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Vulnerability of Polar Oceans to Anthropogenic Acidification: Comparison of Arctic and Antarctic Seasonal Cycles

Citation

Shadwick, EH and Trull, T and Thomas, H and Gibson, JAE, Vulnerability of Polar Oceans to Anthropogenic Acidification: Comparison of Arctic and Antarctic Seasonal Cycles, Scientific Reports, 3, (August) Article 2339. ISSN 2045-2322 (2013) [Refereed Article]


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Copyright Statement

Copyright 2013 the authors.

DOI: doi:10.1038/srep02339

Abstract

Polar oceans are chemically sensitive to anthropogenic acidification due to their relatively low alkalinity and correspondingly weak carbonate buffering capacity. Here, we compare unique CO2 system observations covering complete annual cycles at an Arctic (Amundsen Gulf) and Antarctic site (Prydz Bay). The Arctic site experiences greater seasonal warming (10 vs 3C), and freshening (3 vs 2), has lower alkalinity (2220 vs 2320 μmol/kg), and lower summer pH (8.15 vs 8.5), than the Antarctic site. Despite a larger uptake of inorganic carbon by summer photosynthesis, the Arctic carbon system exhibits smaller seasonal changes than the more alkaline Antarctic system. In addition, the excess surface nutrients in the Antarctic may allow mitigation of acidification, via CO2 removal by enhanced summer production driven by iron inputs from glacial and sea-ice melting. These differences suggest that the Arctic system is more vulnerable to anthropogenic change due to lower alkalinity, enhanced warming, and nutrient limitation.

Item Details

Item Type:Refereed Article
Keywords:Cryospheric science, Biogeochemistry, Ocean sciences, Marine chemistry
Research Division:Earth Sciences
Research Group:Oceanography
Research Field:Chemical Oceanography
Objective Division:Environment
Objective Group:Climate and Climate Change
Objective Field:Effects of Climate Change and Variability on Antarctic and Sub-Antarctic Environments (excl. Social Impacts)
Author:Shadwick, EH (Dr Elizabeth Shadwick)
Author:Trull, T (Professor Thomas Trull)
Author:Gibson, JAE (Dr John Gibson)
ID Code:85756
Year Published:2013
Web of Science® Times Cited:29
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2013-08-06
Last Modified:2014-05-09
Downloads:631 View Download Statistics

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