Variability in the Backscattering to Scattering and F/Q Ratios Observed in Natural Waters
Conference proceeding, 18-22 Nov 2002
NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEANOGRAPHY DIV
Pagination or Media Count:
Variability of the backscattering to scattering bbb and the upwelling irradianceupwelling radiance fQ ratios affect the accurate retrieval of inherent optical properties from ocean color satellite algorithms SeaWiFS and MODIS. We investigate the variability of bbb and the fQ in coastal and open-ocean surface waters of the Northern Gulf of Mexico and U.S. East Coast off New Jersey. In situ measurements of scattering b from an ac9 probe were collected with concurrent measurements of bb from a six channel Hydroscat sensor. We compare the measured bbb values with values derived from the Petzold Volume Scattering Functions Petzoldl4, examine the spectral variability of the ratio and examine the variability in different water types related to the changes in the Volume Scattering Function VSF. In addition, we estimate the TfQ Mobley9 term from above-water measurements of remote sensing reflectance Rrs coupled with direct measurements of absorption a and backscattering bb coefficients. We will examine the spectral dependence of the Tf7Q term and its relationship to the bbb ratio, which we use as a substitute for the changing VSF. Finally, we will show how the estimated TfQ values vary from the commonly used value of 0.051 used for satellite processing.
- Physical and Dynamic Oceanography