天堂国产午夜亚洲专区-少妇人妻综合久久蜜臀-国产成人户外露出视频在线-国产91传媒一区二区三区

當(dāng)前位置:主頁(yè) > 科技論文 > 海洋學(xué)論文 >

兩類(lèi)厄爾尼諾對(duì)次年夏季中國(guó)東部降水的可能影響

發(fā)布時(shí)間:2018-04-20 00:03

  本文選題:東部型厄爾尼諾 + 中部型厄爾尼諾; 參考:《中國(guó)氣象科學(xué)研究院》2014年碩士論文


【摘要】:增暖中心位于赤道東部太平洋和赤道中部太平洋的厄爾尼諾事件分別稱(chēng)為東部型和中部型厄爾尼諾,研究其衰亡年夏季中國(guó)東部降水分布的差異有很重要的意義。因此,本文首先根據(jù)東部型ENSO和中部型ENSO熱帶太平洋海溫分布特點(diǎn),構(gòu)建了兩個(gè)用于區(qū)別這兩類(lèi)ENSO事件的新指數(shù);其次從大尺度波動(dòng)能量傳播以及西太平洋副熱帶高壓角度利用新指數(shù)研究?jī)深?lèi)厄爾尼諾次年夏季東亞環(huán)流與中國(guó)降水的異常;最后利用模式模擬前期兩類(lèi)厄爾尼諾對(duì)次年夏季中國(guó)環(huán)流與降水的影響,以此補(bǔ)充和驗(yàn)證之前的診斷分析工作。研究工作分為以下三個(gè)部分: 一.采用聯(lián)合回歸—EOF方法得到東部型ENSO和中部型ENSO的熱帶太平洋海溫分布特點(diǎn),進(jìn)而定義了計(jì)算相對(duì)簡(jiǎn)單的東部型ENSO指數(shù)(IEP)和中部型ENSO指數(shù)(ICP)來(lái)分別描述兩類(lèi)ENSO。研究結(jié)果如下:首先,構(gòu)建的ICP和IEP的相關(guān)性很小,接近正交,而且IEP和ICP能夠反映兩類(lèi)ENSO不一致的偏度和周期,因此,這對(duì)指數(shù)能夠清楚地區(qū)分兩類(lèi)ENSO。其次,IEP和ICP這兩個(gè)指數(shù)可以描述厄爾尼諾和拉尼娜事件成熟期主要海表溫度異常區(qū)的位置。再次,應(yīng)用IEP和ICP從隨機(jī)事件概率統(tǒng)計(jì)的角度給出兩類(lèi)厄爾尼諾和拉尼娜事件較為嚴(yán)格的定義,以便實(shí)時(shí)有效地監(jiān)測(cè)兩類(lèi)ENSO。最后,利用新指數(shù)對(duì)兩類(lèi)ENSO的特征進(jìn)行研究發(fā)現(xiàn),強(qiáng)厄爾尼諾事件一般屬于東部型,而強(qiáng)拉尼娜事件則為中部型,并且中部型拉尼娜事件發(fā)生的前期是東部型厄爾尼諾,另外,ENSO的發(fā)生演變機(jī)制在1976/1977年左右發(fā)生了改變。 二.重點(diǎn)分析中部型厄爾尼諾和東部型厄爾尼諾事件的海溫演變特征及其對(duì)應(yīng)的熱帶大氣響應(yīng)情況,并進(jìn)一步探討了這兩類(lèi)厄爾尼諾對(duì)次年夏季中國(guó)降水的可能影響。結(jié)果表明:首先,兩類(lèi)厄爾尼諾事件海溫演變表現(xiàn)出較為明顯的差異,,對(duì)應(yīng)的熱帶太平洋上空的沃克環(huán)流異常也表現(xiàn)出明顯的不同。其次,東部型厄爾尼諾次年6、7月北半球中高緯度呈現(xiàn)OKJ型波列(鄂霍次克!毡緰|部—日期變更線(xiàn)以西副熱帶高壓北部的波列)明顯,鄂霍次克海異常高壓阻礙梅雨鋒和西北太平洋副熱帶高壓北移,西北太平洋副熱帶高壓明顯偏南、偏西,大量水汽輸送到長(zhǎng)江以南地區(qū),江南降水偏多;而中部型厄爾尼諾次年6、7月鄂霍次克海是異常低壓,6月西北太平洋副熱帶高壓偏東,大量水汽輸送到華南,中國(guó)長(zhǎng)江以南地區(qū)的降水無(wú)明顯異常,7月西北太平洋副熱帶高壓偏北,大量水汽輸送到華北。最后,兩類(lèi)冷暖事件對(duì)次年梅雨期中國(guó)江南降水的影響均為非對(duì)稱(chēng)的,東部型暖事件對(duì)其是顯著的正貢獻(xiàn),即次年梅雨期長(zhǎng)江以南降水的增加主要體現(xiàn)在暖事件上;而中部型冷暖事件對(duì)此范圍降水的影響均較弱。 三.使用NCAR CAM3.0模式,設(shè)計(jì)多組不同海溫異常的敏感性試驗(yàn),討論次年夏季中國(guó)長(zhǎng)江以南地區(qū)降水對(duì)前期兩類(lèi)厄爾尼諾的響應(yīng)。分析模擬結(jié)果如下:首先,模式中分別加入兩類(lèi)厄爾尼諾從發(fā)展年9月到衰亡年8月實(shí)測(cè)的海溫異常,此結(jié)果能夠很好地再現(xiàn)兩類(lèi)厄爾尼諾次年夏季東亞環(huán)流與中國(guó)南方降水的差異,證實(shí)了前期診斷分析的結(jié)論。其次,使5月的海溫異常持續(xù)到6、7、8月,此試驗(yàn)的模擬結(jié)果與觀(guān)測(cè)的較為相似,再一次證明前期兩類(lèi)厄爾尼諾事件對(duì)東亞環(huán)流和中國(guó)降水的滯后影響。最后,改變加入模式的海溫異常強(qiáng)度,發(fā)現(xiàn)對(duì)東部型厄爾尼諾來(lái)說(shuō),隨著海溫異常強(qiáng)迫的增強(qiáng),次年6、7月長(zhǎng)江以南降水會(huì)近似地增加,而且當(dāng)海溫異常足夠強(qiáng)時(shí),長(zhǎng)江以南的降水為正距平且其范圍與實(shí)際情況接近;而對(duì)中部型厄爾尼諾來(lái)說(shuō),海溫異常強(qiáng)度與次年夏季各月中國(guó)長(zhǎng)江以南降水之間沒(méi)有穩(wěn)定的關(guān)系。
[Abstract]:The El Nio events , which are located in the Pacific and Central Pacific of the eastern equatorial Pacific and Central Pacific , are called Eastern and Central El Nio , respectively . It is very important to study the difference of precipitation distribution in the eastern part of China in summer .
Secondly , from the large scale wave energy propagation and the western Pacific subtropical high pressure angle , we use the new index to study the anomalies of the East Asian circulation and China ' s precipitation in the next summer of El Nio .
Finally , the effects of two kinds of El Nio on China ' s circulation and precipitation in summer of the next summer are simulated by using the model simulation , so as to supplement and verify the previous diagnosis and analysis work . The research is divided into three parts :

