Effects of freezing, growth, and ice cover on gas transport processes in laboratory seawater experiments
Effects of freezing, growth, and ice cover on gas transport processes in laboratory seawater experiments
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DOI：
10.1029/2008gl036318
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发表时间：
2009-03
影响因子：
5.2
通讯作者：
B. Loose;W. McGillis;P. Schlosser;D. Perovich;Taro Takahashi
中科院分区：
文献类型：
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作者：
B. Loose;W. McGillis;P. Schlosser;D. Perovich;Taro Takahashi
通过海冰进行的气体交换是极地海洋气候活跃气体预算的决定性因素。我们使用SF6和O2作为保守的气体示踪剂，观察水，冰和空气之间的传输条件下的冻结和部分冰覆盖人工海水。在冰的生长过程中，O2和SF6作为非极性溶质，以比盐更快的速度从冰中被排斥到下层水中。通过部分冰盖测量的气体交换率k超出了100%开阔水面（k100%）和完全冰盖之间线性缩放的预期：在15%开阔水面时，k为k100%的25%。这些结果表明，通过浮冰的气体净通量可能不会与开放水域面积成线性比例，因为冰下的循环过程影响气体交换速率。
Gas exchange through sea ice is a determining factor in the polar ocean budget of climatically‐active gases. We use SF6 and O2 as conservative gas tracers to observe transport between the water, ice and air during conditions of freezing and partial ice cover in artificial seawater. During ice growth, O2 and SF6, as non‐polar solutes, were rejected from the ice into the underlying water at a faster rate than that observed for salt. Measurements of the gas exchange rate, k, through partial ice cover exceeded that expected from linear scaling between 100% open water (k100%) and complete ice cover: at 15% open water, k was 25% of k100%. These results indicate that the net flux of gas through the ice pack may not scale linearly with open water area, as circulation processes under the ice affect the gas exchange rate.