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1.
Future temperature distributions of the marginal Chinese seas are studied by dynamic downscaling of global CCSM3 IPCC_AR4 scenario runs.Different forcing fields from 2080-2099 Special Report on Emissions Scenarios(SRES) B1,A1,and A2 to 1980-1999 20C3M are averaged and superimposed on CORE2 and SODA2.2.4 data to force high-resolution regional future simulations using the Regional Ocean Modeling System(ROMS).Volume transport increments in downscaling simulation support the CCSM3 result that with a weakening subtropical gyre circulation,the Kuroshio Current in the East China Sea(ECS) is possibly strengthened under the global warming scheme.This mostly relates to local wind change,whereby the summer monsoon is strengthened and winter monsoon weakened.Future temperature fluxes and their seasonal variations are larger than in the CCSM3 result.Downscaling 100 years’ temperature increments are comparable to the CCSM3,with a minimum in B1 scenario of 1.2-2.0°C and a maximum in A2 scenario of 2.5-4.5°C.More detailed temperature distributions are shown in the downscaling simulation.Larger increments are in the Bohai Sea and middle Yellow Sea,and smaller increments near the southeast coast of China,west coast of Korea,and southern ECS.There is a reduction of advective heat north of Taiwan Island and west of Tsushima in summer,and along the southern part of the Yellow Sea warm current in winter.There is enhancement of advective heat in the northern Yellow Sea in winter,related to the delicate temperature increment distribution.At 50 meter depth,the Yellow Sea cold water mass is destroyed.Our simulations suggest that in the formation season of the cold water mass,regional temperature is higher in the future and the water remains at the bottom until next summer.In summer,the mixed layer is deeper,making it much easier for the strengthened surface heat flux to penetrate to the bottom of this water. 相似文献
2.
Tidal current observation in the southern Yellow Sea in the summers of 2001 and 2003 总被引：1，自引：0，他引：1
Direct current observations in the Yellow Sea interior are very scarce due to intense fishing and trawling activities. Most previous studies on tides in the area were based on coastal measurements or satellite altimeter sea levels and have not been rigorously compared with direct measurements. In this paper, tidal currents are studied with current profiles from three bottom-moored Sontek Acoustic Doppler Profilers （ADPs） deployed in the southern Yellow Sea in summer of 2001 and 2003. The measured current series were dominated by tidal currents. Maximum velocities are between 40-80 cm/s at the mooring stations. M2 current is the most dominant primary tidal constituent, while MS4 and M4 are the most significant shallow water tides with much smaller amplitudes than the primary tides. 相似文献
3.
A complete set of one-month Acoustic Doppler Profiler (ADP) current data at a station in the southern Yellow Sea (SYS) is analyzed using the rotary spectrum method. The results revealed different rotary properties between barotropic and baroclinic tidal currents. The barotropic and baroclinic tidal currents rotate elliptically counter-clockwise and clockwise, respectively. Meanwhile, baroclinic bottom tidal currents are almost along-isobath. The baroclinic cross-isobath velocities attenuate quickly at the bottom, implying important effects of bottom topography on the cross-isobath motions. 相似文献
4.
长江口邻近海域夏、冬季水文特征分析 总被引：9，自引：0，他引：9
长江冲淡水和台湾暖流是我国陆架海上两个重要的海洋现象。二者在长江口邻近海域交汇并相互制约,其分布和变化控制着该地区的温盐、环流结构,也影响着长江径流所携带的泥沙、营养盐等物质向外海的扩散和输运,以及舟山渔场的形成和变化。 长江每年以巨量径流注入东海,在长江口外形成一股很强的冲淡水,以低盐、高营养盐、高悬浮体含量为特征。毛汉礼等(1963)首先对长江冲淡水的扩散与混合特征作了系统的描述,并指出,冬季长江冲淡水沿岸南下,其范围仅限于贴岸的一狭带内;夏季则在径流入海后不久转向东北,直指济州岛方向,到达对马海峡。众多学者通过资料分 相似文献
5.
