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Dramatic weakening of the ear-shaped thermal front in the Yellow Sea during 1950s–1990s

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Acta Oceanologica Sinica 2017年第5期36卷 51-56页

作者： Tana FANG Yue LIU Baochao sun shuangwen WANG Huiwu College of Oceanic and Atmospheric Sciences Ocean University of China Center for Ocean and Climate Research The First Institute of OceanographyState Oceanic Administration Laboratory for Regional Oceanography and Numerical Modeling Qingdao National Laboratory for Marine Science and Technology

The ear-shaped thermal front （ESTF）, formed by the convergence of the Yellow Sea Warm Current （YSWC） and the Shandong Coastal Current （SCC）, is a very important oceanic phenomenon in the Yellow Sea （YS） in winter. In situ measurements and reanalysis datasets all demonstrate that the ESTF has been weakening during 1950s-1990s, and a similar weakening trend is also found in winter monsoon over the YS. Numerical experiments show that the weakening of winter monsoon can induce an anomalous circulation in the YS on multi-decadal timescale with northward anomalous currents along China＇s coast and southward anomalous currents in the central YS--generally opposite to seasonal mean circulation. The anomalous circulation causes slowdown of the YSWC and the SCC, and thus weakens the ESTF. Since the ESTF plays important roles in regional ocean dynamics and air-sea interactions, its weakening has important implications for regional climate in the YS in winter.

关键词： thermal front Yellow Sea circulation monsoon multi-decadal variability

Characteristics and triggering mechanisms of early negative Indian Ocean Dipole

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Acta Oceanologica Sinica 2024年第3期43卷 59-65页

作者： Yue Fang shuangwen sun Yongcan Zu Jianhu Wang Lin Feng First Institute of Oceanography and Key Laboratory of Marine Science and Numerical ModelingMinistry of Natural ResourcesQingdao 266061China Laboratory for Regional Oceanography and Numerical Modeling Qingdao Marine Science and Technology CenterQingdao 266237China Shandong Key Laboratory of Marine Science and Numerical Modeling Qingdao 266061China

Negative Indian Ocean Dipole(nIOD)can exert great impacts on global climate and can also strongly influence the climate in *** nIOD is a major type of nIOD,which can induce more pronounced climate anomalies in summer than La Niña-related ***,the characteristics and triggering mechanisms of early nIOD are *** results based on reanalysis datasets indicate that the early nIOD and La Niña-related nIOD are the two major types of nIOD,and the former accounts for over one third of all the nIOD events in the past six *** two types of nIODs are similar in their intensities,but are different in their spatial patterns and seasonal *** early nIOD,which develops in spring and peaks in summer,is one season earlier than the La Niña-related *** spatial pattern of the wind anomaly associated with early nIOD exhibits a winter monsoon-like pattern,with strong westerly anomalies in the equatorial Indian Ocean and eastly anomalies in the northern Indian *** to the triggering mechanism of early positve IOD,the early nIOD is induced by delayed Indian summer monsoon *** results of this study are helpful for improving the prediction skill of IOD and its climate impacts.

关键词： Indian Ocean Dipole(IOD) triggering mechanism Indian summer monsoon seasonal cycle negative IOD

Decadal variation of thermocline-sea surface temperature feedback in the tropical Indian Ocean and the underlying mechanisms

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Acta Oceanologica Sinica 2021年第11期40卷 31-38页

作者： Meiqi Zhang shuangwen sun Lin Liu Yongcan Zu Lin Feng First Institute of Oceanography and Key Laboratory of Marine Science and Numerical ModelingMinistry of Natural ResourcesQingdao 266061China Laboratory for Regional Oceanography and Numerical Modeling Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Shandong Key Laboratory of Marine Science and Numerical Modeling Qingdao 266061China

The thermocline-sea surface temperature(SST)feedback is the most important component of the Bjerknes feedback,which plays an important role in the development of the air-sea coupling modes of the Indian *** thermocline-SST feedback in the Indian Ocean has experienced significant decadal variations over the last40 *** feedback intensified in the late twentieth century and then weakened during the hiatus in global warming at the early twenty-first *** thermocline-SST feedback is most prominent in the southeastern and southwestern Indian *** the decadal variations of feedback are similar in these two regions,there are still differences in the underlying *** decadal variations of feedback in the southeastern Indian Ocean are dominated by variations in the depth of the thermocline,which are modulated by equatorial zonal wind *** the decadal variation of feedback in the southwestern Indian Ocean is mainly controlled by the intensity of upwelling and thermocline depth in winter and spring,*** upwelling and thermocline depth are both affected by wind stress curl anomalies over the southeastern Indian Ocean,which excite anomalous Ekman pumping and influence the southwestern Indian Ocean through westward propagating Rossby waves.

