Explaining global patterns of microbarom observations with wave action models
Explaining global patterns of microbarom observations with wave action models
复制标题
用波浪作用模型解释微气压观测的全局模式
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
M. Campillo
中科院分区：
文献类型：
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作者：
M. Landès;A. Pichon;N. Shapiro;G. Hillers;M. Campillo
摘要我们提出了一种在全球范围内模拟微气压探测的时空变化的方法。我们的模型结合了由非线性海浪相互作用产生的源项和通过平流层波导的远距离次声传播的简化描述。我们将模型预测与2008年至2009年国际监测系统次声观测站的观测值进行了比较。我们的结果表明，大多数台站的微气压后方位角探测的观测趋势和模拟趋势之间存在fi一阶一致性。考虑到平流层风对次声传播的影响，模型系统地改善了观测之间的fit。然而，正确地预测探测的周变化模式被证明是更具挑战性的，并且需要进一步改进源和传播模型。然后，可以根据这项研究中制定的指标进行短期和区域量化比较。
SUMMARY We present a methodology to model the spatio-temporal variations of microbarom detections at a global scale. Our model combines the source term resulting from the non-linear ocean-wave interaction and a simplified description of the long-range infrasound propagation through the stratospheric waveguide. We compare model predictions with observations at infrasound stations of the International Monitoring System between 2008 and 2009. Our results show a first-order consistency between the observed and modelled trends of microbarom backazimuth detections for most stations. Taking into account stratospheric wind effect on the infrasound propagation systematically improves the fit between the observations the model predictions. However, correctly predicting patterns of weekly variation of detections turns out to be more challenging and would require further improving the source and the propagation models. Short-term and regional quantitative comparisons could then be carried out based on the metrics developed in this study.