Localization of microbarom sources using the IMS infrasound network
Localization of microbarom sources using the IMS infrasound network
复制标题
使用 IMS 次声网络定位微气压源
DOI：
10.1029/2011jd016684
复制
发表时间：
2012
影响因子：
--
通讯作者：
R. Matoza
中科院分区：
文献类型：
--
作者：
M. Landès;L. Ceranna;A. Pichon;R. Matoza
[1]利用全球国际监测系统(IMS)进行的多年连续次声监测表明，在赤道、中纬度和高纬度地区都能观测到由相对海洋表面波的非线性相互作用产生的微气压波。在所有IMS次声波站点系统地估计微气压信号的到达方向。使用交叉方位法，我们每月对全球Microbarom源进行本地化。在大多数观测站，在平流层风向逆转和震源效应的推动下，微气压探测显示出明显的季节性趋势。探测的五年平均值提供了季节性来源变化的全球和统计观测。我们的微气压震源位置代表了从全球和长期测量中推断海洋膨胀特征的首次尝试。结果表明，月平均源位置在南北半球之间表现出明显的季节转换。这种方法有助于评估网络探测能力，并为次声可观测性、大气规格和海洋-大气相互作用之间的定量关系提供了新的见解。
[1] Multiyear continuous infrasound monitoring with the global International Monitoring System (IMS) demonstrates that microbaroms, generated by nonlinear interaction of opposing oceanic surface waves, are globally observed at equatorial, middle, and high latitudes. Direction of arrival of microbarom signals are systematically estimated at all IMS infrasound stations. Using a cross-bearing method, we perform a monthly localization of worldwide microbarom sources. At most stations, microbarom detections show clear seasonal trends, driven by stratospheric wind reversals and source effects. Five-year averaging of the detections provides global and statistical observations of seasonal source variations. Our microbarom source locations represent a first attempt to infer ocean swell characteristics from global and long-term measurements. We show that the monthly averaged source locations exhibit clear seasonal switching between the northern and southern hemispheres. Such an approach can help with evaluating the network detection capability, and provides new insights into quantitative relationships between infrasonic observables, atmospheric specifications, and ocean–atmosphere interactions.