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海洋热浪背景下海气湍流热通量资料的评估——以2019年东北太平洋“Blob 2.0”事件为例

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海洋预报 2024年第3期41卷 1-11页

作者：马婧宋翔洲闫运伟王斌陈陟河海大学海洋学院江苏南京210024 自然资源部国家海洋技术中心天津300112 国家海洋环境预报中心北京100081

2019年夏季,东北太平洋地区经历了一次名为“Blob 2.0”的海洋热浪事件,对海洋生态系统造成了严重影响。利用美国国家数据浮标中心的浮标观测资料、全球客观分析通量产品OAFlux,以及大气再分析数据集ERA5、NCEP2和MERRA-2,综合分析了“B... 详细信息

2019年夏季,东北太平洋地区经历了一次名为“Blob 2.0”的海洋热浪事件,对海洋生态系统造成了严重影响。利用美国国家数据浮标中心的浮标观测资料、全球客观分析通量产品OAFlux,以及大气再分析数据集ERA5、NCEP2和MERRA-2,综合分析了“Blob 2.0”事件期间海气湍流热通量的特征,并研究了其物理因素。浮标观测显示,在“Blob 2.0”事件期间,潜热通量呈现正增长趋势,而感热通量呈现负增长趋势,这一现象可归因于海气比湿度差呈正增长,而风速和海气温差呈负增长。评估结果表明:4种通量数据产品都低估了潜热通量的增长,ERA5的增长率与浮标最为接近。对于感热通量,MERRA-2和NCEP2产品的增长趋势与浮标观测相同,其中MERRA-2的增长率更接近;而OAFlux和ERA5产品的增长趋势与观测相反。

关键词：海洋热浪湍流热通量异常浮标观测通量数据集

Winter coastal upwelling off northwest Borneo in the South China Sea

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Acta Oceanologica Sinica 2015年第1期34卷 3-10页

作者： yan yunwei LING Zheng CHEN Changlin College of Physical and Environmental Oceanography Ocean University of China State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyState Oceanic Administration

Winter coastal upwelling off northwest Borneo in the South China Sea （SCS） is investigated by using satellite data, climatological temperature and salinity fields and reanalysis data. The upwelling forms in Decem- ber, matures in January, starts to decay in February and almost disappears in March. Both Ekman trans- port induced by the alongshore winter monsoon and Ekman pumping due to orographic wind stress curl are favorable for the upwelling. Transport estimates demonstrate that the month-to-month variability of Ekman transport and Ekman pumping are both consistent with that of winter coastal upwelling, but Ek- man transport is two times larger than Ekman pumping in January and February. Under the influence of E1 Nino-Southern Oscillation （ENSO）, the upwelling shows remarkable interannual variability： during winter of El Nino （La Nina） years, an anticyclonic （a cyclonic） wind anomaly is established in the SCS, which behaves a northeasterly （southwesterly） anomaly and a positive （negative） wind stress curl anomaly off the north- west Borneo coast, enhancing （reducing） the upwelling and causing anomalous surface cooling （warming） and higher （lower） chlorophyll concentration. The sea surface temperature anomaly （SSTA） associated with ENSO off the northwest Borneo coast has an opposite phase to that off southeast Vietnam, resulting in a SSTA seesaw pattern in the southern SCS in winter.

关键词： coastal upwelling northwest Borneo South China Sea Ekman transport Ekman pumping,interannual variability

Warm water wake off northeast Vietnam in the South China Sea

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Acta Oceanologica Sinica 2014年第11期33卷 55-63页

作者： yan yunwei CHEN Changlin LING Zheng College of Physical and Environmental Oceanography Ocean University of China State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyState Oceanic Administration

Due to orographic blockage, a weak wind wake occurs in summer off northeast Vietnam in the South China Sea. Under the wind wake, warm water is observed from both high-resolution satellite data and hydrographic observations. The wake of warm water forms in June, continues to mature in July and August, starts to decay in September, and disappears in October. The warm water wake also shows robust diurnal variation – it intensifies during the day and weakens in the night. Warm water wakes can be generated through wind-induced mixing and thermal（latent heat flux） processes. In this paper, a mixed layer model is used to evaluate the relative importance of the two processes on seasonal and diurnal timescales, respectively. The results demonstrate that thermal processes make a greater contribution to the wake than wind-induced mixing processes on a seasonal timescale, while the warm water wake is dominated by wind-induced mixing processes on a diurnal timescale.

