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Development of a New Data-processing Method for Skynet Sky Radiometer Observations : Volume 5, Issue 11 (15/11/2012)

By Hashimoto, M.

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Book Id: WPLBN0003992035
Format Type: PDF Article :
File Size: Pages 15
Reproduction Date: 2015

Title: Development of a New Data-processing Method for Skynet Sky Radiometer Observations : Volume 5, Issue 11 (15/11/2012)  
Author: Hashimoto, M.
Volume: Vol. 5, Issue 11
Language: English
Subject: Science, Atmospheric, Measurement
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2012
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Takamura, T., Hashimoto, M., Che, H., Campanelli, M., Khatri, P., Nakajima, T.,...Pandithurai, G. (2012). Development of a New Data-processing Method for Skynet Sky Radiometer Observations : Volume 5, Issue 11 (15/11/2012). Retrieved from http://www.ebooklibrary.org/


Description
Description: Atmosphere and Ocean Research Institute (AORI), University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8568, Japan. In order to reduce uncertainty in the estimation of Direct Aerosol Radiative Forcing (DARF), it is important to improve the estimation of the single scattering albedo (SSA). In this study, we propose a new data processing method to improve SSA retrievals for the SKYNET sky radiometer network, which is one of the growing number of networks of sun-sky photometers, such as NASA AERONET and others. There are several reports that SSA values from SKYNET have a bias compared to those from AERONET, which is regarded to be the most accurate due to its rigorous calibration routines and data quality and cloud screening algorithms. We investigated possible causes of errors in SSA that might explain the known biases through sensitivity experiments using a numerical model, and also using real data at the SKYNET sites at Pune (18.616° N/73.800° E) in India and Beijing (39.586° N/116.229° E) in China. Sensitivity experiments showed that an uncertainty of the order of ±0.03 in the SSA value can be caused by a possible error in the ground surface albedo or solid view angle assumed for each observation site. Another candidate for possible error in the SSA was found in cirrus contamination generated by imperfect cloud screening in the SKYNET data processing. Therefore, we developed a new data quality control method to get rid of low quality or cloud contamination data, and we applied this method to the real observation data at the Pune site in SKYNET. After applying this method to the observation data, we were able to screen out a large amount of cirrus-contaminated data and to reduce the deviation in the SSA value from that of AERONET. We then estimated DARF using data screened by our new method. The result showed that the method significantly reduced the difference of 5 W m−2 that existed between the SKYNET and AERONET values of DARF before screening. The present study also suggests the necessity of preparing suitable a priori information on the distribution of coarse particles ranging in radius between 10 μm and 30 μm for the analysis of heavily dust-laden atmospheric cases.

Summary
Development of a new data-processing method for SKYNET sky radiometer observations

Excerpt
Badarinath, K. V. S., Goto, D., Kharol, S. K., Mahalakshmi, D. V., Sharma, A. R., Nakajima, T., Hashimoto, M., and Takemura, T.: Influence of natural and anthropogenic emissions on aerosol optical proper ties over tropical urban site – a study using sky radiometer and satellite data, Atmos. Res., 100, 111–120, doi:10.1016/j.atmosres.2011.01.003, 2011.; Campanelli, M., Nakajima, T., and Olivieri, B.: Determination of the solar calibration constant a sun-sky radiometer: Proposal of an in-situ procedure, Appl. Optics., 43, 651–659, 2004.; Campanelli, M., Estellés, V., Tomasi, C., Nakajima, T., Malvestuto, V., and Martinez-Lozano, J. A.: Application of the SKYRAD improved Langley plot method for the in situ calibration of CIMEL sun-sky photometers, Appl. Optics, 46, 2688–2702, 2007.; Campanelli, M., Lupi, A., Nakajima, T., Malvestuto, V., Tomasi, C., and Estelles, V.: Summertime columnar content of atmospheric water vapor from ground-based Sun-sky radiometer measurements through a new in situ procedure, J. Geophys. Res., 115, D19304, doi:10.1029/2009JD013211, 2010.; Chandrasekhar, S.: Radiative Transfer, New York, Dover, 1960.; Hess, M., Koepke, P., and Suhult, I.: Optical Properties of Aerosols and Clouds: The Software Package OPAC, B. Am. Meteorol. Soc., 79, 831–844, 1998.; Che, H., Shi, G., Uchiyama, A., Yamazaki, A., Chen, H., Goloub, P., and Zhang, X.: Intercomparison between aerosol optical properties by a PREDE skyradiometer and CIMEL sunphotometer over Beijing, China, Atmos. Chem. Phys., 8, 3199–3214, doi:10.5194/acp-8-3199-2008, 2008.; Chepil, W. S.: Sedimentary characteristics of dust storms: III. Composition of suspended dust, Am. J. Sci., 255, 206–213, 1957.; Deepak, A. and Gerber, H. E. (Eds.): Report of the Experts Meeting on Aerosols and Their Climatic Effects, Williamsburg, Virginia, 28–30 March 1983: WMO-ICSU WCP-55, World Meteorology Organization, Geneva, Switzerland, 107 pp., 1983.; Dubovik, O.: Optimization of Numerical Inversion in Photopolarimetric Remote Sensing, in: Photopolarimetry in Remote Sensing, edited by: Videen, G., Yatskiv, Y., and Mishchenko, M., Kluwer Academic Publishers, Dordrecht, Netherlands, 65–106, 2004.; Dubovik, O. and King, M. D.: A flexible inversion algorithm for retrieval of aerosol optical properties from Sun and sky radianve measurements, J. Geophys. Res., 105, 20673–20696, 2000; Dubovik, O., Smirnov, A., Holben, B., King, M. D., Kaufman, Y. J., Eck, T. F., and Slutsker, I.: Accuracy assessment of aerosol optical properties retrieval from Aerosol Robotic Network (AERONET) Sun and sky radiance measurements, J. Geophys. Res., 105, 9791–9806, 2000.; Dubovik, O., Holben, B., Eck, T. F., Smirnov, A., Kaufman, Y. J., King, M. D., Tanré, D., and Slutsker, I.: Variability of absorption and optical properties of key aerosol types observed in worldwide locations, J. Atmos. Sci., 59, 590–608, 2002.; Dubovik, O., Sinyuk, A., Lapyonok, T., Holben, B., Mishchenko, M., Yang, P., Eck, T. F., Volten, H., Munoz, O., Veihelmann, B., van der Zander, W. J., Sorokin, M., and Slutsker, I.: Application of light scattering by spheroids for accounting for particle non sphericity in remote sensing of desert dust, J. Geophys. Res., 111, D11208, doi:10.1029/2005JD006619, 2006.; Dubovik, O., Herman, M., Holdak, A., Lapyonok, T., Tanré, D., Deuzé, J. L., Ducos, F., Sinyuk, A., and Lopatin, A.: Statistically optimized inversion algorithm for enhanced retrieval of aerosol properties from spectral multi-angle polarimetric satellite observations, Atmos. Meas. Tech., 4, 975–1018, doi:10.5194/amt-4-975-2011, 2011.; Feng, Y. C., Xue, Y. H., Chen, X. H., Wu, J. H., Zhu

 

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