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Article
Diffuse Attenuation Coefficient of Downwelling Irradiance: An Evaluation of Remote Sensing Methods
Journal of Geophysical Research - Oceans
  • ZhongPing Lee, Ocean University of China
  • Miroslaw Darecki, Polish Academy of Sciences
  • Kendall L. Carder, University of South Florida
  • Curtiss O. Davis, Naval Research Laboratory, Washington DC
  • Dariusz Stramski, University of California - San Diego
  • W. Joseph Rhea, Naval Research Laboratory, Washington DC
Document Type
Article
Publication Date
2-22-2005
Keywords
  • diffuse attenuation coefficient,
  • remote sensing,
  • empirical algorithm,
  • semianalytical algorithm
Digital Object Identifier (DOI)
https://doi.org/10.1029/2004JC002573
Disciplines
Abstract

[1] The propagation of downwelling irradiance at wavelength λ from surface to a depth (z) in the ocean is governed by the diffuse attenuation coefficient. There are two standard methods for the derivation of in remote sensing, which both are based on empirical relationships involving the blue‐to‐green ratio of ocean color. Recently, a semianalytical method to derive from reflectance has also been developed. In this study, using (490) and (443) as examples, we compare the values derived from the three methods using data collected in three different regions that cover oceanic and coastal waters, with (490) ranging from 0.04 to 4.0 m. The derived values are compared with the data calculated from in situ measurements of the vertical profiles of downwelling irradiance. The comparisons show that the two standard methods produced satisfactory estimates of in oceanic waters where attenuation is relatively low but resulted in significant errors in coastal waters. The newly developed semianalytical method appears to have no such limitation as it performed well for both oceanic and coastal waters. For all data in this study the average of absolute percentage difference between the in situ measured and the semianalytically derived is 14% for = 490 nm and 11% for = 443 nm.

Citation / Publisher Attribution

Journal of Geophysical Research - Oceans, v. 110, no. C2, article C02017.

Citation Information
ZhongPing Lee, Miroslaw Darecki, Kendall L. Carder, Curtiss O. Davis, et al.. "Diffuse Attenuation Coefficient of Downwelling Irradiance: An Evaluation of Remote Sensing Methods" Journal of Geophysical Research - Oceans Vol. 110 Iss. C2 (2005)
Available at: http://works.bepress.com/kendall_carder/3/