222Rn and 226Ra: indicators of sea-ice effects on air-sea gas exchange
222 Rn and 226Ra distributions beneath the sea ice of the Barents Sea revealed that ice cover has varied effects on air-sea gas exchange. Twice, once in late summer and once in late winter, seawater samples from the top meter below drill holes had 222Rn activities that were not lower than their 226,...
Published in: | Polar Research |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Norwegian Polar Institute
1991
|
Subjects: | |
Online Access: | https://polarresearch.net/index.php/polar/article/view/2298 https://doi.org/10.3402/polar.v10i1.6727 |
id |
ftjpolarres:oai:journals.openacademia.net:article/2298 |
---|---|
record_format |
openpolar |
spelling |
ftjpolarres:oai:journals.openacademia.net:article/2298 2023-05-15T15:38:56+02:00 222Rn and 226Ra: indicators of sea-ice effects on air-sea gas exchange Fanning, Kent A. Torres, Linda M. 1991-01-09 application/pdf https://polarresearch.net/index.php/polar/article/view/2298 https://doi.org/10.3402/polar.v10i1.6727 eng eng Norwegian Polar Institute https://polarresearch.net/index.php/polar/article/view/2298/5548 https://polarresearch.net/index.php/polar/article/view/2298 doi:10.3402/polar.v10i1.6727 Copyright (c) 2018 Polar Research Polar Research; Vol. 10 No. 1: Special issue: Proceedings of the Pro Mare Symposium on Polar Marine Ecology. Part 1; 51-58 1751-8369 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1991 ftjpolarres https://doi.org/10.3402/polar.v10i1.6727 2021-11-11T19:12:21Z 222 Rn and 226Ra distributions beneath the sea ice of the Barents Sea revealed that ice cover has varied effects on air-sea gas exchange. Twice, once in late summer and once in late winter, seawater samples from the top meter below drill holes had 222Rn activities that were not lower than their 226,Ra activities, indicating the existence of secular equilibrium and a negligible net exchange of 222Rn and other gases with the atmosphere. However, seawater in the upper 20-85 m usually exhibited at least some 222Rn depletion; 222Rn-to-226Ra activity ratios tended to have ‘ice-free’ values (0.3-0.9) in the summer and values between 0.9 and 1.0 in the winter. Integrated 222Rn depletions and piston velocities in both seasons typically fell in the lower 25% of the ranges for ice-free seawater, suggesting that a moderate but far from total reduction in gas exchange is normally caused by ice cover and/or meltwater. The results demonstrate that sea-ice interference with the oceanic uptake of atmospheric gases such as CO, is not well understood and needs further investigation. Article in Journal/Newspaper Barents Sea Polar Research Sea ice Polar Research (E-Journal) Barents Sea Polar Research 10 1 51 58 |
institution |
Open Polar |
collection |
Polar Research (E-Journal) |
op_collection_id |
ftjpolarres |
language |
English |
description |
222 Rn and 226Ra distributions beneath the sea ice of the Barents Sea revealed that ice cover has varied effects on air-sea gas exchange. Twice, once in late summer and once in late winter, seawater samples from the top meter below drill holes had 222Rn activities that were not lower than their 226,Ra activities, indicating the existence of secular equilibrium and a negligible net exchange of 222Rn and other gases with the atmosphere. However, seawater in the upper 20-85 m usually exhibited at least some 222Rn depletion; 222Rn-to-226Ra activity ratios tended to have ‘ice-free’ values (0.3-0.9) in the summer and values between 0.9 and 1.0 in the winter. Integrated 222Rn depletions and piston velocities in both seasons typically fell in the lower 25% of the ranges for ice-free seawater, suggesting that a moderate but far from total reduction in gas exchange is normally caused by ice cover and/or meltwater. The results demonstrate that sea-ice interference with the oceanic uptake of atmospheric gases such as CO, is not well understood and needs further investigation. |
format |
Article in Journal/Newspaper |
author |
Fanning, Kent A. Torres, Linda M. |
spellingShingle |
Fanning, Kent A. Torres, Linda M. 222Rn and 226Ra: indicators of sea-ice effects on air-sea gas exchange |
author_facet |
Fanning, Kent A. Torres, Linda M. |
author_sort |
Fanning, Kent A. |
title |
222Rn and 226Ra: indicators of sea-ice effects on air-sea gas exchange |
title_short |
222Rn and 226Ra: indicators of sea-ice effects on air-sea gas exchange |
title_full |
222Rn and 226Ra: indicators of sea-ice effects on air-sea gas exchange |
title_fullStr |
222Rn and 226Ra: indicators of sea-ice effects on air-sea gas exchange |
title_full_unstemmed |
222Rn and 226Ra: indicators of sea-ice effects on air-sea gas exchange |
title_sort |
222rn and 226ra: indicators of sea-ice effects on air-sea gas exchange |
publisher |
Norwegian Polar Institute |
publishDate |
1991 |
url |
https://polarresearch.net/index.php/polar/article/view/2298 https://doi.org/10.3402/polar.v10i1.6727 |
geographic |
Barents Sea |
geographic_facet |
Barents Sea |
genre |
Barents Sea Polar Research Sea ice |
genre_facet |
Barents Sea Polar Research Sea ice |
op_source |
Polar Research; Vol. 10 No. 1: Special issue: Proceedings of the Pro Mare Symposium on Polar Marine Ecology. Part 1; 51-58 1751-8369 |
op_relation |
https://polarresearch.net/index.php/polar/article/view/2298/5548 https://polarresearch.net/index.php/polar/article/view/2298 doi:10.3402/polar.v10i1.6727 |
op_rights |
Copyright (c) 2018 Polar Research |
op_doi |
https://doi.org/10.3402/polar.v10i1.6727 |
container_title |
Polar Research |
container_volume |
10 |
container_issue |
1 |
container_start_page |
51 |
op_container_end_page |
58 |
_version_ |
1766370365419814912 |