Variability in transport of terrigenous material on the shelves and the deep Arctic Ocean during the Holocene


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Michael.Fritz [ at ] awi.de

Abstract

Arctic coastal zones serve as a sensitive filter for terrigenous matter input onto the shelves via river discharge and coastal erosion. This material is further distributed across the Arctic by ocean currents and sea ice. The coastal regions are particularly vulnerable to changes related to recent climate change. We compiled a pan-arctic review that looks into the changing Holocene sources, transport processes and sinks of terrigenous sediment in the Arctic Ocean. Existing paleoceanographic studies demonstrate how climate warming and the disappearance of ice sheets during the early Holocene initiated eustatic sea-level rise that greatly modified the physiography of the Arctic Ocean. Sedimentation rates over the shelves and slopes were much greater during periods of rapid sea-level rise in the early and middle Holocene, due to the relative distance to the terrestrial sediment sources. However, estimates of suspended sediment delivery through major Arctic rivers do not indicate enhanced delivery during this time, thus, suggesting enhanced rates of coastal erosion. The increased supply of terrigenous material to the outer shelves and deep Arctic Ocean in the early and middle Holocene might serve as analogous to forecast changes in the future Arctic.



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Eprint ID
39220
DOI 10.3402/polar.v34.24964

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Wegner, C. , Bennett, K. E. , de Vernal, A. , Forwick, M. , Fritz, M. , Heikkilä, M. , Łącka, M. , Lantuit, H. , Laska, M. , Moskalik, M. , O´Regan, M. , Pawłowska, J. , Promińska, A. , Rachold, V. , Vonk, J. E. and Werner, K. (2015): Variability in transport of terrigenous material on the shelves and the deep Arctic Ocean during the Holocene , Polar Research, 34 , p. 24964 . doi: 10.3402/polar.v34.24964


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