20-Year Climatology of and Wet Deposition at Ny-Ålesund, Svalbard
20-Year Climatology of and Wet Deposition at Ny-Ålesund, Svalbard
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斯瓦尔巴特群岛新奥勒松 20 年气候学和湿沉积
DOI：
10.1155/2011/406508
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发表时间：
2011
影响因子：
2.9
通讯作者：
J. Ström
中科院分区：
文献类型：
--
作者：
R. Kühnel;T. Roberts;M. Björkman;E. Isaksson;W. Aas;K. Holmén;J. Ström
分析了斯瓦尔巴群岛Ny-Alesund 20年每周降水观测数据集，以评估氮的大气湿沉降。平均每年总氮沉降为74毫克N/（米2年），但表现出很大的年际变化，并占主导地位的高度情节性的“强”事件，可能是由欧洲来源的快速运输。大多数（90%）的降水样本被定义为“弱”（2毫克N/平方米），另外贡献高达225毫克N/（平方米年）。硝酸盐沉积主要发生在样品中的固体降水季节（9月16日至6月2日），铵沉积同样发生在固体和液体的季节。欧洲活性氮排放的趋势尚不确定，气候变化造成北大西洋气旋活动增加，可能导致斯瓦尔巴特群岛出现更强烈的沉积事件。
A 20-year dataset of weekly precipitation observations in Ny-Alesund, Svalbard, was analysed to assess atmospheric wet deposition of nitrogen. Mean annual total nitrogen deposition was 74 mg N/(m2 yr) but exhibited large interannual variability and was dominated by highly episodic “strong” events, probably caused by rapid transport from European sources. The majority (90%) of precipitation samples were defined as “weak” ( 2 mg N/m2) and additionally contributed up to 225 mg N/(m2 yr). Nitrate deposition largely occurred in samples within the solid-precipitation season (16 September–2 June), and ammonium deposition occurred equally in both solid and liquid seasons. Trends of reactive nitrogen emissions from Europe are uncertain, and increasing cyclonic activity over the North Atlantic caused by a changing climate might lead to more strong deposition events in Svalbard.