FN Archimer Export Format
PT J
TI Shifts in Phytoplankton Community Structure Across an Anticyclonic Eddy Revealed From High Spectral Resolution Lidar Scattering Measurements
BT 
AF Schulien, Jennifer A.
   Della Penna, Alice
   Gaube, Peter
   Chase, Alison P.
   Haëntjens, Nils
   Graff, Jason R.
   Hair, Johnathan W.
   Hostetler, Chris A.
   Scarino, Amy Jo
   Boss, Emmanuel S.
   Karp-Boss, Lee
   Behrenfeld, Michael J.
AS 1:1;2:2,3;3:2;4:4;5:4;6:5;7:6;8:6;9:6;10:4;11:4;12:5;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;
C1 U.S. Geological Survey Western Ecological Research Center, Santa Cruz, CA, United States
   Air-Sea Interaction and Remote Sensing Department, Applied Physics Laboratory, University of Washington, Seattle, WA, United States
   Laboratoire des Sciences de l’Environnement Marin, UMR 6539 CNRS-Ifremer-IRD-UBO-Institut Universitaire Européen de la Mer, Plouzané, France
   School of Marine Sciences, University of Maine, Orono, ME, United States
   Department of Botany and Plant Pathology, Oregon State University, Corvallis, OR, United States
   NASA Langley Research Center, Hampton, VA, United States
C2 US GEOL SURVEY, USA
   UNIV WASHINGTON, USA
   UBO, FRANCE
   UNIV MAINE US, USA
   UNIV OREGON STATE, USA
   NASA, USA
UM LEMAR
IN WOS Cotutelle UMR
   DOAJ
   copubli-int-hors-europe
IF 5.247
TC 14
UR https://archimer.ifremer.fr/doc/00641/75313/75809.pdf
LA English
DT Article
DE ;HSRL;depolarization;backscatter;phytoplankton community composition;eddy
AB Changes in airborne high spectral resolution lidar (HSRL) measurements of scattering, depolarization, and attenuation coincided with a shift in phytoplankton community composition across an anticyclonic eddy in the North Atlantic. We normalized the total depolarization ratio (δ) by the particulate backscattering coefficient (bbp) to account for the covariance in δ and bbp that has been attributed to multiple scattering. A 15% increase in δ/bbp inside the eddy coincided with decreased phytoplankton biomass and a shift to smaller and more elongated phytoplankton cells. Taxonomic changes (reduced dinoflagellate relative abundance inside the eddy) were also observed. The δ signal is thus potentially most sensitive to changes in phytoplankton shape because neither the observed change in the particle size distribution (PSD) nor refractive index (assuming average refractive indices) are consistent with previous theoretical modeling results. We additionally calculated chlorophyll-a (Chl) concentrations from measurements of the diffuse light attenuation coefficient (Kd) and divided by bbp to evaluate another optical metric of phytoplankton community composition (Chl:bbp), which decreased by more than a factor of two inside the eddy. This case study demonstrates that the HSRL is able to detect changes in phytoplankton community composition. High spectral resolution lidar measurements reveal complex structures in both the vertical and horizontal distribution of phytoplankton in the mixed layer providing a valuable new tool to support other remote sensing techniques for studying mixed layer dynamics. Our results identify fronts at the periphery of mesoscale eddies as locations of abrupt changes in near-surface optical properties. 
PY 2020
PD JUL
SO Frontiers In Marine Science
SN 2296-7745
PU Frontiers Media SA
VL 7
IS 493
UT 000548189100001
DI 10.3389/fmars.2020.00493
ID 75313
ER

EF