关键词： Indian Ocean thermocline-SST feedback decadal variation upwelling thermocline depth

Seasonal variation of mesoscale eddy intensity in the global ocean

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Acta Oceanologica Sinica 2024年第1期43卷 48-58页

作者： Yongcan Zu Yue Fang shuangwen sun Libao Gao Yang Yang Guijun Guo First Institute of Oceanography/Key Laboratory of Marine Science and Numerical Modeling Ministry of Natural ResourcesQingdao 266061China Laboratory for Regional Oceanography and Numerical Modeling Laoshan LaboratoryQingdao 266237China Shandong Key Laboratory of Marine Science and Numerical Modeling Qingdao 266061China

Mesoscale eddies are a prominent oceanic phenomenon that plays an important role in oceanic mass transport and energy *** by rotational speed,the eddy intensity is one of the most fundamental properties of an ***,the seasonal spatiotemporal variation in eddy intensity has not been examined from a global ocean *** this study,we unveil the seasonal spatiotemporal characteristics of eddy intensity in the global ocean by using the latest satellite-altimetry-derived eddy trajectory data *** results suggest that the eddy intensity has a distinct seasonal variation,reaching a peak in spring while attaining a minimum in autumn in the Northern Hemisphere and the opposite in the Southern *** seasonal variation of eddy intensity is more intense in the tropical-subtropical transition zones within latitudinal bands between 15°and 30°in the western Pacific Ocean,the northwestern Atlantic Ocean,and the eastern Indian Ocean because baroclinic instability in these areas changes *** analysis found that the seasonal variation of baroclinic instability precedes the eddy intensity by a phase of 2–3 months due to the initial perturbations needing time to grow into mesoscale eddies.

关键词： seasonal variation mesoscale eddy intensity baroclinic instability global ocean

Variations of SST and Thermocline Depth in the Tropical Indian Ocean During Indian Ocean Dipole Events

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Journal of Ocean University of China 2010年第2期9卷 129-134页

作者： sun shuangwen LAN Jian WANG Yi Physical Oceanography Laboratory Ocean University of China Qingdao 266100 P. R. China

Interannual variations in the surface and subsurface tropical Indian Ocean were studied using HadlSST and SODA datasets. Wind and heat flux datasets were used to discuss the mechanisms for these variations. Our results indicate that the surface and subsurface variations of the tropical Indian Ocean during Indian Ocean Dipole （IOD） events are significantly different. A prominent characteristic of the eastern pole is the SSTA rebound after a cooling process, which does not take place at the subsurface layer. In the western pole, the surface anomalies last longer than the subsurface anomalies. The subsurface anomalies are strongly correlated with ENSO, while the relationship between the surface anomalies and ENSO is much weaker. And the subsurface anomalies of the two poles are negatively correlated while they are positively correlated at the surface layer. The wind and surface heat flux analysis suggests that the thermocline depth variations are mainly determined by wind stress fields, while the heat flux effect is important on SST.

关键词： Indian Ocean Dipole ENSO thermocline depth SST

Seasonal characteristics and formation mechanism of the thermohaline structure of mesoscale eddy in the South China Sea

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Acta Oceanologica Sinica 2019年第4期38卷 29-38页

作者： Yongcan Zu shuangwen sun Wei Zhao Peiliang Li Baochao Liu Yue Fang Azizan Abu Samah College of Oceanic and Atmospheric Sciences Ocean University of China Center for Ocean and Climate Research First Institute of OceanographyMinistry of Natural Resources Laboratory for Regional Oceanography and Numerical Modeling Pilot National Laboratory for Marine Science and Technology (Qingdao) Ocean College Zhejiang University Institute of Ocean and Earth Sciences University of Malaya

The seasonal characteristics and formation mechanism of the thermohaline structure of mesoscale eddy in the South China Sea are investigated using the latest eddy dataset and ARMOR3D data. Eddy-centric composites reveal that the horizontal distribution of temperature anomaly associated with eddy in winter is more of a dipole pattern in upper 50 m and tends to be centrosymmetric below 50 m, while in summer the distribution pattern is centrosymmetric in the entire water column. The horizontal distribution of eddy-induced salinity anomaly exhibits similar seasonal characteristics, except that the asymmetry of the salinity anomaly is weaker. The vertical distribution of temperature anomaly associated with eddy shows a monolayer structure, while the salinity anomaly demonstrates a triple-layer structure. Further analysis indicates that the vertical distribution of the anomalies is related to the vertical structure of background temperature and salinity fields, and the asymmetry of the anomalies in upper 50 m is mainly caused by the horizontal advection of background temperature and salinity.

