Rapid physically driven inversion of the air-sea ice CO2 flux in the seasonal landfast ice off Barrow, Alaska after onset of surface melt
The air-sea ice CO2 flux was measured over landfast sea ice in the Chukchi Sea, off Barrow, Alaska in late May 2008 with a chamber technique. The ice cover transitioned from a cold early spring to a warm late spring state, with an increase in air temperature and incipient surface melt. During melt,...
Published in: | Continental Shelf Research |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Elsevier
|
Subjects: | |
Online Access: | http://hdl.handle.net/2115/44792 https://doi.org/10.1016/j.csr.2010.09.014 |
id |
fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/44792 |
---|---|
record_format |
openpolar |
spelling |
fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/44792 2023-05-15T15:09:32+02:00 Rapid physically driven inversion of the air-sea ice CO2 flux in the seasonal landfast ice off Barrow, Alaska after onset of surface melt Nomura, Daiki Eicken, Hajo Gradinger, Rolf Shirasawa, Kunio http://hdl.handle.net/2115/44792 https://doi.org/10.1016/j.csr.2010.09.014 eng eng Elsevier http://hdl.handle.net/2115/44792 Continental Shelf Research, 30(19): 1998-2004 http://dx.doi.org/10.1016/j.csr.2010.09.014 Sea ice Brine CO2 flux pCO2 Chukchi sea Arctic ocean 452 article (author version) fthokunivhus https://doi.org/10.1016/j.csr.2010.09.014 2022-11-18T01:02:07Z The air-sea ice CO2 flux was measured over landfast sea ice in the Chukchi Sea, off Barrow, Alaska in late May 2008 with a chamber technique. The ice cover transitioned from a cold early spring to a warm late spring state, with an increase in air temperature and incipient surface melt. During melt, brine salinity and brine dissolved inorganic carbon concentration (DIC) decreased from 67.3 to 18.7 and 3977.6 to 1163.5 μmol kg^[-1], respectively. In contrast, the salinity and DIC of under-ice water at depths of 3 and 5 m below the ice surface remained almost constant with average values of 32.4 ± 0.3 (standard deviation) and 2163.1 ± 16.8 μmol kg^[-1], respectively. The air-sea ice CO2 flux decreased from +0.7 to -1.0 mmol m^[-2] day^[-1] (where a positive value indicates CO2 being released to the atmosphere from the ice surface). During this early to late spring transition, brought on by surface melt, sea ice shifted from a source to a sink for atmospheric CO2, with a rapid decrease of brine DIC likely associated with a decrease in the partial pressure of CO2 of brine from a supersaturated to an undersaturated state compared to the atmosphere. Formation of superimposed ice coincident with melt was not sufficient to shut down ice-air gas exchange. Article in Journal/Newspaper Arctic Arctic Ocean Barrow Chukchi Chukchi Sea Sea ice Alaska Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Arctic Arctic Ocean Chukchi Sea Continental Shelf Research 30 19 1998 2004 |
institution |
Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
Sea ice Brine CO2 flux pCO2 Chukchi sea Arctic ocean 452 |
spellingShingle |
Sea ice Brine CO2 flux pCO2 Chukchi sea Arctic ocean 452 Nomura, Daiki Eicken, Hajo Gradinger, Rolf Shirasawa, Kunio Rapid physically driven inversion of the air-sea ice CO2 flux in the seasonal landfast ice off Barrow, Alaska after onset of surface melt |
topic_facet |
Sea ice Brine CO2 flux pCO2 Chukchi sea Arctic ocean 452 |
description |
The air-sea ice CO2 flux was measured over landfast sea ice in the Chukchi Sea, off Barrow, Alaska in late May 2008 with a chamber technique. The ice cover transitioned from a cold early spring to a warm late spring state, with an increase in air temperature and incipient surface melt. During melt, brine salinity and brine dissolved inorganic carbon concentration (DIC) decreased from 67.3 to 18.7 and 3977.6 to 1163.5 μmol kg^[-1], respectively. In contrast, the salinity and DIC of under-ice water at depths of 3 and 5 m below the ice surface remained almost constant with average values of 32.4 ± 0.3 (standard deviation) and 2163.1 ± 16.8 μmol kg^[-1], respectively. The air-sea ice CO2 flux decreased from +0.7 to -1.0 mmol m^[-2] day^[-1] (where a positive value indicates CO2 being released to the atmosphere from the ice surface). During this early to late spring transition, brought on by surface melt, sea ice shifted from a source to a sink for atmospheric CO2, with a rapid decrease of brine DIC likely associated with a decrease in the partial pressure of CO2 of brine from a supersaturated to an undersaturated state compared to the atmosphere. Formation of superimposed ice coincident with melt was not sufficient to shut down ice-air gas exchange. |
format |
Article in Journal/Newspaper |
author |
Nomura, Daiki Eicken, Hajo Gradinger, Rolf Shirasawa, Kunio |
author_facet |
Nomura, Daiki Eicken, Hajo Gradinger, Rolf Shirasawa, Kunio |
author_sort |
Nomura, Daiki |
title |
Rapid physically driven inversion of the air-sea ice CO2 flux in the seasonal landfast ice off Barrow, Alaska after onset of surface melt |
title_short |
Rapid physically driven inversion of the air-sea ice CO2 flux in the seasonal landfast ice off Barrow, Alaska after onset of surface melt |
title_full |
Rapid physically driven inversion of the air-sea ice CO2 flux in the seasonal landfast ice off Barrow, Alaska after onset of surface melt |
title_fullStr |
Rapid physically driven inversion of the air-sea ice CO2 flux in the seasonal landfast ice off Barrow, Alaska after onset of surface melt |
title_full_unstemmed |
Rapid physically driven inversion of the air-sea ice CO2 flux in the seasonal landfast ice off Barrow, Alaska after onset of surface melt |
title_sort |
rapid physically driven inversion of the air-sea ice co2 flux in the seasonal landfast ice off barrow, alaska after onset of surface melt |
publisher |
Elsevier |
url |
http://hdl.handle.net/2115/44792 https://doi.org/10.1016/j.csr.2010.09.014 |
geographic |
Arctic Arctic Ocean Chukchi Sea |
geographic_facet |
Arctic Arctic Ocean Chukchi Sea |
genre |
Arctic Arctic Ocean Barrow Chukchi Chukchi Sea Sea ice Alaska |
genre_facet |
Arctic Arctic Ocean Barrow Chukchi Chukchi Sea Sea ice Alaska |
op_relation |
http://hdl.handle.net/2115/44792 Continental Shelf Research, 30(19): 1998-2004 http://dx.doi.org/10.1016/j.csr.2010.09.014 |
op_doi |
https://doi.org/10.1016/j.csr.2010.09.014 |
container_title |
Continental Shelf Research |
container_volume |
30 |
container_issue |
19 |
container_start_page |
1998 |
op_container_end_page |
2004 |
_version_ |
1766340704023347200 |