Interannual variability of water mass in the Greenland Sea and the adjacent areasстатья
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Дата последнего поиска статьи во внешних источниках: 27 ноября 2016 г.
Аннотация:Oceanographic data covering the period 1950–1998 are used to deter-
mine interannual variations in the convection intensity and water mass
structure in the Greenland Sea and adjacent areas. Extremely cold win-
ters throughout 1965–1970 assisted intensification of the water vertical
exchange in the Greenland and Norwegian seas. As a result, cold and
fresh Greenland Sea Deep Water (GSDW) production was extremely
high in the central Greenland Sea while in the southern Norwegian Sea
warm and salty water spread downwards. The recent rapid warming in
the Greenland Sea Gyre interior from 1980 originates, we argue, from
an increase in the Atlantic Water (AW) temperature due to the advection
of warm waters into the region with the Return Atlantic Current. The
negative water temperature and salinity trends in the upper 300 m layer
of the Atlantic Water in the Norwegian Sea prevailed during 1950–1990,
whereas during 1980–1990 the water temperature trends are indicative
of warming of that layer. Observation series obtained onboard the Ocean
Weather Ship Mike confirmed the existence of layers with advection-
driven high oxygen concentrations in intermediate and deep layers. The
depth of oxygen maxima and the values of oceanographic parameters at
this horizon can be regarded as indicators of the convection intensity in
the Arctic domain. A simultaneous rise in NAO index and GSDW tem-
perature points to a link between atmospheric and thermohaline circula-
tion. Weakening in water exchange with the North Atlantic could be the
reason for the Polar Water recirculation increase within the Nordic seas.