A PRELIMINARY ANALYSIS ON THE CHARACTERISTICS OF THE KUROSHIO FRONTAL EDDY IN THE EAST CHINA SEA IN SPRING   总被引：3，自引：0，他引：3  

郑义芳  黄卫民  Nakamura Yasuaki 《中国海洋湖沼学报》1993,11(3):276-284

The Kuroshi'o front eddy's surface and sectional isothermal distribution characteristics were analyzed on the basis of observation data obtained in April 13-16 of 1989 in the East China Sea. It was found from the similarity between these isothermal distributions with those in January and beginning of June for the years 1986-1990 that the Kuroshio front eddy often occurred from March to the beginning of June. The Kuroshio front eddy movement in the East China Sea in spring was along two routes: the Okinawa Trough route, and the continental shelf slope route. The two moving routes both in the surface layer and in the section are described, their causes are discussed, and differences are compared.  相似文献   

1998年冬季台湾海峡的暖水入侵及其生态响应     

商少凌  洪华生  商少平  张彩云 《遥感学报》2001,5(4):383-387

就1998年2－3月台湾海峡AVHRR表层水温和SeaWiFS叶绿素数据以及当年2月20日至3月8日在台湾海峡北部海区所实施的多学科现场调查资料进行综合分析，着重探讨暖水入侵的过程及其生态响应。结果表明，1998年冬季由澎湖水道北上进入台湾海峡的高温高盐黑潮入侵水强度大于往年，在2月8日－3月13日期间不断增强，直至侵占整个海峡东侧海域，迫使低温低盐且富含营养盐的闽浙沿岸水主流顺大陆沿岸南下。这一过程向海峡西侧海域输入营养盐并使之达到适宜的水温，极可能是西侧海域出现叶绿素高值区、呈现出与往年相反的叶绿素分布态势的主控机制。分析这一现象与1997－1998年的E1 Nino事件可能存在着某种关联。  相似文献   

北太平洋副热带环流变异及其对我国近海动力环境的影响   总被引：1，自引：0，他引：1  

吴立新  刘秦玉  胡敦欣  李崇银  左军成  俞永强  孙澈  王启 《地球科学进展》2007,22(12):1224-1230

我国东部陆架海和南海是国防安全的重要门户;位处第二岛链以西的副热带北太平洋既是各国争夺的重要海区,又是我国从近海走向大洋的重要通道.围绕"北太平洋副热带环流变异如何通过黑潮与我国近海动力环境之间相互作用"这一国际前沿科学问题,国家重点基础研究发展计划项目"北太平洋副热带环流变异及其对我国近海动力环境的影响"于2007年9月正式立项.该项目不仅有助于拓展和丰富海洋动力学理论,揭示我国近海及邻近大洋动力环境变异机制,提高预测能力,而且也将为维护我国国防安全和海洋权益,为可持续开发利用海洋资源提供海洋动力环境保障.该项目主要研究内容包括:①北太平洋副热带环流变异和调整机理;②黑潮与我国近海的能量与水体交换过程及机制;③北太平洋副热带环流变异与大气驱动力的耦合效应;④我国近海及邻近大洋动力环境变异的可预测性研究.拟解决的关键科学问题为:北太平洋副热带内区环流变异的机理及其对黑潮的影响;黑潮源头变异机理及其对吕宋海峡水交换的影响和黑潮变异机理及其对东部陆架海域动力环境的影响.  相似文献   

南海海洋环流研究综述   总被引：18，自引：0，他引：18  

杨海军  刘秦玉 《地球科学进展》1998,13(4):364-368

综述了近二十年来南海海洋环流的主要研究成果，指出太阳辐射、季风和地形是影响南海环流的主要因素；提出了南海环流研究中应特别注意的几个关键问题，即南海环流的平均状态、南海暖流、南海中的局地涡旋、南海暖池、黑潮与南海水的交换、地形对南海环流的作用以及南海水温变化与ENSO的关系等；最后就目前研究中存在的困难提出了相应的对策。  相似文献   

