東亞冬季風(fēng)對(duì)氣溶膠傳輸分布的影響研究
發(fā)布時(shí)間：2019-03-28 20:33
【摘要】：隨著東亞地區(qū)經(jīng)濟(jì)高速發(fā)展,氣溶膠成為最主要的大氣污染物之一,其時(shí)空分布除了排放源外,還將受到東亞季風(fēng)氣候的影響。本研究利用2000-2014年MODIS/AOD和1979-1999年TOMS/UVAI氣溶膠衛(wèi)星產(chǎn)品以及1979-2014年NCEP月平均氣象場(chǎng)再分析資料,分析了東亞冬季風(fēng)長期變化趨勢(shì)及東亞地區(qū)氣溶膠年際和季節(jié)變化規(guī)律。同時(shí)綜合運(yùn)用資料分析和RegCCMS數(shù)值模擬的研究方法,分析了東亞冬季風(fēng)強(qiáng)度變化對(duì)氣溶膠分布的影響,通過研究,得到以下主要結(jié)果：首先,基于衛(wèi)星觀測(cè)資料,分析了東亞地區(qū)氣溶膠時(shí)空分布特征。近十年,東亞地區(qū)AOD年際變化在0.4-0.5之間,春季AOD達(dá)到最大,平均值為0.55,夏季AOD次之,平均值為0.49,秋、冬季AOD達(dá)到最小,平均值為0.38。區(qū)域分布上,四個(gè)季節(jié)AOD高值區(qū)主要集中在四川盆地、長江中下游、華北平原等地區(qū)。春季,東亞地區(qū)AOD高值區(qū)范圍最廣,維持在32.5°N附近保持不變。夏季,華北平原AOD達(dá)到全年最高值,秋季,四川盆地和南部地區(qū)AOD有所上升,其它地區(qū)AOD開始下降。冬季,冬季,東亞地區(qū)AOD達(dá)到全年最小值。近十年東亞大部分地區(qū)AOD在冬季增加較夏季更為明顯,近10年來東亞地區(qū)冬季AOD呈現(xiàn)一個(gè)明顯的上升趨勢(shì),AOD最大值0.44,最小值0.36。進(jìn)入冬季后,整個(gè)東亞地區(qū)2月AOD高值區(qū)范圍最廣,強(qiáng)度最大,覆蓋整個(gè)四川盆地、華北平原及長江中下游大部分地區(qū),12月次之,1月最小圍最小,強(qiáng)度最弱。其次,利用2種不同冬季風(fēng)指數(shù)表征東亞冬季風(fēng)強(qiáng)弱變化,通過資料分析揭示了東亞冬季風(fēng)強(qiáng)弱變化對(duì)氣溶膠傳輸分布的影響。結(jié)果表明,東亞冬季風(fēng)存在明顯的年際和年代際差異,1979-2014年冬季風(fēng)出現(xiàn)逐漸減弱的趨勢(shì)。強(qiáng)冬季風(fēng)年,海陸氣壓差增大,東亞大槽加深增強(qiáng),東亞地區(qū)偏北風(fēng)異常,風(fēng)場(chǎng)的增強(qiáng)將引導(dǎo)更多冷空氣南下,從而給東亞大部分地區(qū)帶來明顯的降溫天氣。弱季風(fēng)年則相反。強(qiáng)弱冬季風(fēng)年AOD高值區(qū)位置大致不變,主要集中在工業(yè)發(fā)達(dá)的渤海灣、長江中下游、華北平原等地區(qū),說明導(dǎo)致冬季氣溶膠高值分布最主要的原因是當(dāng)?shù)氐娜藶榕欧�。相鄰�?qiáng)弱年差異分析表明,強(qiáng)冬季風(fēng)年東亞地區(qū)偏北風(fēng)增強(qiáng),將氣溶膠向南方輸送,東亞地區(qū)AOD出現(xiàn)“北低南高”的空間分布。弱冬季風(fēng)年,整個(gè)東亞地區(qū)偏北風(fēng)較常年減弱,導(dǎo)致氣溶膠集中在華北平原一帶,東亞地區(qū)AOD出現(xiàn)“北高南低”的空間分布。最后,挑選出兩個(gè)季風(fēng)指數(shù)共同表征的一組強(qiáng)年(2010年)和弱年(2005年),利用區(qū)域氣候化學(xué)模式RegCCMS開展數(shù)值模擬。數(shù)值模擬結(jié)果表明,東亞冬季風(fēng)的強(qiáng)弱變化能明顯影響氣溶膠的空間分布。強(qiáng)冬季風(fēng)年,東亞地區(qū)偏北風(fēng)增強(qiáng),將氣溶膠向南部輸送,大陸大部分地區(qū)氣溶膠柱含量為負(fù)距平。弱冬季風(fēng)年則相反,冬季風(fēng)減弱,大陸大部分地區(qū)氣溶膠柱含量為正距平。冬季風(fēng)強(qiáng)年與弱年冬季氣溶膠柱含量差異范圍-80mg·m-2-25mg·m-2。逐層分析表明,越靠近地面,強(qiáng)弱年間的差異越明顯,在地面氣溶膠濃度差異可達(dá)-14～30μg·m-3,在對(duì)850hPa氣溶膠濃度差異達(dá)-10～23μg·m-3
[Abstract]:With the rapid economic development of East Asia, the aerosol is one of the most important atmospheric pollutants, and its space-time distribution will be affected by the East Asian monsoon climate in addition to the emission source. In this study, the long-term trend of the winter monsoon in East Asia and the annual and seasonal variation of the aerosol in East Asia were analyzed by using the MODIS/ AOD of 2000-2014 and the TOMS/ UVAI aerosol satellite products from 1979 to 1999 and the average meteorological field re-analysis data from 1979 to 2014. At the same time, the influence of the change of the wind intensity on the distribution of the aerosol in East Asia was analyzed by means of the data analysis and the numerical simulation of RegCMS, and the following main results were obtained: first, the time-space distribution of the aerosol in East Asia was analyzed based on the observation data of the satellite. In the last ten years, the annual variation of AOD in East Asia is between 0.4 and 0.5, the AOD of spring reaches the maximum, the average value is 0.55, the summer AOD is the second, the average value is 0.49, the autumn and the winter AOD reach the minimum, and the average value is 0.38. In the regional distribution, the AOD high-value area of the four seasons is mainly concentrated in the Sichuan Basin, the middle and lower reaches of the Yangtze River, the North China Plain and other areas. In spring, the high-value region of AOD in East Asia is the most widespread and remains unchanged at 32.5 擄 N. In the summer, the AOD of the North China Plain reached the highest in the whole year, and