南海涡动能比季节变化特征及机理分析
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摘要
基于1993-2012年Aviso海面高度异常资料识别中尺度涡,计算南海海域涡动能比,并结合涡旋移动轨迹对气旋涡、反气旋涡的时空分布特征进行分析。结果表明,涡动能比能直观刻画区域涡旋活跃程度,结合涡旋移动轨迹后能有效反映涡旋演变过程。冬季季风期,南海中尺度涡最为活跃,反气旋涡、气旋涡交错分布在南海东部。台湾岛西南反气旋涡大多向西北方向移动,少数在气旋涡作用下向西南方向移动。越南东部涡旋呈偶极子分布,夏秋季北部是气旋涡,南部是反气旋涡,冬季北部是反气旋涡,南部是气旋涡。
The lower-bound estimates on the percentage of eddy kinetic energy(LEP) are made from merged altimetric data from 1993 to 2012.We investigate the spatiotemporal variability of eddies based on LEP.The result shows that the LEP can be used to estimate the active value of mesoscale eddies in SCS and investigate the spatiotemporal variability of eddies with the movement path.Typically,anticyclonic eddies and cyclonic eddies are generated shoulder to shoulder along the east coast of the SCS during the East Asian winter monsoon.Most of the anticyclonic eddies appearing in the southwest of Taiwan Island prefer to propagate northwest,but minority of them propagate southwest in the cause of cyclonic eddies in the eastern part.The eddies located off central Vietnam have a dipole structure,which is constituted by an anticyclonic eddy in the southern part and a cyclonic eddy in the north during the winter monsoon,while a cyclonic eddy in the southern part and an anticyclonic eddy in the north in summer and autumn.
The lower-bound estimates on the percentage of eddy kinetic energy(LEP) are made from merged altimetric data from 1993 to 2012.We investigate the spatiotemporal variability of eddies based on LEP.The result shows that the LEP can be used to estimate the active value of mesoscale eddies in SCS and investigate the spatiotemporal variability of eddies with the movement path.Typically,anticyclonic eddies and cyclonic eddies are generated shoulder to shoulder along the east coast of the SCS during the East Asian winter monsoon.Most of the anticyclonic eddies appearing in the southwest of Taiwan Island prefer to propagate northwest,but minority of them propagate southwest in the cause of cyclonic eddies in the eastern part.The eddies located off central Vietnam have a dipole structure,which is constituted by an anticyclonic eddy in the southern part and a cyclonic eddy in the north during the winter monsoon,while a cyclonic eddy in the southern part and an anticyclonic eddy in the north in summer and autumn.
引文
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Chen G X,Hou Y J,Chu X Q,2011.Mesoscale eddies in the South Chin Sea:Mean properties,spatiotemporal variability,and impact on thermohaline structure,Journal Of Geophysical Research,116(C06018):102-108.
Chen G X,Hou Y J,Chu X Q,et al,2009.The variability of eddy kineti energy in the South China Sea deduced from satellite altimeter data Chinese Journal of Oceanology and Limnology,27(4):943-954.
Cheng X H,Qi Y Q,2010.Variations of Eddy Kinetic Energy in the South China Sea,Chinese Journal of Oceanology and Limnology,66:85-94.
He Y H,Cai S Q,Wang D X,et al,2015.A model study of Luzon cold eddies in the northern South China Sea,Deep-Sea Research Part I97:107-123.
Liu Y,Dong C M,Guan Y P,Chen D,et al,2012.Eddy analysis in th subtropical zonal band of the North Pacific Ocean.Deep-Se Research,68:54-67.
Metzget E J,Harley E H,2001.The importance of high horizontal resolution and accurate coastline geometry in modeling South China Seainflow.Geophysical Research Letters,28(6):1 059-1 062.
Nencioli F,Dong C M,Dickey T,et al,2012.A vector geometry-based eddy detection algorithm and its application to a high-resolution numerical model product and high-frequency radar surface velocities in the Southern California Bight,Journal of Atmospheric and Oceanic Technology,27:564-579.