I . In this paper , the characteristics of the tropical Pacific ocean temperature distribution in the east and the central type are obtained by using the combination of the combination of the regression method and the method . The results are as follows : Firstly , the correlation between the ICP and IEP is very small and close to the orthogonality , and the IEP and ICP can reflect the two types of events of El Nio and La Nina events .

II . The effects of these two kinds of El Nio events on China ' s precipitation in the next summer are analyzed . The results show that the two types of El Nino events show distinct differences in SST evolution , and the Walker circulation anomalies over the corresponding tropical Pacific show distinct differences .
At last , two kinds of cold and warm events are asymmetric in the south of the Yangtze River . In the end , there are two types of cold and warm events which are asymmetric in the south of the Yangtze River in July , and the east type warm events are significant positive contribution to the precipitation in the second year of the Meiyu period , that is , the increase of the precipitation in the south of the Yangtze River in the second year is mainly reflected in the warm events ;
The effect of the central cold and warm events on the precipitation in this range is weak .

III . The results are as follows : First , two kinds of El Nino events in the south of the Yangtze River from September to August are analyzed . The results are as follows : First , the anomalous intensity of the two kinds of El Nino events from September to August can be reproduced . The results show that the precipitation in the south of the Yangtze River will increase approximately the next year and the precipitation in the south of the Yangtze River is close to the actual situation when the SST is strong enough .
For the middle - type El Nio , there is no stable relationship between the abnormal intensity of SST and the precipitation in the south of the Yangtze River in the summer of the next year .

【學(xué)位授予單位】:中國(guó)氣象科學(xué)研究院
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2014
【分類(lèi)號(hào)】:P732;P426.6

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 黃榮輝,吳儀芳;The Influence of ENSO on the Summer Climate Change in China and Its Mechanism[J];Advances in Atmospheric Sciences;1989年01期

2 張人禾;A Diagnostic Study of the Impact of El Ni濼on on the Precipitation in China[J];Advances in Atmospheric Sciences;1999年02期

3 孫淑清,應(yīng)明;Subtropical High Anomalies over the Western Pacific and Its Relations to the Asian Monsoon and SST Anomaly[J];Advances in Atmospheric Sciences;1999年04期

4 王亞非,FujiyaoshiYASUSHI,KatoKURANOSHIN;東亞夏季一個(gè)與鄂霍次克海阻高建立及副高北上相關(guān)的遙相關(guān)類(lèi)型(英)[J];Advances in Atmospheric Sciences;2003年02期

5 李根;任保華;楊成昀;鄭建秋;;Indices of El Ni濼o and El Ni濼o Modoki:An Improved El Ni濼o Modoki Index[J];Advances in Atmospheric Sciences;2010年05期

6 黃榮輝,孫鳳英;熱帶西太平洋暖池的熱狀態(tài)及其上空的對(duì)流活動(dòng)對(duì)東亞夏季氣候異常的影響[J];大氣科學(xué);1994年02期

7 龍振夏,李崇銀;赤道東太平洋不同持續(xù)時(shí)間的海溫正異常對(duì)東亞夏季氣候影響的數(shù)值模擬研究[J];大氣科學(xué);1999年02期

8 金祖輝,陶詩(shī)言;ENSO循環(huán)與中國(guó)東部地區(qū)夏季和冬季降水關(guān)系的研究[J];大氣科學(xué);1999年06期

9 應(yīng)明,孫淑清;西太平洋副熱帶高壓對(duì)熱帶海溫異常響應(yīng)的研究[J];大氣科學(xué);2000年02期

10 陳月娟,周任君,武海峰;Ni~■o1+2海區(qū)冷、暖水期西太平洋副高的特征及其對(duì)東亞季風(fēng)的影晌[J];大氣科學(xué);2002年03期



本文編號(hào):1775320

資料下載
論文發(fā)表

本文鏈接:http://sikaile.net/kejilunwen/haiyang/1775320.html


Copyright(c)文論論文網(wǎng)All Rights Reserved | 網(wǎng)站地圖 |

版權(quán)申明:資料由用戶(hù)15c60***提供,本站僅收錄摘要或目錄,作者需要?jiǎng)h除請(qǐng)E-mail郵箱bigeng88@qq.com