the AOD in the autumn, the Sichuan and the southern regions increased, and the AOD in other regions began to decline. In winter, in winter, the AOD of East Asia reaches the minimum of the year. In the last ten years, the AOD in most of East Asia is more obvious in the winter, and in the last 10 years, the AOD in East Asia has an obvious rising trend, and the AOD maximum value is 0.44 and the minimum value is 0.36. After entering the winter, the AOD high-value region in the whole East Asia region is the largest in the whole region, with the largest intensity, covering most of the whole Sichuan Basin, the North China Plain and the middle and lower reaches of the Yangtze River, followed by December, with the smallest surrounding area and the weakest strength in January. Secondly, using the two different winter wind indices to characterize the change of the East Asian winter monsoon, the effect of the change of the winter monsoon in East Asia on the distribution of the aerosol transport was revealed through the data analysis. The results show that there is an obvious interannual and inter-year difference in the winter monsoon in East Asia, and the trend of the gradual weakening of the winter monsoon in 1979-2014. In that wind year of the strong winter, the air pressure difference of the sea and the sea is increase, the east Asia large groove is enhanced, the north wind of east Asia is abnormal, the enhancement of the wind field will lead more cool air to the south, so as to bring obvious cooling weather to most of the east Asia. The weak monsoon year is the opposite. The position of AOD high value area in the wind year of the strong and weak winter is approximately the same, mainly in the industrial developed Bohai Bay, the middle and lower reaches of the Yangtze River, the North China Plain and other areas, which indicates that the most important reason for the high-value distribution of the aerosol in the winter is the local man-made emission. The analysis of the difference between the two adjacent strengths shows that the north wind in East Asia is enhanced by the strong winter monsoon, and the aerosol is transported to the south, and the spatial distribution of the "North and South High" in the AOD in East Asia is shown. In the weak winter, the north wind in the whole East Asia is less than the year, leading to the concentration of the aerosol in the North China Plain, and the AOD of East Asia has the spatial distribution of the "North Gannan Low". Finally, a group of strong years (2010) and a weak year (2005) co-characterized by two monsoon indices were selected, and numerical simulation was carried out using the regional climate chemistry model RegCMS. The numerical simulation results show that the change of the intensity of the winter monsoon in East Asia can significantly affect the spatial distribution of the aerosol. In the strong winter, the north wind in East Asia is enhanced, and the aerosol is transported to the south, and the content of the aerosol column in most parts of the mainland is negative. In the weak winter, the wind in winter is the opposite, the winter monsoon is weakened, and the content of the aerosol column in most parts of the mainland is normal. The difference of the content of the aerosol in the winter and the weak year is 80 mg 路 m-2-25 mg 路 m-2. The result of layer-by-layer analysis shows that the closer to the ground, the more obvious the difference between the strength and the strength, the difference in the concentration of the aerosol in the ground can reach -14-30ug 路 m-3, and the difference of the concentration of the aerosol at 850 hPa is-10-23 & mu; g 路 m-3.
