FN Archimer Export Format
PT J
TI Characterization of Convective Plumes Associated With Oceanic Deep Convection in the Northwestern Mediterranean From High Resolution In-Situ Data Collected by Gliders
BT 
AF MARGIRIER, Felix
   BOSSE, Anthony
   TESTOR, Pierre
   L'HEVEDER, Blandine
   MORTIER, Laurent
   SMEED, David
AS 1:1;2:1,2;3:1;4:1;5:1,3;6:4;
FF 1:;2:;3:;4:;5:;6:;
C1 Univ Paris06, Sorbonne Univ UPMC, Lab LOCEAN, CNRS,IRD,MNHN, Paris, France.
   Univ Bergen, Geophys Inst, Bergen, Norway.
   ENSTA ParisTech, Palaiseau, France.
   Natl Oceanog Ctr, Southampton, Hants, England.
C2 UNIV PARIS06, FRANCE
   UNIV BERGEN, NORWAY
   ENSTA PARISTECH, FRANCE
   NOC, UK
IF 2.711
TC 17
UR https://archimer.ifremer.fr/doc/00405/51669/52218.pdf
LA English
DT Article
CR DEWEX-MERMEX 2013 LEG1
   DEWEX-MERMEX 2013 LEG2
   DOWEX2012
   DOWEX2013
   HYMEX_SOP1
   HYMEX_SOP2
   MOOSE-GE 2010
   MOOSE-GE 2011
   MOOSE-GE 2012
   MOOSE-GE 2013
   MOOSE-GE 2014
   MOOSE-GE 2015
   MOOSE-GE 2016
BO Le Suroît
   Téthys II
   L'Europe
   L'Atalante
DE ;convective plumes;northwestern Mediterranean;vertical velocities;deep convection;gliders;mixing
AB Numerous gliders have been deployed in the Gulf of Lions (Northwestern Mediterranean Sea) and in particular during episodes of open-ocean deep convection in the winter 2012–2013. The data collected represents an unprecedented density of in-situ observations providing a first in-situ statistical and 3D characterization of the important mixing agents of the deep convection phenomenon, the so-called plumes. A methodology based on a glider-static flight model was applied to infer the oceanic vertical velocity signal from the glider navigation data. We demonstrate that, during the active phase of mixing, the gliders underwent significant oceanic vertical velocities up to 18 cm.s−1. Focusing on the data collected by two gliders during the 2012–2013 winter, 120 small scale convective downward plumes were detected with a mean radius of 350∼m and separated by about 2∼km. We estimate that the plumes cover 27% of the convection area. Gliders detected downward velocities with a magnitude larger than that of the upward ones (-6 cm.s−1 versus +2 cm.s−1 on average). Along track recordings of temperature and salinity as well as biogeochemical properties (dissolved oxygen, fluorescence, turbidity) allow a statistical characterization of the water masses' properties in the plumes' core with respect to the 'background': the average downward signal is of colder (-1.8 × 10−3°C), slightly saltier (+4.9 × 10−4 psu) and thus denser waters (+7.5 × 10−4 kg.m−3). The plunging waters are also on average more fluorescent (+2.3 × 10−2 μg.L−1). The plumes are associated with a vertical diffusion coefficient of 7.0 m2.s−1 and their vertical velocity variance scales with the ratio of the buoyancy loss over the Coriolis parameter to the power 0.86. 
PY 2017
PD DEC
SO Journal Of Geophysical Research-oceans
SN 2169-9275
PU Amer Geophysical Union
VL 122
IS 12
UT 000422732100030
BP 9814
EP 9826
DI 10.1002/2016JC012633
ID 51669
ER

EF