华北地区汛期降水与热带西太平洋暖池和黑潮的关系   总被引：31，自引：2，他引：29  

张启龙  翁学传  程明华 《高原气象》1999,18(4):575-583

根据华北地区１８个代表站１９５１￣１９９６年月降水资料,利用对应分析法对该地区进行降水气候区的划分,并讨论了华北汛期降水与热带西太平洋暖池和黑潮热输送的关系。结果表明：华北地区可划分为两个降水气候区;华北１区汛期降水与热带西太平洋暖池西部热含量有密切的联系,特别是与前一年１０月热带西太平洋暖池西部热含量存在着明显的负相关关系;华北Ⅱ区汛期降水与同年冬季黑潮热输送有较密切的负相关关系。初步分析表明,  相似文献   

Climatological distribution of lightning density observed by satellites in China and its circumjacent regions   总被引：14，自引：1，他引：13  

MA Ming  TAO Shanchang  ZHU Baoyou & LU Weitao School of Earth  Space Sciences  University of Science  Technology of China  Hefei  China 《中国科学D辑(英文版)》2005,48(2):219-229

The 0.5°×0.5°grid resolution distribution of lightning density in China and its circumjacent regions have been analyzed by using the satellite-borne OTD (Apr 1995-Mar 2000) and LIS (Dec 1997-Mar 2003) databases. It is shown that: (i) Firstly, the variability of the lightning density (LD) is particularly pronounced over the different subareas, 9 times greater over the south than the north side of Himalayas Mountains, 2.5 times greater over the eastern than the western area of China. While the maximum and minimum LD are respectively 31.4fl/km2/a (in Guangzhou region) and less than 0.2fl/km2/a (in the desert of western China). Secondly, the LD of China's continent regularly varies with latitude and distance off coast, which is consistent with annual mean precipitation in varying trend. In conclusion, the Qinghai-Tibet Plateau, the China's three-step staircase topography and the latitude are three important factors affecting macro-scale characteristics of the LD distribution, (ii) The regional differences  相似文献   

Transport of oceanic nitrate from the continental shelf to the coastal basin in relation to the path of the Kuroshio   总被引：1，自引：0，他引：1  

Ryo Sugimoto  Akihide Kasai  Toshihiro Miyajima  Kouichi Fujita 《Continental Shelf Research》2009,29(14):1678-1688

Hydrographic and biogeochemical observations were conducted along the longitudinal section from Ise Bay to the continental margin (southern coast of Japan) to investigate changes according to the Kuroshio path variations during the summer. The strength of the uplift of the cold deep water was influenced by the surface intrusion of the Kuroshio water to the shelf region. When the intrusion of the Kuroshio surface water to the shelf region was weak in 2006, the cold and NO₃⁻-rich shelf water intruded into the bottom layer in the bay from the shelf. This bottom intrusion was intensified by the large river discharge. The nitrogen isotope ratio (δ¹⁵N) of NO₃⁻ (4–5‰) in the bottom bay water was same as that in the deeper NO₃⁻ over the shelf, indicating the supply of new nitrogen to the bay. The warm and NO₃⁻-poor shelf water intruded into the middle layer via the mixing region at the bay mouth when the Kuroshio water distributed in the coastal areas off Ise Bay in 2005. The regenerated NO₃⁻ with isotopically light nitrogen (δ¹⁵N=−1‰) was supplied from the shelf to the bay. This NO₃⁻ is regenerated by the nitrification in the upper layer over the shelf. The contribution rate of regenerated NO₃⁻ over the shelf to the total NO₃⁻ in the subsurface chlorophyll maximum layer in the bay was estimated at 56% by a two-source mixing model coupled with the Rayleigh equation.  相似文献   

