Spatial and temporal distribution of environmental markers from Coastal to Plateau areas in Antarctica by firn core chemical analysis
Spatial and temporal distribution of environmental markers from Coastal to Plateau areas in Antarctica by firn core chemical analysis
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DOI：
10.1080/03067310310001640393
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发表时间：
2004-05
影响因子：
2.6
通讯作者：
R. Traversi;S. Becagli;E. Castellano;O. Largiuni;A. Migliori;M. Severi;M. Frezzotti;R. Udisti
中科院分区：
文献类型：
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作者：
R. Traversi;S. Becagli;E. Castellano;O. Largiuni;A. Migliori;M. Severi;M. Frezzotti;R. Udisti
对在维多利亚州北部沿海和高原地区以及从塔洛斯穹顶到穹顶C(东南极洲，太平洋部分)的一条横断面上取样的浅雪岩芯进行的化学分析，使人们得以全面了解过去100年来雪沉积化学成分的时空变化。观测和讨论了初级(海雾)和次级(生物排放，大气输入)源标志浓度的变化，作为离海距离和海拔的函数。在积雪速率相对较高的站点，亚采样分辨率足以利用季节标志物的周期性变化获得地层年龄。在这些测站中，对“夏季”和“冬季”样本进行了细分，以研究所测化合物对雪成分的贡献随海拔和离海距离的增加而发生的季节变化。在积累率较低的站点，观察到了一些能够改变氯化物和硝酸盐原始沉积的沉积后效应的证据。还讨论了这些物质的深度/浓度剖面用于恢复过去沉积的可靠性。
The chemical analysis of shallow firn cores sampled in coastal and plateau areas in Northern Victoria Land and along a transect from Talos Dome to Dome C (East Antarctica, Pacific Ocean sector) allowed a global view of spatial and temporal changes in chemical composition of snow depositions over the last 100 years. Variations in concentration of primary (sea spray) and secondary (biogenic emission, atmospheric inputs) source markers were observed and discussed as a function of distance from the sea and altitude. In the stations characterized by relatively high snow accumulation rates, the sub-sampling resolution was sufficient to obtain a stratigraphic dating by using the periodical variations of seasonal markers. In these stations, a subdivision in “summer” and “winter” samples was carried out in order to study the seasonal changes of the contributions of the measured compounds to the snow composition as elevation and distance from the sea increase. Some evidence of post-depositional effects which are able to change the original deposition of chloride and nitrate, was observed at stations with low accumulation rates. The reliability of the depth/concentration profile of these substances for reconstructing past deposition was also discussed.