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Revisiting Ocean Color algorithms for chlorophyll a and particulate organic carbon in the Southern Ocean using biogeochemical floats

TitleRevisiting Ocean Color algorithms for chlorophyll a and particulate organic carbon in the Southern Ocean using biogeochemical floats
Publication TypeJournal Article
Year of Publication2017
AuthorsHaentjens N., Boss E., Talley LD
JournalJournal of Geophysical Research-Oceans
Volume122
Pagination6583-6593
Date Published2017/08
Type of ArticleArticle
ISBN Number2169-9275
Accession NumberWOS:000410790600031
Keywordselephant seals; fluorescence; optical-properties; space; validation
Abstract

The Southern Ocean (SO) ecosystem plays a key role in the carbon cycle by sinking a major part (43%) of the ocean uptake of anthropogenic CO2, and being an important source of nutrients for primary producers. However, undersampling of SO biogeochemical properties limits our understanding of the mechanisms taking place in this remote area. The Southern Ocean Carbon and Climate Observations and Modeling (SOCCOM) project has been deploying a large number of autonomous biogeochemical floats to study the SO (as of December 2016, 74 floats out of 200 have been deployed). SOCCOM floats measurements can be used to extend remote sensing chlorophyll a (chl a) and particulate organic carbon (POC) products under clouds or during the polar night as well as adding the depth dimension to the satellite-based view of the SO. Chlorophyll a concentrations measured by a sensor embedded on the floats and POC concentrations derived from backscattering coefficients were calibrated with samples collected during the floats' deployment cruise. Float chl a and POC were compared with products derived from observations of MODIS and VIIRS sensors. We find the Ocean Color Index (OCI) global algorithm to agree well with the matchups (within 9%, on average, for the Visible Infrared Imaging Radiometer Suite (VIIRS) and 12%, on average, for the Moderate Resolution Imaging Spectroradiometer Aqua (MODIS)). SO-specific algorithms estimating chl a are offset by similar to 45% south of the Sea Ice Extent Front (similar to 60 degrees S). In addition, POC estimates based on floats agree well with NASA's POC algorithm.

DOI10.1002/2017jc012844
Short TitleJ Geophys Res-Oceans
Student Publication: 
No