OXYGEN SUPERSATURATION IN ICE-COVERED ANTARCTIC LAKES - BIOLOGICAL VERSUS PHYSICAL CONTRIBUTIONS

被引:69
作者
CRAIG, H
WHARTON, RA
MCKAY, CP
机构
[1] UNIV NEVADA SYST,DESERT RES INST,RENO,NV 89506
[2] NASA,AMES RES CTR,DIV SPACE SCI,MOFFETT FIELD,CA 94035
关键词
D O I
10.1126/science.11539819
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
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, white 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.
引用
收藏
页码:318 / 321
页数:4
相关论文
共 9 条
  • [1] BALL DG, 1960, GEOL SOC AM BULL, V71, P1703, DOI 10.1130/0016-7606(1960)71[1703:SLADBM]2.0.CO
  • [2] 2
  • [3] OXYGEN SUPERSATURATION IN THE OCEAN - BIOLOGICAL VERSUS PHYSICAL CONTRIBUTIONS
    CRAIG, H
    HAYWARD, T
    [J]. SCIENCE, 1987, 235 (4785) : 199 - 202
  • [4] GREEN W, IN PRESS ANTARCTIC R
  • [5] THICKNESS OF ICE ON PERENNIALLY FROZEN LAKES
    MCKAY, CP
    CLOW, GD
    WHARTON, RA
    SQUYRES, SW
    [J]. NATURE, 1985, 313 (6003) : 561 - 562
  • [6] ON THE DISSOLVED SURFACE OXYGEN SUPERSATURATION IN THE ARCTIC
    TOP, Z
    MARTIN, S
    BECKER, P
    [J]. GEOPHYSICAL RESEARCH LETTERS, 1985, 12 (12) : 821 - 823
  • [7] SOLUBILITY OF NITROGEN, OXYGEN AND ARGON IN WATER AND SEAWATER
    WEISS, RF
    [J]. DEEP-SEA RESEARCH, 1970, 17 (04): : 721 - &
  • [8] PERENNIAL N-2 SUPERSATURATION IN AN ANTARCTIC LAKE
    WHARTON, RA
    MCKAY, CP
    MANCINELLI, RL
    SIMMONS, GM
    [J]. NATURE, 1987, 325 (6102) : 343 - 345
  • [9] OXYGEN BUDGET OF A PERENNIALLY ICE-COVERED ANTARCTIC LAKE
    WHARTON, RA
    MCKAY, CP
    SIMMONS, GM
    PARKER, BC
    [J]. LIMNOLOGY AND OCEANOGRAPHY, 1986, 31 (02) : 437 - 443