FN Archimer Export Format
PT J
TI Detection of Coccolithophore Blooms With BioGeoChemical‐Argo Floats
BT 
AF Terrats, L.
   Claustre, H.
   Cornec, M.
   Mangin, A.
   Neukermans, G.
AS 1:1,2;2:1;3:1;4:2;5:3,4;
FF 1:;2:;3:;4:;5:;
C1 Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche, LOV Villefranche‐sur‐Mer, France
   ACRI‐ST Sophia Antipolis, France
   Biology Department, MarSens Research Group Ghent University Ghent ,Belgium
   Flanders Marine Institute (VLIZ), InnovOcean site Ostend ,Belgium
C2 UNIV SORBONNE, FRANCE
   ACRI‐ST, FRANCE
   UNIV GHENT, BELGIUM
   FLANDERS MARINE INSTITUTE (VLIZ), BELGIUM
IF 4.72
TC 20
UR https://archimer.ifremer.fr/doc/00660/77209/78652.pdf
   https://archimer.ifremer.fr/doc/00660/77209/78653.docx
LA English
DT Article
DE ;coccolithophores;Emiliania huxleyi;bloom detection;BGC-Argo floats;bio-optics;global ocean
AB Coccolithophores (calcifying phytoplankton) form extensive blooms in temperate and subpolar oceans as evidenced from ocean‐color satellites. This study examines the potential to detect coccolithophore blooms with BioGeoChemical‐Argo (BGC‐Argo) floats, autonomous ocean profilers equipped with bio‐optical and physicochemical sensors. We first matched float data to ocean‐color satellite data of calcite concentration to select floats that sampled coccolithophore blooms. We identified two floats in the Southern Ocean, which measured the particulate beam attenuation coefficient (cp) in addition to two core BGC‐Argo variables, Chlorophyll‐a concentration ([Chl‐a]) and the particle backscattering coefficient (bbp). We show that coccolithophore blooms can be identified from floats by distinctively high values of (1) the bbp/cp ratio, a proxy for the refractive index of suspended particles, and (2) the bbp/[Chl‐a] ratio, measurable by any BGC‐Argo float. The latter thus paves the way to global investigations of environmental control of coccolithophore blooms and their role in carbon export. Plain Language Summary Coccolithophores are a group of phytoplankton that form an armor of calcite plates. Coccolithophores may form intense blooms which can be identified from space by so‐called ocean‐color satellites, providing global images of the color of the surface ocean. BioGeoChemical‐Argo (BGC‐Argo) floats, robots profiling down to 2,000 m with a variety of physicochemical and bio‐optical sensors, present an increasingly attractive and cost‐effective platform to study phytoplankton blooms and their impact on oceanic biogeochemical cycles. We show that coccolithophore blooms can be detected by BGC‐Argo floats with high confidence, hence providing a new way to study them at the global scale as well as their role in sinking carbon. 
PY 2020
PD NOV
SO Geophysical Research Letters
SN 0094-8276
PU American Geophysical Union (AGU)
VL 47
IS 23
UT 000598677000013
DI 10.1029/2020GL090559
ID 77209
ER

EF