Arid
DOI10.5194/amt-6-2207-2013
Measurements on pointing error and field of view of Cimel-318 Sun photometers in the scope of AERONET
Torres, B.1,2; Toledano, C.1; Berjon, A.3; Fuertes, D.1; Molina, V.1; Gonzalez, R.1; Canini, M.4; Cachorro, V. E.1; Goloub, P.2; Podvin, T.2; Blarel, L.2; Dubovik, O.2; Bennouna, Y.1; de Frutos, A. M.1
通讯作者Torres, B.
来源期刊ATMOSPHERIC MEASUREMENT TECHNIQUES
ISSN1867-1381
EISSN1867-8548
出版年2013
卷号6期号:8页码:2207-2220
英文摘要

Sensitivity studies indicate that among the diverse error sources of ground-based sky radiometer observations, the pointing error plays an important role in the correct retrieval of aerosol properties. The accurate pointing is specially critical for the characterization of desert dust aerosol. The present work relies on the analysis of two new measurement procedures (cross and matrix) specifically designed for the evaluation of the pointing error in the standard instrument of the Aerosol Robotic Network (AERONET), the Cimel CE-318 Sun photometer. The first part of the analysis contains a preliminary study whose results conclude on the need of a Sun movement correction for an accurate evaluation of the pointing error from both new measurements. Once this correction is applied, both measurements show equivalent results with differences under 0.01 degrees in the pointing error estimations. The second part of the analysis includes the incorporation of the cross procedure in the AERONET routine measurement protocol in order to monitor the pointing error in field instruments. The pointing error was evaluated using the data collected for more than a year, in 7 Sun photometers belonging to AERONET sites. The registered pointing error values were generally smaller than 0 1 degrees, though in some instruments values up to 0.3 degrees have been observed. Moreover, the pointing error analysis shows that this measurement can be useful to detect mechanical problems in the robots or dirtiness in the 4-quadrant detector used to track the Sun. Specifically, these mechanical faults can be detected due to the stable behavior of the values over time and vs. the solar zenith angle Finally, the matrix procedure can be used to derive the value of the solid view angle of the instruments. The methodology has been implemented and applied for the characterization of 5 Sun photometers. To validate the method, a comparison with solid angles obtained from the vicarious calibration method was developed. The differences between both techniques are below 3 %.


类型Article
语种英语
国家Spain ; France
收录类别SCI-E
WOS记录号WOS:000323978000024
WOS关键词SKY RADIANCE MEASUREMENTS ; AEROSOL OPTICAL-PROPERTIES ; ALGORITHM ; RETRIEVAL ; NETWORK
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/176026
作者单位1.Univ Valladolid, Grp Atmospher Opt, Valladolid, Spain;
2.Univ Sci & Technol Lille, Opt Atmospher Lab, UMR8518, Villeneuve Dascq, France;
3.Spanish Meteorol Agcy, Izana Atmospher Res Ctr, Tenerife, Spain;
4.CIMEL Elect, Paris, France
推荐引用方式
GB/T 7714
Torres, B.,Toledano, C.,Berjon, A.,et al. Measurements on pointing error and field of view of Cimel-318 Sun photometers in the scope of AERONET[J],2013,6(8):2207-2220.
APA Torres, B..,Toledano, C..,Berjon, A..,Fuertes, D..,Molina, V..,...&de Frutos, A. M..(2013).Measurements on pointing error and field of view of Cimel-318 Sun photometers in the scope of AERONET.ATMOSPHERIC MEASUREMENT TECHNIQUES,6(8),2207-2220.
MLA Torres, B.,et al."Measurements on pointing error and field of view of Cimel-318 Sun photometers in the scope of AERONET".ATMOSPHERIC MEASUREMENT TECHNIQUES 6.8(2013):2207-2220.
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