FN Archimer Export Format
PT J
TI Intramonth oscillations of Atlantic ITCZ observed in SMAP satellite salinity
BT 
AF Grodsky, Semyon A.
   Reul, Nicolas
   Vandemark, Douglas
   Bentamy, Abderrahim
AS 1:1;2:2;3:3;4:2;
FF 1:;2:PDG-ODE-LOPS-SIAM;3:;4:PDG-ODE-LOPS-SIAM;
C1 Department of Atmospheric and Oceanic Science, University of Maryland, College Park, MD, USA
   CNRS, IRD, Laboratoire d’Oceanographie Physique et Spatiale (LOPS), IUEM, IFREMER, Univ. Brest, Brest, France
   Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Durham, NH, USA
C2 UNIV MARYLAND, USA
   IFREMER, FRANCE
   UNIV NEW HAMPSHIRE, USA
SI TOULON
   BREST
SE PDG-ODE-LOPS-SIAM
UM LOPS
IN WOS Ifremer UMR
   copubli-int-hors-europe
IF 3.151
TC 2
UR https://archimer.ifremer.fr/doc/00509/62045/66197.pdf
LA English
DT Article
AB The time variability of wind and rainfall in the Atlantic Intertropical Convergence Zone (ITCZ) has a wide oscillation spectrum that includes strong intra-month periodicities. These latter short-period oscillations span from individual convection lifecycle events of a few hours to longer pentad and multi-week convective cluster periods. This study reports on measured ITCZ rain variability at periods of a few weeks and its imprint on sea surface salinity (SSS) observed using satellite remote sensing. Despite small amplitude of variations of only 0.1−0.2 psu, these changes are shown to be detectable in radiometer SSS estimates collected by the Soil Moisture Active Passive (SMAP) satellite. They are shown to develop in the mid-Atlantic ITCZ latitude band and to follow its seasonal meridional progression. These rain-correlated sea surface signatures appear quasi-synchronously across a wide range of longitude. Both the ITCZ-related seasonal migration and high zonal propagation speeds distinguish these intra-month SSS oscillations from that of tropical instability waves (TIW), with TIWs having periods greater than 1 month and slower westward propagation. While detection of tropical Atlantic TIW salinity signatures using satellite data has received significant attention, it appears that atmospheric freshwater forcing impacts on the upper ocean at these shorter periods represents an additional process resolvable from space using SMAP. Correlation analyses of precipitation and winds indicate that low latitude convection clusters are accompanied by an upward Ekman pumping anomaly, which uplifts saltier water to surface layers diluted by enhanced precipitation. These vertical processes modify the salt balance and change the phase relationship between the oceanic SSS response and the atmospheric freshwater forcing. 
PY 2020
PD FEB
SO International Journal Of Remote Sensing
SN 0143-1161
PU Informa UK Limited
VL 41
IS 3
UT 000479081000001
BP 839
EP 857
DI 10.1080/01431161.2019.1648908
ID 62045
ER

EF