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A numerical model study on the spatial and temporal variabilities of dissolved oxygen in Qinzhou Bay of the northern Beibu Gulf

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Acta Oceanologica Sinica 2024年第6期43卷 49-59页

作者： Gaolei Cheng shiqiu peng Bin Yang Dongliang Lu State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Laboratory for Regional Oceanography and Numerical Modeling Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China Guangxi Key Laboratory of Marine Environmental Change and Disaster in the Beibu Gulf Beibu Gulf UniversityQinzhou 535011China

Oxygen facilitates the breakdown of the organic material to provide energy for *** concentration of dissolved oxygen(DO) in the water must exceed a certain threshold to support the normal metabolism of marine *** in the northern B eibu Gulf,Qinzhou B ay receives abundant freshwater and nutrients from several rivers which significantly influence the level of the dissolved ***,the spatial-temporal variations of DO as well as the associated driving mechanisms have been rarely studied through field *** this study,a three-dimension al coupled physical-biogeochemical model is used to investigate the spatial and seasonal variations of the DO and the associated driving mechanisms in Qinzhou B *** validation against observations indicates that the model can capture the seasonal and inter-annual variability of the DO concentration with the range of 5-10 mg/*** experiments show that the river discharges,winds and tides play crucial roles in the seasonal variability of the DO by changing the vertical mixing and stratification of the water column and the circulation *** winter,the tide and wind forces have strong effects on the DO distribution by enhancing the vertical mixing,especially near the bay *** summer,the river discharges play a dominant role in the DO distribution by inhibiting the vertical water exchange and delivering more nutrients to the Bay,which increases the DO depletion and results in lower DO on the bottom of the estuary salt *** findings can contribute to the preservation and management of the coastal environment in the northern Beibu Gulf.

关键词： river plume dissolved oxygen stratification physical-biological model

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海洋中示踪物等值线的分形长度及其与混合效率的关系

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热带海洋学报 2024年第1期43卷 1-15页

作者：钱钰坤刘统亚张华彭世球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511458 中国科学院应用海洋重点实验室中国科学院南海海洋研究所广东广州511458 卫星海洋环境动力学国家重点实验室自然资源部第二海洋研究所浙江杭州310012 南方海洋科学与工程广东省实验室(珠海) 广东珠海519000 中国科学院大学北京100049

涡致混合扩散是物理海洋研究中的热点和难点问题。本文基于“有效扩散”理论,研究示踪物等值线在海表地转湍流的多尺度搅拌作用下,发生拉伸、扭曲、变形、折叠等改变其几何拓扑结构的现象,并探讨了等值线分形长度的变化与混合效率的关... 详细信息

涡致混合扩散是物理海洋研究中的热点和难点问题。本文基于“有效扩散”理论,研究示踪物等值线在海表地转湍流的多尺度搅拌作用下,发生拉伸、扭曲、变形、折叠等改变其几何拓扑结构的现象,并探讨了等值线分形长度的变化与混合效率的关系。研究结果表明,在地转流场的搅拌下,示踪物的等值线会被迅速拉长,并产生丰富的精细结构。这种分形式的增长可达原长度的10~20倍,是混合效率提高的主要原因;而涡丝和锋面伴随的梯度增强虽然也有贡献,但为次要因素。另一方面,在示踪物模拟过程中,小尺度扩散会通过不可逆混合对示踪物进行均匀化,从而抹平等值线的精细结构,抑制等值线的增长,限制混合效率的提高。基于“数盒子”算法计算了等值线的分形维度,其数值在1.4到1.6之间,介于一维和二维之间。但由于地转湍流数据分辨率的限制,无法考虑更小尺度(次中尺度过程)的搅拌作用,可能低估了等值线的分形长度和混合效率。本研究将海洋混合与等值线几何特征联系了起来,初步得到了分形长度和混合效率两者的经验关系式,未来可以利用图像识别等成熟遥感技术将海洋示踪物等值线的几何特征直接转换为混合效率,为诊断分析海洋混合及其参数化提供了一种新的思路。

关键词：海洋混合地转湍流分形几何有效扩散等值线

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Comparison between MM5 simulations and satellite measurements during Typhoon Chanchu (2006) in the South China Sea

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Acta Oceanologica Sinica 2012年第2期31卷 33-44页

作者： YANG Lei WANG Dongxiao peng shiqiu State Key Laboratory of Tropical Oceanography(LTO) the South China Sea Institute of OceanologyChinese Academy of ScienceGuangzhou 510301China

The fifth Pennsylvania State University and National Center for Atmospheric Research mesoscale model （MM5） is utilized to study the precipitation and wind speed during Typhoon Chanchu （2006）. Five model experiments with different physical parameterizations and sea surface temperature （SST） distributions are carried out. It is found that the control experiment configured with the Blakadar boundary scheme, Resiner2 moisture, the Betts-Miller cumulus scheme and daily updated SST has the most reasonable precipitation. The MRF boundary scheme tends to simulate a dryer boundary layer and stronger verticM mixing, which can greatly reduce the intensity of tropical cyclone （TC）, resulting in a smaller maximum wind speed but larger range of medium wind speed （25 30 m/s）. Constant SST through the TC cycle provides more energy from ocean surface, which could cause a significant increase in TC＇s intensity, thus resulting in the largest overestimation on rainfall and maximum wind speed. Longitudinally-uniform SST distribution before the rapid intensification could reduce TC＇s intensity and heat fluxes, which can partially compensate for the overestimation of precipitation in the control experiment.

