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艾比湖流域气溶胶光学厚度时空演变及影响因素
摘要点击 2243  全文点击 655  投稿时间:2019-04-22  修订日期:2019-06-18
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中文关键词  气溶胶光学厚度(AOD)  随机森林模型(RF)  深蓝算法(DB)  艾比湖流域  时空变化
英文关键词  aerosol optical depth (AOD)  random forest model(RF)  deep blue algorithm (DB)  Ebinur Lake Basin  spatial and temporal changes
作者单位E-mail
陈香月 新疆大学资源与环境科学学院, 智慧城市与环境建模自治区普通高校重点实验室, 乌鲁木齐 830046
新疆大学绿洲生态教育部重点实验室, 乌鲁木齐 830046 
cxy.19940520@gmail.com 
丁建丽 新疆大学资源与环境科学学院, 智慧城市与环境建模自治区普通高校重点实验室, 乌鲁木齐 830046
新疆大学绿洲生态教育部重点实验室, 乌鲁木齐 830046 
watarid@xju.edu.cn 
王敬哲 新疆大学资源与环境科学学院, 智慧城市与环境建模自治区普通高校重点实验室, 乌鲁木齐 830046
新疆大学绿洲生态教育部重点实验室, 乌鲁木齐 830046 
 
葛翔宇 新疆大学资源与环境科学学院, 智慧城市与环境建模自治区普通高校重点实验室, 乌鲁木齐 830046
新疆大学绿洲生态教育部重点实验室, 乌鲁木齐 830046 
 
梁静 新疆大学资源与环境科学学院, 智慧城市与环境建模自治区普通高校重点实验室, 乌鲁木齐 830046
新疆大学绿洲生态教育部重点实验室, 乌鲁木齐 830046 
 
中文摘要
      气溶胶光学厚度(AOD)描述了气溶胶对光的衰减作用,并在一定程度上反映区域大气污染程度.本研究以2000年~2015年长时间序列MOD09A1数据为本底,在生成查找表的基础上,采用深蓝算法(DB)对艾比湖流域2000年~2015年Landsat TM/ETM+/OLI数据进行AOD遥感估算,分析艾比湖流域AOD时空变化特征,结合环境变量选用随机森林模型(RF)对AOD进行预测及因子贡献度排序.结果表明:①艾比湖流域AOD呈现显著的季节性变化特征,AOD值春季(0.414) > 夏季(0.390) > 秋季(0.287),其中春季变化幅度最大.②艾比湖流域平均AOD为0.374,年际变化整体表现为上升趋势,但在2010~2015年间AOD增加较快,年际增幅达到32.32%,表明该流域近15年间的大气污染不断加剧,近5年尤甚.③艾比湖流域AOD空间分布从艾比湖北部到南部呈阶梯式上升变化,其中,精河县污染最为突显,AOD值达到0.483.4RF模型对AOD的预测效果较好,R2=0.866,RMSE=0.042,其中蒸散发对艾比湖流域AOD影响最为显著.
英文摘要
      Aerosol optical depth (AOD) describes the attenuation of light by aerosols and reflects the degree of regional air pollution to some extent. This study was based on the data from the long-term sequence MOD09A1 from 2000 to 2015 and the generation of a lookup table using the deep blue algorithm (DB) to perform AOD remote sensing estimation on the Landsat TM/ETM+/OLI data from the Ebinur Lake Basin to analyze the temporal and spatial variation characteristics of AOD in the Ebinur Lake Basin and to perform an AOD prediction and factor contribution ranking using the random forest model (RF) combined with environmental variables. The results showed that:① AOD of Ebinur Lake Basin has significant seasonal variation characteristics, and the AOD values were spring (0.414) > summer (0.390) > autumn (0.287), with the largest variation in spring. ② The AOD average of the Ebinur Lake Basin was 0.374, and the interannual variation as a whole showed an upward trend. However, the AOD increased rapidly during 2010-2015, with an interannual increase of 32.32%, which indicated increasing air pollution in the basin over the past 15 years, especially the past five years. ③ The spatial distribution of AOD in the Ebinur Lake Basin was stepped up from the north to the south of Lake Ebinur. In this area, the pollution in Jinghe County was the most prominent, and the AOD value reached 0.483. ④ The RF model had a good predictive effect on AOD, R2=0.866, RMSE=0.042, and evapotranspiration had the most significant effect on AOD in the Ebinur Lake basin.

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