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SeaWiFS technical report series. Volume 26: Results of the SeaWiFS Data Analysis Round-Robin, July 1994 (DARR-1994)The accurate determination of upper ocean apparent optical properties (AOP's) is essential for the vicarious calibration of the sea-viewing wide field-of-view sensor (SeaWiFS) instrument and the validation of the derived data products. To evaluate the role that data analysis methods have upon values of derived AOP's, the first Data Analysis Round-Robin (DARR-94) workshop was sponsored by the SeaWiFS Project during 21-23 July, 1994. The focus of this intercomparison study was the estimation of the downwelling irradiance spectrum just beneath the sea surface, E(sub d)(0(sup -), lambda); the upwelling nadir radiance just beneath the sea surface, L(sub u)(0(sup -), lambda); and the vertical profile of the diffuse attenuation coefficient spectrum, K(sub d)(z, lambda). In the results reported here, different methodologies from four research groups were applied to an identical set of 10 spectroradiometry casts in order to evaluate the degree to which data analysis methods influence AOP estimation, and whether any general improvements can be made. The overall results of DARR-94 are presented in Chapter 1 and the individual methods of the four groups are presented in Chapters 2-5. The DARR-94 results do not show a clear winner among data analysis methods evaluated. It is apparent, however, that some degree of outlier rejection is required in order to accurately estimate L(sub u)(0(sup -), lambda) or E(sub d)(0(sup -), lambda). Furthermore, the calculation, evaluation and exploitation of confidence intervals for the AOP determinations needs to be explored. That is, the SeaWiFS calibration and validation problem should be recast in statistical terms where the in situ AOP values are statistical estimates with known confidence intervals.
Document ID
19950020010
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Hooker, Stanford B. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Firestone, Elaine R. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Siegel, David A. (California Univ. Santa Barbara, CA., United States)
Obrien, Margaret C. (California Univ. Santa Barbara, CA., United States)
Sorensen, Jen C. (California Univ. Santa Barbara, CA., United States)
Konnoff, Daniel A. (California Univ. Santa Barbara, CA., United States)
Brody, Eric A. (California Univ. Santa Barbara, CA., United States)
Mueller, James L. (San Diego State Univ. San Diego, CA., United States)
Davis, Curtiss O. (Naval Research Advisory Committee Washington, DC., United States)
Rhea, W. Joseph (Naval Research Advisory Committee Washington, DC., United States)
Date Acquired
September 6, 2013
Publication Date
February 1, 1995
Subject Category
Oceanography
Report/Patent Number
NAS 1.15:104566-VOL-26
REPT-95B00081-VOL-26
NASA-TM-104566-VOL-26
Accession Number
95N26430
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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