关键词： warm water wake wind-induced mixing processes thermal processes seasonal timescale diurnal timescale northeast Vietnam South China Sea

Influence of two inlets of the Luzon overflow on the deep circulation in the northern South China Sea

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Acta Oceanologica Sinica 2020年第11期39卷 13-20页

作者： Muping Zhou Changlin Chen yunwei yan Wenhu Liu College of Ocean and Earth Science Xiamen UniversityXiamen 361102China Department of Atmospheric and Oceanic Sciences&Institute of Atmospheric Sciences Fudan UniversityShanghai 200438China State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519000China

An inverse reduced-gravity model is used to simulate the deep South China Sea(SCS)circulation.A set of experiments are conducted using this model to study the influence of the Luzon overflow through the two inlets on the deep circulation in the northern *** results suggest that the relative contribution of these inlets largely depends on the magnitude of the input transport of the overflow,but the northern inlet is more efficient than the southern inlet in driving the deep circulation in the northern *** all of the Luzon overflow occurs through the northern inlet the deep circulation in the northern SCS is ***,when all of the Luzon overflow occurs through the southern inlet the circulation in the northern SCS is weakened.A Lagrangian trajectory model is also developed and applied to these *** Lagrangian results indicate that the location of the Luzon overflow likely has impacts upon the sediment transport into the northern SCS.

关键词： inlets Luzon overflow deep circulation northern South China Sea

SST diurnal warming in the China seas and northwestern Pacific Ocean using MTSAT satellite observations

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Acta Oceanologica Sinica 2016年第12期35卷 12-18页

作者： TU Qianguang PAN Delu HAO Zengzhou yan yunwei State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyState Oceanic Administration Department of Earth Science Zhejiang University College of Geomatics and Municipal Engineering Zhejiang University of Water Resources and Electric Power

Hourly sea surface temperature(SST) observations from the geostationary satellite are increasingly used in studies of the diurnal warming of the surface oceans. The aim of this study is to derive the spatial and temporal distribution of diurnal warming in the China seas and northwestern Pacific Ocean from Multi-functional Transport Satellite(MTSAT) SST. The MTSAT SST is validated against drifting buoy measurements firstly. It shows mean biases is about –0.2°C and standard deviation is about 0.6°C comparable to other satellite SST accuracy. The results show that the tropics, mid-latitudes controlled by subtropical high and marginal seas are frequently affected by large diurnal warming. The Kuroshio and its extension regions are smaller compared with the surrounding regions. A clear seasonal signal, peaking at spring and summer can be seen from the long time series of diurnal warming in the domain in average. It may due to large insolation and low wind speed in spring and summer, while the winter being the opposite. Surface wind speed modulates the amplitude of the diurnal cycle by influencing the surface heat flux and by determining the momentum flux. For the shallow marginal seas, such as the East China Sea, turbidity would be another important factor promoting diurnal warming. It suggests the need for the diurnal variation to be considered in SST measurement, air-sea flux estimation and multiple sensors SST blending.

关键词： diurnal warming sea surface temperature remote sensing MTSAT

Interannual variability of thermal front west of Luzon Island in boreal winter

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Acta Oceanologica Sinica 2015年第11期34卷 102-108页

作者： SUN Ruili LING Zheng CHEN Changlin yan yunwei College of Physical and Environmental Oceanography Ocean University of China State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyState Oceanic Administration

Interannual variability of thermal front west of Luzon Island during the winter of 1993-2013 is examined with the method of singular value decomposition （SVD） and a suite of satellite measurements in this paper. It is found that both the area and intensity of the thermal front west of Luzon Island show apparent interannual variability. Further study based on SVD shows that the interannual variability of the thermal front is highly associated with E1 Nifio and Southern Oscillation （ENSO）, and the correlation coefficient between Nifio3.4 index and the first Principal Component （PC1） of thermal front can reach -0.65. The mechanism can be described as follows. In E1 Nifio （La Nifia） years, the East Asian winter monsoon （EAWM） is weakened （enhanced）, inducing weaker （stronger） local wind stress curl （WSC） west of Luzon Island, and resulting in weakened （enhanced） Luzon cold eddy, which finally leads to the weakening （enhancement） of the thermal front.

