Statistical analysis of Lagrangian transport of subtropical waters in the Japan Sea based on AVISO altimetry data
Other literature type
Prants, Sergey V.
Budyansky, Maxim V.
Uleysky, Michael Yu.
(issn: 1607-7946, eissn: 1607-7946)
Northward near-surface Lagrangian transport of subtropical waters in the
Japan Sea frontal zone is simulated and analysed based on altimeter data for
the period from 2 January 1993 to 15 June 2015. Computing different
Lagrangian indicators for a large number of synthetic tracers launched weekly
for 21 years in the southern part of the Sea, we find preferred transport
pathways across the Subpolar Front. This cross-frontal transport is
statistically shown to be meridionally inhomogeneous with <q>gates</q> and
<q>barriers</q> whose locations are determined by the local advection velocity
field. The gates <q>open</q> due to suitable dispositions of mesoscale eddies
facilitating propagation of subtropical waters to the north. It is documented
for the western, central and eastern gates with the help of different kinds
of Lagrangian maps and verified by some tracks of available drifters. The
transport through the gates occurs by a portion-like manner, i.e.
subtropical tracers pass the gates in specific places and during specific
time intervals. There are some <q>forbidden</q> zones in the frontal area where
the northward transport has not been observed during all the observation
period. They exist due to long-term peculiarities of the advection velocity