UC Santa Cruz
Evaluation of satellite retrievals of ocean chlorophyll-a in the california current
- Author(s): Kahru, M
- Kudela, RM
- Anderson, CR
- Manzano-Sarabia, M
- Mitchell, BG
- et al.
Published Web Locationhttps://doi.org/10.3390/rs6098524
© 2014 by the authors. 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 m-3, only products from MERIS (both the ESA produced algal_1 and NASA produced chlor_a) maintained reasonable accuracy (R2from 0.74 to 0.52 and MdAPE from 23% to 31%, respectively), while the other sensors had R2below 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.
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