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首页> 外文期刊>Applied optics >Empirical correction of multifilter rotating shadowband radiometer (MFRSR) aerosol optical depths for the aerosol forward scattering and development of a long-term integrated MFRSR-Cimel dataset at Lampedusa
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Empirical correction of multifilter rotating shadowband radiometer (MFRSR) aerosol optical depths for the aerosol forward scattering and development of a long-term integrated MFRSR-Cimel dataset at Lampedusa

机译：对兰佩杜萨气溶胶正向散射的多滤镜旋转阴影带辐射计（MFRSR）气溶胶光学深度的经验校正和长期综合MFRSR-Cimel数据集的开发

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Aerosol optical properties have been measured on the island of Lampedusa (35.5 degrees N, 12.6 degrees E) with seven-band multifilter rotating shadowband radiometers (MFRSRs) and a CE 318 Cimel sunphotometer (part of the AERONET network) since 1999. Four different MFRSRs have operated since 1999. The Cimel sunphotometer has been operational for a short period in 2000 and in 2003-2006 and 2010-present. Simultaneous determinations of the aerosol optical depth (AOD) from the two instruments were compared over a period of almost 4 years at several wavelengths between 415 and 870 nm. This is the first long-term comparison at a site strongly influenced by desert dust and marine aerosols and characterized by frequent cases of elevated AOD. The datasets show a good agreement, with MFRSR underestimating the Cimel AOD in cases with low Angstrom exponent; the underestimate decreases for increasing wavelength and increases with AOD. This underestimate is attributed to the effect of aerosol forward scattering on the relatively wide field of view of the MFRSR. An empirical correction of the MFRSR data was implemented. After correction, the mean bias (MB) between MFRSR and Cimel simultaneous AOD determinations is always smaller than 0.004, and the root mean square difference is <= 0.031 at all wavelengths. The MB between MFRSR and Cimel monthly averages (for months with at least 20 days with AOD determinations) is 0.0052. Thus, by combining the MFRSR and Cimel observations, an integrated long-term series is obtained, covering the period 1999-present, with almost continuous measurements since early 2002. The long-term data show a small (nonstatistically significant) decreasing trend over the period 2002-2013, in agreement with independent observations in the Mediterranean. The integrated Lampedusa dataset will be used for aerosol climatological studies and for verification of satellite observations and model analyses. (C) 2015 Optical Society of America
机译：自1999年以来，已使用七波段多滤光片旋转阴影带辐射计（MFRSR）和CE 318 Cimel太阳光度计（AERONET网络的一部分）在兰佩杜萨岛（北纬35.5度，东经12.6度）上测量了气溶胶光学特性。四种不同的MFRSR自1999年以来一直运行。Cimel日光计在2000年以及2003-2006年和2010年至今已经运行了一段时间。在415和870 nm之间的几种波长下，在近4年的时间里，比较了两种仪器同时测定的气溶胶光学深度（AOD）。这是在一个受到沙漠粉尘和海洋气溶胶强烈影响且经常出现AOD升高的特征的地点的首次长期比较。数据集显示出很好的一致性，在低埃数指数的情况下，MFRSR低估了Cimel AOD;低估随着波长的增加而降低，并随着AOD的增加而降低。这种低估归因于气溶胶前向散射对MFRSR相对较宽的视野的影响。对MFRSR数据进行了经验校正。校正后，MFRSR和Cimel同时进行AOD测定的平均偏差（MB）始终小于0.004，并且在所有波长下均方根差均<= 0.031。 MFRSR和Cimel月平均值之间的MB（对于确定AOD至少为20天的月份为0.0052）。因此，通过将MFRSR和Cimel观测值结合起来，获得了一个涵盖1999年至今的综合长期序列，自2002年初以来几乎连续进行了测量。长期数据显示，该区域的下降趋势较小（无统计学意义）。在2002-2013年期间，与地中海地区的独立观测结果一致。完整的Lampedusa数据集将用于气溶胶气候研究以及卫星观测和模型分析的验证。 （C）2015年美国眼镜学会

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