本文關(guān)鍵詞：冬季熱帶印度洋上層流場異常模態(tài)分析　出處：《氣候與環(huán)境研究》2017年04期 　論文類型：期刊論文

  更多相關(guān)文章： 熱帶印度洋 流場異常 復(fù)經(jīng)驗(yàn)正交函數(shù)(CEOF)分解 南亞冬季風(fēng)

【摘要】：利用復(fù)經(jīng)驗(yàn)正交函數(shù)(CEOF)分解對冬季熱帶印度洋海洋上層流場異常做了模態(tài)分析和結(jié)果討論,得到以下主要結(jié)果:該流場異常前兩個(gè)模態(tài)均呈現(xiàn)赤道俘獲波形式,其異常在赤道上最大,向南北兩側(cè)迅速衰減,呈現(xiàn)緯向流的形態(tài);第一、二模態(tài)的性質(zhì)分別是大洋赤道波動(dòng)的半波和1波形態(tài),這表明此時(shí)赤道波動(dòng)異常在大洋流場異常中占有重要地位。冬季第一模態(tài)大洋垂直運(yùn)動(dòng)所導(dǎo)致的近表層海溫異常與春、秋季不同,此時(shí)在赤道印度洋呈現(xiàn)正—負(fù)—正的經(jīng)向分布態(tài)勢,這與印度洋耦極子(Indian Ocean Dipole,IOD)的不同,并是IOD在冬季衰亡的直接原因。第二模態(tài)相應(yīng)的海溫異常則在赤道東印度洋呈現(xiàn)北負(fù)南正的分布態(tài)勢。第一模態(tài)與南亞冬季風(fēng)異常密切有關(guān),為印度洋冬季風(fēng)環(huán)流模態(tài)。第一、二模態(tài)都有明顯的年際變化和年代際變化,年際變化均為3~5年,主要的年代際變化則分別為約18、22年,此外兩者還均有約13年的年代際變化。本文第一、二模態(tài)年代際變化的主周期也是冬季北太平洋和冬季熱帶太平洋流場異常第二、一模態(tài)的主周期。
[Abstract]:By using the complex empirical orthogonal function (CEOF) decomposition of winter tropical India ocean upper ocean flow anomalies do modal analysis and discussion of the results, the main results are as follows: the flow field anomaly before two modes showed the equatorial trapped waves, the largest anomalies in the equatorial south, North on both sides of the rapid decay of zonal flow patterns, showing the first, second mode is respectively; the nature of ocean equatorial waves of half wave and 1 wave form, which indicates that the abnormal fluctuations in the equatorial ocean flow anomaly plays an important role. In the first winter SST mode vertical motion caused by ocean anomalies and spring, autumn, this time at the equator in India ocean is positive - negative - positive meridional distribution situation, and the India Ocean dipole (Indian Ocean, Dipole, IOD) is different, and is IOD in the direct cause of decay in winter. The second modes of the corresponding SST anomalies in the equatorial eastern India The present distribution of North South are negative trend. The winter monsoon and South Asia anomaly is closely related to the first mode, India ocean winter monsoon circulation mode. The first, second mode has obvious interannual and interdecadal variation, interannual variation was 3~5 years, interdecadal changes mainly were respectively about 18,22 years, in addition to decadal variation there were about 13 years. The main period of the main cycle in the first, second mode the interdecadal variation of the North Pacific in winter and winter and tropical Pacific flow abnormalities in second, first modes.

【作者單位】： 中國科學(xué)院大氣物理研究所;中國人民解放軍61741部隊(duì);
【基金】：國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(973計(jì)劃)2013CB956203~~
【分類號】：P732
【正文快照】： 浩瀚的印度洋僅次于太平洋是世界第二大洋,位于我國的西南方,印度洋上空的大氣狀態(tài)及印度洋大洋狀態(tài)對我國天氣和氣候有明顯影響,特別是對我國西南地區(qū)(彭京備,2012;徐志清和范可,2014)。熱帶印度洋位于亞洲季風(fēng)區(qū),受南亞季風(fēng)的控制,而南亞季風(fēng)對我國的西南地區(qū)也有顯著影響(

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相關(guān)期刊論文 前10條

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本文編號：1373372