Towards a Warmer Arctic Ocean: Spreading of the Early 21st Century Atlantic Water Warm Anomaly Along The Eurasian Basin Margins,статья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 27 ноября 2016 г.
Аннотация:We document through the analysis of 2002–2005 observational data the recent
Atlantic Water (AW) warming along the Siberian continental margin due to
several AW warm impulses that penetrated into the Arctic Ocean through Fram Strait in
1999–2000. The AW temperature record from our long-term monitoring site in the
northern Laptev Sea shows several events of rapid AW temperature increase totaling 0.8C
in February–August 2004. We hypothesize the along-margin spreading of this warmer
anomaly has disrupted the downstream thermal equilibrium of the late 1990s to
earlier 2000s. The anomaly mean velocity of 2.4–2.5 ± 0.2 cm/s was obtained on the basis
of travel time required between the northern Laptev Sea and two anomaly fronts
delineated over the Eurasian flank of the Lomonosov Ridge by comparing the
2005 snapshot along-margin data with the AW pre-1990 mean. The magnitude of
delineated anomalies exceeds the level of pre-1990 mean along-margin cooling and rises
above the level of noise attributed to shifting of the AW jet across the basin margins. The
anomaly mean velocity estimation is confirmed by comparing mooring-derived AW
temperature time series from 2002 to 2005 with the downstream along-margin AW
temperature distribution from 2005. Our mooring current meter data corroborate these
estimations.