Correction to “Estimation of mixing in the troposphere from Lagrangian trace gas reconstructions during long-range pollution plume transport”
Correction to “Estimation of mixing in the troposphere from Lagrangian trace gas reconstructions during long-range pollution plume transport”
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DOI：
10.1029/2009jd013545
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发表时间：
2009-10
影响因子：
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通讯作者：
I. Pisso;E. Real;K. Law;B. Legras;N. Bousserez;J. Attié;H. Schlager
中科院分区：
文献类型：
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作者：
I. Pisso;E. Real;K. Law;B. Legras;N. Bousserez;J. Attié;H. Schlager
为了估计分层流动条件下自由对流层中的湍流扩散系数，利用扩散后向轨迹集合研究了污染物羽流在北大西洋长距离输送过程中的扩散和混合。推导出垂直扩散系数dv和水平扩散系数dh分别为0.3-1 m2 s−1和1 × 104 m2 s−1数量级。讨论了与该方法有关的不确定性，并将结果与以前对大气混合率的估计进行了比较。这些扩散率估计也产生对流层中示踪结构的垂直/水平长宽比的估计。本案例研究的结果用于估计准确模拟污染物洲际输送所需的网格分辨率，其垂直方向约为500米，水平方向至少为40公里。这项工作形成了高分辨率化学模拟的基础，利用扩散向后轨迹的集合。
The dispersion and mixing of pollutant plumes during long-range transport across the North Atlantic is studied using ensembles of diffusive backward trajectories in order to estimate turbulent diffusivity coefficients in the free troposphere under stratified flow conditions. Values of the order of 0.3-1 m2 s−1 and 1 × 104 m2 s−1 for the vertical and horizontal diffusivity coefficients D v and D h , respectively, are derived. Uncertainties related to the method are discussed, and results are compared with previous estimates of atmospheric mixing rates. These diffusivity estimates also yield an estimate of the vertical/horizontal aspect ratio of tracer structures in the troposphere. Results from this case study are used to estimate grid resolutions needed to accurately simulate the intercontinental transport of pollutants as being of the order of 500 m in the vertical and at least 40 km in the horizontal. This work forms the basis of high-resolution chemical simulations using ensembles of diffusive backward trajectories.