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Synoptic-scale disturbances over the northern South China Sea and their responses to El Nio

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Acta Oceanologica Sinica 2012年第5期31卷 69-78页

作者： ZENG Lili LI Xixi DU Yan SHI Rui YAO Jinglong WANG Dongxiao sui dandan State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China South China Sea Marine Prediction Center South China Sea BranchState Oceanic AdministrationGuangzhou 510300China

Using surface and aerological meteorological observations obtained at the Xisha Automatic Weather Station and three moored buoys along the continental slope, characteristics of the synoptic-scale disturbances over the northern South China Sea （NSCS） are extensively studied. The power spectra of surface and aerological observations suggest a synoptic feature with a pronounced energy peak at a period of 5–8 d and a weak peak at 3–4 d. The standard deviation of the synoptic temperature component derived at Xisha Station from 1976 to 2011 indicates that the strongest variability normally exists in August all through the whole troposphere. At the interannual scale, it is found that El Nin o plays an important role in regulating the synoptic disturbances of atmosphere. The vertical synoptic disturbances have a double active peak following El Nin o condition. The first peak usually occurs during the mature phase of El Nin o, and the second one occurs in the summer of decay year. Comparing with the summer of developing years, the summer of the decaying year of El Nin o has more active and stronger synoptic disturbances, especially for the 5–8 d period variations.

关键词： northern South China Sea synoptic-scale disturbances El Nin o aerological meteorological observation

Contrasting dynamic characteristics of shear turbulence and Langmuir circulation in the surface mixed layer

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Acta Oceanologica Sinica 2015年第5期34卷 1-11页

作者： LI Guojing WANG Dongxiao CHEN Ju YAO Jinglong ZENG Lili SHU Yeqiang sui dandan State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of Sciences

Large eddy simulation （LES） is used to investigate contrasting dynamic characteristics of shear turbulence （ST） and Langmuir circulation （LC） in the surface mixed layer （SML）. ST is usually induced by wind forcing in SML. LC can be driven by wave-current interaction that includes the roles of wind, wave and vortex forcing. The LES results show that LC suppresses the horizontal velocity and greatly modifies the downwind velocity profile, but increases the vertical velocity. The strong downweUing jets of LC accelerate and increase the downward transport of energy as compared to ST. The vertical eddy viscosity Km of LC is much larger than that of ST. Strong mixing induced by LC has two locations. They are located in the 26s-36s （Stokes depth scale） and the lower layer of the SML, respectively. Its value and position change periodically with time. In contrast, maximum Km induced by ST is located in the middle depth of the SML. The turbulent kinetic energy （TKE） generated by LC is larger than that by ST. The differences in vertical distributions of TKE and Krn are evident. Therefore, the parameterization of LC cannot be solely based on TKE. For deep SML, the convection of large-scale eddies in LC plays a main role in downward transport of energy and LC can induce stronger velocity shear （S2） near the SML base. In addition, the large-scale eddies and Sz induced by LC is changing all the time, which needs to be fully considered in the parameterization of LC.

关键词： surface mixed layer Langmuir circulation shear turbulence large eddy simulation

Progress of regional oceanography study associated with western boundary current in the South China Sea

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Chinese Science Bulletin 2013年第14期58卷 1205-1215页

作者： WANG DongXiao LIU QinYan XIE Qiang HE ZhiGang ZHUANG Wei SHU YeQiang XIAO XianJun HONG Bo WU XiangYu sui dandan State Key Laboratory of Tropical Oceanography South China Sea Institute of Oceanology Chinese Academy of Sciences Sanya Institute of Deep-sea Science and Engineering Chinese Academy of Sciences College of Ocean and Earth Sciences Xiamen University National Climate Center Chinese Meteorological Administration Virginia Institute of Marine Science College of William and Mary National Marine Environmental Forecasting Center State Oceanic Administration

