| Item type |
学術雑誌論文 / Journal Article(1) |
| 公開日 |
2013-11-11 |
| タイトル |
|
|
タイトル |
Methane efflux from bubbles suspended in ice-covered lakes in Syowa Oasis, East Antarctica |
|
言語 |
en |
| 言語 |
|
|
言語 |
eng |
| キーワード |
|
|
主題Scheme |
Other |
|
主題 |
Methane efflux |
| キーワード |
|
|
主題Scheme |
Other |
|
主題 |
Syowa Oasis |
| キーワード |
|
|
主題Scheme |
Other |
|
主題 |
East Antarctica |
| 資源タイプ |
|
|
資源 |
http://purl.org/coar/resource_type/c_6501 |
|
タイプ |
journal article |
| アクセス権 |
|
|
アクセス権 |
open access |
|
アクセス権URI |
http://purl.org/coar/access_right/c_abf2 |
| 著者 |
Sasaki, Masafumi
Imura, Satoshi
Kudoh, Sakae
Yamanouchi, Takashi
Morimoto, Shinji
Hashida, Gen
|
| 抄録 |
|
|
内容記述タイプ |
Abstract |
|
内容記述 |
This is the first estimation of methane efflux from bubbles in lake ice in Antarctica. Bubbles suspended in shallow ice in 20 lakes were observed as part of the operations of the 45th Japanese Antarctic Research Expedition in ice-free rocky areas along the eastern coast of Lutzow-Holm Bay (Syowa Oasis) in East Antarctica in 2004. Anomalous methane concentrations in bubbles suspended in lake ice and anomalous dissolved methane concentrations in lake water were frequently found. Methane concentrations in bubbles varied of five orders of magnitude, from 1.9 ppmv to 18% v/v. A procedure that makes estimations of methane flux from ice-bubbles possible has been developed, based on a relationship between bubble-density distribution, brightness observed by digital photographs and methane concentration in bubbles. Such a procedure applied to Lake Oyako Ike in the Skarvsnes area, where the maximum methane concentration was observed, suggests that total bubble volume is about 0.6% of ice volume and the mass of methane in bubbles in the lake is about 74 kg. Almost all gases in bubbles are released to the atmosphere in the early ice melt season (a period of a few weeks in December and January). By applying area fraction frequency distributions to methane concentration ranges for 20 lakes surveyed, extrapolation to the whole Syowa Oasis, including 110 lakes, would give a provisional estimate of total emission of about 2 tons-CH4/yr. |
| 書誌情報 |
Journal of Geophysical Research - Atmosphere
巻 114,
号 D18114,
p. 1-11,
発行日 2009-04
|
| DOI |
|
|
|
識別子タイプ |
DOI |
|
|
関連識別子 |
http://doi.org/10.1029/2009JD011849 |
| 出版者 |
|
|
出版者 |
American Geophysical Union (AGU) |
|
言語 |
en |
| 著者版フラグ |
|
|
言語 |
en |
|
値 |
author |
| 出版タイプ |
|
|
出版タイプ |
AM |
|
出版タイプResource |
http://purl.org/coar/version/c_ab4af688f83e57aa |
JGR-#1+(KIT-R).pdf (1.5 MB)
