Publication Date:
1992-01-17
Description:
Freezing in ice-covered lakes causes dissolved gases to become supersaturated while at the same time removing gases trapped in the ablating ice cover. Analysis of N2, O2, and Ar in bubbles from Lake Hoare ice shows that, while O2 is approximately 2.4 times supersaturated in the water below the ice, only 11% of the O2 input to this lake is due to biological activity: 89% of the O2 is derived from meltwater inflow. Trapped bubbles in a subliming ice cover provide a natural "fluxmeter" for gas exchange: in Lake Hoare as much as 70% of the total gas loss may occur by advection through the ice cover, including approximately 75% of the N2, approximately 59% of the O2, and approximately 57% of the Ar losses. The remaining gas fractions are removed by respiration at the lower boundary (O2) and by molecular exchange with the atmosphere in the peripheral summer moat around the ice.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Craig, H -- Wharton, R A Jr -- McKay, C P -- DP84-16340/DP/NCCDPHP CDC HHS/ -- etc. -- New York, N.Y. -- Science. 1992 Jan 17;255:318-21.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Scripps Institution of Oceanography, University of California at San Diego, La Jolla 92093, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11539819" target="_blank"〉PubMed〈/a〉
Keywords:
Antarctic Regions
;
Argon/analysis
;
Atmosphere
;
*Cold Climate
;
Eukaryota
;
*Fresh Water
;
*Ice
;
Mars
;
Models, Chemical
;
Nitrogen/analysis
;
Oxygen/*analysis
;
Photosynthesis
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
Permalink
