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Satellite-based separation of climatic and surface influences on global aerosol change
International Journal of Remote Sensing ( IF 3.4 ) Pub Date : 2020-04-21 , DOI: 10.1080/01431161.2020.1731934
Huihui Feng 1, 2 , Bin Zou 1, 2
Affiliation  

ABSTRACT Both climatic and surface factors affect aerosol change. It is crucial to separate these influences for environment management and air pollution controlling. Though numerous models have been applied to assess contributions of climatic and surface influences, the results were great controversy because of the models’ avoidable uncertainties from initial conditions, model error, and prediction scenarios. Here, we separate the contribution of climatic and surface influences on global aerosol change through satellite observations and statistical methods. Satellite and ground observation data sets of global aerosol, climatic (precipitation, windspeed, temperature, and relative humidity) and surface (land cover and terrain) factors are collected for the investigation. Methodologically, a multilinear regression (MLR) model is first built to simulate the theoretical influence of climatic factors under conditions with a fixed surface influence. Then, the actual surface influence is estimated by measuring the residual trend between observed and MLR-simulated results. Our results show that global aerosol was reduced in the past decade (2001–2016), represented by a temporal trend of −0.00105 a −1 in the aerosol optical depth (AOD). Both climatic and surface factors tend to enhance the reduction of global aerosol. Specifically, the climatic and surface influences are −0.00041 a −1 and 0.00064 a −1, which contribute 39.05% and 60.95% of global aerosol reduction, respectively. Spatially, surface influence is more heterogeneous compared to climatic influence due to the spatial variability of surface properties. Meanwhile, the interaction of climatic and surface factors plays a significant effect on the magnitude and sign of the individual influence, with extreme climate strongly disturbing surface influence. It could be concluded that surface influence acts as the primary contribution to global aerosol change, which fluctuates with the interaction of climate change.

中文翻译:

气候和地表对全球气溶胶变化影响的卫星分离

摘要 气候和地表因素都会影响气溶胶的变化。将这些影响区分开来对环境管理和空气污染控制至关重要。尽管已经应用了许多模型来评估气候和地表影响的贡献,但由于模型在初始条件、模型误差和预测场景中存在可避免的不确定性,因此结果存在很大争议。在这里,我们通过卫星观测和统计方法分离了气候和地表对全球气溶胶变化的影响。收集全球气溶胶、气候(降水、风速、温度和相对湿度)和地表(土地覆盖和地形)因素的卫星和地面观测数据集用于调查。在方法论上,首先建立多元线性回归(MLR)模型,模拟在固定地表影响条件下气候因素的理论影响。然后,通过测量观测结果和 MLR 模拟结果之间的残余趋势来估计实际的表面影响。我们的结果表明,全球气溶胶在过去十年(2001-2016 年)减少,表现为气溶胶光学深度 (AOD) 的时间趋势 -0.00105 a -1。气候和地表因素都倾向于促进全球气溶胶的减少。具体而言,气候和地表影响分别为 -0.00041 a -1 和 0.00064 a -1,分别贡献了全球气溶胶减少的 39.05% 和 60.95%。在空间上,由于地表特性的空间可变性,与气候影响相比,地表影响更加多样化。同时,气候和地表因素的相互作用对个体影响的大小和符号有显着影响,极端气候强烈干扰地表影响。可以得出结论,地表影响是对全球气溶胶变化的主要贡献,它随着气候变化的相互作用而波动。
更新日期:2020-04-21
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