Ocean Color Chlorophyll Algorithms for SEAWIFS
John E. O'Reilly,Stéphane Maritorena,B. Greg Mitchell,David A. Siegel,Kendall L. Carder,Sara A. Garver,Mati Kahru,Charles R. McClain +7 more
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TLDR
In this article, a large data set containing coincident in situ chlorophyll and remote sensing reflectance measurements was used to evaluate the accuracy, precision, and suitability of a wide variety of ocean color algorithms for use by SeaWiFS (Sea-viewing Wide Field-of-view Sensor).Abstract:
A large data set containing coincident in situ chlorophyll and remote sensing reflectance measurements was used to evaluate the accuracy, precision, and suitability of a wide variety of ocean color chlorophyll algorithms for use by SeaWiFS (Sea-viewing Wide Field-of-view Sensor). The radiance-chlorophyll data were assembled from various sources during the SeaWiFS Bio-optical Algorithm Mini-Workshop (SeaBAM) and is composed of 919 stations encompassing chlorophyll concentrations between 0.019 and 32.79 μg L−1. Most of the observations are from Case I nonpolar waters, and ∼20 observations are from more turbid coastal waters. A variety of statistical and graphical criteria were used to evaluate the performances of 2 semianalytic and 15 empirical chlorophyll/pigment algorithms subjected to the SeaBAM data. The empirical algorithms generally performed better than the semianalytic. Cubic polynomial formulations were generally superior to other kinds of equations. Empirical algorithms with increasing complexity (number of coefficients and wavebands), were calibrated to the SeaBAM data, and evaluated to illustrate the relative merits of different formulations. The ocean chlorophyll 2 algorithm (OC2), a modified cubic polynomial (MCP) function which uses Rrs490/Rrs555, well simulates the sigmoidal pattern evident between log-transformed radiance ratios and chlorophyll, and has been chosen as the at-launch SeaWiFS operational chlorophyll a algorithm. Improved performance was obtained using the ocean chlorophyll 4 algorithm (OC4), a four-band (443, 490, 510, 555 nm), maximum band ratio formulation. This maximum band ratio (MBR) is a new approach in empirical ocean color algorithms and has the potential advantage of maintaining the highest possible satellite sensor signal: noise ratio over a 3-orders-of-magnitude range in chlorophyll concentration.read more
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Absorption and Backscattering in the Beaufort and Chukchi Seas
TL;DR: In this article, the chlorophyll-specific absorption of phytoplankton was nearly constant at 0.013 m2 (mg chl)−1, but particulate absorption due to nonpigmented particulates at 443 nm was highly variable.
Journal ArticleDOI
Interpreting the progressive eutrophication behind the world's largest macroalgal blooms with water quality and ocean color data
TL;DR: In this paper, the authors used an area-weighted nutrient pollution index (AWCPI-NP) and ocean color data to assess temporal changes in eutrophication status in the Yellow Sea basin.
Journal ArticleDOI
SeaWiFS sensing of hazardous algal blooms and their underlying mechanisms in shelf-slope waters of the Northwest Pacific during summer
TL;DR: In this paper, the authors describe the occurrence of various hazardous algal blooms (HABs) and their underlying mechanisms and link to nutrient enrichment during the summer (June-September) in shelf-slope waters off the Northwest Pacific (NWP) covering China, Korea, Japan and Russia.
Journal ArticleDOI
Phytoplankton pigment distribution in the northwestern Alboran Sea and meteorological forcing: A remote sensing study
TL;DR: In this paper, a set of weekly-composite SeaWiFS (Sea-viewing Wide Field of view Sensor) imagery was used to asses the temporal and spatial variability of the surface chlorophyll distribution in the Northwestern Alboran Sea.
Journal ArticleDOI
Satellite Detection of Red Tide in Ariake Sound, 1998-2001
Joji Ishizaka,Yasuhisa Kitaura,Yasuharu Touke,Hiroaki Sasaki,Akihiko Tanaka,Hiroshi Murakami,Toshikazu Suzuki,Kazumi Matsuoka,Hideaki Nakata +8 more
TL;DR: In this paper, high resolution SeaWiFS data was used to detect red tide events that occurred in the Ariake Sound, Japan, a small embayment known as one of the most productive areas in Japan Sea WiFS chlorophyll data clearly showed that a large red tide event, which damaged seaweed cultures, started early in December 2000 in Isahaya Bay, expanded to the whole sound and persisted to the end of February 2001.
References
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