东亚冬季风对气溶胶传输分布的影响研究
发布时间：2019-03-28 20:33
【摘要】：随着东亚地区经济高速发展,气溶胶成为最主要的大气污染物之一,其时空分布除了排放源外,还将受到东亚季风气候的影响。本研究利用2000-2014年MODIS/AOD和1979-1999年TOMS/UVAI气溶胶卫星产品以及1979-2014年NCEP月平均气象场再分析资料,分析了东亚冬季风长期变化趋势及东亚地区气溶胶年际和季节变化规律。同时综合运用资料分析和RegCCMS数值模拟的研究方法,分析了东亚冬季风强度变化对气溶胶分布的影响,通过研究,得到以下主要结果：首先,基于卫星观测资料,分析了东亚地区气溶胶时空分布特征。近十年,东亚地区AOD年际变化在0.4-0.5之间,春季AOD达到最大,平均值为0.55,夏季AOD次之,平均值为0.49,秋、冬季AOD达到最小,平均值为0.38。区域分布上,四个季节AOD高值区主要集中在四川盆地、长江中下游、华北平原等地区。春季,东亚地区AOD高值区范围最广,维持在32.5°N附近保持不变。夏季,华北平原AOD达到全年最高值,秋季,四川盆地和南部地区AOD有所上升,其它地区AOD开始下降。冬季,冬季,东亚地区AOD达到全年最小值。近十年东亚大部分地区AOD在冬季增加较夏季更为明显,近10年来东亚地区冬季AOD呈现一个明显的上升趋势,AOD最大值0.44,最小值0.36。进入冬季后,整个东亚地区2月AOD高值区范围最广,强度最大,覆盖整个四川盆地、华北平原及长江中下游大部分地区,12月次之,1月最小围最小,强度最弱。其次,利用2种不同冬季风指数表征东亚冬季风强弱变化,通过资料分析揭示了东亚冬季风强弱变化对气溶胶传输分布的影响。结果表明,东亚冬季风存在明显的年际和年代际差异,1979-2014年冬季风出现逐渐减弱的趋势。强冬季风年,海陆气压差增大,东亚大槽加深增强,东亚地区偏北风异常,风场的增强将引导更多冷空气南下,从而给东亚大部分地区带来明显的降温天气。弱季风年则相反。强弱冬季风年AOD高值区位置大致不变,主要集中在工业发达的渤海湾、长江中下游、华北平原等地区,说明导致冬季气溶胶高值分布最主要的原因是当地的人为排放。相邻强弱年差异分析表明,强冬季风年东亚地区偏北风增强,将气溶胶向南方输送,东亚地区AOD出现“北低南高”的空间分布。弱冬季风年,整个东亚地区偏北风较常年减弱,导致气溶胶集中在华北平原一带,东亚地区AOD出现“北高南低”的空间分布。最后,挑选出两个季风指数共同表征的一组强年(2010年)和弱年(2005年),利用区域气候化学模式RegCCMS开展数值模拟。数值模拟结果表明,东亚冬季风的强弱变化能明显影响气溶胶的空间分布。强冬季风年,东亚地区偏北风增强,将气溶胶向南部输送,大陆大部分地区气溶胶柱含量为负距平。弱冬季风年则相反,冬季风减弱,大陆大部分地区气溶胶柱含量为正距平。冬季风强年与弱年冬季气溶胶柱含量差异范围-80mg·m-2-25mg·m-2。逐层分析表明,越靠近地面,强弱年间的差异越明显,在地面气溶胶浓度差异可达-14～30μg·m-3,在对850hPa气溶胶浓度差异达-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 掳 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.
【学位授予单位】：南京大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：X513;P425.42
本文编号：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 掳 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.
【学位授予单位】：南京大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：X513;P425.42
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