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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
Publication Date:
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

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.

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

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