An inherent-optical-property-centered approach to correct the angular effects in water-leaving radiance

Remote sensing reflectance (Rrs), which is defined as the ratio of water-leaving radiance (Lw) to downwelling irradiance just above the surface (Ed(0+)), varies with both water constituents and angular geometry. Lw is commonly measured in the field or by satellite sensors at convenient angles, while Ed(0+) can be either measured in the field or estimated based on atmospheric properties. To isolate the variations of Rrs (or Lw) resulting from change of water constituents, the angular effects of Rrs (or Lw) need to be removed. This is also a necessity for the calibration and validation of satellite ocean color measurements. To reach this objective, we present a system centered on water¿s inherent optical properties (IOPs). It offers an alternative to the system centered on the concentration of chlorophyll, and is applicable to both Case-1 and Case-2 waters. This IOP-centered system is applied to both numerically simulated data and in situ measurements to test and evaluate its performance. The good results obtained suggest that the system can be applied to angular Rrs to retrieve IOPs and to remove the angular variation of Rrs.

LEE Zhongping;  VOSS Kenneth;  ZIBORDI Giuseppe;  LUBAC Berttrand;  ARNONE Robert;  WEIDEMANN Alan; 

2011-06-30

OPTICAL SOC AMER

JRC62925

0003-6935,   

http://www.opticsinfobase.org/ao/abstract.cfm?uri=ao-50-19-3155,    https://publications.jrc.ec.europa.eu/repository/handle/JRC62925,   

10.1364/AO.50.003155,