关键词： mesoscale model 5, TRMM QuikSCAT precipitation wind speed

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On the heat budget and water mass exchange in the Andaman Sea

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Acta Oceanologica Sinica 2020年第7期39卷 32-41页

作者： Jiawen Liao shiqiu peng Xixi Wen State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China Institution of South China Sea Ecology and Environmental Engineering Chinese Academy of SciencesGuangzhou510301 China University of Chinese Academy of Sciences Beijing 100049China

The characteristics of the T/S structures,water mass exchange and deep circulation in the Andaman Sea are investigated based on the simulation from a high-resolution general circulation model(MITgcm).The results show that,below 1000 m,the water mass is saltier,warmer and more homogeneous in the Andaman Sea than that in the Bay of Bengal,attributing to the strong vertical mixing at the depth of^1800 *** water mass exchange between the Andaman Sea and the Bay of Bengal goes through three major channels,which manifests itself as follows:the northern channel(Preparis Channel)is the main passage of water mass transport from the Bay of Bengal to the Andaman Sea,whereas the Middle Channel(the south of Andaman Islands and the north of Nicobar Islands)has an opposite transport;the southern channel(Great Channel)features with a four-layer water exchange which results in the least net transport among the three channels;all the transports through the three channels have an intra-annual variation with a period of half a *** 1000-m depth,the entire Andaman Sea is occupied by a cyclonic circulation in January and July while by an anticyclonic one in April and *** semiannual cycle found in both the deep circulation and water mass exchange is likely associated with the downwelling eastward-propagating Kelvin waves induced by the semiannual westerly component in the equatorial Indian Ocean during intermonsoon seasons.

关键词： Andaman Sea heat budget water mass exchange deep water circulation

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Application of deep learning technique to the sea surface height prediction in the South China Sea

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Acta Oceanologica Sinica 2021年第7期40卷 68-76页

作者： Tao Song Ningsheng Han Yuhang Zhu Zhongwei Li Yineng Li Shaotian Li shiqiu peng College of Computer and Communication Engineering China University of Petroleum(East China)Qingdao 266580China State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China Key Laboratory of Science and Technology on Operational Oceanography Chinese Academy of SciencesGuangzhou 511458China Guangxi Key Laboratory of Marine Disaster in the Beibu Gulf Bubei Gulf UniversityQinzhou 535011China Department of Artificial Intelligence Faculty of Computer SciencePolytechnical University of MadridBoadilla del Monte 28660MadridSpain

A deep-learning-based method,called ConvLSTMP3,is developed to predict the sea surface heights(SSHs).ConvLSTMP3 is data-driven by treating the SSH prediction problem as the one of extracting the spatial-temporal features of SSHs,in which the spatial features are“learned”by convolutional operations while the temporal features are tracked by long short term memory(LSTM).Trained by a reanalysis dataset of the South China Sea(SCS),ConvLSTMP3 is applied to the SSH prediction in a region of the SCS east off Vietnam coast featured with eddied and offshore currents in *** results show that ConvLSTMP3 achieves a good prediction skill with a mean RMSE of 0.057 m and accuracy of 93.4%averaged over a 15-d prediction *** particular,ConvLSTMP3 shows a better performance in predicting the temporal evolution of mesoscale eddies in the region than a full-dynamics ocean *** the much less computation in the prediction required by ConvLSTMP3,our study suggests that the deep learning technique is very useful and effective in the SSH prediction,and could be an alternative way in the operational prediction for ocean environments in the future.

