本文選題：黑潮延伸體 + 海洋鋒　； 參考：《大氣科學(xué)》2017年06期

【摘要】：利用英國哈德萊中心(Hadley Center)1949~2014年表層海溫資料,將黑潮延伸體海區(qū)海溫經(jīng)向梯度的大值區(qū)域的平均值定義為黑潮延伸體及其北部海洋鋒強度指數(shù)(KEFI),利用數(shù)據(jù)分析方法研究了各季節(jié)KEFI的變化特征及其與北太平洋風暴軸的關(guān)系。分析表明,各季節(jié)的KEFI存在明顯的年際和年代際變化特征,同時在冬季與北太平洋瞬時方差有顯著正相關(guān),兩者在風暴軸主體位置的相關(guān)性最為顯著,并且這種相關(guān)性在KEFI超前一個月時就所顯現(xiàn),同時對后期風暴軸也有一定影響,即冬季黑潮延伸體海區(qū)海洋鋒的強度會影響風暴軸區(qū)域瞬時方差的變化。之后主要分析了這種影響的可能機制,發(fā)現(xiàn)在冬季KEFI高值年,由于海洋鋒兩側(cè)的熱量輸送差異更加明顯,導(dǎo)致海洋鋒附近的近表面氣溫經(jīng)向梯度增強,維持了近表面的斜壓性,促進渦動熱量的向極輸送和海洋鋒南側(cè)的向上輸送,有利于瞬時渦旋的發(fā)展。另外大尺度環(huán)流場與冬季黑潮延伸體海洋鋒也有關(guān)系,具體表現(xiàn)為,在海洋鋒強年,阿留申低壓加深,副熱帶高壓略有加強,對應(yīng)的對流層低層位勢高度場在40°N以北有負變高,以南有正變高,同時高空極鋒急流加強,副熱帶西風急流減弱加寬北抬,海洋鋒偏弱年的變化則相反。因此,冬季黑潮延伸體及其北部的海洋鋒主要通過兩側(cè)海表熱量輸送差異不斷產(chǎn)生氣溫梯度,進而維持斜壓性以促進上層風暴軸的發(fā)展。
[Abstract]:Using Hadley Center data of surface sea surface temperature (SST) from 1949 to 2014 in the Hadley Center, UK, In this paper, the mean value of the large area of sea surface temperature meridional gradient in the Kuroshio extensional area is defined as Kuroshio extensional body and its northern oceanic front intensity index (KEFI). The variation characteristics of KEFI in each season and its relationship with the North Pacific storm track are studied by using the data analysis method. The analysis shows that the KEFI of each season has obvious interannual and Interdecadal variation characteristics, and there is a significant positive correlation between the KEFI and the instantaneous variance of the North Pacific in winter, and the correlation between them is the most significant in the main position of storm track. Moreover, the correlation appears one month ahead of KEFI and has a certain effect on the later storm track, that is, the strength of the oceanic front in the Kuroshio extension area in winter will affect the variation of the instantaneous variance of the storm track region. After that, the possible mechanism of this influence is mainly analyzed. It is found that in the high value year of KEFI in winter, the difference of heat transfer between the two sides of the ocean front is more obvious, which leads to the enhancement of the meridional gradient of the near surface temperature near the ocean front, which maintains the baroclinic property of the near surface. It is beneficial to the development of instantaneous vortex to promote the polar transport of vortex heat and the upward transport of ocean front to the south. In addition, the large-scale circulation field is also related to the oceanic front of the Kuroshio extensional body in winter. In the strong year of the oceanic front, the Aleutian low pressure deepens, the subtropical high is slightly strengthened, and the corresponding lower tropospheric potential height field increases negatively to the north of 40 擄N. At the same time, the upper polar front jet is strengthened, the subtropical westerly jet is weakened and widened, and the oceanic front is weaker and weaker. Therefore, the winter Kuroshio extensional body and its northern oceanic front mainly produce temperature gradient through the difference of heat transport between the two sides of the sea surface, and then maintain baroclinic to promote the development of upper storm track.
【作者單位】： 中國氣象科學(xué)研究院;中國科學(xué)院大氣物理研究所大氣科學(xué)和地球流體力學(xué)數(shù)值模擬國家重點實驗室(LASG);
【基金】：國家自然科學(xué)基金項目41490642(41490640)、41665004~~
【分類號】：P731;P732

【相似文獻】

相關(guān)期刊論文 前3條

1 馬靜;徐海明;;春季黑潮延伸體海洋鋒區(qū)經(jīng)向位移與東亞大氣環(huán)流的關(guān)系[J];氣象科學(xué);2012年04期

2 謝傲;徐海明;徐蜜蜜;馬靜;;海表面盛行風背景下大氣對黑潮海洋鋒的響應(yīng)特征[J];氣象科學(xué);2014年04期

3 徐海明;王琳瑋;何金海;;衛(wèi)星資料揭示的春季黑潮海區(qū)海洋對大氣的影響及其機制研究[J];科學(xué)通報;2008年04期

相關(guān)碩士學(xué)位論文 前6條

1 張然;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[D];南京信息工程大學(xué);2015年

2 周琰;海洋鋒區(qū)海表風速最小值與氣壓調(diào)整機制[D];南京信息工程大學(xué);2016年

3 苑俐;黑潮延伸體海區(qū)海洋鋒與北太平洋風暴軸的關(guān)系及其氣候效應(yīng)[D];中國氣象科學(xué)研究院;2017年

4 謝傲;春季不同海表面盛行風向和風速背景下大氣對東海黑潮海洋鋒的響應(yīng)特征[D];南京信息工程大學(xué);2014年

5 劉敬武;東海黑潮區(qū)海洋鋒的區(qū)域氣候?qū)W效應(yīng)[D];中國海洋大學(xué);2010年

6 王琳瑋;春季黑潮海區(qū)海洋對大氣的影響及其可能機制[D];南京信息工程大學(xué);2008年

，

本文編號：1924150