Sea using a hybrid coordinate ocean mode显示文摘A hybrid coordinate ocean model (HYCOM) is used to simulate the Kuroshio frontal eddies in the East China Sea (ECS). The research area is located (20°-32°N, 120°-132°E). Using the simulating data, it is figured out that the Kuroshio frontal eddies occur in summer as well as in the other season in this area. The life cycle of the Kuroshio and its frontal eddies is different with the position. The life-cycle of the Kuroshio frontal eddies of the northwest Diaoyu Islands is about 14 d; and the life cycle of the Kuroshio frontal eddies of southwest Yakushima about 20 d. This result extends the in situ researching results greatly. In addition, the vertical impact depth of the Kuroshio frontal eddies is also changing with the position. On the whole, in the ECS, the maximum impact depth of the Kuroshio frontal eddies of the northwest Taiwan Islands is about 75 m; the maximum impact depth of the Kuroshio frontal eddies of the northwest Diaoyu Islands is more than 125 m, but no more than 200 m; and the maximum impact depth of the Kuroshio frontal eddies of southwest Yakushima is up to 100 m. | JIA Yongjun ZHANG Youguang LIN Mingsen | 2013 | Acta Oceanologica Sinica2013，32，5： | 2 |
| 16 | 基于20a卫星高度计数据的黑潮变异特征显示文摘黑潮作为一支典型的西边界流,其路径变化特征及其相关的物理现象对于渔业和航海有着不可忽视的影响。本文基于改进的特征线方法,利用1992-2012年的高度计绝对动力地形数据提取了整个黑潮流区逐月的黑潮主轴和边界位置,并对沿轴速度、主流宽度、表层水体输运以及路径标准差等黑潮特征量进行了分析研究。结果表明,黑潮整体的沿轴速度在夏秋季较大,最大值可达0.95 m/s,而在冬季的速度较小;黑潮主流宽度在10、11月份达到最大值;黑潮表层水体输运在夏季最大,春秋两季次之,冬季最小。沿黑潮流路分区域对黑潮特征进行分析,结果表明,越往黑潮下游,其沿轴速度、主流宽度和表层水体输运越大,同时沿轴速度和表层水体输运量最大值出现的时间也越晚,黑潮主轴位置相对于其多年平均的偏离程度越大,且随时间波动也越强烈。 | 赵新华 杨俊钢 崔伟 | 2016 | 海洋科学2016，40，1： | 2 |
| 17 | 基于海洋模式数据的吕宋海峡输运量和菲律宾黑潮流量关系的分析显示文摘利用全球涡分辨率海洋环流模式OFES的60年(1950—2009)输出资料,用流速资料计算了吕宋岛东侧18°N断面黑潮上游流量(Kuroshio Transport,KT)和120.5°E断面吕宋海峡输运量(Luzon Strait Transport,LST)。研究表明,KT和LST存在四种情况,即:(1)KT大LST小、(2)KT大LST大、(3)KT小LST小和(4)KT小LST大,分别占其总数的34%、11%、13%、42%。合成分析证实:一般情况下,KT大对应黑潮跨越吕宋海峡流态,此时LST较小;KT小时,地转β效应迫使黑潮向西入侵吕宋海峡,此时LST大。然而,吕宋岛东侧和台湾东南沿岸的涡旋常削弱黑潮在吕宋海峡处流量,造成KT大时黑潮亦入侵吕宋海峡,从而出现KT大LST大的情形;太平洋一侧的异常高海表高度诱发吕宋海峡处强地转流,造成KT虽小而黑潮在吕宋海峡处仍是跨越流态,因而LST小。结果表明,LST不仅受KT影响,亦受局地涡旋和海表高度的重要控制。 | 周艳芳 谢强 陈更新 曾丽丽 | 2017 | 海洋与湖沼2017，48，6： | 2 |
| 18 | Detection of the Kuroshio frontal instable processes (KFIP) in the East China Sea using the MODIS images显示文摘The Kuroshio frontal instable processes (KFIP) in the East China Sea (ECS) not only have a great impact on the hydrologic characteristics,the pollutants drift,the distribution of seafloor sediment and the ships navigation of the ECS,but also are closely related to the climate changes of the coastal areas of the ECS.However the frequency and area of occurrence of the KFIP have not been studied fully and detailedly.Because of its high spatial and temporal resolution,MODIS data is a kind of very good data source for surveying and researching the KFIP in the ECS.The aim of this study is to detect the KFIP in the ECS by using MODIS data,and to study the frequency and region of occurrence of the KFIP in the ECS.The selection has coverage of level 2 data of MODIS SST and Kd490 ranging from July 1,2002 to June 30,2009 of the ECS when there was no cloud impact or little.By using of the data,the minimum standard of the Kuroshio temperature fronts and the diffuse attenuation coefficient (Kd490) fronts of the ECS are given.Based on these standards and the curvature distinguish methods,the standard of curvature distinguish for the KFIP in the ECS are put forward.By making use of this standard,we study a total of 2073 satellite-derived images,and discover that as long as there is no cloud impact from January to May and October to December,the KFIP in the ECS are surely found in MODIS satellite images.From June to September,the frequency of occurrence can also reach to 82.9% at least.Moreover,it is obtained that there are three source regions of these instability processes,namely,(26°N,121.5°E) nearby,(27°N,125°E) nearby and (30°N,128°E) nearby.The differences of the characteristics of these instability processes which are generated in different regions are analyzed in the present study. | JIA Yongjun ZHANG Jie | 2010 | Acta Oceanologica Sinica2010，29，6： | 1 |
