An estimate of the impact of stratosphere‐to‐troposphere transport (STT) on the lower free tropospheric ozone over the Alps using 10Be and 7Be measurements
An estimate of the impact of stratosphere‐to‐troposphere transport (STT) on the lower free tropospheric ozone over the Alps using 10Be and 7Be measurements
复制标题
DOI：
10.1029/2002jd002604
复制
发表时间：
2003-06
影响因子：
--
通讯作者：
P. Zanis;E. Gerasopoulos;A. Priller;C. Schnabel;A. Stohl;C. Zerefos;H. Gäggeler;L. Tobler;P. Kubik;H. Kanter;H. Scheel;J. Luterbacher;M. Berger
中科院分区：
文献类型：
--
作者：
P. Zanis;E. Gerasopoulos;A. Priller;C. Schnabel;A. Stohl;C. Zerefos;H. Gäggeler;L. Tobler;P. Kubik;H. Kanter;H. Scheel;J. Luterbacher;M. Berger
瑞士Jungfraujoch （JUN）和德国Zugspitze （ZUG）。对10 Be/ 7 Be比值相对于10 Be、7 Be和相对湿度（RH）的变异性的检查表明，该比值与对两种放射性核素有明显影响的过程（如湿清除）无关。高比值通常在气旋或偏北平流条件下得到满足，这些天气条件主要与中欧上空的平流层到对流层输送（STT）事件有关，而10天的反轨迹表明，在10 Be/ 7 Be比值的前10%分位数内，大多数情况下都是平流层源。月度10be / 7be比率显示，5月和6月的峰值为JUN，而ZUG的季节性要弱得多。基于7be和10be的测量，使用一个简单的混合模型对全年的STT强度进行独立估计。尽管存在各种不确定性，但平流层臭氧百分比的贡献具有季节性循环特征，ZUG地区为早春最大值（3 ~ 11%），秋季最小值（1 ~ 2%），而JUN地区为5、6月一次最大值（6 ~ 18%），3月二次最大值（4 ~ 13%），秋季最小值（1 ~ 4%）。虽然本文采用的简单方法对STT对对流层下层的影响提供了一个独立的估计，但它与拉格朗日模式的计算结果，特别是对ZUG的计算结果显示出相对较好的一致性。索引术语：0341大气成分和结构：中间大气成分运输和化学；大气成分和结构：对流层成分和化学；大气成分和结构：对流层成分输送和化学；气象学和大气动力学：中尺度气象学；3362气象和大气动力学：平流层/对流层相互作用；关键词：平流层入侵，宇宙生成放射性核素，对流层臭氧，7 Be, 10 Be，阿尔卑斯山引文：Zanis， P.等，利用10 Be和7 Be测量估计平流层到对流层输送（STT）对阿尔卑斯山上空对流层低层自由臭氧的影响，J.地球物理学报。研究进展，108(D12), 8520, doi:10.1029/ 2002jd002604,2003。
Jungfraujoch (JUN), Switzerland and Zugspitze (ZUG), Germany. Inspection of the variability of the ratio 10 Be/ 7 Be in relation to 10 Be, 7 Be, and relative humidity (RH) reveals that the ratio is independent from processes that have a clear effect on both radionuclides, such as wet scavenging. High ratio values are generally met under cyclonic or northerly advective conditions, which are the synoptic situations mostly related to stratosphere-to-troposphere transport (STT) events over central Europe, while the 10-day back trajectories indicate a stratospheric source for the majority of the cases within the upper 10% quantile of 10 Be/ 7 Be ratios. The monthly 10 Be/ 7 Be ratios show a clear May and June peak at JUN and a much weaker seasonality at ZUG. A simple mixing model is used for an independent estimate of the strength of STT throughout the year based on the 7 Be and 10 Be measurements. In spite of the various uncertainties, the results indicate a seasonal cycle of stratospheric ozone percentage contribution with an early spring maximum (3– 11%) and autumn minimum (1–2%) at ZUG, while at JUN, a primary maximum in May and June (6–18%), a secondary maximum in March (4–13%), and a minimum again in autumn (1–4%) are revealed. Although the simple method applied here provides an independent estimate for the impact of STT to the lower troposphere, it nevertheless shows relatively good agreement with Lagrangian model calculations, especially for ZUG. INDEX TERMS: 0341 Atmospheric Composition and Structure: Middle atmosphere—constituent transport and chemistry (3334); 0365 Atmospheric Composition and Structure: Troposphere—composition and chemistry; 0368 Atmospheric Composition and Structure: Troposphere—constituent transport and chemistry; 3329 Meteorology and Atmospheric Dynamics: Mesoscale meteorology; 3362 Meteorology and Atmospheric Dynamics: Stratosphere/troposphere interactions; KEYWORDS: stratospheric intrusions, cosmogenic radionuclides, tropospheric ozone, 7 Be, 10 Be, Alps Citation: Zanis, P., et al., An estimate of the impact of stratosphere-to-troposphere transport (STT) on the lower free tropospheric ozone over the Alps using 10 Be and 7 Be measurements, J. Geophys. Res., 108(D12), 8520, doi:10.1029/2002JD002604, 2003.