Post-depositional modification of NO-3 in snow layers at EastAntarctica and at the headwater of ürumqi River

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Post-depositional modification of NO-3 in snow layers at EastAntarctica and at the headwater of ürumqi River

机译：南极东部和乌鲁木齐河源头雪层中NO-3的沉积后改性

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Acidic species, such as Nitrate, in polar snow and firn layers are “reversibly” deposited, and are sufficiently volatile to undergo significant postdepositional exchange between snow/firn and the atmosphere. Through comparison of the snowpit and snowpack nitrate concentrations from central East Antarctica and the headwater of ürumqi River, we conclude that the nitrate peaks in the uppermost surface snow layers in central Antarctica are not related to an atmospheric signal and must account for post-depositional effects. Such effects, however, are not found in the surface snowpack nitrate profiles from the headwater of ürumqi River. Two reasons may account for the post-depositional difference. At first, nitrate in the polar snow and firn layers appears to be hydrated ion, which can be taken up by the atmosphere, while at the headwater of ürumqi River it seems mainly as mineral ion, which assembles the behavior of aerosol-derived species that are “irreversibly” deposited and do not undergo significant post-depositional exchange with the atmosphere. Secondly, the chemical features of the snow and ice on the Antarctica are mainly determined by wet deposition, to the contrary, dry deposition is more significant at the headwater of lUrumqi River than that on the East Antarctic Plateau.

机译：极性雪和杉木层中的酸性物质（例如硝酸盐）被“可逆”沉积，并且具有足够的挥发性，可以在雪/杉木与大气之间进行大量的沉积后交换。通过比较南极东部中部地区和乌鲁木齐河上游水域的雪坑和积雪堆中的硝酸盐浓度，我们得出结论，南极中部最表层雪层中的硝酸盐峰值与大气信号无关，必须考虑到沉积后的影响。但是，在乌鲁木齐河源头的地表积雪硝酸盐剖面中未发现这种影响。沉积后的差异可能有两个原因。起初，极地雪和杉木层中的硝酸盐似乎是水合离子，可以被大气吸收，而在乌鲁木齐河的源头，它似乎主要是矿物质离子，它集合了气溶胶衍生物种的行为，是“不可逆转地”沉积的，并且不会与大气进行大量的沉积后交换。其次，南极冰雪的化学特征主要取决于湿沉降，相反，乌鲁木齐河源头的干沉降比南极东部的干沉降更为重要。

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《极地科学进展(英文版)》 |2000年第1期|18-24|共7页
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Laboratory of Ice Core and Cold Regions Environment, LIGG, CAS, Lanzhou 730000, China;

Laboratory of Ice Core and Cold Regions Environment, LIGG, CAS, Lanzhou 730000, China;

Laboratory of Ice Core and Cold Regions Environment, LIGG, CAS, Lanzhou 730000, China;

Laboratory of Ice Core and Cold Regions Environment, LIGG, CAS, Lanzhou 730000, China;

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正文语种 chi
中图分类自然地理学;
关键词
NO-3, surface snowpack, depositional processes, East Antarctica, theheadwater of ürumqi River;

机译：NO-3;地表积雪;沉积过程;南极东部;乌鲁木齐河源头;

Post-depositional modification of NO-3 in snow layers at EastAntarctica and at the headwater of ürumqi River

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