舟山渔场及其邻近海域水团的季节特征 总被引：5，自引：0，他引：5
根据2001年夏季和2002年冬季两次现场调查所收集的CTD和营养盐资料,利用模糊聚类分析法,对舟山渔场及其邻近海域水团的季节特征进行了分析.结果表明,舟山渔场及其邻近海域水团的配置、分布范围、温盐特性和营养盐含量都有明显的季节特征.其中,冬季在全海域共有3个水团(江浙沿岸水、台湾暖流表层水和黄海混合水),而夏季则存在4个水团(江浙沿岸水、台湾暖流表层水、台湾暖流深层水和黄海混合水);冬季,江浙沿岸水的分布范围较小,温度偏低,盐度略高,营养盐偏高,而夏季,其分布范围较大,温度偏高,盐度偏低,营养盐偏低;冬季,台湾暖流表层水北伸最强,厚度最厚,温度最低,盐度最高,硅酸盐和硝酸盐偏高,而夏季,则北伸最弱,厚度最薄,温度最高,盐度最低,硅酸盐和硝酸盐偏低;台湾暖流深层水是一个季节性水团,它含有较丰富的营养盐;黄海混合水的分布范围和营养盐含量也都呈现出明显的季节特征. 相似文献
6.
利用SODA海洋同化资料和NCEP再分析大气资料,分析了热带太平洋次表层海温异常(subsurfaceoceantemperatureanomaly,SOTA)与厄尔尼诺与南方涛动(ElNi?o-SouthernOscillation,ENSO)循环的联系,及SOTA对大气环流的影响。回顾传统ENSO研究,指出存在的问题,提出了ENSO影响大气研究的新思路,得到以下结果:(1)以SOTA为基本资料的研究发现, ENSO事件有两个模态,主要出现在冬季的第一模态对冬季及夏季亚洲-北太平洋-北美地区上空中高纬大气环流有重要影响,主要出现在夏季的第二模态对该地区上空夏季热带和副热带大气系统有重要作用。(2)ENSO事件通过与ENSO相联系的热带太平洋海面温度异常(ENSO-relatedseasurface temperatureanomaly,RSSTA)对大气的异常热通量输送,强迫Walker环流和Hadley环流变化,导致热带和北太平洋及周边地区上空大气环流异常,进而影响相关地区冬季和夏季的气候。(3)海表面温度异常(seasurfacetemperatureanomaly,SSTA)包含RSSTA和大气异常导致的海温变化(sea temperature anomaly caused by atmospheric anomaly, STA)两部分, RSSTA是ENSO事件过程中海洋内部热动力结构调整导致的海面温度变化,在海洋对大气的热输送过程中,它随ENSO事件演变不断更新;STA是大气受RSSTA海洋异常加热后导致的大气环流异常对海面温度的影响,在海洋浅表层STA对RSSTA有重大影响。本文最后讨论了ENSO事件期间热带海洋对大气热输送过程,指出ENSO事件通过海洋内部热动力结构调整产生RSSTA,它直接对大气异常加热,导致大气环流和气候异常,局地海气之间负反馈过程产生STA,反过来抑制RSSTA。结果还指出,人们常用的SSTA变率实际上主要由秋冬季节RSSTA主导,丢失了春夏季ENSO信息,用SSTA研究ENSO事件存在局限性,这也可能是ENSO事件春季预报障碍的原因之一。 相似文献
7.
长江冲淡水和台湾流是我国陆架海上两个重要的海洋现象。二者在长江口邻近海域交汇并相互制约，其分布和变化控制着该地区的温盐、环流结构，也影响着长江径流所携带的泥沙、营养盐等物质向外海的扩散和输运，以及舟山渔场的形成和变化。
长江每年以巨量径流注入东海，在长江口外形成一股很强的冲淡水，以低盐、高营养盐、高悬浮体含量为特征。毛汉礼等(1963)首先对长江冲淡水的扩散与混合特征作了系统的描述，并指出，冬季长江冲淡水沿岸南下，其范围仅限于贴岸的一狭带内；夏则在径流入海后不久转向东北，直指济州岛方向，到达对马海峡。众多学者通过资料分析、理论研究和数值模拟等探讨了长江冲淡水转向的原因，认为主要影响因素有长江径流量、地形效应、海面风应力、斜压效应、台湾曖流的顶托，以及黄海冷水团的诱导作用等(乐肯堂，1984；崔茂常，1984；顾玉荷，1985；王从敏，1986；赵保仁，1991；朱建荣，1998)，但至今对其转向机制的认识尚不一致。
台湾暖流水起源于台湾海峡和黑潮，是具有高盐、低悬浮体含量特征的大洋水体。翁学传等(1983，1984)研究认为，具有高温和次高盐特征的台湾暖流表层水同时起源于台湾海峡水和黑潮表层水，而具有高盐特征的深层水只来源于由台湾东北部入侵陆架的黑潮次表层水；翁学传(1983)还根据历史资料分析指出，夏季台湾暖流表层水的前锋大体沿着123°E可以伸展到31°N，深层水进一步延伸至31°N以北；且深层水在28°N和30°N断面并不终年存在，仅存于夏半年。王凡等(2001)的分析结果则显示，台湾暖流表层水和深层水在夏季可以在次表层北侵至30°N以北海域，而以深层水特点为主的台湾暖流水在冬季和晚秋甚至可在整个深度上伸展至30°N以北。总之，对台湾暖流水在不同季节、不同层次的北侵程度方面还存在着不同看法。
为深入研究长江口邻近海域的物质通量、扩散、传输和输运规律，中国科学院知识创新工程重要方向项目“中国主要河口及邻近陆架海域陆海相互作用”于2001年7-8月和2002年1月在长江口外28°~32°N、124°E以西海域组织了两次多学科综合考察。作者首先根据这两次考察获得的温盐深观测仪(CTD)观测到的温盐资料和声学多普勒流速剖面仪(ADP、ADCP)流速资料,分析该年夏、冬季长江口邻近海域的水文特征。考虑到调查海域有较强的年际变动，从年际变化的角度来更深刻地认识夏、冬季长江口邻近海域的水文特征，以及长江冲淡水与台湾暖流水的关系是很有必要的。为此，作者收集了1987~2001年其他项目3个夏季航次和2个冬季航次的温盐资料，以及1958~1982年标准断面历史资料，与最近2次观测资料相结合，综合分析研究了长江口邻近海域夏、冬季水文特征和变化情况，为今后更进一步开展此项研究提供了科学依据。 相似文献
