Hypersaline “wet patches” in Taylor Valley, Antarctica
Hypersaline “wet patches” in Taylor Valley, Antarctica
复制标题
南极洲泰勒谷的高盐“湿地”
DOI：
10.1029/2012gl050898
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发表时间：
2012
影响因子：
5.2
通讯作者：
W. Lyons
中科院分区：
文献类型：
--
作者：
J. Levy;A. Fountain;K. Welch;W. Lyons
位于南极洲麦克默多干燥山谷泰勒谷的空间孤立的土壤斑块，是盐分含量和土壤湿度升高的地点。在南极的春季，在没有积雪融化的情况下，地表出现了明显潮湿(反照率降低)的土块。土壤孔隙流体是高盐分的，平均水活度为0.74(溶液的水活度决定了该溶液的平衡蒸汽压)，比干燥山谷中的平均土壤盐分高一个数量级。这些盐碱地的水分含量是普通土壤的3-5倍。地球化学和气象分析表明，这些湿润斑块是直接进入土壤孔隙流体的水蒸气侵位地点，最终可能来自土壤盐类的潮解。这些潮湿的斑块代表了进入南极永久冻土层的水的非降水、非地下水来源。
Spatially isolated patches of soil located in Taylor Valley, McMurdo Dry Valleys, Antarctica, are sites of elevated salt content and soil moisture. During Antarctic spring, in the absence of snow melt, visibly wet (reduced albedo) patches of soil are present at the surface. The soil pore fluids are hypersaline and have average water activity of 0.74 (the water activity of a solution determines the equilibrium vapor pressure of that solution), and are an order of magnitude more saline than average soils in the Dry Valleys. These salty soils are 3–5 times more water rich than average soils. Geochemical and meteorological analyses show that these wet patches are sites of direct vapor emplacement into soil pore fluids that may ultimately be sourced by the deliquescence of soil salts. These wet patches represent a non‐precipitation, non‐groundwater source for water into Antarctic permafrost.