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Middle to late Holocene paleoproductivity reconstructionsfor the western Barents Sea: a model-data comparison

Pathirana, Irene Dorothea; Knies, Jochen; Felix, Maarten; Mann, U.; Ellingsen, Ingrid H.
Journal article, Peer reviewed
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http://hdl.handle.net/11250/2420476
Utgivelsesdato
2015
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  • Institutt for geovitenskap og petroleum [1834]
  • Publikasjoner fra CRIStin - NTNU [19694]
Originalversjon
arktos The Journal of Arctic Geosciences 2015, 1(1)   10.1007/s41063-015-0002-z
Sammendrag
In this study we focus on late Holocene primary

productivity (PP) variability in the western Barents Sea and its

response to variable sea ice coverage by combining PP

reconstructed from several sediment cores with regional PP

trends simulated with a well-constrained organic facies

model, OF-Mod 3D. We find that modern production rates

reconstructed from buried marine organic matter (‘‘bottomup’’)

resemble simulated export production at 50 m water

depth inferred from numerical simulations of surface water

PP in a 3D ocean model, SINMOD (‘‘top-down’’). Paleoproductivity

rates in the northern Barents Sea are more variable

and generally higher (30–150 gC m-2 year-1) than in

the SWBarents Sea region (\75 gC m-2 year-1) throughout

the last 6000 years BP. In the SW Barents Sea, PP rates and

terrestrial organic matter (TOM) supply remain constantly

low indicating present-day-like oceanographic conditions with only marginal influence of sea ice related processes

during the last 6000 years BP. PP rates in the northern Barents

Sea indicate a shift from stable modern-like conditions prior

to 2800 BP to denser, more permanent sea ice coverage along

the marginal ice zone (MIZ) between 2800 and 1000 years

BP and low PP rates. PP rates increase around 1000 years BP

indicating a northward shift of the MIZ and accelerated export

towards the seabed. During the last 500 years a pronounced

decline in PP rates towards the present day indicates reduced

annual duration of the MIZ in the area due to global warming.

Our results suggest that a combination of first-year ice and

higher PP in a warming pan-Arctic may point to a potential

Arctic carbon sink while sea ice is still present.
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Springer
Tidsskrift
Arktos

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