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CO2 flux over young and snow-covered Arctic pack ice in winter and spring

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Title: CO2 flux over young and snow-covered Arctic pack ice in winter and spring
Authors: Nomura, Daiki Browse this author →KAKEN DB
Granskog, Mats A. Browse this author
Fransson, Agneta Browse this author
Chierici, Melissa Browse this author
Silyakova, Anna Browse this author
Ohshima, Kay I. Browse this author →KAKEN DB
Cohen, Lana Browse this author
Delille, Bruno Browse this author
Hudson, Stephen R. Browse this author
Dieckmann, Gerhard S. Browse this author
Issue Date: 5-Jun-2018
Publisher: Copernicus Publications
Journal Title: Biogeosciences
Volume: 15
Issue: 11
Start Page: 3331
End Page: 3343
Publisher DOI: 10.5194/bg-15-3331-2018
Abstract: Rare CO2 flux measurements from Arctic pack ice show that two types of ice contribute to the release of CO2 from the ice to the atmosphere during winter and spring: young, thin ice with a thin layer of snow and older (several weeks), thicker ice with thick snow cover. Young, thin sea ice is characterized by high salinity and high porosity, and snow-covered thick ice remains relatively warm (> -7.5 degrees C) due to the insulating snow cover despite air temperatures as low as -40 degrees C. Therefore, brine volume fractions of these two ice types are high enough to provide favorable conditions for gas exchange between sea ice and the atmosphere even in mid-winter. Although the potential CO2 flux from sea ice decreased due to the presence of the snow, the snow surface is still a CO2 source to the atmosphere for low snow density and thin snow conditions. We found that young sea ice that is formed in leads without snow cover produces CO2 fluxes an order of magnitude higher than those in snow-covered older ice (+1.0 +/- 0.6 mmol Cm-2 day(-1) for young ice and +0.2 +/- 0.2 mmol Cm-2 day(-1) for older ice).
Type: article
Appears in Collections:国際連携研究教育局 : GI-CoRE (Global Institution for Collaborative Research and Education : GI-CoRE) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 野村 大樹

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