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12篇 您的检索式:作者名="Pohlmann Thomas"
    题名 作者 年代 出处 被引量
1渤海环流与输运季节变化的数值模拟(英文)显示文摘渤海的风和温度层结有明显的季节变化 ,因而其环流与输运亦有明显的季节信号。以季节平均的海面气象条件和开边界的潮波系统驱动三维斜压水动力模型———HAMSOM ,模拟了渤海冬、夏季的总环流。渤海环流冬强夏弱 ,表层风漂流常被下层逆风流所补偿。深度平均环流 ,即水柱内的输运 ,流型有显著的季节变化 :冬季在渤海中部沿逆时针方向旋转 ,辽东湾顶有一个顺时针流涡 ,阻碍了湾顶水与外海水的交换 ;夏季则为一个大的贴岸的顺时针流环 ,内嵌许多局地涡旋。这些与渤黄东海海洋水文图集中给出的多年观测的环流基本相同 ,同时也被水文要素分布及耐盐浮游动物的出现所佐证。风的季节变化决定了渤海大部分海区、特别是海峡附近环流的季节变化 ,但辽东湾东岸众多的岬角涡旋却不随季节变化 ,因为它们是由潮波系统与岬角岸型变化的非线性相互作用产生的。魏皓 武建平 POHLMANN Thomas 2001黄渤海海洋2001,19,2:26
2A novel high resolution model without open boundary conditions applied to the China Seas: first investigation on tides显示文摘We developed a Global Ocean Circulation and Tide Model (GOCTM) with coarse grids in the open deep ocean degrading ‘smoothly’ into the highly resolved China Seas (CS) of refined grids to study the tides and circulation there.GOCTM is based on the framework of the Finite Volume approach for better mass conservation through improved transports across the discrete individual control volume.It also takes a full advantage of the geometric flexibility of unstructured mesh using a realistic global topography including the Arctic Ocean.The CS are given a special focus by refining the unstructured grids,but they are embedded into global domain naturally.Furthermore,GOCTM not only successfully avoids the treatment of the open boundaries,but also optimizes the trade-off between computational cost and model accuracy.Meanwhile,GOCTM is driven by the astronomical tide-generating potential and the secondary tide-generating potential directly,together with the wind stress and heat flux.GOCTM succeeds in reproducing the global eight principal tidal harmonic constants.Particularly,the simulated tidal results in the CS are improved compared to some other regional models with the discrepancy of 3.9 cm for M 2 tide.This idea of GOCTM can also be referred for other regional ocean study.YU Huaming CHEN Xueen BAO Xianwen Thomas Pohlmann WU Dexing 2010Acta Oceanologica Sinica2010,29,6:5
3Assimilation of surface currents into a regional model over Qingdao coastal waters of China显示文摘雷达穿的高频率(HF ) 测量的表面水流基于 Kalman 过滤器方法在 Qingdao 沿海的水上被吸收进一个地区性的海洋模型。一系列数字实验被执行评估数据吸收计划的性能。以便在传统的整体 Kalman 过滤器(ENKF ) 优化分析过程,一个不同分析计划把 quasiensemble 称为 Kaman 过滤器(QENKF ) 被建议。在 ENKF 和 QENKF 之间的比较两个都建议那他们能改进模仿的错误和空间结构。背景错误协变性(BEC ) 的评价被比较三个不同方法也估计:蒙特卡罗方法;加拿大的快协变性(CQC ) 方法和数据无常引擎(到期) 方法。在模型结果和 CQC 方法能更好为这沿海的海洋复制错误统计的观察表演之间的错误建模的 root-mean-square (RMS ) 的重要减小并且相应外部强迫。另外,到整体尺寸的数据吸收系统的敏感也借助于在实验使用的整体尺寸的不同规模被分析。它被发现那给计算费用和预报精确性的平衡, 50 的整体尺寸将是 Qingdao 沿海的水里的一种适当选择。ZHAO Jian CHEN Xueen XU Jiangling HU Wei CHEN Jinrui Pohlmann Thomas 2013Acta Oceanologica Sinica2013,32,7:2
4原始热通量资料的海陆分布对近海SST模拟的影响显示文摘对于海洋数值模式用以计算海表温度(SST)的热通量资料,本文在插值的过程中引入了1个权重因子f,以探讨由于原始资料和数值模式的分辨率以及相应的海陆分布的不同所导致的近海SST模拟误差。对于原始资料中坐标位于海洋的点,f_O=1.0;而对于坐标位于陆地的点,f_L~[0,1]。数值实验对比了渤海和北黄海的原始数据插值结果和SST模拟结果。通过对比数值模式和原始资料的海陆分布,发现在模拟海区有相当多的模式水点被原始资料的陆点半围绕,在这些点上的插值结果受f_L的取值影响较大。本文的对比数值实验表明,当f_L分别取0.5和1.0时,对SST的模拟差异在部分海域达到了O(0.1℃)的量级,与数值模式本身的误差量级相当,是海洋数值研究中应当给予重视的误差因素。宋丹 Thomas Pohlmann 陈学恩 2010中国海洋大学学报(自然科学版)2010,40,7:2
5Simulation and detection of tsunami signatures in ocean surface currents measured by HF radar显示文摘Klaus-Werner Gurgel Anna Dzvonkovskaya Thomas Pohlmann Thomas Schlick Eric Gill 2011Ocean Dynamics2011,,10:1
6Calculation of water exchange times in the ICES-boxes with a eulerian dispersion model using a half-life time approach显示文摘Roger Luff Thomas Pohlmann 1995Deutsche Hydrographische Zeitschrift1995,,4:1
7A modelling study of SPM transport in the Bohai Sea显示文摘Jiang Wensheng Thomas Pohlmann Jürgen Sündermann 2000Journal of Marine Systems2000,24,:1
