1998年南海夏季风环流与动能 收支的多尺度特征     

高荣珍  周发琇  管长龙  王东晓 《中国海洋大学学报(自然科学版)》2001,31(2):158-164

利用1998年NCEP/NCAR日平均资料研究南海夏季风环流及动能收支的多尺度变化。 结果表明1998年南海夏季风环流在对流层高层以季节变化为主，在低空以季节内变化为主；但在整个对流层，动能收支各项的变化均表现为短周期变化过程较强，而季节变化则较弱。在夏季风爆发前后，动能收支主要取决于120d和30～60d变化，爆发阶段突出了准两周与天气尺度变化的重要作用。  相似文献   

夏季风场对长江冲淡水扩展影响的数值模拟   总被引：7，自引：3，他引：7  

朱建荣  李永平  沈焕庭 《海洋与湖沼》1997,28(1):72-79

建立一个σ坐标系下三维非线性斜压陆架模式，研究长江冲淡扩展的动力机制。数值试验再现了夏季长江冲淡水转向东北的现象，夏季风场对长江冲淡水扩展的影响，取决于风速的大小和动向，风速为３ｍ／ｓ的南风，对冲淡水向北扩展的影响比较明显，而当南风风速达到６ｍ／ｓ时，则起着十分显著的作用，西南风加强了冲淡水向东扩展，但对南北向的扩展影响甚微，东南风抑了冲淡水向东扩散，并使之偏向西北，明确阐明了夏季风场对冲淡水扩展  相似文献   

南海南部混合层底盐度异常水体的结构特征   总被引：2，自引：2，他引：2  

杜岩  王东晓  陈举  齐义泉  施平 《热带海洋学报》2004,23(6):52-59

利用南海南部航次的温度和盐度资料,给出春、夏季风转换期间南海南部混合层以下盐度异常水体的空间结构特征。分析发现,这种盐度异常水体出现在混合层底,其垂向分布有2种类型：第1种类型主要分布在南海南部的东侧,特征为混合层底出现低盐极值水体;第2种类型主要分布在南海南部的西侧,特征为在较深的位置出现低盐极值水体,在低盐极值之上会出现高盐极值水体。  相似文献   

北太平洋海温与福建后汛期降水量的关系   总被引：1，自引：0，他引：1  

李玲  苏万康 《台湾海峡》2005,24(1):7-14

本文应用奇异值分解方法给出同期和前期北太平洋海温与福建后汛期降水量相互匹配的空间典型分布型．分析结果表明，无论同期还是前期北太平洋海温与福建后汛期降水量之间均存在着清晰的遥相关．同期的赤道中东太平洋海温异常增高、日本以东洋面海温偏低，福建后汛期降水量偏少；另外，闽南地区后汛期降水量与同期NINO西海区和黑潮海区的海温成正相关关系．冬、春季出现厄尔尼诺现象时，次年福建尤其是闽南沿海后汛期降水量将偏少．  相似文献   

春夏季季风转换期南海南部的异常表层水     

方文东  黄企洲  邱章  施平 《热带海洋学报》2001,20(1):77-81

对1985－1998年期间的海洋调查温盐深（CTD）资料进行综合分析，发现南海南部春夏季季风转换期存在盐度逆转的异常表层水。实测资料表明，该异常表层水覆盖在南海南部的中部、东部大部分地区。冬季风停止引起苏禄海高温高超国水西向侵入，成为该海区东部近表面异常高盐水的来源之一。海面强的蒸发和表层水弱的垂向混合导致近表面水具有高盐特性，近表面高盐水与其下部保持着冬季遗存的局地低盐水叠置，形成了盐度逆转现象。  相似文献   

Distribution pattern of marine flagellate and its controlling factors in the central and north part of the Huanghai Sea in early summer     

Huang Lingfeng  Guo Feng  Huang Bangqin  Xiao Tian 《海洋学报(英文版)》2003,22(2):273-280

Abstract-A survey was carried out in the central and north part of the Huanghai Sea (34.5°～37.0°N, 120.5°～124.0°E) during June 12～27, 2000. It was found that the abundance of marineflagellate ranged from 45 to 1278 cell/ml, 479 cell/ml in average. Flagellate was more abundant in thecentral part than in the north part of Huanghai Sea, and the abundance decreased with the increasingdistance from the coast, showing a similar distribution pattern with isotherm. Vertically, high densityof flagellate was always presented in the bottom of thermocline, and formed a dense accumulation in thecentral area of the Huanghai Sea Cold Water Mass. The effects of physical and biological factors on thedistribution of marine flagellate in early summer were discussed. Water temperature (especially the ex-istence of thermocline) rather than salinity showed significant effect on the distribution pattern of marineflagellate in the Huanghai Sea in early summer. When comparing the abundance of marine flagellatewith that o  相似文献   