| 19 | Seasonal characteristics and forcing mechanisms of the surface Kuroshio branch intrusion into the South China Sea显示文摘Using observational data of Argos satellite-tracked drifters from 1988 to 2012, we analyzed seasonal characteristics of the surface Kuroshio branch(KB) intrusion into the South China Sea(SCS). The analysis results are as follows.The surface KB originates from the southern Balintang Channel(BLTC) and Babuyan Channel(BBYC). It begins in late September, reaches peak strength in November–December, and declines at the end of March. The mean speed of drifters along the KB path during their traverse of the Luzon Strait(LS) was 43% faster than during the two days before entering the LS for the flow originating from the southern BLTC, but there was a 24% increase in speed for the flow from the BBYC. The observations show that in winter, monthly-mean sea-level anomalies(SLAs) were positive southwest of Taiwan Island and extended to the northern LS. The SLAs were negative northwest of Luzon Island and extended to the southern LS, which acted like a pump, forcing a part of Kuroshio water westward into the SCS. The condition under which the KB forms was solved by a set of simplified motion equations. The results indicate that whether the KB can form depends upon the sea-level gradient at the central LS and region to the west, as well as the location, speed and direction of Kuroshio surface water when it enters the LS. | Jingsong Guo Zhixin Zhang Changshui Xia Binghuo Guo | 2019 | Acta Oceanologica Sinica2019，38，1： | 1 |
| 20 | Characterization of longshore currents in southern East China Sea during summer and autumn显示文摘Current characteristics and vertical variations during summer and autumn in the southern East China Sea were investigated by measuring current profile, tide, wind, and wave data for 90 d from July 28 to October 25, 2015. Our results are:(1) The current was mainly a(clockwise) rotating flow, displaying reciprocating flow characteristics,and vertically the current directions were the same throughout the vertical profile.(2) The horizontal current speed was strongest during August(summer) with an average speed of 51.8 cm/s. The average current speeds during spring tides were highest in August and weakest in September, with speeds of 59.9 and 42.8 cm/s,respectively.(3) Considerable differences exist in average current speeds in different layers and seasons. The highest average current speeds were found in the middle–upper layers in August and in the middle–lower layers in September and October.(4) The residual current speed was highest in August, when the speed was 12.5–47.1 cm/s,whereas the vertical average current speed was 34.3 cm/s. The depth-averaged residual current speeds in September and October were only 50% of that in August, and the residual current direction gradually rotated in a counter-clockwise direction from the lower to surface layers.(5) Typhoon waves had a significant influence on the currents, and even affected the middle and lower water layers at depths of >70.0 m. Our results showed that the currents are controlled by the dynamic interplay of the Taiwan Warm Current, incursion of the Kuroshio Current onto the continental shelf, and monsoonal changes. | Peng Li Benwei Shi Yangang Li Sijian Wang Xin Lv Yaping Wang Qing Tian | 2020 | Acta Oceanologica Sinica2020，39，3： | 1 |
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