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酸性气体成分（如ＮＯ－３）的强挥发性导致其在雪面沉降后，具有沉积后气／雪交换作用，即其在表层雪内是“可逆”沉降的。通过比较东南极内陆雪坑的ＮＯ－３剖面和乌鲁木齐河源１号冰川表层雪内ＮＯ－３的浓度变化，认为沉积后气／雪交换作用在东南极内陆较显著，而在乌鲁木齐河源１号冰川则不然。表层雪内ＮＯ－３存在方式的不同和沉降机制的差异应是导致两地ＮＯ－３沉积后过程差异的原因所在。
The strong volatility of acidic gas components (such as NO-3) leads to post-deposition gas / snow exchange after it settles in the snow, ie, it “reversibly” settles within the surface snow. By comparing the NO-3 profile of snow pits in the southeast Antarctic with the changes of NO-3 concentrations in surface snow of glacier No. 1 in the source bank of Urumqi, it is considered that the post-deposition gas / snow exchange effect is more pronounced in the inland of the southeast Antarctica. However, Glacier is not. The difference of NO-3 existing in surface snow and the mechanism of sedimentation should be the reason of the difference of NO-3 deposition process between two places.