Distributions of surface water CO2 and air-sea flux of CO2 in coastal regions of the Canadian Beaufort Sea in late summer
To quantify the air-sea flux of CO 2 in a high-latitude coastal region, we conducted shipboard observations of atmospheric and surface water partial pressures of CO 2 ( p CO 2 ) and total dissolved inorganic carbon (TCO 2 ) in the Canadian Beaufort Sea (150° W–127° W; 69° N–73° N) in late summer 200...
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ftcopernicus:oai:publications.copernicus.org:bgd6112 2023-05-15T15:15:09+02:00 Distributions of surface water CO2 and air-sea flux of CO2 in coastal regions of the Canadian Beaufort Sea in late summer Murata, A. Shimada, K. Nishino, S. Itoh, M. 2018-09-26 application/pdf https://doi.org/10.5194/bgd-5-5093-2008 https://www.biogeosciences-discuss.net/bgd-2008-0180/ eng eng doi:10.5194/bgd-5-5093-2008 https://www.biogeosciences-discuss.net/bgd-2008-0180/ eISSN: 1726-4189 Text 2018 ftcopernicus https://doi.org/10.5194/bgd-5-5093-2008 2019-12-24T09:58:03Z To quantify the air-sea flux of CO 2 in a high-latitude coastal region, we conducted shipboard observations of atmospheric and surface water partial pressures of CO 2 ( p CO 2 ) and total dissolved inorganic carbon (TCO 2 ) in the Canadian Beaufort Sea (150° W–127° W; 69° N–73° N) in late summer 2000 and 2002. Surface water p CO 2 was lower than atmospheric p CO 2 (2000, 361.0 μatm; 2002, 364.7 μatm), and ranged from 250 to 344 μatm. Accordingly, Δ p CO 2 , which is the driving force of the air-sea exchange of CO 2 and is calculated from differences in p CO 2 between the sea surface and the overlying air, was generally negative (potential sink for atmospheric CO 2 ), although positive Δ p CO 2 values (source) were also found locally. Distributions of surface water p CO 2 , as well as those of Δ p CO 2 and CO 2 flux, were controlled mainly by water mixing related to river discharge. The air-sea fluxes of CO 2 were −15.0 and −16.8 mmol m −2 d −1 on average in 2000 and 2002, respectively, implying that the area acted as a moderate sink for atmospheric CO 2 . The air-to-sea net CO 2 flux in an extended area of the western Arctic Ocean (411 000 km 2 ) during the ice-free season (=100 days) was calculated as 10.2±7.7 mmol m −2 d −1 , equivalent to a regional CO 2 sink of 5.0±3.8 Tg C. The estimated buffer factor was 1.5, indicating that the area is a high-capacity CO 2 sink. These CO 2 flux estimates will need to be revised because they probably include a bias due to the vertical gradients of physical and chemical properties characteristic in the region, which have not yet been adequately considered. Text Arctic Arctic Ocean Beaufort Sea Copernicus Publications: E-Journals Arctic Arctic Ocean |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
To quantify the air-sea flux of CO 2 in a high-latitude coastal region, we conducted shipboard observations of atmospheric and surface water partial pressures of CO 2 ( p CO 2 ) and total dissolved inorganic carbon (TCO 2 ) in the Canadian Beaufort Sea (150° W–127° W; 69° N–73° N) in late summer 2000 and 2002. Surface water p CO 2 was lower than atmospheric p CO 2 (2000, 361.0 μatm; 2002, 364.7 μatm), and ranged from 250 to 344 μatm. Accordingly, Δ p CO 2 , which is the driving force of the air-sea exchange of CO 2 and is calculated from differences in p CO 2 between the sea surface and the overlying air, was generally negative (potential sink for atmospheric CO 2 ), although positive Δ p CO 2 values (source) were also found locally. Distributions of surface water p CO 2 , as well as those of Δ p CO 2 and CO 2 flux, were controlled mainly by water mixing related to river discharge. The air-sea fluxes of CO 2 were −15.0 and −16.8 mmol m −2 d −1 on average in 2000 and 2002, respectively, implying that the area acted as a moderate sink for atmospheric CO 2 . The air-to-sea net CO 2 flux in an extended area of the western Arctic Ocean (411 000 km 2 ) during the ice-free season (=100 days) was calculated as 10.2±7.7 mmol m −2 d −1 , equivalent to a regional CO 2 sink of 5.0±3.8 Tg C. The estimated buffer factor was 1.5, indicating that the area is a high-capacity CO 2 sink. These CO 2 flux estimates will need to be revised because they probably include a bias due to the vertical gradients of physical and chemical properties characteristic in the region, which have not yet been adequately considered. |
format |
Text |
author |
Murata, A. Shimada, K. Nishino, S. Itoh, M. |
spellingShingle |
Murata, A. Shimada, K. Nishino, S. Itoh, M. Distributions of surface water CO2 and air-sea flux of CO2 in coastal regions of the Canadian Beaufort Sea in late summer |
author_facet |
Murata, A. Shimada, K. Nishino, S. Itoh, M. |
author_sort |
Murata, A. |
title |
Distributions of surface water CO2 and air-sea flux of CO2 in coastal regions of the Canadian Beaufort Sea in late summer |
title_short |
Distributions of surface water CO2 and air-sea flux of CO2 in coastal regions of the Canadian Beaufort Sea in late summer |
title_full |
Distributions of surface water CO2 and air-sea flux of CO2 in coastal regions of the Canadian Beaufort Sea in late summer |
title_fullStr |
Distributions of surface water CO2 and air-sea flux of CO2 in coastal regions of the Canadian Beaufort Sea in late summer |
title_full_unstemmed |
Distributions of surface water CO2 and air-sea flux of CO2 in coastal regions of the Canadian Beaufort Sea in late summer |
title_sort |
distributions of surface water co2 and air-sea flux of co2 in coastal regions of the canadian beaufort sea in late summer |
publishDate |
2018 |
url |
https://doi.org/10.5194/bgd-5-5093-2008 https://www.biogeosciences-discuss.net/bgd-2008-0180/ |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Beaufort Sea |
genre_facet |
Arctic Arctic Ocean Beaufort Sea |
op_source |
eISSN: 1726-4189 |
op_relation |
doi:10.5194/bgd-5-5093-2008 https://www.biogeosciences-discuss.net/bgd-2008-0180/ |
op_doi |
https://doi.org/10.5194/bgd-5-5093-2008 |
_version_ |
1766345530594557952 |