关键词： deep learning sea surface height prediction convolutional operation long short term memory

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Upper-Tropospheric Environment–Tropical Cyclone Interactions over the Western North Pacific:A Statistical Study

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Advances in Atmospheric Sciences 2016年第5期33卷 614-631页

作者： Yu-Kun QIAN Chang-Xia LIANG Zhuojian YUAN shiqiu peng Junjie WU Sihua WANG Center for Monsoon and Environmental Research/Department of Atmospheric Science Sun Yat-sen UniversityGuangzhou 510275 State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301 South China Sea Marine Prediction Center South Oceanic AdministrationGuangzhou 510300 Civil Aviation Flight University of China Guanghan 618307 Luogang District Meteorological Bureau Guangzhou 510530

Based on 25-year（1987–2011） tropical cyclone（TC） best track data, a statistical study was carried out to investigate the basic features of upper-tropospheric TC–environment interactions over the western North Pacific. Interaction was defined as the absolute value of eddy momentum flux convergence（EFC） exceeding 10 m s^（-1）d^（-1）. Based on this definition, it was found that 18% of all six-hourly TC samples experienced interaction. Extreme interaction cases showed that EFC can reach^120 m s^（-1）d^（-1） during the extratropical-cyclone（EC） stage, an order of magnitude larger than reported in previous *** analysis showed that positive interactions are characterized by a double-jet flow pattern, rather than the traditional trough pattern, because it is the jets that bring in large EFC from the upper-level environment to the TC center. The role of the outflow jet is also enhanced by relatively low inertial stability, as compared to the inflow jet. Among several environmental factors, it was found that extremely large EFC is usually accompanied by high inertial stability, low SST and strong vertical wind shear（VWS）. Thus, the positive effect of EFC is cancelled by their negative effects. Only those samples during the EC stage, whose intensities were less dependent on VWS and the underlying SST, could survive in extremely large EFC environments, or even re-intensify. For classical TCs（not in the EC stage）, it was found that environments with a moderate EFC value generally below ~25 m s^（-1）d^（-1） are more favorable for a TC＇s intensification than those with extremely large EFC.

关键词： Tropical cyclone–trough interaction upper troposphere eddy momentum flux convergence

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The early-warning effects of assimilation of the observations over the large-scale slope of the “World Roof” on its downstream weather forecasting

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Chinese Science Bulletin 2009年第4期54卷 706-710页

作者： peng shiqiu XU XiangDe SHI XiaoHui WANG DongXiao ZHU YuXiang PU JingJiao Department of Marine Earth & Atmospheric Sciences North Carolina State University Raleigh NC 27695-8208 USA State Key Laboratory of Severe Weather Chinese Academy of Meteorological Sciences Beijing 100081 China Key Laboratory of Tropical Marine Environmental Dynamics South China Sea Institute of Oceanology Chinese Academy of Sci- ences Guangzhou 510301 China Training Centre of China Meteorological Administration Beijing 100081 China Guangzhou Institute of Tropical and-Marine Meteorology China Meteorological Administration Guangzhou 510080 China Zhejiang Institute of Meteorological Sciences Hangzhou 310017 China

To improve the numerical simulation of the severe snow storms occurred in the south of China and the middle/lower reaches of Changjiang River during January of 2008, the observations from the automatic weather stations (AWS) over the Qinghai-Xizang Plateau (QXP) and its surrounding areas were assimi-lated into the Weather Research and Forecasts (WRF) model using multi-cycle 3-dimensional varia-tional data assimilation (3DVAR). Due to the large-scale special topography of the QXP and its sur-rounding areas which may reach up to the mid-troposphere, the AWS located at different height on the deep slope of the plateau are different to those located on plains and take a role analogous in some extent to that of radio soundings in obtaining the vertical "profile" information of the atmosphere, and have the advantages in the aspects of sampling frequency, location/height fixing, and synchronization. The information captured by these AWS may carry the early-warning "strong signals" in the upstream sensitive area for the downstream weather systems to the east of the plateau and thus the assimilation of these AWS data is expected to lead to significant improvements on the simulation of the severe weather system occurred in its downstream areas through adjusting the 3-dimensional structures of the atmospheric thermal-dynamics for the initial conditions of the model. This study indicates that the assimilated information of moisture, temperature and pressure carried in the observations of AWS over the Qinghai-Xizang Plateau and its surrounding areas is very important and useful in the forecasting of precipitation in its downstream areas.

关键词：雪暴数字模拟青海-西藏高原温度压力降水量

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MEMS微压压力传感器的灵敏度优化

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光学精密工程 2022年第13期30卷 1582-1590页

作者：彭时秋朱赛宁无锡中微晶园电子有限公司江苏无锡214000

为提高微机电系统微压压力传感器的灵敏度,根据硅压阻式压力传感器的工作原理介绍了影响压力传感器灵敏度的主要因素。使用COMSOL Mutilphysics有限元仿真软件开展压力敏感膜层厚度、压敏电阻摆放位置及压敏电阻长度对灵敏度影响规律的... 详细信息

