Field-observation for an anticyclonic mesoscale eddy consisted of twelve gliders and sixty-two expendable probes in the northern South China Sea during summer 2017     

Yeqiang SHU  Ju CHEN  Shuo LI  Qiang WANG  Jiancheng YU  Dongxiao WANG 《中国科学:地球科学(英文版)》2019,(2)

An intensive field observation experiment using 12 Chinese gliders equipped with conductivity-temperature-depth (CTD) sensors and 62 expendable CTD probes (XCTDs) was performed to investigate the 3-D structure and time evolution of an anticyclonic eddy in the northern South China Sea (NSCS). The observed results showed that the anticyclonic eddy had a horizontal radius of about 80 km at surface and a vertical depth of impact of more than 1000 m. The largest temperature and salinity anomalies compared with the averaged values of the temperature and salinity profiles were 3.5°C and 0.4 psu at 120 m depth, respectively. Combined analysis of altimeter sea level and water mass properties indicated that the anticyclonic eddy was shed from the Kuroshio loop current. The vertical axis of the anticyclonic eddy tilted from surface to the observed maximum depth (1000 m) along its translation direction against the 2000 m isobath. The center of the anticyclonic eddy remained in the region east of Dongsha Island for more than half a month. During this time, the long axis direction of the eddy changed from across the slope to along the slope. Then, the eddy moved southward along the 2000 m isobaths. Both the geostrophic current and temperature distribution revealed that the eddy intensity weakened during the observation period gradually. These observations indicated strong interaction between the anticyclonic eddy and the slope topography of Dongsha Island.  相似文献   

太平洋中的主要起伏模态     

彭启华  黄瑞新  王卫强  王东晓 《热带海洋学报》2020,39(2):1-10

对海洋中起伏运动(heaving)信号的时空分布研究能够帮助我们更好地了解气候系统中的年际和年代际变率。文章通过再分析资料和模式对太平洋区域的heaving主要模态进行了研究。研究结果表明: 太平洋区域主要存在两种heaving模态: 第一模态主要表现为赤道东西两侧的温跃层异常信号反位相; 第二模态表现为赤道区域和副热带区域的温跃层异常信号呈现反位相变化的规律。本文对这两个主要heaving模态所涉及的物理过程进行详细讨论, 结果表明: 东西反位相模态主要是受赤道波动调节的结果; 而经向结构模态则主要是由赤道地区的波动和副热带区域的风应力旋度异常作用共同导致。此外, 我们还讨论了heaving模态可以通过海洋波动以及Ekman输送等过程对海盆尺度的热输送(振幅约为5×10¹⁴W)以及海洋热含量(振幅约为1.5×10²⁰J)的再分配起到了关键的调制作用, 进一步表明heaving模态对全球气候变化有着重要的作用。  相似文献   

Statistical modeling and CMIP5 simulations of hot spell changes in China     

Weiwen Wang  Wen Zhou  Yun Li  Xin Wang  Dongxiao Wang 《Climate Dynamics》2015,44(9-10):2859-2872

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河南省新县付冲一带Mo的地球化学异常特征及找矿效果          下载免费PDF全文

李诗言  徐春林  王东晓 《地质找矿论丛》2015,30(3):417-421

河南省新县付冲一带位于东秦岭—大别山造山带中东部。通过分析研究区内Mo等元素的地球化学分布富集特征,讨论了元素组合特点及相关性;通过对比1∶5万水系沉积物测量Mo异常和1∶1万土壤地球化学测量Mo异常,认为Mo异常重现性好,且伴生Ag,Pb,W等元素组合,具水平分带现象,呈斑岩型钼矿异常特点。研究区内以化探工作成果为重要依据进行工程验证,共发现7条钼矿体,找矿效果较好,且有进一步找矿的潜力。  相似文献   

Teleconnected influence of North Atlantic sea surface temperature on the El Ni?o onset     

Xin Wang  Chunzai Wang  Wen Zhou  Dongxiao Wang  Jie Song 《Climate Dynamics》2011,37(3-4):663-676

Influence of North Atlantic sea surface temperature (SST) anomalies on tropical Pacific SST anomalies is examined. Both summer and winter North Atlantic SST anomalies are negatively related to central-eastern tropical Pacific SST anomalies in the subsequent months varying from 5 to 13?months. In particular, when the North Atlantic is colder than normal in the summer, an El Ni?o event is likely to be initiated in the subsequent spring in the tropical Pacific. Associated with summer cold North Atlantic SST anomalies is an anomalous cyclonic circulation at low-level over the North Atlantic from subsequent October to April. Corresponded to this local response, an SST-induced heating over the North Atlantic produces a teleconnected pattern, similar to the East Atlantic/West Russia teleconnection. The pattern features two anticyclonic circulations near England and Lake Baikal, and two cyclonic circulations over the North Atlantic and near the Caspian Sea. The anticyclonic circulation near Lake Baikal enhances the continent northerlies, and strengthens the East-Asian winter monsoon. These are also associated with an off-equatorial cyclonic circulation in the western Pacific during the subsequent winter and spring, which produces equatorial westerly wind anomalies in the western Pacific. The equatorial westerly wind anomalies in the winter and spring can help initiate a Pacific El Ni?o event following a cold North Atlantic in the summer.  相似文献   

