FN Archimer Export Format
PT J
TI Measuring vertical velocities with ADCPs in low-energy ocean
BT 
AF Comby, Caroline
   Barrillon, Stéphanie
   Fuda, Jean-Luc
   Doglioli, Andrea M.
   Tzortzis, Roxane
   Grégori, Gérald
   Thyssen, Melilotus
   Petrenko, Anne A.
AS 1:1;2:1;3:1;4:1;5:1;6:1;7:1;8:1;
FF 1:;2:;3:;4:;5:;6:;7:;8:;
C1 Aix Marseille Univ., Université de Toulon, CNRS, IRD, MIO UM 110, 13288, Marseille, France
C2 UNIV AIX MARSEILLE, FRANCE
IF 2.2
TC 3
UR https://archimer.ifremer.fr/doc/00787/89891/95388.pdf
LA English
DT Article
CR FUMSECK
   OSCAHR
BO Téthys II
DE ;Ocean;Ageostrophic circulations;Vertical motion;Surface layer;In situ oceanic observations
AB Vertical velocities knowledge is essential to study fine-scale dynamics in the surface layers of the ocean and to understand their impact on biological production mechanisms. However, these vertical velocities have long been neglected, simply parameterized, or considered as not measurable, due mainly to their order of magnitude (< mm s−1 up to cm s−1), generally much lower than the one of the horizontal velocities (cm s−1 to dm s−1), hence the challenge of their in situ measurement. In this paper, we present an upgraded method for direct in situ measurement of vertical velocities using data from different Acoustic Doppler Current Profilers (ADCPs) associated with CTD probes, and we perform a comparative analysis of the results obtained by this method. The analyzed data were collected during the FUMSECK cruise, from three ADCPs: two Workhorse (conventional ADCPs), one lowered on a carousel and the other deployed in free-fall mode, and one Sentinel V (a new generation ADCP with four classical beams and a fifth vertical beam), also lowered on a carousel. Our analyses provide profiles of vertical velocities on the order of mm s−1, as expected, with standard deviations of a few mm s−1. While the fifth beam of the Sentinel V exhibits a better accuracy than conventional ADCPs, the free-fall technique provides a more accurate measurement compared to the carousel technique. Finally, this innovative study opens up the possibility to perform simple and direct in situ measurements of vertical velocities, coupling the free-fall technique with a five-beam ADCP. 
PY 2022
PD NOV
SO Journal Of Atmospheric And Oceanic Technology
SN 0739-0572
PU American Meteorological Society
VL 39
IS 11
UT 000890914600003
BP 1669
EP 1684
DI 10.1175/JTECH-D-21-0180.1
ID 89891
ER

EF