Recent progress of physical oceanography in the South China Sea (SCS) associated with the western boundary current (WBC) and eddies is reviewed in this paper. It includes Argo observations of the WBC, eddy detection in the WBC based on satellite images, cross-continental shelf exchange in the WBC, eddy-current interaction, interannual variability of the WBC, air-sea interaction, the SCS throughflow (SCSTF), among others. The WBC in the SCS is strong, and its structure, variability and dynamic processes on seasonal and interannual time scales are yet to be fully understood. In this paper, we summarize progresses on the variability of the WBC, eddy-current interaction, air-sea interaction, and the SCSTF achieved in the past few years. Firstly, using the drifting buoy observations, we point out that the WBC becomes stronger and narrower after it reaches the central Vietnam coast. The possible mechanisms influencing the ocean circulation in the northern SCS are discussed, and the dynamic mechanisms that induce the countercurrent in the region of northern branch of WBC in winter are also studied quantitatively using momentum balance. The geostropic component of the WBC was diagnosed using the ship observation along 18°N, and we found that the WBC changed significantly on interannual time scale. Secondly, using the ship observations, two anti-cyclonic eddies in the winter of 2003/2004 in the northern SCS, and three anti-cyclonic eddies in the summer of 2007 along 18°N were studied. The results show that the two anti-cyclonic eddies can propagate southwestward along the continental shelf at the speed of first Rossby wave (～0.1 ms-1 ) in winter, and the interaction between the three anti-cyclonic eddies in summer and the WBC in the SCS is preliminarily revealed. Eddies on the continental shelf of northern SCS propagated southeastward with a maximum speed of 0.09 ms-1 , and those to the east of Vietnam coast had the largest kinetic energy, both of which imply strong interact

关键词：南海区域物理海洋学西边界流中国南海南海北部大陆架海气相互作用年际时间尺度 Rossby波

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Hydrographic field investigations in the Northern South China Sea by open cruises during 2004-2013

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Science Bulletin 2015年第10期60卷 607-615,M0003页

作者： Lili Zeng Qiang Wang Qiang Xie Ping Shi Lei Yang Yeqiang Shu Ju Chen dandan sui Yunkai He Rongyu Chen Dongxiao Wang State Key Laboratory of Tropical Oceanography South China Sea Institute of Oceanology Chinese Academy of SciencesGuangzhou 510301 China Sanya Institute of Deep-Sea Science and Engineering Chinese Academy of Sciences Sanya 572000 China

In the past 10 years （2004-2013）, annual open cruise during late summer provided new opportunities for comprehensive studies in the Northern South China Sea （NSCS）. The 10-year field investigation program was carried out by the South China Sea Institute of Oceanology, Chinese Academy of Sciences （SCSIO, CAS）. Measurements inclu- ded water mass property, ocean circulation, atmospheric structure, and chemical and biological elements. The observation data collected during these open cruises have been intensively used in the studies of marine oceanographic, meteorological, chemical, and biological processes in the NSCS. In this study, comprehensive assessment of data application in oceanographic and meteorological studies is provided：（1） the property and variability of water masses in different layers; （2） the distribution of main currents and three-dimensional structure of mesoscale eddies; and （3） atmospheric structure and its feedback to the ocean. With the continuance of open cruises, it is feasible to construct high- quality, gridded climatological marine meteorological datasets in the NSCS in the near future.

关键词： Northern South China Sea Dataapplication Water mass property Ocean circulation Atmospheric structure

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南海潜热交换年际与年代际变化的分析探讨

海洋学报 2012年第4期34卷 27-34页

作者：隋丹丹谢强王东晓中国科学院南海海洋研究所热带海洋环境国家重点实验室广东广州51001 中国科学院三亚深海科学与工程研究所海南三亚572000

根据一套客观分析潜热通量、基于绕岛理论诊断的南海贯穿流(LST)、南海热含量等月平均资料,分析南海表层潜热通量的年际和年代际变化特征。南海地区的潜热通量冬季强,春季的潜热通量弱;在秋冬季节,南海北部的潜热通量远大于南部;夏季南... 详细信息

