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AGU: Geophysical Research Letters

 

Keywords

  • POC
  • lateral transport
  • Canada Basin

Index Terms

  • Oceanography: Biological and Chemical: Carbon cycling
  • Oceanography: General: Arctic and Antarctic oceanography
  • Oceanography: Biological and Chemical: Radioactivity and radioisotopes
  • Oceanography: Biological and Chemical: Stable isotopes
  • Oceanography: General: Time series experiments

Abstract

Lateral organic carbon supply to the deep Canada Basin

Jeomshik Hwang

Woods Hole Oceanographic Institution, Woods Hole, Massachusetts, USA

Timothy I. Eglinton

Woods Hole Oceanographic Institution, Woods Hole, Massachusetts, USA

Richard A. Krishfield

Woods Hole Oceanographic Institution, Woods Hole, Massachusetts, USA

Steven J. Manganini

Woods Hole Oceanographic Institution, Woods Hole, Massachusetts, USA

Susumu Honjo

Woods Hole Oceanographic Institution, Woods Hole, Massachusetts, USA

Understanding the processes driving the carbon cycle in the Arctic Ocean is important for assessing the impacts of the predicted rapid and amplified climate change in this region. We analyzed settling particle samples intercepted by a time-series sediment trap deployed in the abyssal Canada Basin (at 3067 m) in order to examine carbon export to the deep Arctic Ocean. Strikingly old radiocarbon ages (apparent mean 14C age = ∼1900 years) of the organic carbon, abundant lithogenic material (∼80%), and mass flux variations temporally decoupled from the cycle of primary productivity in overlying surface waters together suggest that, unlike other ocean basins, the majority of the particulate organic carbon entering the deep Canada Basin is supplied from the surrounding margins.

Received 8 April 2008; accepted 19 May 2008; published 12 June 2008.

Citation: Hwang, J., T. I. Eglinton, R. A. Krishfield, S. J. Manganini, and S. Honjo (2008), Lateral organic carbon supply to the deep Canada Basin, Geophys. Res. Lett., 35, L11607, doi:10.1029/2008GL034271.

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