Many long-term air pollution and climate monitoring stations face the issue of increasing anthropogenic activities in their vicinity. Furthermore, the spatial representativeness of the sites is often not entirely understood especially in mountainous terrain with complex topographic features. This study presents a 5-year comparison of parallel aerosol measurements (total particle number concentration and equivalent black carbon mass concentration) at the Jungfraujoch in the Swiss Alps (JFJ, 3580 m a.s.l.), and an adjacent mountain ridge, the Jungfrau East Ridge (JER, 3705 m a.s.l.), in 1000 m air-line distance to the main site. The parallel aerosol measurements reveal characteristic differences in the diurnal variations between the two sites under certain specific meteorological conditions. Our analysis estimates that on 20%–40% of the days local activities at the Jungfraujoch have a clear influence on the measured time series of the total aerosol number concentration and the equivalent black carbon mass concentration. This influence is mainly seen in form of strong isolated spikes rather than by an increase in the on-site background concentration. They can thus be flagged during the data quality assurance process and filtered from those measurement parameters available at high time resolution. Removing the spikes from the original time series results in daily mean values for the total aerosol number concentration and equivalent black carbon mass concentration that are 5%–10% lower compared to the original signals. During nighttime with hardly any local pollution sources that cause spikes this percentage decreases towards 0%. The signal baselines at the Jungfraujoch and Jungfrau East Ridge correlate well during more than 50% of the days.

许多长期空气污染和气候监测站都面临着附近人为活动增加的问题。此外，站点的空间代表性通常并不完全被理解，尤其是在具有复杂地形特征的山区。本研究对瑞士阿尔卑斯山的少女峰（JFJ，海拔 3580 米）和邻近的山脊少女峰东山脊（Jungfrau East Ridge）的平行气溶胶测量（总粒子数浓度和等效黑碳质量浓度）进行了 5 年比较。 JER, 3705 m asl)，距主站点 1000 m 的空中距离。平行气溶胶测量揭示了在某些特定气象条件下两个站点之间昼夜变化的特征差异。我们的分析估计，在少女峰 20%–40% 的日子里，当地活动对总气溶胶数浓度和等效黑碳质量浓度的测量时间序列有明显影响。这种影响主要表现为强烈的孤立尖峰，而不是现场背景浓度的增加。因此，它们可以在数据质量保证过程中被标记出来，并从那些以高时间分辨率可用的测量参数中过滤出来。从原始时间序列中去除尖峰会导致总气溶胶数浓度和等效黑碳质量浓度的日平均值比原始信号低 5%–10%。在几乎没有任何本地污染源导致峰值的夜间，这个百分比下降到 0%。