Environmental Engineering Reference
In-Depth Information
Chapter 2
D
YNAMICS AND
E
NERGETICS OF THE
M
2
S
URFACE
AND
I
NTERNAL
T
IDES IN THE
A
RCTIC
O
CEAN
:
S
OME
M
ODEL
R
ESULTS
B.A. Kagan
∗
, A.A.Timofeev and E.V. Sofina
P.P. Shirshov Institute of Oceanology, Russian Academy of Sciences, St. Petersburg
Branch, 30, Pervaya Liniya, 199053, St. Petersburg, Russia
Abstract
Simulation results for the M
2
surface and internal tides in the Arctic Ocean are presented. The
model results for the surface tide are close to those obtained by other authors. A comparison
of the predicted amplitudes and phases of tidal sea surface level elevations with ground-based
gauge measurement data shows that our estimates are better consistent with the data than
those derived from the Fairbanks University model and worse than those derived from the
Oregon State University model, assimilating all available empirical information. The internal
tide waves (ITW) in the Arctic Ocean are of nature of trapped waves, localized near large-
scale topographic irregularities. Their amplitudes are maximum (~ 4 m) near the irregularities
and degenerate as the distance moves away from them. The ITW generation site occurs at a
small part of the continental slope to the north-west of the New Siberian islands. The ITW
decay scale at the section going across the above site is ~ 300 km and is not beyond the range
of its values (100 - 1000 km) for other oceans. Meanwhile, the local baroclinic tidal energy
dissipation rate at specific sites of Amundsen Trough and Lomonosov Ridge are significantly
less than in other oceans. The same may be said about the integrated (over area and in depth)
total (barotropic + baroclinic) tidal energy dissipation in the Arctic Ocean as a whole.
Keywords:
surface and internal tides; dynamics and energetics; the Arctic Ocean
∗
E-mail address: kgn@gk3103.spb.edu. tel.: +7(812)3282729; fax: +7(812)3285759. Corresponding author Prof.
B.A. Kagan.
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