Seasonal modification of the Arctic Ocean intermediate water layer off the eastern Laptev Sea continental shelf breakстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 27 ноября 2016 г.
Аннотация:Through the analysis of observational mooring data collected at the northeastern
Laptev Sea continental slope in 2004–2007, we document a hydrographic seasonal signal
in the intermediate Atlantic Water (AW) layer, with generally higher temperature and
salinity from December–January to May–July and lower values from May–July to
December–January. At the mooring position, this seasonal signal dominates, contributing
up to 75% of the total variance. Our data suggest that the entire AW layer down to at least
840 m is affected by seasonal cycling, although the strength of the seasonal signal in
temperature and salinity reduces from 260 m (±0.25C and ±0.025 psu) to 840 m (±0.05C
and ±0.005 psu). The seasonal velocity signal is substantially weaker, strongly masked by
high-frequency variability, and lags the thermohaline cycle by 45–75 days. We
hypothesize that our mooring record shows a time history of the along-margin propagation
of the AW seasonal signal carried downstream by the AW boundary current. Our analysis
suggests that the seasonal signal in the Fram Strait Branch of AW (FSBW) at 260 m
is predominantly translated from Fram Strait, while the seasonality in the Barents Sea
branch of AW (BSBW) domain (at 840 m) is attributed instead to the seasonal signal input
from the Barents Sea. However, the characteristic signature of the BSBW seasonal
dynamics observed through the entire AW layer leads us to speculate that BSBW also
plays a role in seasonally modifying the properties of the FSBW.