FN Archimer Export Format
PT J
TI Vertical motions and their effects on a biogeochemical tracer in a cyclonic structure finely observed in the Ligurian Sea
BT 
AF Rousselet, L.
   Doglioli, A.M.
   De Verneil, A.
   Pietri, A.
   Della Penna, A.
   Berline, L.
   Marrec, P.
   Grégori, G.
   Thyssen, M.
   Carlotti, F.
   Barillon, S.
   Simon‐Bot, F.
   Bonal, M.
   d'Ovidio, F.
   Petrenko, A.
AS 1:1;2:1;3:2;4:3;5:4;6:1;7:1;8:1;9:1;10:1;11:1;12:1;13:5;14:3;15:1;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;13:;14:;15:;
C1 Aix Marseille Univ, Université de Toulon, CNRS, IRD, OSU PYTHEAS, Mediterranean Institute of Oceanography MIO, 7 UM 110, 13288, Marseille, Cedex 09, France
   The Center for Prototype Climate Modeling, New York University, Abu Dhabi, UAE
   Sorbonne Université, CNRS, IRD, MNHN, Laboratoire d’Océanographie et du Climat: Expérimentations et Approches 10 Numériques (LOCEAN-IPSL), 75005 Paris, France
   Applied Physics Laboratory, University of Washington, Seattle, Washington, USA
   Laboratoire d’Écologie des Systèmes Aquatiques, Université Libre de Bruxelles, Campus de la Plaine - CP221, Belgium
C2 UNIV AIX MARSEILLE, FRANCE
   UNIV NEW YORK, UNITED ARAB EMIRATES
   UNIV PARIS 06, FRANCE
   UNIV WASHINGTON, USA
   UNIV LIBRE BRUXELLES, BELGIUM
IF 3.559
TC 12
UR https://archimer.ifremer.fr/doc/00490/60214/63567.pdf
   https://archimer.ifremer.fr/doc/00490/60214/63569.pdf
   https://archimer.ifremer.fr/doc/00490/60214/63570.pdf
   https://archimer.ifremer.fr/doc/00490/60214/63571.pdf
   https://archimer.ifremer.fr/doc/00490/60214/63572.pdf
   https://archimer.ifremer.fr/doc/00490/60214/63573.pdf
   https://archimer.ifremer.fr/doc/00490/60214/63574.pdf
   https://archimer.ifremer.fr/doc/00490/60214/63575.pdf
LA English
DT Article
CR OSCAHR
BO Téthys II
DE ;high-resolution reconstructions of 3-D fields;vertical velocities estimated with omega-equation;particle distribution as a tracer for vertical advection
AB Vertical velocities can be estimated indirectly from in situ observations by theoretical frameworks like the ω‐equation. Direct measures of vertical exchanges are challenging due to their typically ephemeral spatiotemporal scales. In this study we address this problem with an adaptive sampling strategy coupling various biophysical instruments. We analyze the 3‐D organization of a cyclonic mesoscale structure finely sampled during the OSCAHR (Observing Submesoscale Coupling At High Resolution) cruise in the Ligurian Sea during fall 2015. The observations, acquired with a Moving Vessel Profiler (MVP), highlight a subsurface low‐salinity layer (≃ 50 m), as well as rising isopycnals, generated by geostrophic cyclonic circulation, in the structure's center. Reconstructed 3‐D fields of density and horizontal velocities are used to estimate the vertical velocity field down to 250 m by applying the adiabatic QG ω‐equation, for the first time in this region. The vertical motions are characterized by multi‐polar patterns of downward and upward velocities on the edges of the structure and significantly smaller vertical velocities in its center. Both the 3‐D distribution of particles (size ≥ 100 μm), measured with a Laser Optical Plankton Counter (LOPC), and the Synechococcus and Prochlorococcus abundances (cell cm−3) measured by flow cytometry are consistent with the 3‐D velocity field. In particular, a secondary vertical recirculation is identified that upwells particles (from 250 to 100 m) along isohalines to the structure's center. Besides demonstrating the effect of vertical patterns on biogeochemical distributions, this case study suggests to use particle matter as a tracer to assess physical dynamics. 
PY 2019
PD JUL
SO Journal Of Geophysical Research-oceans
SN 2169-9275
PU American Geophysical Union (AGU)
VL 124
IS 6
UT 000477722200006
BP 3561
EP 3574
DI 10.1029/2018JC014392
ID 60214
ER

EF