8.
Seasonal cycle is the most significant signals of topography and circulation in the Bohai Sea (BS)and Yellow Sea (YS) forced by prevailing monsoon and is still poorly understood due to lack of data in their interiors. In the present study, seasonal cycles of topography in the BS and YS and its relationship with atmospheric forcing and oceanic adjustment were examined and discussed using TOPEX/Poseidon and ERS-I/2 Sea Level Anomalies (SLA) data. Analyses revealed complicated seasonal cycles of topography composed mainly of 2 REOF modes, the winter-summer mode (WlM) and spring-autumn mode (SAM). The WlM with action center in the BS displayed peak and southward pressure gradient in July, and valley and northward pressure gradient in January, which is obviously the direct response to monsoon with about l-month response time. The SAM with action center in the western south YS displayed peak and northward pressure gradient in October and valley and southward pressure gradient in April. After the mature period of monsoon, the action center in the BS becam eweakened while that in the western south YS became strengthened because of regional convergence or divergence induced by seasonal variations of the Taiwan Warm Current and Yellow Sea Coastal Current. The direct response of topography to monsoon resulted in the WIM, while oceanic adjustment of topography played an important role in the forming of the SAM. 相似文献
9.
利用Hadley中心海冰和海表面温度资料集Had ISST和美国国家海洋大气管理局的扩展重建海温(ERSST)海表面温度(sea surface temperature,SST)观测数据,结合政府间气候变化专门委员会(Intergovernmental Panel on Climate Change,IPCC)中CMIP3(Coupled Model Intercomparison Project 3)的24个耦合模式的模拟结果,通过经验正交函数(EOF)分解等方法,对20世纪热带海洋在的SST年际变化进行了分析。结果表明,20世纪热带海洋年际变化的主要规律是ENSO信号,且有持续增强的趋势;热带海盆间存在显著的SST梯度,其长期变化与热带东太平洋显著相关。本文结论有利于理解在全球变暖背景下,海盆间的相互作用对赤道海域气候改变的影响。 相似文献
10.
Warming trend in northern East China Sea in recent four decades 总被引：2，自引：0，他引：2
Global warming has become a notable trend especially since an abrupt climate change in 1976. Response of the East China Sea (ECS) to the global warming trend, however, is not well understood because of sparse long-term observation. In this paper, hydrographic observation data of 1957–1996 are collected and reviewed to study climatological variability in northern ECS. Significant warming trends are found in both summer and winter. In summer, the average SST is about 0.46°C higher during the period of 1977-19... 相似文献