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The ear-shaped thermal front(ESTF), formed by the convergence of the Yellow Sea Warm Current(YSWC) and the Shandong Coastal Current(SCC), is a very important oceanic phenomenon in the Yellow Sea(YS) in winter. In situ measurements and reanalysis datasets all demonstrate that the ESTF has been weakening during1950s–1990s, and a similar weakening trend is also found in winter monsoon over the YS. Numerical experiments show that the weakening of winter monsoon can induce an anomalous circulation in the YS on multi-decadal timescale with northward anomalous currents along China's coast and southward anomalous currents in the central YS—generally opposite to seasonal mean circulation. The anomalous circulation causes slowdown of the YSWC and the SCC, and thus weakens the ESTF. Since the ESTF plays important roles in regional ocean dynamics and air-sea interactions, its weakening has important implications for regional climate in the YS in winter. 相似文献
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南黄海悬浮体的垂直分布特性及其指示意义 总被引:3,自引:0,他引:3
重点研究了南黄海典型断面的悬浮体垂直分布特性及其指示意义。结果表明:四季南海黄海北部断面悬浮体分布的共同特征是西高东低,冬、春季鲁北沿岸流携带悬浮体向南输运和黄海暖流北上是南黄海与北黄海进行物质交换的重要方式和途径;夏半年南黄海中部断面深水域存在的表层云团状悬浮体高值区或"中层悬浮体最大值"现象与该海域的生物活动具有密切的联系;冬、春季苏北浅滩外侧海域近岸区的悬浮体含量显著高于夏、秋季,且冬半年近岸区的悬浮体具有向外海输运的趋势;长江口东北部断面各季节均存在2个悬浮体高值区,其中位于断面西部近岸海域的高值区与长江冲淡水(夏季)或苏北沿岸水(冬季)的影响有关,位于断面东部深水域处的悬浮体高值区是黄海西部沿岸流物质输运的结果,并与济州岛西南部海域的泥质区总体相对应,黄海与东海的物质交换过程主要通过夏季长江冲淡水东北向扩展与冬半年黄海西部沿岸流南下和黄海暖流北上进行。另外,水体层化和陆架锋也显著影响着南黄海悬浮体的垂直分布状况,锋面是控制夏季悬浮体向外海深水区输运的主要物理机制。 相似文献
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海表层二氧化碳分压之时间序列研究进展 总被引:1,自引:0,他引:1
简要总结了海表层二氧化碳分压(pCO2)时间序列的研究方法,重点综述了时间序列研究在确定pCO2控制过程、揭示pCO2年际差异、监测气候事件对pCO2的影响及估算海—气二氧化碳(CO2)通量等方面的研究进展.海表层pCO2时间序列的研究方法大致可以分为2类,一类是基于船舶调查,另一类是基于浮标的CO2自动测定.时间序列研究除了能够定性地记录和追踪一些特殊和偶然的物理和生物过程对pCO2的影响外,还能够定量地给出各种过程对pCO2变化的贡献,这对揭示海洋pCO2的控制机理有着重要意义.年际尺度的时间序列观测表明:人类活动已经造成了海表层pCO2的增加,厄尔尼诺事件和拉尼娜事件对海表层pCO2和海—气CO2通量有明显影响.另外,时间序列研究能够提高海—气CO2通量估算的准确性. 相似文献
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During the summer of 2012, the fifth CHINARE Arctic Expedition was carried out, and a submersible mooring system was deployed in M5 station located at(69°30.155'N,169°00.654'W) and recovered 50 d later. A set of temperature, salinity and current profile records was acquired. The characteristics of these observations are analyzed in this paper. Some main results are achieved as below.(1) Temperature generally decreases while salinity generally increases with increasing depth. The average values of all records are 2.98°C and 32.21 psu.(2)Salinity and temperature are well negatively correlated, and the correlation coefficient between them is –0.84.However, they did not always vary synchronously. Their co-variation featured different characters during different significant periods.(3) The average velocity for the whole water column is 141 mm/s with directional angle of347.1°. The statistical distribution curve of velocity record number gets narrower with increasing depth. More than85% of the recorded velocities are northward, and the mean magnitudes of dominated northward velocities are100–150 mm/s.(4) Rotary spectrum analysis shows that motions with low frequency take a majority of energy in all layers. The most significant energy peaks for all layers are around 0.012 cph(about 3.5 d period), while the tidal motion in mooring area is nonsignificant.(5) Velocities in all layers feature similar and synchronous temporal variations, except for the slight decrease in magnitude and leftward twist from top to bottom. The directions of velocity correspond well to those of surface wind. The average northward volume transport per square meter is0.1–0.2 m3/s under southerly wind, but about –0.2 m3/s during northerly wind burst. 相似文献
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基于声学方法的南黄海浮游动物垂直迁移季节变化研究 总被引:2,自引:1,他引:1
为研究南黄海浮游动物垂直迁移的季节变化, 分析了2006 年至2007 年4 个季节布放潜标中声学测流仪的观测数据。结果是: 声学测流仪测量的后向散射强度呈现显著的日变化特征, 这是由浮游动物垂直迁移造成的; 在4 个季节中都出现这一凌晨向下、黄昏向上的垂直迁移, 但是垂直迁移发生的时间有季节变化。利用南黄海辐射通量的直接观测数据, 讨论了垂直迁移发生时间与光照的关系,结果表明垂直迁移的季节变化主要受光照的影响。这对于研究浮游动物垂直迁移机制有一定意义。 相似文献
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2008年孟加拉湾春季暖池生消过程的热收支诊断分析 总被引:1,自引:1,他引:0
在夏季风爆发前孟加拉湾会出现季节性暖池,在季风爆发后它则快速消失。本文利用RAMA浮标阵列中孟加拉湾中部浮标的观测资料,通过进行混合层热收支诊断,对2008年孟加拉湾春季暖池的生消过程进行了分析。结果表明:热通量项主导了暖池的生成和消亡过程,它在暖池生成期表现为强加热效应,而在暖池消亡期变为强冷却效应;垂向卷夹的冷却作用在暖池生成阶段比较突出;温度平流项的冷却作用在冬季较强。对热通量项的进一步分析表明:短波辐射平均热效应在暖池生成期高达0.32℃/d,而在暖池消亡期降低一半,这是使热通量项在两个时期有不同表现的根本原因;潜热通量在各阶段的平均冷却效应基本保持不变,都在-0.14℃/d左右;长波辐射的冷却效应在暖池生成期比较显著,一定程度上减缓了海温的上升速度;感热通量的热效应相对较小。 相似文献