Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.5194/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
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ISSN | 1867-1381 |
EISSN | 1867-8548 |
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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