Merged multi-sensor ocean colour chlorophyll product evaluation for the British Columbia coast
Date
2023
Authors
Pramlall, Sejal
Jackson, Jennifer M.
Konik, Marta
Costa, Maycira
Journal Title
Journal ISSN
Volume Title
Publisher
Remote Sensing
Abstract
Phytoplankton phenology studies require a dataset that is continuous in time and space
since missing data have been shown to affect the accuracy of seasonality metrics. The interpolated
GlobColour product provided by the Copernicus Marine Environment Monitoring Service (CMEMS)
meets these requirements by being ‘gap filled’, thus yielding the highest spatial coverage. Despite
being validated on a global scale, a regional comparison to in situ Chl-a concentrations should be
conducted to enable product application in optically complex waters. This study aims to evaluate
the performance of the GlobColour interpolated product in British Columbia coastal waters via a
statistical match-up analysis and a qualitative analysis to determine whether the data reflect the
region’s large-scale seasonal trends and latitudinal dynamics. Additionally, the statistical performance
of the GlobColour interpolated product was compared to the original GlobColour and Ocean Colour
Climate Change Initiative (OC-CCI) merged chlorophyll-a products based on in situ observations.
The GlobColour interpolated product performed relatively well and was comparable to the best-performing
product for each water type (RMSE = 0.28, r2 = 0.77, MdAD = 1.5, BIAS = 0.90). The
statistics for all the products degraded in Case 2 waters, thus highlighting the dilemma of applying
algorithms designed for Case 1 waters in Case 2 waters. Our results indicate how the quality of
products can vary in different environmental conditions.
Description
Keywords
GlobColour, OC-CCI, chlorophyll-a, match-up, merged products
Citation
Pramlall, S., Jackson, J. M., Konik, M., & Costa, M. (2023). “Merged multi-sensor ocean colour chlorophyll product evaluation for the British Columbia coast.” Remote Sensing, 15(3), 687. https://doi.org/10.3390/rs15030687