On the Seasonal Cycles Observed at the Continental Slope of the Eastern Eurasian Basin of the Arctic Oceanстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 6 декабря 2018 г.
Аннотация:The Eurasian Basin (EB) of the Arctic Ocean is subject to substantial seasonality. We here use data collected between 2013 and 2015 from six moorings across the continental slope in the eastern EB and identify three domains, each with its own unique seasonal cycle: 1) The upper ocean (,100 m), with seasonal temperature and salinity differences of Du 5 0.168C and DS 5 0.17, is chiefly driven by the seasonal sea ice cycle. 2) The upper slope domain is characterized by the influence of a hydrographic front that spans the water column around
the ;750-m isobath. The domain features a strong temperature and moderate salinity seasonality (Du 5 1.48C; DS5 0.06), which is traceable down to;600-m depth. Probable cause of this signal is a combination of along-slope advection of signals by the Arctic Circumpolar Boundary Current, local wind-driven upwelling, and a cross-slope shift of the front. 3) The lower-slope domain, located offshore of the front, with seasonality in temperature and salinity mainly confined to the halocline (Du50.838C; DS50.11;;100–200 m). This seasonal cycle can be
explained by a vertical isopycnal displacement (DZ ; 36 m), arguably as a baroclinic response to sea level changes. Available long-term oceanographic records indicate a recent amplification of the seasonal cycle within the halocline layer, possibly associated with the erosion of the halocline. This reduces the halocline stability to isolate the ocean surface layer and sea ice from the underlying Atlantic Water heat with direct implications for the evolution of Arctic sea ice cover and climate.