FN Archimer Export Format
PT J
TI Tracking water masses using passive-tracer transport in NEMO v3.4 with NEMOTAM: application to North Atlantic DeepWater and North Atlantic Subtropical ModeWater
BT 
AF STEPHENSON, Dafydd
   Muller, Simon
   SEVELLEC, Florian
AS 1:1;2:1,2;3:1,3;
FF 1:;2:;3:;
C1 Ocean and Earth Science, National Oceanography Centre Southampton, University of Southampton, UK
   National Oceanography Centre, European Way, Southampton, UK
   Laboratoire d’Océanographie Physique et Spatiale, Univ.-Brest CNRS IRD Ifremer, Brest, France
C2 UNIV SOUTHAMPTON, UK
   NOC, UK
   CNRS, FRANCE
UM LOPS
IN WOS Cotutelle UMR
   DOAJ
   copubli-europe
IF 1.591
TC 4
UR https://archimer.ifremer.fr/doc/00588/69980/67888.pdf
   https://archimer.ifremer.fr/doc/00588/69980/73305.pdf
LA English
DT Article
AB Water mass ventilation provides an important link between the atmosphere and the global ocean circulation. In this study, we present a newly developed, probabilistic tool for offline water mass tracking. In particular, NEMOTAM, the tangent-linear and adjoint counterpart to the NEMO ocean general circulation model, is modified to allow passive-tracer transport. By terminating dynamic feedbacks in NEMOTAM, tagged water can be tracked forward and backwards in time as a passive dye, producing a probability distribution of pathways and origins, respectively. Upon contact with the surface, the tracer is removed from the system, and a record of ventilation is produced. Two test cases are detailed, examining the creation and fate of North Atlantic Subtropical Mode Water (NASMW) and North Atlantic Deep Water (NADW) in a 2°ree; configuration of NEMO run with repeated annual forcing for up to 400 years. NASMW is shown to have an expected age of 4.5 years, and is predominantly eradicated by internal processes. A bed of more persistent NASMW is detected below the mixed layer with an expected age of 8.7 years It is shown that while model NADW has two distinct outcrops (in the Arctic and North Atlantic), its formation primarily takes place in the subpolar Labrador and Irminger seas. Its expected age is 112 years. 
PY 2020
PD APR
SO Geoscientific Model Development
SN 1991-959X
PU Copernicus GmbH
VL 13
IS 4
UT 000529336300001
BP 2031
EP 2050
DI 10.5194/gmd-13-2031-2020
ID 69980
ER

EF