Indian summer monsoon variability during the holocene as recorded in sediments of the Arabian Sea: Timing and implications   总被引：1，自引：0，他引：1  

Meloth Thamban  Hodaka Kawahata  Venigalla Purnachandra Rao 《Journal of Oceanography》2007,63(6):1009-1020

Indian monsoon precipitation fluctuated significantly during the Holocene and a reliable reconstruction of the timing of the events and their implications is of great benefit to our understanding of the effect and response of low latitude climate systems to the forcing factors. We have carried out high-resolution terrigenous proxy studies on a laminated sediment core from the Oxygen Minimum Zone of the eastern Arabian Sea margin to reconstruct the summer monsoon-controlled precipitation changes during the Holocene. The temporal variation in the terrigenous proxy indicators of this core, in combination with other high-quality cores from the Arabian Sea, suggests several abrupt events in monsoon precipitation throughout the Holocene. The early Holocene monsoon intensification occurred in two abrupt steps at 9500 and 9100 years BP and weakened gradually thereafter, starting at 8500 years BP. A weakening in precipitation recorded at ∼7000 years BP, synchronous with similar conditions in India. One of the most significant weak monsoon periods recorded in our studies lies between 6000 and 5500 years BP. Spectral analysis of the precipitation records reveals statistically significant periodicities at 2200, 1350, 950, 750, 470, 320, 220, 156, 126, 113, 104 and 92 years. Most of these millennial-to-centennial cycles exist in various monsoon records as well as the tree ring Δ¹⁴C data and/or other solar proxy records. We suggest that throughout the Holocene, externally, small changes in solar activity controlled the Indian monsoon to a large extent, whereas internally, non-solar causes could have influenced the amplitude of decadal-to-centennial oscillations.  相似文献   

最近6.5～2.2 Ma黄土高原粉尘通量变化及其指示的东亚冬季风演化和亚洲干旱化   总被引：13，自引：0，他引：13  

曹军骥  张小曳  安芷生  郑洪波 《海洋地质与第四纪地质》2003,23(3):97-101

黄土高原红粘土沉积与北太平洋885/886孔深海沉积记录的亚洲粉尘沉积通量对比显示,海陆风尘记录万年尺度的变化趋势一致,指示了6．5Ma以来亚洲内陆干旱化和冬季风环流变化的历史：6．5MaRP粉尘源区出现一定程度的干旱化,粉尘通量增加,为红粘土的形成提供了物质基础;5．2～3．6MaBP源区气候较为湿润,冬季风环流偏弱,导致粉尘通量大幅下降;3．6～2．6MaBP。由于青藏高原加速隆升,导致源区气候迅速干旱,冬季风环流发展,粉尘通量急剧增加。但海陆粉尘通量变化也存在差异,显示出区域及半球或全球尺度上粉尘输送方式的不同。  相似文献   

The effects of different sea surface temperature distributions over the western Pacific on the summer monsoon properties   总被引：8，自引：0，他引：8  

Qian Yongfu 《海洋学报(英文版)》1993,12(4):535-547

A modified and improved primitive equation numerical model with p-sigma incorporated vertical coordinates is used to simulate the effects of different sea surface temperature distributions over the western Pacific on the summer monsoon properties. The different sea surface temperature (SST) distributions are automatically generated in the time integrations by using two different SST models, one of which is called the deep ocean model (DOM) and the other the shallow ocean model (SOM). The SST generated by the DOM has the distribution pattern of the initial SST which is similar to the pattern in the cold water years over the western Pacific, while the SST generated by the SOM has the pattern similar to that in the warm water years. The differences between the experimental results by using DOM and SOM are analyzed in detail. The analyses indicate that the most basic and important characteristics of the summer monsoon climate can be simulated successfully in both experiments, that means the climatic propert  相似文献   

大亚湾大鹏澳夏季余流的分析     

吴日升  李立 《台湾海峡》1993,12(1):48-54

1989年夏季在广东大亚湾大鹏澳进行了近2个月的海流锚系观测。本文报道观测结果,并利用谱和经验正交函数分析法研究余流的特性。结果表明,1989年夏季溴内有一弱气旋环流,但存在相当强的低频流.低频流以E-W 方向为主,能量集中在8～16d 和4～5d 频带上,其主分量表现为溴口南部同北部位相相反的低频水平环流。低频流与当地风场有明显的关系。  相似文献