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首页> 外文期刊>Atmospheric chemistry and physics >The regime of aerosol asymmetry parameter over Europe, the Mediterranean and the Middle East based on MODIS satellite data: evaluation against surface AERONET measurements
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The regime of aerosol asymmetry parameter over Europe, the Mediterranean and the Middle East based on MODIS satellite data: evaluation against surface AERONET measurements

机译：基于MODIS卫星数据的欧洲，地中海和中东的气雾不对称参数的制度：对表面AERONET测量的评估

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摘要

Atmospheric particulates are a significant forcing agent for the radiative energy budget of the Earth-atmosphere system. The particulates' interaction with radiation, which defines their climate effect, is strongly dependent on their optical properties. In the present work, we study one of the most important optical properties of aerosols, the asymmetry parameter (g(aer)), over sea surfaces of the region comprising North Africa, the Arabian Peninsula, Europe, and the Mediterranean Basin. These areas are of great interest, because of the variety of aerosol types they host, both anthropogenic and natural. Using satellite data from the collection 051 of MODIS (Moderate Resolution Imaging Spectro-radiometer, Terra and Aqua), we investigate the spatiotemporal characteristics of the asymmetry parameter. We generally find significant spatial variability, with larger values over regions dominated by larger size particles, e.g., outside the Atlantic coasts of northwestern Africa, where desert-dust outflow takes place. The g(aer) values tend to decrease with increasing wavelength, especially over areas dominated by small particulates. The intra-annual variability is found to be small in desert-dust areas, with maximum values during summer, while in all other areas larger values are reported during the cold season and smaller during the warm. Significant intra-annual and inter-annual variability is observed around the Black Sea. However, the inter-annual trends of g(aer) are found to be generally small.
机译：大气颗粒是地球大气系统的辐射能量预算的重要迫使剂。颗粒物与辐射的相互作用定义其气候效应，强烈依赖于它们的光学性质。在目前的工作中，我们研究了气溶胶中最重要的光学性质，不对称参数（G（AER）），包括北非，阿拉伯半岛，欧洲和地中海盆地的地区的海面。这些领域具有很大的兴趣，因为它们宿主的气溶胶类型各种，人为和自然。使用来自MODIS的收集051的卫星数据（适度分辨率成像光谱仪，Terra和Aqua），我们研究了不对称参数的时空特性。我们通常会发现显着的空间变异性，在大尺寸粒子之外的区域，例如，在西北非洲的大西洋海岸之外，较大的区域。 G（AER）值倾向于随着波长的增加而降低，尤其是由小颗粒主导的区域。在夏季期间，在沙漠粉尘区域中发现年度内变异性较小，最大值，而在寒冷的季节期间报告了较大的值，在寒冷的季节中报告更大的值。在黑海周围观察到显着的年度年度和年度年度变异性。然而，发现G（AER）的年度阶段趋势一般很小。

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