【學(xué)位授予單位】：南京大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：X513;P425.42
本文編號(hào)：2449206
[Abstract]:With the rapid economic development of East Asia, the aerosol is one of the most important atmospheric pollutants, and its space-time distribution will be affected by the East Asian monsoon climate in addition to the emission source. In this study, the long-term trend of the winter monsoon in East Asia and the annual and seasonal variation of the aerosol in East Asia were analyzed by using the MODIS/ AOD of 2000-2014 and the TOMS/ UVAI aerosol satellite products from 1979 to 1999 and the average meteorological field re-analysis data from 1979 to 2014. At the same time, the influence of the change of the wind intensity on the distribution of the aerosol in East Asia was analyzed by means of the data analysis and the numerical simulation of RegCMS, and the following main results were obtained: first, the time-space distribution of the aerosol in East Asia was analyzed based on the observation data of the satellite. In the last ten years, the annual variation of AOD in East Asia is between 0.4 and 0.5, the AOD of spring reaches the maximum, the average value is 0.55, the summer AOD is the second, the average value is 0.49, the autumn and the winter AOD reach the minimum, and the average value is 0.38. In the regional distribution, the AOD high-value area of the four seasons is mainly concentrated in the Sichuan Basin, the middle and lower reaches of the Yangtze River, the North China Plain and other areas. In spring, the high-value region of AOD in East Asia is the most widespread and remains unchanged at 32.5 擄 N. In the summer, the AOD of the North China Plain reached the highest in the whole year, and the AOD in the autumn, the Sichuan and the southern regions increased, and the AOD in other regions began to decline. In winter, in winter, the AOD of East Asia reaches the minimum of the year. In the last ten years, the AOD in most of East Asia is more obvious in the winter, and in the last 10 years, the AOD in East Asia has an obvious rising trend, and the AOD maximum value is 0.44 and the minimum value is 0.36. After entering the winter, the AOD high-value region in the whole East Asia region is the largest in the whole region, with the largest intensity, covering most of the whole Sichuan Basin, the North China Plain and the middle and lower reaches of the Yangtze River, followed by December, with the smallest surrounding area and the weakest strength in January. Secondly, using the two different winter wind indices to characterize the change of the East Asian winter monsoon, the effect of the change of the winter monsoon in East Asia on the distribution of the aerosol transport was revealed through the data analysis. The results show that there is an obvious interannual and inter-year difference in the winter monsoon in East Asia, and the trend of the gradual weakening of the winter monsoon in 1979-2014. In that wind year of the strong winter, the air pressure difference of the sea and the sea is increase, the east Asia large groove is enhanced, the north wind of east Asia is abnormal, the enhancement of the wind field will lead more cool air to the south, so as to bring obvious cooling weather to most of the east Asia. The weak monsoon year is the opposite. The position of AOD high value area in the wind year of the strong and weak winter is approximately the same, mainly in the industrial developed Bohai Bay, the middle and lower reaches of the Yangtze River, the North China Plain and other areas, which indicates that the most important reason for the high-value distribution of the aerosol in the winter is the local man-made emission. The analysis of the difference between the two adjacent strengths shows that the north wind in East Asia is enhanced by the strong winter monsoon, and the aerosol is transported to the south, and the spatial distribution of the "North and South High" in the AOD in East Asia is shown. In the weak winter, the north wind in the whole East Asia is less than the year, leading to the concentration of the aerosol in the North China Plain, and the AOD of East Asia has the spatial distribution of the "North Gannan Low". Finally, a group of strong years (2010) and a weak year (2005) co-characterized by two monsoon indices were selected, and numerical simulation was carried out using the regional climate chemistry model RegCMS. The numerical simulation results show that the change of the intensity of the winter monsoon in East Asia can significantly affect the spatial distribution of the aerosol. In the strong winter, the north wind in East Asia is enhanced, and the aerosol is transported to the south, and the content of the aerosol column in most parts of the mainland is negative. In the weak winter, the wind in winter is the opposite, the winter monsoon is weakened, and the content of the aerosol column in most parts of the mainland is normal. The difference of the content of the aerosol in the winter and the weak year is 80 mg 路 m-2-25 mg 路 m-2. The result of layer-by-layer analysis shows that the closer to the ground, the more obvious the difference between the strength and the strength, the difference in the concentration of the aerosol in the ground can reach -14-30ug 路 m-3, and the difference of the concentration of the aerosol at 850 hPa is-10-23 & mu; g 路 m-3.
【學(xué)位授予單位】：南京大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：X513;P425.42
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