黑潮与黑潮延伸体海表面温度锋区的季节变化特征及其成因
发布时间：2018-08-22 20:27
【摘要】：本文利用日本FRA-JCOPE2高分辨率海洋模式同化资料、美国气候预测再分析资料(CFSR)中的海气界面热通量资料、美国国家海洋和大气管理局/国家气候数据中心(NOAA/NCDC)提供的逐日海表面10米矢量风资料,以及美国国家地球物理数据中心(NGDC)提供的海洋水深资料(GEBCO),分析了东中国海、日本以东黑潮及黑潮延伸体海表面温度锋区的季节变化特征及其成因,得到以下结论：(1)东海黑潮海洋锋与日本以东黑潮及黑潮延伸体海洋锋均存在季节变化,但各自的强度最值出现时间有所不同。东海黑潮海洋锋在春季达到最强,秋季最弱,而日本以东黑潮及黑潮延伸体海洋锋在冬季1～2月最强,夏末秋初最弱。黑潮延伸体海洋锋强度极值出现的时间均略晚于黑潮海洋锋。动力因素(海温平流、温度垂直输送)和热力因素(海气界面净热通量)共同影响东海黑潮海洋锋、日本黑潮及黑潮延伸体海洋锋强度的季节变化,其中海温水平平流和净热通量对海洋锋的季节变化起主要作用,温度垂直输送对海洋锋的影响相对较小。(2)通过诊断混合层热流量方程发现,海温水平平流导致锋区两侧温度梯度增大,全年促进海洋锋的形成和增强,是导致东海、日本以东海洋锋分别在春季、冬季1～2月最强的主要原因。海气界面净热通量对东海和日本以东黑潮、黑潮延伸体海洋锋的作用不尽相同。在东中国海,净热通量在秋冬季对海洋锋的形成有促进作用,有利于海洋锋增强,而在春夏季则起抑制作用,促进海洋锋消亡。在日本以东的黑潮及黑潮延伸体流域,净热通量项主要促进海洋锋消亡且该抑制作用在夏季最强,在其他季节,净热通量项对海洋锋的影响相对较小,但在不同海洋锋区对混合层海温变化的影响不同。温度垂直输送对东海及日本以东的海洋锋影响均相对较小,但其在东海主要起抑制作用,而对日本以东不同海域的影响并不完全相同。总之,在海温水平平流和海表净热通量的共同作用下导致东海黑潮海洋锋春季达到最强,夏、秋季海表净热通量和温度垂直输送的共同作用致使东海海洋锋减弱并最后消失,而在日本以东黑潮及黑潮延伸体海洋锋区,海温水平平流对海洋锋1-2月最强起到主导作用,净热通量则是导致海洋锋在夏末秋初减弱消失的主要原因。
[Abstract]:In this paper, we use the assimilation data of FRA-JCOPE2 high-resolution ocean model in Japan and the heat flux data of the air-sea interface in the (CFSR) data of the United States climate prediction reanalysis data. The NOAA/NCDC / National Climate data Center (NOAA/NCDC) and the National Geophysical data Center (NGDC) have analyzed the East China Sea by using the 10-meter vector wind data provided by the National Oceanic and Atmospheric Administration / National Climate data Center (NOAA/NCDC) and the ocean bathymetric data provided by the National Geophysical data Center (NGDC). The seasonal variation of the sea surface temperature front of the Kuroshio and the Kuroshio extensional body in Japan and its causes are discussed. The following conclusions are obtained: (1) the Kuroshio oceanic front in the East China Sea and the Kuroshio and Kuroshio extensional oceanic front in the east of Japan have seasonal variations. However, the maximum value of each intensity appears at different times. The Kuroshio oceanic front in the East China Sea reached the strongest in spring and the weakest in autumn, while the east Kuroshio and Kuroshio extensional body in Japan were the strongest in January and February in winter, and the weakest in late summer and early autumn. The intensity extremum of the oceanic front of the Kuroshio extensional body appears slightly later than that of the Kuroshio oceanic front. Dynamic factors (sea surface temperature advection, vertical temperature transport) and thermal factors (net heat flux at the air-sea interface) affect the seasonal variation of the strength of the Kuroshio front, the Japanese Kuroshio and the Kuroshio extensional body in the East China Sea. The horizontal advection of sea surface temperature and net heat flux play a major role in the seasonal variation of ocean front, and the vertical transport of temperature has relatively little effect on the sea front. (2) through the diagnosis of mixing layer heat flux equation, it is found that, The horizontal advection of SST results in the increase of the temperature gradient on both sides of the frontal zone, and promotes the formation and enhancement of the oceanic front throughout the year, which is the main cause of the East China Sea and the East Japan Sea front in spring and January to February in winter respectively. The effect of net heat flux on the Kuroshio in the East China Sea and east of Japan is different. In the East China Sea, the net heat flux can promote the formation of ocean front in autumn and winter, which is beneficial to the enhancement of ocean front, while it plays an inhibitory role in spring and summer, and promotes the extinction of ocean front. In the Kuroshio and Kuroshio extensional basins east of Japan, the net heat flux term mainly promotes the extinction of the oceanic front and the inhibition effect is strongest in summer. In other seasons, the influence of the net heat flux term on the oceanic front is relatively small. However, the influence of sea front on the variation of mixed layer SST is different. The vertical temperature transport has a relatively small effect on the sea front in the East China Sea and east of Japan, but it mainly inhibits the sea front in the East China Sea, but the influence on the different sea areas east of Japan is not exactly the same. In a word, the combined action of horizontal advection of sea temperature and net heat flux of sea surface leads to the strongest spring of Kuroshio ocean front in the East China Sea, and the combined action of surface net heat flux and vertical transport of temperature in summer and autumn makes the sea front of the East China Sea weaken and finally disappear. In the sea front of the Kuroshio and Kuroshio extensional body east of Japan, the horizontal advection of sea surface temperature plays a dominant role in January and February, and the net heat flux is the main reason for the weakening and disappearing of the sea front in late summer and early autumn.
