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Open AccessArticle

Evaluation of Satellite Retrievals of Ocean Chlorophyll-a in the California Current

1
Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA 95064, USA
2
Ocean Sciences Department, University of California Santa Cruz, Santa Cruz, CA 95064, USA
3
Facultad de Ciencias del Mar, Universidad Autónoma de Sinaloa, Mazatlán, Sinaloa, Mexico
*
Author to whom correspondence should be addressed.
Remote Sens. 2014, 6(9), 8524-8540; https://doi.org/10.3390/rs6098524
Received: 14 July 2014 / Revised: 28 August 2014 / Accepted: 3 September 2014 / Published: 11 September 2014
(This article belongs to the Special Issue Remote Sensing of Phytoplankton)
Retrievals of ocean surface chlorophyll-a concentration (Chla) by multiple ocean color satellite sensors (SeaWiFS, MODIS-Terra, MODIS-Aqua, MERIS, VIIRS) using standard algorithms were evaluated in the California Current using a large archive of in situ measurements. Over the full range of in situ Chla, all sensors produced a coefficient of determination (R2) between 0.79 and 0.88 and a median absolute percent error (MdAPE) between 21% and 27%. However, at in situ Chla > 1 mg m3, only products from MERIS (both the ESA produced algal_1 and NASA produced chlor_a) maintained reasonable accuracy (R2 from 0.74 to 0.52 and MdAPE from 23% to 31%, respectively), while the other sensors had R2 below 0.5 and MdAPE higher than 36%. We show that the low accuracy at medium and high Chla is caused by the poor retrieval of remote sensing reflectance. View Full-Text
Keywords: ocean color; phytoplankton; chlorophyll; California Current; remote sensing ocean color; phytoplankton; chlorophyll; California Current; remote sensing
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Kahru, M.; Kudela, R.M.; Anderson, C.R.; Manzano-Sarabia, M.; Mitchell, B.G. Evaluation of Satellite Retrievals of Ocean Chlorophyll-a in the California Current. Remote Sens. 2014, 6, 8524-8540.

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