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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >The influence of the atmosphere-snow-ice-ocean interactions on the levels of hexachlorocyclohexanes in the Arctic cryosphere
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The influence of the atmosphere-snow-ice-ocean interactions on the levels of hexachlorocyclohexanes in the Arctic cryosphere

机译：大气-冰雪-海洋相互作用对北极冰冻圈六氯环己烷含量的影响

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摘要

The a- and γ-hexachlorocyclohexanes (HCHs) are being scavenged from the atmosphere by falling snow, with the average total scavenging ratios (W_T) of 3.8 x 10~4 and 9.6 x 10~3, respectively. After deposition, HCH snow concentrations can decrease by 40% because of snowpack ventilation and increase by 50% because of upward migration of brine from the ice. HCH vertical distribution in sufficiently cold winter sea ice, which maintains brine volume fractions <5%, reflects the ice growth history. Initially, the entrapment of brine (and HCHs) in ice depends on the rates of ice growth and desalination. However, after approximately the first week of ice formation, ice growth rate becomes dominant. Deviations of HCH concentrations from the values predicted by the ice bulk salinity (rate of brine entrapment) can be explained by spatial variability of HCHs in surface water. HCH burden in the majority of the ice column remains locked throughout most of the season until the early spring when snow meltwater percolates into the ice, delivering HCHs to the upper ocean via desalination by flushing. Percolation can lead to an increase in a- and γ-HCH in the sea ice by up to 2%-18% and 4%-32%, respectively.
机译：降雪清除了大气中的α-和γ-六氯环己烷（HCHs），平均总清除率（W_T）分别为3.8 x 10〜4和9.6 x 10〜3。沉积后，由于积雪的通风，六氯环己烷的雪浓度可以降低40％，而由于盐水从冰中向上迁移，其浓度可以升高50％。在足够寒冷的冬季海冰中，六氯环己烷的垂直分布使盐水体积分数保持在5％以下，反映了冰的生长历史。最初，盐水（和六氯环己烷）在冰中的捕集取决于冰的生长和脱盐速度。但是，大约在结冰的第一周后，结冰速度就占主导地位。六氯环己烷浓度与冰体积盐度（盐水夹带率）预测的值之间的偏差可以用地表水中六氯环己烷的空间变异性来解释。在整个季节的大部分时间内，大部分冰柱中的六氯环己烷负担一直保持锁定，直到初春时，融雪融化的水渗入冰中，通过冲淡海水将六氯环己烷输送到上层海洋。渗滤可导致海冰中的六氯环己烷和γ-六氯环己烷分别增加多达2％-18％和4％-32％。

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