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首页> 外文会议>Remote Sensing of Clouds and the Atmosphere XII; Proceedings of SPIE-The International Society for Optical Engineering; vol.6745 >Diurnal radiative forcing of biomass burning aerosols over Africa from merged GERB and SEVIRI data
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Diurnal radiative forcing of biomass burning aerosols over Africa from merged GERB and SEVIRI data

机译：来自GERB和SEVIRI合并数据的非洲生物质燃烧气溶胶的日辐射强迫

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摘要

The synergy between the Geostationary Earth Radiation Budget (GERB) broadband radiometer and the Spinning Enhanced Visible and Infra Red Imager (SEVIRI) on board the European meteorological satellite Meteosat-8 is exploited to estimate the diurnal variation of the direct short wave aerosols radiative forcing (DSWARF) from biomass burning over Africa at sub-GERB footprint scale. Biomass burning are first identified at the SEVIRI resolution (3 km at nadir) by applying a multispectral thresholding algorithm to the SEVIRI spectral measurements. Reflected SW fluxes at the top-of-atmosphere for smoke aerosols are obtained by converting the measured GERB radiances at the 3 × 3 SEVIRI pixel window in term of flux using a theoretically derived smoke angular distribution model (ADM) based on the average scene identification from the 3 × 3 SEVIRI pixel box. The calculated smoke ADM is a function of aerosol optical depth, surface type and solar and viewing geometry. The TOA DSWARF for smoke aerosols is then estimated as the difference between radiative fluxes in the absence and presence of biomass burning aerosols. Finally, the calculated TOA fluxes for smoke aerosols are compared with those obtained without using dedicated smoke ADMs when performing the radiance to flux conversion. This is done to estimate the improvement in the near-real time processing of the GERB and SEVIRI data performed at the Royal Meteorological Institute of Belgium due to the introduction of the smoke ADMs.
机译：利用地球静止地球辐射预算（GERB）宽带辐射仪与欧洲气象卫星Meteosat-8上的自旋增强型可见光和红外成像仪（SEVIRI）之间的协同作用来估算直接短波气溶胶辐射强迫的日变化（ （DSWARF）来自非洲，其燃烧量低于GERB足迹。首先通过将多光谱阈值算法应用于SEVIRI光谱测量，以SEVIRI分辨率（最低点3 km）识别生物质燃烧。通过使用基于平均场景识别的理论推导的烟角分布模型（ADM），通过理论上转换的烟角分布模型（ADM），通过在3×3 SEVIRI像素窗口以通量换算转换测得的GERB辐射，从而获得烟气溶胶在大气顶部的反射SW通量。从3×3 SEVIRI像素框中。计算得出的烟雾ADM是气溶胶光学深度，表面类型以及太阳和观察几何形状的函数。然后将烟雾气溶胶的TOA DSWARF估算为不存在和存在生物质燃烧气溶胶时的辐射通量之差。最后，将计算出的烟雾气溶胶的TOA通量与在执行辐射量到通量转换时不使用专用烟雾ADM的通气量进行比较。这样做是为了估计由于引入了烟雾ADM而在比利时皇家气象学院进行的GERB和SEVIRI数据近实时处理的改进。

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