根据一套客观分析潜热通量、基于绕岛理论诊断的南海贯穿流(LST)、南海热含量等月平均资料,分析南海表层潜热通量的年际和年代际变化特征。南海地区的潜热通量冬季强,春季的潜热通量弱;在秋冬季节,南海北部的潜热通量远大于南部;夏季南海潜热通量南部高于北部;从20世纪80年代初潜热通量逐渐增加。使用EOF经验正交分解,M-K检验方法分析南海潜热通量的多时间尺度变化,前3个模态的方差贡献率分别为:53.01%(主要为长期趋势)、17.4%(年代际变化)、6.71%(年际变化)。分析表明在年际尺度上南海贯穿流(LST)减少导致南海海表温度(SST)增温幅度上升,海气温差比湿差减小,从而导致潜热释放减少,潜热通量呈负异常;反之LST进入南海增多,海气温差比湿差变大,导致南海潜热损失减少,潜热通量呈正异常。

关键词：南海潜热通量南海贯穿流热含量年际年代际

无支持电解质条件下连续流电化学合成三氟甲基化氧化吲哚

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有机化学 2023年第9期43卷 3239-3245页

作者：岁丹丹岑南楠龚若蕖陈阳陈文博上海电力大学环境与化学工程学院、上海市电力材料防护与新材料重点实验室上海200090 中国科学院上海有机化学研究所、中国科学院能量调控材料重点实验室上海200032

发展了一种无支持电解质条件下连续流电化学合成三氟甲基化氧化吲哚的方法.各种N-芳基丙烯酰胺可以与CF_(3)SO_(2)NHNHBoc反应,以中等收率得到相应的产物.无需改变条件很容易实现反应放大,显示了连续流电化学合成的应用潜力.

关键词：三氟甲基电化学合成连续流氧化吲哚绿色化学

寒潮过程和海洋锋面影响南海西北部大气波导演变的个例分析

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热带海洋学报 2022年第5期41卷 29-42页

作者：石睿陈举何云开隋丹丹舒业强热带海洋环境国家重点实验室(中国科学院南海海洋研究所) 广东广州510301 南方海洋科学与工程广东省实验室(广州) 广东广州511458 海南西沙海洋环境国家野外科学观测研究站(中国科学院南海海洋研究所) 广东广州510301 仪器设备公共服务中心(中国科学院南海海洋研究所) 广东广州510301

文章利用2012年冬季南海西北部的航次探空资料,研究了寒潮过程和海洋锋面对大气波导特征演变的共同影响。文中观测发现,航次期间的大气波导以悬空波导为主,平均波底高度约738.64m,平均厚度约185.17m,平均强度10.21M单位。观测前期,天气... 详细信息

文章利用2012年冬季南海西北部的航次探空资料,研究了寒潮过程和海洋锋面对大气波导特征演变的共同影响。文中观测发现,航次期间的大气波导以悬空波导为主,平均波底高度约738.64m,平均厚度约185.17m,平均强度10.21M单位。观测前期,天气形势稳定,东北季风较弱,在锋面暖水区一侧的悬空波导较为深厚,且高度较低。其主要成因是大气边界层顶部925hPa至850hPa高度左右存在深厚的逆温层,且具有显著的日变化特征。航次中期的寒潮过程导致东北季风大幅增强,使得大气边界层顶部的逆温层被破坏,从而导致悬空波导显著变薄变弱。而锋面冷水区一侧,低水温抑制湍流发展导致大气修正折射率(M)的负梯度扰动较弱,较难形成稳定且有一定强度的波导层,且无显著日变化。但当东南暖湿气流覆盖锋面冷水区上空时,容易形成较稳定的表面波导。

关键词：南海大气波导海洋锋面寒潮探空大气边界层日变化

金属掺杂对TiO_2光催化还原CO_2制甲酸甲酯活性的影响

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化工新型材料 2012年第8期40卷 79-81页

作者：李会亮尹晓红隋丹丹董虹志天津理工大学化学化工学院天津300384

采用溶胶-凝胶法制备掺杂金属改性的TiO2光催化剂,并研究其光催化还原CO2制甲酸甲酯的反应效果。以钛酸丁酯为主要原料,制备纳米TiO2。通过改变金属掺杂量、焙烧温度、前躯体pH等,确定出适宜的催化剂制备条件。结合SEM、XRD、UV-vis等... 详细信息