8SPM transport in the Bohai Sea:field experiments and numerical modelling显示文摘Jiang Wensheng Thomas Pohlmann Jun Sun 2004Journal of Marine Systems2004,44,:1
9SPM transport in the Bohai Sea: field experiments and numerical modelling显示文摘Wensheng Jiang Thomas Pohlmann Jun Sun Andreas Starke 2003Journal of Marine Systems2003,,3:1
10Genotoxicity testing of sulfur dioxide (SO 2 ) in a mouse bone marrow micronucleus test complemented with hematological endpoints显示文摘Christina Ziemann Tanja Hansen Gerhard Pohlmann David Farrar Christina Pohlenz-Michel Thomas Tillmann Inge Mangelsdorf 2010MutRes-Genetic Toxicology and Environmental Mutagenesis2010,,1:1
11The influence of the Three-Gorges Dam on hydrographic and hydrodynamic conditions of the East China Sea显示文摘A fine resolution model has been applied to get more insight into the effects of a modified runoff due to the Three-Gorges-Dam (TGD) on the East China Sea (ECS).The region of interest was confined to the offshore area in the vicinity of the Changjiang River.To the east,it extended up to the area southwest of Cheju Island.The model was used to evaluate the effect of a modified runoff on the water properties of the adjacent regions like the Changjiang diluted water (CDW) and the Zhoushan Fishing Ground.The sensitivity of the ECS to a modified Changjiang runoff was explored firstly by sensitivity studies and secondly by experiments based on historical runoff records and water management plans of the TGD.These experiments led to the general conclusion that the most affected area by runoff is located close to the Changjiang River mouth.The area of influence has an extension of about 150 km×150 km.In the realistic experiment,the related anomalies reached their maximum value in early summer (May).In normal years the related salinity anomalies can get to as large as 2.FAN Xiaopeng ZHOU Feng CHEN Xueen HUANG Daji POHLMANN Thomas 2011Acta Oceanologica Sinica2011,30,5:0
12Organophosphate Esters in Air and Seawater of the South China Sea:Spatial Distribution,Transport,and Air−Sea Exchange显示文摘Organophosphate esters(OPEs)have become one group of chemicals with emerging concern in the marine environment.In this work,we investigated OPEs in the air and seawater of the South China Sea in summer 2019.The concentrations of∑_(10)OPEs in the atmosphere ranged from 66 to 550 pg/m^(3),with TCIPP,TNBP,TPhP,and TEP predominating in the air.The total dissolved OPE concentrations(∑_(10)OPEs without TEP)measured in high-volume water samples ranged from 300 to 3600 pg/L,with a mean concentration of 1180±910 pg/L.TEP was measured with liquid−liquid extraction(LLE),and it showed the highest concentration(average 2000±1450 pg/L)among the selected OPEs.Total suspended matter associated OPEs accounted for less than 4.7%of the sum of OPE concentrations in seawater.Fugacity fractions and air−sea exchange fluxes showed that TCEP,TCIPP,TIBP,TEHP,TPhP,and EHDPP were favored to volatilize,TEP dominated the deposition,while TPrP and TNBP varied between volatilization and deposition.Atmospheric particle deposition fluxes ranged from 5 to 71 ng/m^(2)/day with an average of 17±15 ng/m^(2)/day.The input of∑OPEs to the entire South China Sea via atmospheric particle deposition was estimated to be 22±19 tons/year,while the net air−sea exchange fluxes of OPEs were volatilization from seawater to air with an average of 44±33 tons/year.This work suggests that air−sea exchange and atmospheric particle deposition are significant processes interfering with the transport of OPEs in the marine environment.Lijie Mi Zhiyong Xie Lulu Zhang Joanna J.Waniek Thomas Pohlmann Wenying Mi Weihai Xu 2023Environment & Health2023,1,3:0
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