Can satellite-derived aerosol optical depth quantify the surface aerosol radiative forcing?
Can satellite-derived aerosol optical depth quantify the surface aerosol radiative forcing?
复制标题
卫星气溶胶光学深度可以量化表面气溶胶辐射强迫吗？
DOI：
10.1016/j.atmosres.2014.07.008
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发表时间：
2014-12
影响因子：
5.5
通讯作者：
Xue Yong
中科院分区：
文献类型：
--
作者：
Ceamanos, Xavier;Roujean, Jean-Louis;Carrer, Dominique;Xue Yong
气溶胶通过气溶胶辐射强迫（ARF）对地球气候起着重要作用。目前，利用低地球轨道和地球静止轨道卫星的遥感技术对气溶胶粒子进行探测、量化和监测。在本文中，使用卫星派生的AOD（气溶胶光学厚度）产品进行了研究，以量化每天在地面水平（SARF）的ARF。我们所指的每日平均SARF值是根据每个站的可用AOD卫星测量值每天计算的。在研究的第一部分中，四个国家的最先进的不同的AOD产品（MODIS-DT，MODIS-DB，MISR，和SEVIRI）的性能进行了评估，通过比较地面AOD测量24 AERONET站位于欧洲和非洲在6个月的时间。虽然发现所有气溶胶光学厚度产品在测量值方面都具有可比性（低气溶胶光学厚度值和平均气溶胶光学厚度值的均方根误差为0.1），但由于地球同步轨道卫星的扫描频率提高，因此可提供更多的气溶胶光学厚度估计值。实验表明，在非洲网站（RMSE为0.2），这表明最高的气溶胶浓度沿着与尘埃气溶胶，粗颗粒，和明亮的表面的AOD估计一般较低的协议。在这项研究的第二部分中，从卫星获得的气溶胶负担的置信度的经验教训被用来估计在晴空条件下的SARF。虽然使用SEVIRI等地球同步轨道观测所提供的AOD产品改进了SARF对低地轨道AOD产品的估计，由此产生的绝对偏差（当AERONET AOD用作参考时，平均为13 W/m2）与本研究中发现的SARF平均值相比，判断为仍然较高（从− 25 W/m2到− 43 W/m2）以及文献中的（从− 10 W/m2到− 47 W/m2）。
Aerosols play an important role in the climate of the Earth through aerosol radiative forcing (ARF). Nowadays, aerosol particles are detected, quantified and monitored by remote sensing techniques using low Earth orbit (LEO) and geostationary (GEO) satellites. In the present article, the use of satellite-derived AOD (aerosol optical depth) products is investigated in order to quantify on a daily basis the ARF at the surface level (SARF). By daily basis we mean that an average SARF value is computed every day based upon the available AOD satellite measurements for each station. In the first part of the study, the performance of four state-of-art different AOD products (MODIS-DT, MODIS-DB, MISR, and SEVIRI) is assessed through comparison against ground-based AOD measurements from 24 AERONET stations located in Europe and Africa during a 6-month period. While all AOD products are found to be comparable in terms of measured value (RMSE of 0.1 for low and average AOD values), a higher number of AOD estimates is made available by GEO satellites due to their enhanced frequency of scan. Experiments show a general lower agreement of AOD estimates over the African sites (RMSE of 0.2), which show the highest aerosol concentrations along with the occurrence of dust aerosols, coarse particles, and bright surfaces. In the second part of this study, the lessons learned about the confidence in aerosol burden derived from satellites are used to estimate SARF under clear sky conditions. While the use of AOD products issued from GEO observations like SEVIRI brings improvement in the SARF estimates with regard to LEO-based AOD products, the resulting absolute bias (13 W/m2in average when AERONET AOD is used as reference) is judged to be still high in comparison with the average values of SARF found in this study (from − 25 W/m2to − 43 W/m2) and also in the literature (from − 10 W/m2to − 47 W/m2).
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