采用溶胶-凝胶法制备掺杂金属改性的TiO2光催化剂,并研究其光催化还原CO2制甲酸甲酯的反应效果。以钛酸丁酯为主要原料,制备纳米TiO2。通过改变金属掺杂量、焙烧温度、前躯体pH等,确定出适宜的催化剂制备条件。结合SEM、XRD、UV-vis等对催化剂进行了形貌、结构和吸光行为的表征。进而考察了其光催化还原CO2的活性。结果表明:溶胶-凝胶法制备掺杂金属的TiO2,可使金属均匀地分布于TiO2表面,经催化活性评价,获得适宜的掺杂元素和掺杂量,优选的制备条件为溶胶pH=2.5～3、凝胶焙烧温度500℃,在催化剂用量1mg/mL,光照强度2880μw/cm2的反应条件下,可有效地促进TiO2光催化还原CO2制甲酸甲酯。

关键词：溶胶-凝胶法纳米TiO2 光催化 CO2还原

黑潮入侵南海的强弱与太平洋年代际变化及厄尔尼诺-南方涛动现象的关系

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海洋学报 2014年第7期36卷 17-26页

作者：杨龙奇许东峰徐鸣泉隋丹丹吴品煌国家海洋局第二海洋研究所卫星海洋环境动力学国家重点实验室浙江杭州310012 福州市海洋与渔业技术中心福建福州350026 中国科学院南海海洋研究所热带海洋环境国家重点实验室广东广州510301

在黑潮入侵南海强弱的问题上,到底是太平洋年代际变化(Pacific Decadal Oscillation,PDO)还是厄尔尼诺-南方涛动(El Nio-Southern Oscillation,ENSO)现象在起关键作用,目前还存在着较大争议。本文先以高盐水作为黑潮入侵强弱的示踪物,... 详细信息

在黑潮入侵南海强弱的问题上,到底是太平洋年代际变化(Pacific Decadal Oscillation,PDO)还是厄尔尼诺-南方涛动(El Nio-Southern Oscillation,ENSO)现象在起关键作用,目前还存在着较大争议。本文先以高盐水作为黑潮入侵强弱的示踪物,用120°E断面的高盐水数据和北赤道流分叉点(North Equator Current Bifurcation,NEC-Y)的南北变动进行相关分析,接着,进一步用学者所用的黑潮入侵指数(KI指数,Kuroshio intrusion index和NEC指数,North Equatorial Current index)与北赤道流分叉点南北变动进行相关分析。最后,用EMD(Empirical Mode Decomposition)方法和相关关系分析法分别分析了PDO指数、Nio3.4指数与北赤道流分叉点南北变动的关系并用NECP风场数据探讨其影响机制。结果表明:(1)通过对120°E断面的高盐水的KI指数、NEC指数与NEC-Y的相关分析,表明了北赤道流分叉点的南北变动能够很好地指代黑潮入侵南海的强弱;(2)通过PDO指数和Nio3.4指数与北赤道流分叉点的南北变动的相关性分析,发现PDO指数、Nio3.4指数与北赤道流分叉点的南北变动都具有较好的相关性,都在0.5水平。这些良好的相关性表明了PDO和ENSO对黑潮入侵南海的强弱都具有重要的影响;(3)当处于厄尔尼诺年(拉尼娜)时,赤道太平洋发生西(东)风异常,使得北赤道流分叉点偏北(南),使吕宋岛东侧的黑潮流速减弱(加强),黑潮入侵南海增强(减弱);当PDO处于暖(冷)阶段时,会加强热带太平洋的西(东)风异常,使得黑潮入侵南海增强(减弱)。

关键词：黑潮入侵北赤道流分叉点太平洋年代际变化厄尔尼诺-南方涛动