Different roles of Ekman pumping in the west and east segments of the South China Sea Warm Current   总被引：3，自引：2，他引：1  

WANG Qiang  WANG Yinxi  BO Hong  ZHOU Weidong  WANG Dongxiao 《海洋学报(英文版)》2011,30(3):1-13

A three-dimensional model is used to investigate the mechanism of the South China Sea (SCS) winter counter-current (also known as the SCS Warm Current,or the SCSWC),which flows against the wind.The model can reproduce the structure of the band-like currents over the northern shelf of the SCS,including the westward coastal current and slop current,and the SCSWC sandwiched in between.Sensitivity experiments are designed to understand the different roles of Ekman pumping of the SCSWC at different longitude.The results show that the Ekman pumping drives the SCSWC in the west segment.In the east,it is not the Ekman pumping but the intrusion of the Kuroshio that drives the SCSWC.  相似文献   

Extended Impact of Cold Air Invasions in East Asia in Response to a Warm South China Sea and Philippine Sea     

Marco Y.-T.LEUNG  Dongxiao WANG  Wen ZHOU  Yuntao JIAN 《大气科学进展》2023,40(3):531-540

During boreal winter, the invasion of cold air can lead to remarkable temperature drops in East Asia which can result in serious socioeconomic impacts. Here, we find that the intensity of strong synoptic cold days in the East China Sea and Indochina Peninsula are increasing. The enhanced synoptic cold days in these two regions are attributed to surface warming over the South China Sea and Philippine Sea(SCSPS). The oceanic forcing of the SCSPS on the synoptic cold days in the two regions is veri...  相似文献   

夏季南海西部中尺度物理过程对营养盐和叶绿素a分布特征的影响   总被引：1，自引：1，他引：0  

冷晓云  杨阳  孙军  张桂成  徐文喆  冯媛媛  郭术津  陈建芳  王东晓 《海洋学报》2016,38(4):66-75

通过对2014年8月31日-9月26日国家自然科学基金委南海西部综合航次的调查结果分析,发现在中南半岛沿岸海域存在具有低温高盐的冷涡和位于其东南部海域具有高温低盐的暖涡。相对于暖涡和其他海域,冷涡水团含有更高的营养盐,并在50 m、75 m和100 m层增加明显,DIP分别高0.21 μmol/L、0.39 μmol/L和0.23 μmol/L,DIN分别高4.94 μmol/L、7.56 μmol/L和3.76 μmol/L,DSi分别高2.55 μmol/L、5.25 μmol/L和3.46 μmol/L,说明冷涡对提高初级生产力具有明显的营养优势条件和巨大潜力;叶绿素a最大值均出现在50 m层,其中以海南岛近岸海域最大,冷涡在25 m层提高初级生产力明显,主要是受营养盐影响显著;而在75 m、100 m层可能受到冷涡带来的低温环境而导致叶绿素a含量不高。  相似文献   

东印度洋细菌类群水平与垂直分布初探   总被引：1，自引：0，他引：1  

王静  阚金军  BORECKI Laur  张晓东  王东晓  孙军 《海洋学报(英文版)》2016,35(6):85-93

作为海洋食物网的重要组成部分,微生物在海洋的生物化学循环以及能量和元素流动中起着重要的作用。目前对东印度洋中微生物的种群结构和分布知之甚少。本研究运用分子生物学手段,包括多聚酶链式反应-变形梯度凝胶电泳(PCR-DGGE)技术和高通量测序技术,对东印度洋的赤道区域以及邻近的孟加拉湾区域水体中细菌的16S rRNA基因进行了探索。结果表明,Bacteroidetes, Proteobacteria (Alpha和Gamma类群), Actinobacteria, Cyanobacteria和Planctomycetes为研究区域微生物的主要类群。通过PCR-DGGE,发现微生物类群具有显著的水平分布模式;进一步的高通量测序的结果更加清晰的显示出细菌类群的垂直分布模式:相对其他两层,Cyanobacteria和Actinobacteria在25米水层出现更多;Bacteroidetes在25m和150m为主要类群,而在75m水层相对较少;Proteobacteria (主要为Alphaproteobacteria)类群在75m水层为优势类群。随着水层的加深,不同站位的细菌类群组成趋于一致。结果表明高通量测序能够把占据微小部分的微生物类群区分出来。本研究是针对东印度洋水体中细菌的水平和垂直分布以及多样性信息的首次报道,研究结果对于进一步发现潜在微生物功能类群以及探索这些微生物在东印度洋中的能量和物质循环中的作用有所帮助。  相似文献   

石城断裂性质与活动情况简介     

李怀永  郭东晓 《城市地质》2010,5(2):45-46

本文简单总结与介绍了怀柔—密云境内,石城断裂的规模、性质与活动性。初步认为该断裂属脆韧性剪切带,与云蒙山岩体上侵有关,早期压性,晚期显张性,属非全新世活动断裂,对工程影响程度低。  相似文献