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Estimation of Upward Radiances and Reflectances at the Surface of the Sea from Above-surface Measurements : Volume 12, Issue 3 (12/06/2015)

By Kleiv, Ø.

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Book Id: WPLBN0004020852
Format Type: PDF Article :
File Size: Pages 32
Reproduction Date: 2015

Title: Estimation of Upward Radiances and Reflectances at the Surface of the Sea from Above-surface Measurements : Volume 12, Issue 3 (12/06/2015)  
Author: Kleiv, Ø.
Volume: Vol. 12, Issue 3
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2015
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Aas, E., Kleiv, Ø., Høkedal, J., Sørensen, K., & Folkestad, A. (2015). Estimation of Upward Radiances and Reflectances at the Surface of the Sea from Above-surface Measurements : Volume 12, Issue 3 (12/06/2015). Retrieved from http://www.worldlibrary.net/


Description
Description: Norwegian Institute for Water Research, Gaustadalleen 21, 0349 Oslo, Norway. During four field days in the years 2009–2011, 22 series of measurement were collected in the Inner Oslofjord. The data consist of recordings of spectral sub-surface and above-surface nadir radiances, as well as spectral downward irradiance in air. The studied wavelengths are 351, 400 nm and the 10 former MERIS channels in the range 413–754 nm. The water-leaving radiance and the reflected radiance at the sea surface can be determined from the measured nadir radiances in water and air. A simpler and much faster method, which determines the radiance reflectance at the surface as well as the water-leaving and reflected radiances solely from the measurements of upward nadir radiance and downward irradiance in air, is presented. A comparison between the quantities determined by the two methods shows that the average relative deviations between their results are less than or equal to 15% for the reflected radiance, at the studied wavelengths. The average relative deviations of the water-leaving radiance at 560 nm is 24%. We consider this to be acceptable uncertainties for a first check of satellite products in coastal waters.

Summary
Estimation of upward radiances and reflectances at the surface of the sea from above-surface measurements

Excerpt
Aas, E.: A simple method for radiance calibration, in: European Workshop on Optical Ground Truth Instrumentation for the Validation of Space-Borne Optical Remote Sensing Data of the Marine Environment, 23–25 November 1993, Netherlands Institute for Sea Research, Texel, the Netherlands, Rep. 1994-3, 39–44, 1994.; Aas, E.: Estimates of radiance reflected towards the zenith at the surface of the sea, Ocean Sci., 6, 861–876, doi:10.5194/os-6-861-2010, 2010.; Aas, E. and Korsbø, B.: Self-shading effect by radiance meters on upward radiance observed in coastal waters, Limnol. Oceanogr., 42, 968–974, 1997.; Aas, E., Høkedal, J., and Sørensen, K.: Spectral backscattering coefficient in coastal waters, Int. J. Remote Sens., 26, 331–343, 2005.; Aas, E., Høkedal, J., and Højerslev, N. K.: Conversion of sub-surface reflectances to above-surface MERIS reflectance, Int. J. Remote Sens., 30, 5767–5791, 2009.; Aas, E., Høkedal, J., and Sørensen, K.: Secchi depth in the Oslofjord–Skagerrak area: theory, experiments and relationships to other quantities, Ocean Sci., 10, 177–199, doi:10.5194/os-10-177-2014, 2014.; Doxaran, D., Nagur Cherukuru, R. C., and Lavender, S. J.: Estimation of surface reflection effects on upwelling radiance field measurements in turbid waters, J. Opt. A-Pure Appl. Op., 6, 690–697, 2004.; Gordon, H. R. and Ding, K.: Self-shading of in-water optical instruments, Limnol. Oceanogr., 37, 491–500, 1992.; Hooker, S. B. and Morel, A.: Platform and environmental effects on above-water determinations of water-leaving radiances, J. Atmos. Ocean. Tech., 20, 187–205, 2003.; Hooker, S. B. and Zibordi, G.: Platform perturbations in above-water radiometry, Appl. Optics, 44, 553–567, 2005.; Høkedal, J., Aas, E., and Sørensen, K.: Spectral optical and bio-optical relationships in the Oslo Fjord compared with similar results from the Baltic Sea, Int. J. Remote Sens., 26, 371–386, 2005.; Korsbø, B. and Aas, E.: Ship-shading effects on upward radiance and irradiance in coastal waters, Rep. Dept. Geophys., Univ. Oslo, Oslo, Norway, 101, 13 pp., 1997.; Kristiansen, T. and Aas, E.: Water type quantification in the Skagerrak, the Kattegat and off the Jutland west coast, Oceanologia, 57, 177–195, 2015.; Morel, A. and Gentili, B.: Diffuse reflection of oceanic waters. II. Bidirectional aspects, Appl. Optics, 35, 4850–4862, 1996.; Magnusson, J., Dahl, E., Karud, J., Sørensen, K., Willbergh, M., and Aas, E.: Validation of methods for monitoring of coastal and open sea areas with satellites and sensors on ships of opportunity, NIVA Report SNO 4710-2003, NIVA, Oslo, Norway, 2003.; Ohde, T. and Siegel, H.: Derivation of immersion factors for the hyperspectral TriOS radiance sensor, J. Opt. A-Pure Appl. Op., 5, L12–L14, doi:10.1088/1464-4258/5/3/103, 2003.; Peters, S. W. M., Eleveld, M., Pasterkamp, R., van der Woerd, H., Devolder, M., Jans, S., Park, Y., Ruddick, K., Block, T., Brockmann, C., Doerffer, R., Kraseman, H., Röttgers, R., Schönfeld, W., Jørgensen, P. V., Tilstone, G., Martinez-Vincente, V., Moore, G., Sørensen, K., Høkedal, J., Johnsen, T. M., Lømsland, E. R., and Aas, E.: Atlas of Chlorophyll-a concentration for the North Sea based on MERIS imagery of 2003, Vrije Universiteit, Amsterdam, the Netherlands, 121 pp., 2005a.; Peters, S., Brockmann, C., Eleveld, M., Pasterkamp, R., van der Woerd, H., Ruddick, K., Park, Y., Block, T., Doerffer, R., Krasemann, H., Roettgers, R., Schoenfeld, W., Joergensen, P., Tilstone, G., Martinez-Vicente, V., Moore, G., Soerensen, K., Hokedal, J., and Aas, E.: Regional chlorophyll retrieval algorithms for North Sea waters: intercomparison and validation. Proceedings of the MERIS (A)ATSR Workshop 2005 (ESA SP-597). 26–30 September 2005 ESRIN, Frascati, Italy, Edited by: Lacoste, H., Published on CDROM, p.19.1 Publica

 

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