【学位授予单位】：南京信息工程大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P732.6;P731.27
本文编号：2198204
[Abstract]:In this paper, we use the assimilation data of FRA-JCOPE2 high-resolution ocean model in Japan and the heat flux data of the air-sea interface in the (CFSR) data of the United States climate prediction reanalysis data. The NOAA/NCDC / National Climate data Center (NOAA/NCDC) and the National Geophysical data Center (NGDC) have analyzed the East China Sea by using the 10-meter vector wind data provided by the National Oceanic and Atmospheric Administration / National Climate data Center (NOAA/NCDC) and the ocean bathymetric data provided by the National Geophysical data Center (NGDC). The seasonal variation of the sea surface temperature front of the Kuroshio and the Kuroshio extensional body in Japan and its causes are discussed. The following conclusions are obtained: (1) the Kuroshio oceanic front in the East China Sea and the Kuroshio and Kuroshio extensional oceanic front in the east of Japan have seasonal variations. However, the maximum value of each intensity appears at different times. The Kuroshio oceanic front in the East China Sea reached the strongest in spring and the weakest in autumn, while the east Kuroshio and Kuroshio extensional body in Japan were the strongest in January and February in winter, and the weakest in late summer and early autumn. The intensity extremum of the oceanic front of the Kuroshio extensional body appears slightly later than that of the Kuroshio oceanic front. Dynamic factors (sea surface temperature advection, vertical temperature transport) and thermal factors (net heat flux at the air-sea interface) affect the seasonal variation of the strength of the Kuroshio front, the Japanese Kuroshio and the Kuroshio extensional body in the East China Sea. The horizontal advection of sea surface temperature and net heat flux play a major role in the seasonal variation of ocean front, and the vertical transport of temperature has relatively little effect on the sea front. (2) through the diagnosis of mixing layer heat flux equation, it is found that, The horizontal advection of SST results in the increase of the temperature gradient on both sides of the frontal zone, and promotes the formation and enhancement of the oceanic front throughout the year, which is the main cause of the East China Sea and the East Japan Sea front in spring and January to February in winter respectively. The effect of net heat flux on the Kuroshio in the East China Sea and east of Japan is different. In the East China Sea, the net heat flux can promote the formation of ocean front in autumn and winter, which is beneficial to the enhancement of ocean front, while it plays an inhibitory role in spring and summer, and promotes the extinction of ocean front. In the Kuroshio and Kuroshio extensional basins east of Japan, the net heat flux term mainly promotes the extinction of the oceanic front and the inhibition effect is strongest in summer. In other seasons, the influence of the net heat flux term on the oceanic front is relatively small. However, the influence of sea front on the variation of mixed layer SST is different. The vertical temperature transport has a relatively small effect on the sea front in the East China Sea and east of Japan, but it mainly inhibits the sea front in the East China Sea, but the influence on the different sea areas east of Japan is not exactly the same. In a word, the combined action of horizontal advection of sea temperature and net heat flux of sea surface leads to the strongest spring of Kuroshio ocean front in the East China Sea, and the combined action of surface net heat flux and vertical transport of temperature in summer and autumn makes the sea front of the East China Sea weaken and finally disappear. In the sea front of the Kuroshio and Kuroshio extensional body east of Japan, the horizontal advection of sea surface temperature plays a dominant role in January and February, and the net heat flux is the main reason for the weakening and disappearing of the sea front in late summer and early autumn.
【学位授予单位】：南京信息工程大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P732.6;P731.27
【参考文献】
相关期刊论文 前4条
1 赵永平;张必成;井立才;;冬季东海黑潮海-气热量交换对长江中下游汛期降水的影响[J];海洋与湖沼;1983年03期
2 康建成;王国栋;朱炯;孙闻政;刘超;李燕;;东海黑潮区温度的月际变化特征[J];海洋与湖沼;2012年05期
3 张天宇;孙照渤;李忠贤;王栋钰;;春季黑潮区海温异常与我国夏季降水的关系[J];热带气象学报;2007年02期
4 马静;徐海明;;春季黑潮延伸体海洋锋区经向位移与东亚大气环流的关系[J];气象科学;2012年04期
相关硕士学位论文 前1条
1 刘敬武;东海黑潮区海洋锋的区域气候学效应[D];中国海洋大学;2010年
，本文编号：2198204
本文链接：https://www.wllwen.com/kejilunwen/haiyang/2198204.html
