Continuous 25-yr aerosol records at coastal Antarctica – I: inter-annual variability of ionic compounds and links to climate indices
Continuous 25-yr aerosol records at coastal Antarctica – I: inter-annual variability of ionic compounds and links to climate indices
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DOI：
10.1111/j.1600-0889.2011.00542.x
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发表时间：
2011-01
期刊：
影响因子：
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通讯作者：
R. Weller;D. Wagenbach;M. Legrand;C. Elsässer;X. Tian-Kunze;G. König‐Langlo
中科院分区：
文献类型：
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作者：
R. Weller;D. Wagenbach;M. Legrand;C. Elsässer;X. Tian-Kunze;G. König‐Langlo
基于连续25年的生物硫组分（甲磺酸盐和非海盐硫酸盐），海盐和硝酸盐的观测，在沿海南极Neumayer站（NM）的气溶胶气候学进行了研究。虽然只有硝酸盐可以检测到显着的长期趋势（1983年至1993年每年-3.6 ± 2.5%，1993年至2007年每年+4.0 ± 3.2%），但所有物种都具有2年至5年的非调和周期性。专门的时间序列分析表明，海冰范围和各种环流指数之间的关系充其量是微弱的，或者不显着。特别是，海冰范围和海盐负荷之间没有一致的联系是显而易见的，这表明只有一个相当本地的相关性的NM海盐记录。然而，较高的南方环形模式指数往往需要较低的生物硫信号。在检查NM的研究结果的空间均匀性，我们将其与各自的17年记录从沿海杜蒙德Urville站。我们发现了硝酸盐的类似长期趋势，这表明了一个舌状但无法识别的大气信号，尽管可以排除太阳活动或污染的任何重大影响。对于其他离子化合物，在多年尺度上没有明显的站点间变异。
The aerosol climatology at the coastal Antarctic Neumayer Station (NM) was investigated based on continuous, 25-yr long observations of biogenic sulphur components (methanesulfonate and non–sea salt sulphate), sea salt and nitrate. Although significant long-term trends could only be detected for nitrate (−3.6 ± 2.5% per year between 1983 and 1993 and +4.0 ± 3.2% per year from 1993–2007), non-harmonic periodicities between 2 and 5 yr were typical for all species. Dedicated time series analyses revealed that relations to sea ice extent and various circulation indices are weak at best or not significant. In particular, no consistent link between sea ice extent and sea salt loadings was evident suggesting only a rather local relevance of the NM sea salt record. Nevertheless, a higher Southern Annular Mode index tended to entail a lower biogenic sulphur signal. In examining the spatial uniformity of the NM findings we contrasted them to respective 17 yr records from the coastal Dumont d’Urville Station. We found similar long-term trends for nitrate, indicating an Antarctic-wide but not identifiable atmospheric signal, although any significant impact of solar activity or pollution could be ruled out. No inter-site variability on the multiannual scale was evident for the other ionic compounds.