黑潮近岸分支流在2017年9月与2019年9月差异的研究     

燕杰  侯一筠  刘泽 《海洋与湖沼》2021,52(4):813-822

通过对比2017年9月和2019年9月的温盐大面观测数据,发现东海陆架上黑潮近岸分支流的路径在两次观测中存在显著差异。2019年9月黑潮近岸分支流中上游的路径相较2017年9月明显的东向偏移,造成黑潮次表层水入侵东海近岸海域的强度较弱。为了探究黑潮近岸分支流的上述显著年际差异的原因,利用卫星高度计数据和再分析风场数据,通过分析大面观测同期的绝对海表动力高度、地转流场以及海表风场的差异,阐述了黑潮近岸分支流路径产生显著年际差异的动力机制。2019年8—9月东海海表较2017年8—9月盛行更强的西南向沿岸季风,强的西南向沿岸风通过埃克曼输运促使水体向岸堆积并在近岸区域沿岸西南向堆积。因此, 2019年8—9月东海近岸海域的跨岸方向压力梯度与2017年8—9月相比较小而沿岸压力梯度则较大。2019年8—9月,受压力梯度分布的影响,东海近岸海域产生西南向的沿岸地转流和离岸地转流。其中西南向的沿岸地转流会在底部生成离岸的底埃克曼流,离岸底埃克曼流和离岸地转流共同抑制了黑潮近岸分支流的向岸入侵。这导致2019年9月黑潮近岸分支流的路径向东偏移,黑潮次表层水入侵浙江近海及长江口区域的强度随之减弱。通过分析研究实际观测案例,阐述了风影响黑潮近岸分支流入侵东海近岸海域的动力机制,同时明确指出海表风场会从黑潮近岸分支流的中上游区域改变其路径,进而对黑潮入侵东海近岸海域产生重要影响。  相似文献   

A Lagrangian study of the near-surface intrusion of Pacific water into the South China Sea     

Gaolong Huang  Haigang Zhan  Qingyou He  Xing Wei  Bo Li 《海洋学报(英文版)》2021,40(7):15-30

Satellite-tracked Lagrangian drifters are used to investigate the transport pathways of near-surface water around the Luzon Strait. Particular attention is paid to the intrusion of Pacific water into the South China Sea(SCS).Results from drifter observations suggest that except for the Kuroshio water, other Pacific water that carried by zonal jets, Ekman currents or eddies, can also intrude into the SCS. Motivated by this origin problem of the intrusion water, numerous simulated trajectories are constructed by altimeter-based velocities. Quantitative estimates from simulated trajectories suggest that the contribution of other Pacific water to the total intrusion flux in the Luzon Strait is approximately 13% on average, much smaller than that of Kuroshio water. Even so, over multiple years and many individual intrusion events, the contribution from other Pacific water is quite considerable. The interannual signal in the intrusion flux of these Pacific water might be closely related to variations in a wintertime westward current and eddy activities east of the Luzon Strait. We also found that Ekman drift could significantly contribute to the intrusion of Pacific water and could affect the spreading of intrusion water in the SCS. A case study of an eddy-related intrusion is presented to show the detailed processes of the intrusion of Pacific water and the eddy-Kuroshio interaction.  相似文献   

关于黑潮延伸体海域水体的三维热结构时-空变化特征研究     

邢霄波  徐永生  贾永君  黄超 《海洋预报》2021,(1):68-79

基于西北太平洋Argo数据资料,利用参数化方法,从Argo温盐剖面数据中提取出一系列特征动力参数,定量分析黑潮延伸体海域水体的三维热结构的时-空变化特征、季节变化特征及其与地形和环流的关系。结果表明:黑潮延伸体海域水体的海表面温度存在着明显的冬春弱,夏秋强的季节变化特征,冬季平均海表面温度为15℃,夏季则达到了27℃;混合层深度在春季和夏季都较深,在180 m左右,秋冬较浅,在17 m左右,在水平方向上混合层深度有较强的梯度;温跃层春、夏、秋、冬4季的平均温度表现出明显的南北差异,夏季南部海域平均温度为14℃左右,北部海域较低为5℃左右;季节性温跃层深度大约在100 m左右;黑潮延伸体海域水体的温跃层底部最大深度在800 m左右;黑潮延伸体主体海域中心位置冬天在36°N左右,夏天大约移到34°N。  相似文献