| 基于MODIS_C006的乌鲁木齐10年气溶胶光学厚度变化特征 |
| 摘要点击 2590 全文点击 909 投稿时间：2017-10-17 修订日期：2018-01-22 |
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| 中文关键词 MODIS_C006 气溶胶光学厚度 乌鲁木齐 时空分布 年际变化 |
| 英文关键词 MODIS_C006 aerosol optical depth(AOD) Urumqi City spatial and temporal distribution interannual variability |
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| 中文摘要 |
| 利用2006~2015年美国NASA地球观测系统（EOS）中分辨成像仪MODIS Level2 10 km分辨率产品MYD04_L2_C006数据，分析乌鲁木齐市存在轻度以上（包括轻度）大气污染状况下的10年气溶胶光学厚度变化特征.结果表明，乌鲁木齐市10年平均AOD年内呈单峰分布，AOD从1~4月逐渐增大，4月达全年峰值，为0.37±0.19，10月达到最低值，为0.22±0.20；受春季沙尘天气频发影响，AOD季节变化特征表现为春季最大，城区大气污染状况严重，夏季、冬季次之，秋季最小，且乌鲁木齐市区大气污染状况较郊区严重；10年AOD均值为0.293；2006年出现AOD年均最高值为0.33，最低值出现在2008年，为0.24，较2007年单年降幅达23.3%.乌鲁木齐市10年AOD年际变化呈上升趋势，且低值点与高值点较以往研究均有不同程度增幅，虽然2015年出现减弱势头，乌鲁木齐市近10年的大气污染状况仍较严重，仍需加强控制. |
| 英文摘要 |
| Based on the MYD04_L2_C006 dataset gained from Moderate resolution imaging spectroradiometer MODIS Level 2 at 10 km resolution of NASA's EOS (Earth Observing System) from 2006 to 2015, the aerosol optical depths (AODs) for 10 years under the condition of mild above atmospheric pollution (including mild) were analyzed for Urumqi City. The results showed that the average AODs in Urumqi were unimodally distribution over the 10 years. From January to April, the AODs gradually increased. During a year, the annual peak of 0.37±0.19 was in April, and the lowest value of 0.22±0.20 was in October. Owing to the frequent occurrence of dust weather conditions in spring, the largest seasonal variation of AOD was in spring, as the air pollution in the entire area was very serious, followed by summer and winter, with the smallest in autumn. In addition, the urban area was the high AOD value area in Urumqi, as its air pollution was more severe than that in the suburbs. The average value of AOD during the 10 years was 0.293. The highest value of AOD was 0.33 in 2006, and the lowest value of 0.24 was in 2008, which declined to 23.3% of that in 2007. The annual change in AOD in Urumqi over the 10 years rose steadily. Compared with previous studies, the lowest and highest values were both higher to different degrees. Despite the deduction trend in 2015, air pollution in Urumqi was serious in the studied decade, and thus control of such needs to be strengthened. |
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