关键词： mesoscale eddy thermohaline structure seasonal characteristics South China Sea

The Distribution and Variability of Simulated Chlorophyll Concentration over the Tropical Indian Ocean from Five CMIP5 Models

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Journal of Ocean University of China 2013年第2期12卷 253-259页

作者： LIU Lin FENG Lin YU Weidong WANG Huiwu LIU Yanliang sun shuangwen Center for Ocean and Climate Research First Institute of OceanographyState Oceanic Administration

Performances of 5 models from the Coupled Model Intercomparison Project Phase 5 (CMIP5) in simulating the chloro-phyll concentration over the tropical Indian Ocean are evaluated. Results show that these models are able to capture the dominant spatial distribution of observed chlorophyll concentration and reproduce the maximum chlorophyll concentration over the western part of the Arabian Sea, around the tip of the Indian subcontinent, and in the southeast tropical Indian Ocean. The seasonal evolution of chlorophyll concentration over these regions is also reproduced with significant amplitude diversity among models. All of 5 mod-els is able to simulate the interannual variability of chlorophyll concentration. The maximum interannual variation occurs at the same regions where the maximum climatological chlorophyll concentration is located. Further analysis also reveals that the Indian Ocean Dipole events have great impact on chlorophyll concentration in the tropical Indian Ocean. In the general successful simulation of chlorophyll concentration, most of the CMIP5 models present higher than normal chlorophyll concentration in the eastern equatorial Indian Ocean.

关键词： Indian Ocean chlorophyll concentration climatology seasonal variability interannual variability

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东海冷涡中心位置及季节性变化的初步研究

地球科学进展 2010年第2期25卷 184-192页

作者：王刚兰健孙双文中国海洋大学海洋学系山东青岛266100

使用1958—2001年SODA温度场资料,较为系统地对东海冷涡附近海域具代表性剖面温度场进行逐月分析,对冷涡中心提取方法进行了总结完善。结果表明,35 m深处冷涡44年的平均中心位于(32.0°N,125.7°E);冷涡的中心位置存在较显著的季节性变... 详细信息

使用1958—2001年SODA温度场资料,较为系统地对东海冷涡附近海域具代表性剖面温度场进行逐月分析,对冷涡中心提取方法进行了总结完善。结果表明,35 m深处冷涡44年的平均中心位于(32.0°N,125.7°E);冷涡的中心位置存在较显著的季节性变化:经向变化方面,由夏季、秋季至冬季,冷涡中心位置自北向南逐渐移动;从冬季、春季至夏季自南向北移动。纬向变化方面,冬季冷涡中心明显偏西,其他季节冷涡中心偏东且中心经度变化不大。以上变化主要是由冷涡周边流场的季节性变化引起的。冷涡中心在冬末春初和秋初表现不明显,这应是由环流场季节性转换导致。

关键词：东海冷涡季节性变化

An erosional hiatus in Chinese loess sequences revealed by closely spaced optical dating

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Chinese Science Bulletin 2006年第18期51卷 2253-2259页

作者： LU Huayu Thomas Stevens YI shuangwen sun Xuefeng Institute of Earth Environment SKLLQG-CAS Xi'an 710075 China Faculty of Geography and Ocean Sciences Nanjing University Nanjing 210093 China Centre for the Environment University of Oxford South Parks Road Oxford OX1 3QY UK

Chinese loess deposits are some of the best continental records of palaeoclimatic and pa- laeoenvironmental changes in the late Cenozoic. Many investigations have shown that the long-time climate variations recorded by the loess-paleosol sequences can be correlated with global environ- mental changes. However,there are still some foundational questions concerning loess deposition that are not well answered,casting uncertainty on many previous conclusions,especially high-resolu- tion palaeoclimatic records. In this study,three typical loess-paleosol sections spanning the last glacial cy- cle were closely sampled for optically stimulated lu- minescence (OSL) dating and palaeoclimate inter- pretation along a northwest-southeast transect in Chinese Loess Plateau. Results show that there is a 4-5 ka hiatus in the typical loess deposits,and as a consequence suggests that the loess record is not continuous over millennial time scales. As such,pre- vious conclusions on climatic and environmental changes at millennial-centennial time scale,recon- structed through the loess record,should be reinves- tigated. The erosional hiatus may be forced by a pe- riod with strengthened East Asian winter monsoon and the less vegetation cover in the investigated sites.

关键词：黄土高原侵蚀间断 OSL定年古气候变化