A model for remote estimation of ultraviolet absorption by chromophoric dissolved organic matter based on the global distribution of spectral slope

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Author(s) Swan, Chantal M., Nelson, Norman B., Siegel, David A., Fields, Erik A.
Publication Type Journal Items, Publication Status: Published
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Title A model for remote estimation of ultraviolet absorption by chromophoric dissolved organic matter based on the global distribution of spectral slope
Author(s) Swan, Chantal M.
Nelson, Norman B.
Siegel, David A.
Fields, Erik A.
Journal or Series Title Remote sensing of environment
Volume Number 136
Start Page 277
End Page 285
ISSN 0034-4257
Publisher Elsevier
Publication Place New York
Publication Date 2013-09
Keyword(s) CDOM
UV
Absorption
Ocean color
Spectral slope
S
GSM
Remote sensing
Abstract Absorption of ultraviolet radiation (UV, 280–400 nm) by chromophoric dissolved organic matter (CDOM) precedes a host of light-sensitized surface ocean processes relevant to global climate. These include photo- and biogeochemical cycling of organic material, release of sulfur and carbon-containing gases to the atmo- sphere, and the photoprotection of marine microorganisms. Synoptic CDOM absorption data in the UV is highly desired yet difficult to estimate by satellite methods as the atmosphere interferes with direct detection of water-leaving UV radiance. The absorption spectrum of CDOM is typically modeled as an exponential func- tion in which a spectral slope parameter, S, describes the rate of decrease in absorption with increase in wavelength. Significant functional relationships are observed in aquatic environments between S and the CDOM absorption coefficient at 443 nm, aCDOM(443). In this paper, we use a large, systematic dataset of spec- troscopic CDOM measurements from the U.S. CO2/CLIVAR Repeat Hydrography Survey to examine the rela- tionship between S and aCDOM(443) as a means to model aCDOM(λ) in the UV from ocean color. Our resultant model predicts aCDOM(λ) at wavelengths from 325 to 412 nm from the absorption coefficient of col- ored dissolved and detrital materials (CDM) at 443 nm, aCDM(443), retrieved by an existing semi-analytical ocean color algorithm. Expected agreement (near 1:1) with the training dataset was achieved (r2 = 0.71– 0.85, p = 0, n = 127). Considering inherent satellite data uncertainties as well as the model's limitations in regions with potential terrestrial influence, good correspondence between modeled and in situ values was observed during independent validation with open ocean CDOM data, such as from BIOSOPE (r2 = 0.77–0.85, p b 0.05, n = 29). The model has immediate application in global scale assessments of photo- chemical rate processes and CDOM cycling in the open ocean due to its simplicity and optimization using a large base of field data (>7500 samples) from diverse Case I waters.
DOI 10.1016/j.rse.2013.05.009
Additional Notes Received 14 January 2012, Received in revised form 30 April 2013, Accepted 1 May 2013, Available online 5 June 2013
Document Type Article
Publication Status Published
Language English
Assigned Organisational Unit(s) 03731
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NEBIS System Number 000053663
Source Database ID FORM-1383660746
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@article{Swn2013,
  author = "Swan, Chantal M. and Nelson, Norman B. and Siegel, David A. and Fields, Erik A.",
  title = "{A} model for remote estimation of ultraviolet absorption by chromophoric dissolved organic matter based on the global distribution of spectral slope",
  journal = "Remote sensing of environment",
  year = 2013,
  volume = "136",
  pages = "277--285",
  month = sep,
}


E-Citations record created: Tue, 05 Nov 2013, 14:12:30 CET