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Summertime calcium carbonate undersaturation in shelf waters of the western Arctic Ocean - how biological processes exacerbate the impact of ocean acidification

Summertime calcium carbonate undersaturation in shelf waters of the western Arctic Ocean - how biological processes exacerbate the impact of ocean acidification
Summertime calcium carbonate undersaturation in shelf waters of the western Arctic Ocean - how biological processes exacerbate the impact of ocean acidification
The Arctic Ocean accounts for only 4% of the global ocean area, but it contributes significantly to the global carbon cycle. Recent observations of seawater CO2-carbonate chemistry in shelf waters of the western Arctic Ocean, primarily in the Chukchi Sea, from 2009 to 2011 indicate that bottom waters are seasonally undersaturated with respect to calcium carbonate (CaCO3) minerals, particularly aragonite. Nearly 40% of sampled bottom waters on the shelf have saturation states less than one for aragonite (i.e., ?aragonite < 1.0), thereby exposing the benthos to potentially corrosive water for CaCO3-secreting organisms, while 80% of bottom waters present had ?aragonite values less than 1.5. Our observations indicate seasonal reduction of saturation states (?) for calcite (?calcite) and aragonite (?aragonite) in the subsurface in the western Arctic by as much as 0.8 and 0.5, respectively. Such data indicate that bottom waters of the western Arctic shelves were already potentially corrosive for biogenic and sedimentary CaCO3 for several months each year. Seasonal changes in ? are imparted by a variety of factors such as phytoplankton photosynthesis, respiration/remineralization of organic matter and air–sea gas exchange of CO2. Combined, these processes either increase or enhance in surface and subsurface waters, respectively. These seasonal physical and biological processes also act to mitigate or enhance the impact of Anthropocene ocean acidification (OA) on ? in surface and subsurface waters, respectively. Future monitoring of the western Arctic shelves is warranted to assess the present and future impact of ocean acidification and seasonal physico-biogeochemical processes on ? values and Arctic marine ecosystems.
1726-4170
5281-5309
Bates, N.R.
954a83d6-8424-49e9-8acd-e606221c9c57
Orchowska, M.I.
43c51627-7b1b-4776-b062-7e0985337433
Garley, R.
d23dffe7-041d-460b-b06a-ff103da9d388
Mathis, J.T.
ea2fbcc0-d00e-44d4-98a8-0f97e7e3274b
Bates, N.R.
954a83d6-8424-49e9-8acd-e606221c9c57
Orchowska, M.I.
43c51627-7b1b-4776-b062-7e0985337433
Garley, R.
d23dffe7-041d-460b-b06a-ff103da9d388
Mathis, J.T.
ea2fbcc0-d00e-44d4-98a8-0f97e7e3274b

Bates, N.R., Orchowska, M.I., Garley, R. and Mathis, J.T. (2013) Summertime calcium carbonate undersaturation in shelf waters of the western Arctic Ocean - how biological processes exacerbate the impact of ocean acidification. Biogeosciences, 10 (8), 5281-5309. (doi:10.5194/bg-10-5281-2013).

Record type: Article

Abstract

The Arctic Ocean accounts for only 4% of the global ocean area, but it contributes significantly to the global carbon cycle. Recent observations of seawater CO2-carbonate chemistry in shelf waters of the western Arctic Ocean, primarily in the Chukchi Sea, from 2009 to 2011 indicate that bottom waters are seasonally undersaturated with respect to calcium carbonate (CaCO3) minerals, particularly aragonite. Nearly 40% of sampled bottom waters on the shelf have saturation states less than one for aragonite (i.e., ?aragonite < 1.0), thereby exposing the benthos to potentially corrosive water for CaCO3-secreting organisms, while 80% of bottom waters present had ?aragonite values less than 1.5. Our observations indicate seasonal reduction of saturation states (?) for calcite (?calcite) and aragonite (?aragonite) in the subsurface in the western Arctic by as much as 0.8 and 0.5, respectively. Such data indicate that bottom waters of the western Arctic shelves were already potentially corrosive for biogenic and sedimentary CaCO3 for several months each year. Seasonal changes in ? are imparted by a variety of factors such as phytoplankton photosynthesis, respiration/remineralization of organic matter and air–sea gas exchange of CO2. Combined, these processes either increase or enhance in surface and subsurface waters, respectively. These seasonal physical and biological processes also act to mitigate or enhance the impact of Anthropocene ocean acidification (OA) on ? in surface and subsurface waters, respectively. Future monitoring of the western Arctic shelves is warranted to assess the present and future impact of ocean acidification and seasonal physico-biogeochemical processes on ? values and Arctic marine ecosystems.

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More information

Published date: 6 August 2013
Organisations: Ocean Biochemistry & Ecosystems

Identifiers

Local EPrints ID: 356947
URI: https://eprints.soton.ac.uk/id/eprint/356947
ISSN: 1726-4170
PURE UUID: 8f9974b3-f24a-41c3-a882-6e8d9def612c

Catalogue record

Date deposited: 17 Sep 2013 14:10
Last modified: 16 Jul 2019 21:23

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