为提高微机电系统微压压力传感器的灵敏度,根据硅压阻式压力传感器的工作原理介绍了影响压力传感器灵敏度的主要因素。使用COMSOL Mutilphysics有限元仿真软件开展压力敏感膜层厚度、压敏电阻摆放位置及压敏电阻长度对灵敏度影响规律的研究。根据仿真结果,减小压力敏感膜层厚度至15μm,设置压敏电阻长度为120μm,并将压敏电阻摆放至距压敏膜层边缘10μm的位置,完成了一款量程为40 kPa的MEMS硅压阻式微压压力传感器的结构优化,有效提升了传感器的灵敏度。测试结果表明,该压力传感器的灵敏度达到0.444 mV/kPa,相较于常规同量程灵敏度为0.35 mV/kPa的压力传感器,提升了26.8%。上述优化结果基本满足MEMS微压压力传感器的高灵敏度、高线性度等要求。

关键词：微机电系统微压压力传感器 COMSOL mutilphysics 灵敏度优化

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Advances in research of the mid-deep South China Sea circulation

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Science China Earth Sciences 2019年第12期62卷 1992-2004页

作者： Dongxiao WANG Qiang WANG Shuqun CAI Xiaodong SHANG shiqiu peng Yeqiang SHU Jingen XIAO Xiaohui XIE Zhiwei ZHANG Zhiqiang LIU Jian LAN Dake CHEN Huijie XUE Guihua WANG Jianping GAN Xinong XIE Rui ZHANG Hui CHEN Qingxuan YANG State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China School of Marine Science and Technology Tianjin UniversityTianjin 300072China State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMNRHangzhou 310012China Key Laboratory of Physical Oceanography MOEOcean University of ChinaQingdao 266003China Department of Ocean Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Institute of Atmospheric Sciences Fudan UniversityShanghai 200438China Department of Mathematics and Division of Environment Hong Kong University of Science and TechnologyHong Kong 999077China College of Marine Science and Technology China University of GeosciencesWuhan 430074China College of Oceanic and Earth Xiamen UniversityXiamen 361102China

The South China Sea(SCS)is a large marginal sea connecting the Indian and Pacific *** the factors of monsoons,strait transport,and varied bathymetry,the SCS presents a three-layer structure and strong diapycnal mixing which is far greater than that in the open *** analysis and observations reveal that internal tides,internal solitary waves,and strong winds are the sources of the strong mixing in the northern SCS.A major consequence of the strong mixing is an active mid-deep circulation *** system promotes exchange of water between the SCS and adjacent oceans,and also regulates the upper layer of wind-driven circulation,making the 3 dimensional SCS circulation clearly different from that in other tropical and subtropical marginal *** mass transport capacity of the mid-deep circulation has a substantial impact on marine sedimentation,the biogeochemical cycle,and other processes in the *** paper summarizes the recent advances in middeep sea circulation dynamics of the SCS,and discusses the opportunities and challenges in this area.

关键词： Mid-deep South China Sea circulation Diapycnal mixing Multi-scale processes interaction

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莫桑比克海峡及其邻近海区正压潮流数值模拟与能量收支分析

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热带海洋学报 2021年第2期40卷 7-16页

作者：张华温茜茜彭世球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实验室广东广州511458 中国科学院南海生态环境工程研究院广东广州510301 中国科学院大学北京100049

莫桑比克海峡及其邻近海区是全球海洋潮流和潮能耗散最强的海区之一。文章利用高分辨率通用环流模式对该海区的正压潮流进行模拟,并对该海区潮能通量和潮能耗散特征进行分析。结果表明,莫桑比克海峡及其邻近海区的潮波主要是半日分潮占... 详细信息

莫桑比克海峡及其邻近海区是全球海洋潮流和潮能耗散最强的海区之一。文章利用高分辨率通用环流模式对该海区的正压潮流进行模拟,并对该海区潮能通量和潮能耗散特征进行分析。结果表明,莫桑比克海峡及其邻近海区的潮波主要是半日分潮占主导地位,全日分潮可忽略不计,M_(2)分潮形成1个左旋潮波系统和1个右旋潮波系统,S_(2)分潮形成1个左旋潮波系统。莫桑比克海峡和马达加斯加岛南部等绝大数区域的M_(2)和S_(2)半日潮流是逆时针旋转,在马达加斯加岛顶部等局部区域是顺时针旋转,而且在海峡通道等复杂地形处潮流流速量级较大。潮能通量矢量主要来自东边界,大部分潮能通量沿马达加斯岛北部传入莫桑比克海峡区域,其中经过马达加斯加岛北部和进入莫桑比克海峡的M_(2)(S_(2))分潮的潮能通量分别为156.86GW(40.53GW)和148.07GW(36.05GW),S_(2)分潮潮能通量的量级大约为M_(2)分潮的1/5~1/4。底摩擦耗散主要发生莫桑比克海峡和马达加斯加岛南北部,其中莫桑比克海峡M_(2)(S_(2))分潮的底摩擦耗散为1.76_(2)GW(0.460GW),占其底部总耗散的43.74%(39.7_(2)%)。

关键词：莫桑比克海峡潮能通量潮能耗散数值模拟正压潮

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