黑潮與黑潮延伸體海表面溫度鋒區(qū)的季節(jié)變化特征及其成因
發(fā)布時(shí)間：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資料、美國(guó)氣候預(yù)測(cè)再分析資料(CFSR)中的海氣界面熱通量資料、美國(guó)國(guó)家海洋和大氣管理局/國(guó)家氣候數(shù)據(jù)中心(NOAA/NCDC)提供的逐日海表面10米矢量風(fēng)資料,以及美國(guó)國(guó)家地球物理數(shù)據(jù)中心(NGDC)提供的海洋水深資料(GEBCO),分析了東中國(guó)海、日本以東黑潮及黑潮延伸體海表面溫度鋒區(qū)的季節(jié)變化特征及其成因,得到以下結(jié)論：(1)東海黑潮海洋鋒與日本以東黑潮及黑潮延伸體海洋鋒均存在季節(jié)變化,但各自的強(qiáng)度最值出現(xiàn)時(shí)間有所不同。東海黑潮海洋鋒在春季達(dá)到最強(qiáng),秋季最弱,而日本以東黑潮及黑潮延伸體海洋鋒在冬季1～2月最強(qiáng),夏末秋初最弱。黑潮延伸體海洋鋒強(qiáng)度極值出現(xiàn)的時(shí)間均略晚于黑潮海洋鋒。動(dòng)力因素(海溫平流、溫度垂直輸送)和熱力因素(海氣界面凈熱通量)共同影響東海黑潮海洋鋒、日本黑潮及黑潮延伸體海洋鋒強(qiáng)度的季節(jié)變化,其中海溫水平平流和凈熱通量對(duì)海洋鋒的季節(jié)變化起主要作用,溫度垂直輸送對(duì)海洋鋒的影響相對(duì)較小。(2)通過診斷混合層熱流量方程發(fā)現(xiàn),海溫水平平流導(dǎo)致鋒區(qū)兩側(cè)溫度梯度增大,全年促進(jìn)海洋鋒的形成和增強(qiáng),是導(dǎo)致東海、日本以東海洋鋒分別在春季、冬季1～2月最強(qiáng)的主要原因。海氣界面凈熱通量對(duì)東海和日本以東黑潮、黑潮延伸體海洋鋒的作用不盡相同。在東中國(guó)海,凈熱通量在秋冬季對(duì)海洋鋒的形成有促進(jìn)作用,有利于海洋鋒增強(qiáng),而在春夏季則起抑制作用,促進(jìn)海洋鋒消亡。在日本以東的黑潮及黑潮延伸體流域,凈熱通量項(xiàng)主要促進(jìn)海洋鋒消亡且該抑制作用在夏季最強(qiáng),在其他季節(jié),凈熱通量項(xiàng)對(duì)海洋鋒的影響相對(duì)較小,但在不同海洋鋒區(qū)對(duì)混合層海溫變化的影響不同。溫度垂直輸送對(duì)東海及日本以東的海洋鋒影響均相對(duì)較小,但其在東海主要起抑制作用,而對(duì)日本以東不同海域的影響并不完全相同。總之,在海溫水平平流和海表凈熱通量的共同作用下導(dǎo)致東海黑潮海洋鋒春季達(dá)到最強(qiáng),夏、秋季海表凈熱通量和溫度垂直輸送的共同作用致使東海海洋鋒減弱并最后消失,而在日本以東黑潮及黑潮延伸體海洋鋒區(qū),海溫水平平流對(duì)海洋鋒1-2月最強(qiáng)起到主導(dǎo)作用,凈熱通量則是導(dǎo)致海洋鋒在夏末秋初減弱消失的主要原因。
[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.
【學(xué)位授予單位】：南京信息工程大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P732.6;P731.27
本文編號(hào)：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.
【學(xué)位授予單位】：南京信息工程大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P732.6;P731.27
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，本文編號(hào)：2198204
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