Evaluation of the new ESR network software for the retrieval of direct sun products from CIMEL CE318 and PREDE POM01 sun-sky radiometers
Evaluation of the new ESR network software for the retrieval of direct sun products from CIMEL CE318 and PREDE POM01 sun-sky radiometers
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DOI：
10.5194/acp-12-11619-2012
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发表时间：
2012-01-01
影响因子：
6.3
通讯作者：
Martinez-Lozano, J. A.
中科院分区：
文献类型：
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作者：
Estelles, V.;Campanelli, M.;Martinez-Lozano, J. A.
欧洲天网辐射计网络（EuroSkyRad或ESR）是最近建立的欧洲PREDE太阳天空辐射计研究网络。此外，欧洲遥感卫星还与SKYNET联合，后者是一个主要分布在东亚的PREDE太阳天空辐射计国际网络。与SKYNET相比，欧洲网络还集成了CIMEL CE 318天空-太阳光度计的用户。考虑到仪器的双重性，开发了一套开放源代码算法，由两个模块组成：（1）从太阳消光测量中检索直射太阳产品（气溶胶光学厚度，波长指数和水汽）;（2）反演天空辐射，以获得其他气溶胶光学特性，如尺寸分布，单次散射折射率或折射率。在这项研究中，我们评估了ESR直接太阳产品与AERONET（AERONET）产品的比较。具体来说，我们已经应用ESR算法的CIMEL CE 318和PREDE POM同时为4年的数据库测量在布尔雅索特网站（瓦伦西亚，西班牙），并比较所得产品与AERONET直接太阳测量获得相同的CIMEL CE 318天空太阳光度计。比较结果表明，气溶胶光学厚度差异大多是在标称的不确定度为0.003的标准校准仪器，并落在标称的AERONET的不确定度为0.01-0.02的现场仪器在光谱范围340至1020 nm。在Angstrom指数和柱状水汽的情况下，差异分别小于0.02和0.15 cm。因此，我们提出了一个开放源代码的程序，可用于CIMEL和PREDE天空辐射计，其结果相当于AERONET和SKYNET检索。
The European Skynet Radiometers network (EuroSkyRad or ESR) has been recently established as a research network of European PREDE sun-sky radiometers. Moreover, ESR is federated with SKYNET, an international network of PREDE sun-sky radiometers mostly present in East Asia. In contrast to SKYNET, the European network also integrates users of the CIMEL CE318 sky-sun photometer. Keeping instrumental duality in mind, a set of open source algorithms has been developed consisting of two modules for (1) the retrieval of direct sun products (aerosol optical depth, wavelength exponent and water vapor) from the sun extinction measurements; and (2) the inversion of the sky radiance to derive other aerosol optical properties such as size distribution, single scattering albedo or refractive index. In this study we evaluate the ESR direct sun products in comparison with the AERosol RObotic NETwork (AERONET) products. Specifically, we have applied the ESR algorithm to a CIMEL CE318 and PREDE POM simultaneously for a 4-yr database measured at the Burjassot site (Valencia, Spain), and compared the resultant products with the AERONET direct sun measurements obtained with the same CIMEL CE318 sky-sun photometer. The comparison shows that aerosol optical depth differences are mostly within the nominal uncertainty of 0.003 for a standard calibration instrument, and fall within the nominal AERONET uncertainty of 0.01-0.02 for a field instrument in the spectral range 340 to 1020 nm. In the cases of the Angstrom exponent and the columnar water vapor, the differences are lower than 0.02 and 0.15 cm, respectively. Therefore, we present an open source code program that can be used with both CIMEL and PREDE sky radiometers and whose results are equivalent to AERONET and SKYNET retrievals.