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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Space-time variability of carbon standing stocks and fixation rates in the Gulf of Maine, along the GNATS transect between Portland, ME, USA, and Yarmouth, Nova Scotia, Canada
William M. Balch,David T. Drapeau,Bruce C. Bowler,E. S. Booth,Laura A. Windecker,Amanda Ashe +5 more
TL;DR: The Gulf of Maine North Atlantic Time Series has been run since 1998 and is the longest transect time series in the United States, and it has been used to document the space-time variability of hydrography, nutrients, phytoplankton standing stocks and carbon fixation in the GoM, in response to several years of extreme river discharge.
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A ribbon of dark water: phytoplankton blooms in the meanders of the Pacific North Equatorial Countercurrent
TL;DR: In the far southwestern corner of the North Pacific Ocean, the Mindanao Current retroflects and flows northeast into the nascent North Equatorial Countercurrent (NECC), and Ocean-color images show that phytoplankton blooms occur both in the nearly closed cyclonic loop of the retroflection, and in the meandering NECC, which were particularly strong during the El Nino event of 1997-98.
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Ocean sand ridge signatures in the Bohai Sea observed by satellite ocean color and synthetic aperture radar measurements
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Journal ArticleDOI
Development of a consistent multi-sensor global ocean colour time series
Robert A. Barnes,Robert A. Barnes,Dennis K. Clark,Wayne E. Esaias,Giulietta S. Fargion,Giulietta S. Fargion,Gene C. Feldman,Charles R. McClain +7 more
TL;DR: The Sensor Intercomparison and Merger for Biological and Interdisciplinary Oceanic Studies (SIMBIOS) Project has been tasked to develop the tools required to create this time series as mentioned in this paper.
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CCE1: Decrease in the frequency of oceanic fronts and surface chlorophyll concentration in the California Current System during the 2014–2016 northeast Pacific warm anomalies
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References
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