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Ocean acidification and biologically induced seasonality of carbonate mineral saturation states in the western Arctic Ocean

Ocean acidification and biologically induced seasonality of carbonate mineral saturation states in the western Arctic Ocean
Ocean acidification and biologically induced seasonality of carbonate mineral saturation states in the western Arctic Ocean
Calcium carbonate (CaCO3) mineral saturation states for aragonite (?aragonite) and calcite (?calcite) are calculated for waters of the Chukchi Sea shelf and Canada Basin of the western Arctic Ocean during the Shelf-Basin Interactions project from 2002 to 2004. On the Chukchi Sea shelf, a strong seasonality and vertical differentiation of aragonite and calcite saturation states was observed. During the summertime sea ice retreat period, high rates of phytoplankton primary production and net community production act to increase the ?aragonite and ?calcite of surface waters, while subsurface waters become undersaturated with respect to aragonite due primarily to remineralization of organic matter to CO2. This seasonal “phytoplankton-carbonate saturation state” interaction induces strong undersaturation of aragonite (?aragonite = <0.7–1) at ?40–150 m depth in the northern Chukchi Sea and in the Canada Basin within upper halocline waters at ?100–200 m depth. Patches of aragonite undersaturated surface water were also found in the Canada Basin resulting from significant sea ice melt contributions (>10%). The seasonal aragonite undersaturation of waters observed on the Chukchi Sea shelf is likely a recent phenomenon that results from the uptake of anthropogenic CO2 and subsequent ocean acidification, with seasonality of saturation states superimposed by biological processes. These undersaturated waters are potentially highly corrosive to calcifying benthic fauna (e.g., bivalves and echinoderms) found on the shelf, with implications for the food sources of large benthic feeding mammals (e.g., walrus, gray whales, and bearded seals). The benthic ecosystem of the Chukchi Sea (and other Arctic Ocean shelves) is thus potentially vulnerable to future ocean acidification and suppression of CaCO3 saturation states.
carbon dioxide
2169-9275
C11007
Bates, Nicholas R.
954a83d6-8424-49e9-8acd-e606221c9c57
Mathis, Jeremy T.
f69fdb7f-0909-4e45-9ab8-6c73f84e9d8a
Cooper, Lee W.
8798204e-fd05-49db-a986-7d1be781956e
Bates, Nicholas R.
954a83d6-8424-49e9-8acd-e606221c9c57
Mathis, Jeremy T.
f69fdb7f-0909-4e45-9ab8-6c73f84e9d8a
Cooper, Lee W.
8798204e-fd05-49db-a986-7d1be781956e

Bates, Nicholas R., Mathis, Jeremy T. and Cooper, Lee W. (2009) Ocean acidification and biologically induced seasonality of carbonate mineral saturation states in the western Arctic Ocean. Journal of Geophysical Research: Oceans, 114 (C11), C11007. (doi:10.1029/2008JC004862).

Record type: Article

Abstract

Calcium carbonate (CaCO3) mineral saturation states for aragonite (?aragonite) and calcite (?calcite) are calculated for waters of the Chukchi Sea shelf and Canada Basin of the western Arctic Ocean during the Shelf-Basin Interactions project from 2002 to 2004. On the Chukchi Sea shelf, a strong seasonality and vertical differentiation of aragonite and calcite saturation states was observed. During the summertime sea ice retreat period, high rates of phytoplankton primary production and net community production act to increase the ?aragonite and ?calcite of surface waters, while subsurface waters become undersaturated with respect to aragonite due primarily to remineralization of organic matter to CO2. This seasonal “phytoplankton-carbonate saturation state” interaction induces strong undersaturation of aragonite (?aragonite = <0.7–1) at ?40–150 m depth in the northern Chukchi Sea and in the Canada Basin within upper halocline waters at ?100–200 m depth. Patches of aragonite undersaturated surface water were also found in the Canada Basin resulting from significant sea ice melt contributions (>10%). The seasonal aragonite undersaturation of waters observed on the Chukchi Sea shelf is likely a recent phenomenon that results from the uptake of anthropogenic CO2 and subsequent ocean acidification, with seasonality of saturation states superimposed by biological processes. These undersaturated waters are potentially highly corrosive to calcifying benthic fauna (e.g., bivalves and echinoderms) found on the shelf, with implications for the food sources of large benthic feeding mammals (e.g., walrus, gray whales, and bearded seals). The benthic ecosystem of the Chukchi Sea (and other Arctic Ocean shelves) is thus potentially vulnerable to future ocean acidification and suppression of CaCO3 saturation states.

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More information

e-pub ahead of print date: 5 November 2009
Published date: November 2009
Keywords: carbon dioxide
Organisations: Ocean Biochemistry & Ecosystems

Identifiers

Local EPrints ID: 356534
URI: https://eprints.soton.ac.uk/id/eprint/356534
ISSN: 2169-9275
PURE UUID: 914822ab-c638-4450-a948-82ccdb4ec945

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Date deposited: 06 Sep 2013 09:08
Last modified: 20 Oct 2017 16:35

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