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Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
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Laser-Induced Fluorescence Emission (L.I.F.E.) as Novel Non-Invasive Tool for In-Situ Measurements of Biomarkers in Cryospheric Habitats
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Decrease in the CO2 uptake capacity in an ice-free Arctic Ocean basin.

Wei-Jun Cai1, Liqi Chen, Baoshan Chen

  • 1Department of Marine Sciences, University of Georgia, Athens, GA 30602, USA. wcai@uga.edu

Science (New York, N.Y.)
|July 24, 2010
PubMed
Summary
This summary is machine-generated.

The Arctic Ocean may not become a significant carbon dioxide (CO2) sink as previously thought. Recent studies show higher CO2 levels in the Canada Basin, hindering further atmospheric CO2 uptake.

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Area of Science:

  • Oceanography
  • Climate Science
  • Biogeochemistry

Background:

  • Arctic Ocean is projected to absorb more atmospheric carbon dioxide (CO2) due to sea ice melt and increased primary productivity.
  • Previous predictions were based on data from productive margins or ice-covered areas before significant ice retreat.

Purpose of the Study:

  • To investigate the sea-surface CO2 concentration in the Canada Basin using high-resolution surveys.
  • To reassess the role of the Arctic Ocean as a carbon sink in ice-free conditions.

Main Methods:

  • High-resolution survey of sea-surface CO2 concentration.
  • Comparison with historical observations.

Main Results:

  • Observed a significant increase in sea-surface CO2 concentration in the Canada Basin compared to earlier data.
  • Identified rapid CO2 invasion from the atmosphere and limited biological CO2 drawdown as primary drivers.
  • Higher CO2 levels act as a barrier to further atmospheric CO2 uptake.

Conclusions:

  • The Arctic Ocean basin may not function as a substantial atmospheric CO2 sink under future ice-free conditions.
  • Current understanding of the Arctic Ocean's carbon sequestration capacity needs revision.