关键词： thermal front interannual variability Luzon Island ENSO South China Sea

Role of ocean upper layer warm water in the rapid intensification of tropical cyclones: A case study of typhoon Rammasun(1409)

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Acta Oceanologica Sinica 2016年第3期35卷 63-68页

作者： SUN Jia ZUO Juncheng LING Zheng yan yunwei Key Laboratory of Coastal Disaster and Defence of Ministry of Education Hohai University Institute of Physical Oceanography Hohai University State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyState Oceanic Administration

Rammasun intensified rapidly from tropical storm to super typhoon in the northern South China Sea（NSCS）before its landfall on Hainan Island. Analysis of observed data shows that the anomalous ocean upper layer warm water（WW） is important to the rapid intensification of Rammasun. During the period of Rammasun, sea surface temperature（SST） in the NSCS was much warmer than the climatological SST. The anomalous WW supplied more energy to Rammasun, resulting in its rapid intensification. Numerical simulations further confirm that the NSCS WW plays an important role in the rapid intensification of Rammasun. As the WW is removed, the intensification of Rammasun is only 25 h Pa, which is 58.1% of that in the original SST-forced run.

关键词： tropical cyclone Rammasun rapid intensification warm water sea surface temperature

Numerical investigation of the control factors driving Zhe-Min Coastal Current

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Acta Oceanologica Sinica 2022年第2期41卷 127-138页

作者： yang Zhang Fei Chai Joseph Zhang yang Ding Min Bao yunwei yan Hong Li Wei Yu Liang Chang State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519080China School of Marine Sciences University of MaineOronoME 04469USA Virginia Institute of Marine Science College of William&Mary Center for Coastal Resource ManagementWilliamsburgVA 23185USA Physical Oceanography Laboratory Ocean University of ChinaQingdao 266100China Department of Atmospheric and Oceanic Sciences Institute of Atmospheric SciencesFudan UniversityShanghai 200438China College of Marine Sciences Shanghai Ocean UniversityShanghai 201306China

During the northeast monsoon season,Zhe-Min Coastal Current(ZMCC)travels along the Chinese mainland coast and carries fresh,cold,and eutrophic *** is significantly important for the hydrodynamic processes and marine ecosystems along its ***,this bottom-trapped plume deserves to be further discussed in terms of the major driving factor,for which different opinions *** this purpose,in this study,a high resolution Semi-implicit Cross-scale Hydroscience Integrated System Model(SCHISM)is established and *** correlation coefficients exist between along-shelf wind speeds and seasonal variations of both ZMCC volume transport and the freshwater *** coefficients imply that the wind is important in regulating ***,for similar annual mean ZMCC volume transports,the extreme south boundaries of Zhe-Min Coastal Water(ZMCW)are different among different *** difference is attracting attention and is explored in this *** to the low wind/discharge experiment,it was found that although the volume transport of ZMCC is more sensitive to the variation of local wind speeds,the carried freshwater is limited by the Changjiang River discharge,which ultimately determines the south boundary of *** momentum analysis at transects I and II shows that,for driving ZMCC,the along-shore wind forcing is as important as the buoyancy *** that this conclusion is supported by a zero-discharge *** was also found that the buoyancy forcing varies with respect to time and space,which is due to variations of the discharge of Changjiang *** addition,a particle tracking experiment shows that the substance carried by the Changjiang River diluted water would distribute along the Zhe-Min coastal region during the northeast monsoon season and it may escape due to the wind relaxation.

关键词： coastal current numerical model momentum analysis Changjiang River diluted water East China Sea

基于Argo实测流场数据对5套海洋模式产品中赤道太平洋中层流的评估

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海洋学研究 2020年第3期38卷 1-9页

作者：周永远闫运伟邢小罡柴扉卫星海洋环境动力学国家重点实验室浙江杭州310012 自然资源部第二海洋研究所浙江杭州310012 美国缅因大学海洋科学学院缅因州欧洛诺市04469

本文以Argo轨迹资料计算的赤道太平洋中层流(1 000 m深度流场)作为实测数据,从空间结构特征和时间变化特征两方面对5套常用海洋模式产品(OFES、LICOM、HYCOM、ECCO2和SODA)进行了评估。Argo流场显示赤道太平洋中层流呈条带状结构,且存... 详细信息

本文以Argo轨迹资料计算的赤道太平洋中层流(1 000 m深度流场)作为实测数据,从空间结构特征和时间变化特征两方面对5套常用海洋模式产品(OFES、LICOM、HYCOM、ECCO2和SODA)进行了评估。Argo流场显示赤道太平洋中层流呈条带状结构,且存在明显的西强东弱和南强北弱特征。此外,赤道太平洋中层流存在明显的季节变化且其相位关于赤道对称。5套模式产品的评估结果表明,SODA流场与实测流场最接近,其时空变化特征都与实测流场基本一致;其次是ECCO2流场,除流场动能偏小以外,其他各方面都与实测流场一致;OFES、LICOM和HYCOM流场的模拟效果较差,但都能再现条带状结构特征。

关键词：赤道太平洋中层流场 Argo轨迹模式评估