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On the flow of Atlantic water and temperature anomalies in the Nordic Seas toward the Arctic Ocean

Chafik, L. (author)
Nilsson, Johan (author)
Stockholms universitet,Meteorologiska institutionen (MISU)
Skagseth, O. (author)
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Lundberg, Peter (author)
Stockholms universitet,Meteorologiska institutionen (MISU)
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 (creator_code:org_t)
2015
2015
English.
In: Journal of Geophysical Research - Oceans. - 2169-9275 .- 2169-9291. ; 120:12, s. 7897-7918
  • Journal article (peer-reviewed)
Abstract Subject headings
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  • The climatic conditions over the Arctic Ocean are strongly influenced by the inflow of warm Atlantic water conveyed by the Norwegian Atlantic Slope Current (NwASC). Based on sea surface height (SSH) data from altimetry, we develop a simple dynamical measure of the NwASC transport to diagnose its spatio-temporal variability. This supports a dynamical division of the NwASC into two flow regimes; the SvinOy Branch (SvB) in the southern Norwegian Sea, and the Fram Strait Branch (FSB) west of Spitsbergen. The SvB transport is well correlated with the SSH and atmospheric variability within the Nordic Seas, factors that also affect the inflow to the Barents Sea. In contrast, the FSB is influenced by regional atmospheric conditions around Svalbard and northern Barents Sea. Using a composite analysis, we further relate anomalous strong SvB flow events to temperature fluctuations along the core of Atlantic water. A warm composite anomaly is found to propagate northward, with a tendency to amplify enroute, after these events. A roughly 12 months delayed temperature signal is identified in the FSB. However, also in the Lofoten Basin interior a delayed temperature signal is found, which appears to originate from the NwASC. This study suggests that hydrographic anomalies both upstream from the North Atlantic, and locally generated in the Norwegian Sea, are important for the oceanic heat and salt transport that eventually enters into the Arctic.

Subject headings

NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Oceanografi, hydrologi och vattenresurser (hsv//swe)
NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Oceanography, Hydrology and Water Resources (hsv//eng)

Keyword

poleward transport
warm anomalies
Nordic Seas
Arctic Ocean
Barents Sea
sea-ice

Publication and Content Type

ref (subject category)
art (subject category)

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Chafik, L.
Nilsson, Johan
Skagseth, O.
Lundberg, Peter
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NATURAL SCIENCES
NATURAL SCIENCES
and Earth and Relate ...
and Oceanography Hyd ...
Articles in the publication
Journal of Geoph ...
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Stockholm University

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