本文關(guān)鍵詞：東亞地區(qū)氣溶膠光學(xué)厚度與地面太陽輻射變化的聯(lián)系及其與夏季風(fēng)異常　出處：《南京信息工程大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 大氣氣溶膠光學(xué)厚度 地面太陽輻射 夏季風(fēng)環(huán)流 季節(jié)趨勢(shì) 年際異常 東亞地區(qū)

【摘要】：本文利用20002013年MODIS-Terra衛(wèi)星產(chǎn)品提供的氣溶膠光學(xué)厚度(aerosol optical depth,AOD)資料及NCEP/NCAR再分析資料集,使用SVD方法研究了夏季東亞地區(qū)AOD與到達(dá)地面太陽輻射(downward solar radiation flux,DSRF)相聯(lián)系的主要模態(tài),并分析了其與夏季風(fēng)變化的關(guān)系。主要得到以下結(jié)論：(1)夏季,東亞地區(qū)AOD與DSRF的氣候分布較為相似。在保留季節(jié)趨勢(shì)的情況下,運(yùn)用SVD方法對(duì)兩者進(jìn)行分解,結(jié)果表明東亞地區(qū)AOD與地面太陽輻射表現(xiàn)出較好的正相關(guān)關(guān)系,由于相對(duì)于年際變化而言,季節(jié)趨勢(shì)是更為主要的部分,因而這種同相關(guān)系可歸因于季風(fēng)活動(dòng)的季節(jié)性進(jìn)程。利用SVD1左場(chǎng)時(shí)間系數(shù)進(jìn)行相關(guān)分析發(fā)現(xiàn)：6月(除2013年外),當(dāng)中國(guó)東部氣溶膠AOD大而地面太陽輻射亦大時(shí),在中國(guó)東南部地區(qū)以及日本島南部,由于氣流輻合增強(qiáng)和較強(qiáng)的上升運(yùn)動(dòng),降水偏多,而由于副高位置偏南,使得中國(guó)中東部偏北地區(qū)水汽供應(yīng)偏弱,降水偏少。由于地面凈太陽輻射增強(qiáng),華北部分地區(qū)異常增暖。8月,情況則相反。這些說明夏季風(fēng)的季節(jié)進(jìn)程對(duì)氣溶膠、到達(dá)地面的太陽輻射變化等具有重要影響。(2)在扣除季節(jié)趨勢(shì)的情況下,運(yùn)用SVD方法對(duì)AOD和DSRF進(jìn)行分解,結(jié)果表明夏季,兩者呈現(xiàn)較好的反相關(guān)關(guān)系,即我們通常所認(rèn)識(shí)到的“陽傘效應(yīng)”。AOD變化的20%可顯著影響到達(dá)地表太陽輻射的10%左右。利用SVD1左場(chǎng)時(shí)間系數(shù)進(jìn)行相關(guān)分析發(fā)現(xiàn),當(dāng)AOD在中國(guó)東部偏北地區(qū)顯著增加和在華南沿海及南海地區(qū)減少時(shí),中國(guó)東部南北方加熱差異增大,而在南部地區(qū)則減小了海陸熱力差異,這又有利于海陸氣壓差的減小,從而減弱了夏季風(fēng)。減弱的夏季風(fēng)有利于南海-西太平洋以及華北和東北云量偏少,降水顯著偏少,但在中國(guó)東部的長(zhǎng)江流域及江南,降水有增加的傾向。中國(guó)東部長(zhǎng)江流域以南溫度降低,中國(guó)東部偏北地區(qū)溫度升高。(3)東亞地區(qū)AOD典型強(qiáng)(弱)年與夏季風(fēng)的弱(強(qiáng))年相對(duì)應(yīng)。區(qū)域平均AOD的強(qiáng)、弱年AOD的異常分布既受氣候平均的東亞季風(fēng)環(huán)流影響,同時(shí)也受異常夏季風(fēng)環(huán)流引起的氣溶膠異常分布的影響。視源匯項(xiàng)的影響也非常重要,其與降水的濕清除作用存在聯(lián)系。
[Abstract]:The aerosol optical depth provided by MODIS-Terra satellite products in 2000-2013 is used in this paper. Ado) data and NCEP/NCAR reanalysis data set. The SVD method is used to study AOD and downward solar radiation flux in East Asia in summer. The relationship between DSRF and summer monsoon variation is analyzed. The following conclusions are obtained: 1) Summer. The climate distribution of AOD and DSRF in East Asia is similar. The SVD method is used to decompose the AOD and DSRF under the condition of keeping the seasonal trend. The results show that there is a good positive correlation between AOD and surface solar radiation in East Asia, and the seasonal trend is more important than interannual variation. Therefore, this phase relationship can be attributed to the seasonal process of monsoon activity. The correlation analysis using SVD1 left field time coefficient shows that: June (except 2013). When the aerosol AOD is large and the surface solar radiation is high in eastern China, there is more precipitation in southeastern China and the southern part of Japan, due to the stronger convergence of air flow and the stronger upward movement. However, due to the southward position of the subtropical high, the water vapor supply is weak and the precipitation is low in the north-central part of China. Due to the enhancement of the surface net solar radiation, some parts of North China are abnormally warm. August. This indicates that the seasonal process of the summer monsoon has an important effect on aerosols, solar radiation to the ground, and so on. SVD method is used to decompose AOD and DSRF. The results show that there is a good inverse correlation between AOD and DSRF in summer. That is to say, 20% of the "parasol effect". 20% of the variation of AOD can significantly affect the solar radiation reaching the surface of the earth's surface about 10%. The correlation analysis of the time coefficient of SVD1 left field is carried out. When AOD increases significantly in the north-eastern part of China and decreases in the South China coastal and South China Sea, the heating difference between the south and north of China increases, while the thermal difference between the sea and the land decreases in the southern part of China. This, in turn, is beneficial to the decrease of the difference between sea and land pressure, which weakens the summer monsoon, which is beneficial to the decrease of clouds and precipitation in the South China Sea and the Western Pacific Ocean, as well as in North and Northeast China. However, precipitation tends to increase in the Yangtze River basin and south of the Yangtze River in eastern China, and the temperature in the south of the Yangtze River basin in eastern China is lower. The typical strong (weak) year of AOD in East Asia corresponds to the weak (strong) year of summer monsoon, and the regional average AOD is strong. The anomalous distribution of AOD in weak years is influenced not only by the average East Asian monsoon circulation, but also by the anomalous distribution of aerosol caused by the anomalous summer monsoon circulation. The apparent source and sink term is also very important. It is related to the wet removal of precipitation.
【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)】：X513;X16

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