Wang G H,Su J L,Chu P C,2003.Mesoscale eddies in the South China Sea observed with altimeter data.Geophysical Research Letters,30(21):2127.
蔡树群,苏纪兰,1995.南海环流的一个两层模式.海洋学报,17(2):12-20.
管秉贤,袁耀初,2006.中国近海及其附近海域若干涡旋研究综述--南海和台湾以东海域.海洋学报,28(3):1-15.
林鹏飞,王凡,陈永利,等,2007.南海中尺度涡的时空变化规律I.统计特征分析.海洋学报,29(3):14-22.
王东晓,陈举,陈荣裕,等,2004.2000年8月南海中部与南部海洋温、盐与环流特征.海洋与湖沼,35(2):97-109.
王桂华,2004.南海中尺度涡的运动规律探讨.青岛:中国海洋大学,30-42.
王桂华,苏纪兰,齐义泉,2005.南海中尺度涡研究进展.地球科学进展,20(8):882-886.
王璐华,张韧,李佳讯,等,2014.吕宋海峡海面涡度场与地转流场的特征分布.海洋通报,33(3):241-249.
Chelton D B,M G Schlax,R M Samelson,2011.Global observation o nonlinear mesoscale eddies,Progress in Oceanography,91:167-216.
Chelton D B,Michael G S,Roger M S,et al,2007.Global observations o large oceanic eddies,Journal Of Geophysical Research,3(L15606):87-101.
Chen G X,Hou Y J,Chu X Q,2011.Mesoscale eddies in the South Chin Sea:Mean properties,spatiotemporal variability,and impact on thermohaline structure,Journal Of Geophysical Research,116(C06018):102-108.
Chen G X,Hou Y J,Chu X Q,et al,2009.The variability of eddy kineti energy in the South China Sea deduced from satellite altimeter data Chinese Journal of Oceanology and Limnology,27(4):943-954.
Cheng X H,Qi Y Q,2010.Variations of Eddy Kinetic Energy in the South China Sea,Chinese Journal of Oceanology and Limnology,66:85-94.
He Y H,Cai S Q,Wang D X,et al,2015.A model study of Luzon cold eddies in the northern South China Sea,Deep-Sea Research Part I97:107-123.
Liu Y,Dong C M,Guan Y P,Chen D,et al,2012.Eddy analysis in th subtropical zonal band of the North Pacific Ocean.Deep-Se Research,68:54-67.
Metzget E J,Harley E H,2001.The importance of high horizontal resolution and accurate coastline geometry in modeling South China Seainflow.Geophysical Research Letters,28(6):1 059-1 062.
Nencioli F,Dong C M,Dickey T,et al,2012.A vector geometry-based eddy detection algorithm and its application to a high-resolution numerical model product and high-frequency radar surface velocities in the Southern California Bight,Journal of Atmospheric and Oceanic Technology,27:564-579.
Wang G H,Su J L,Chu P C,2003.Mesoscale eddies in the South China Sea observed with altimeter data.Geophysical Research Letters,30(21):2127.
蔡树群,苏纪兰,1995.南海环流的一个两层模式.海洋学报,17(2):12-20.
管秉贤,袁耀初,2006.中国近海及其附近海域若干涡旋研究综述--南海和台湾以东海域.海洋学报,28(3):1-15.
林鹏飞,王凡,陈永利,等,2007.南海中尺度涡的时空变化规律I.统计特征分析.海洋学报,29(3):14-22.
王东晓,陈举,陈荣裕,等,2004.2000年8月南海中部与南部海洋温、盐与环流特征.海洋与湖沼,35(2):97-109.
王桂华,2004.南海中尺度涡的运动规律探讨.青岛:中国海洋大学,30-42.
王桂华,苏纪兰,齐义泉,2005.南海中尺度涡研究进展.地球科学进展,20(8):882-886.
王璐华,张韧,李佳讯,等,2014.吕宋海峡海面涡度场与地转流场的特征分布.海洋通报,33(3):241-249.