Print Email Facebook Twitter Infrasonic interferometry applied to microbaroms observed at the Large Aperture Infrasound Array in the Netherlands Title Infrasonic interferometry applied to microbaroms observed at the Large Aperture Infrasound Array in the Netherlands Author Fricke, J.T. Evers, L.G. Smets, P.S.M. Wapenaar, C.P.A. Simons, D.G. Faculty Civil Engineering and Geosciences Department Geoscience & Engineering Date 2014-08-19 Abstract We present the results of infrasonic interferometry applied to microbaroms, obtained from ambient noise. For this purpose the “Large Aperture Infrasound Array” (LAIA) was used, which has been installed in the Netherlands. Preprocessing appeared to be an essential step in enhancing the microbarom signals from ambient noise that strongly influences the results of the interferometry. Both the state of the atmosphere and the noise characteristics are taken into account to assess the strength of the cross correlation. The delay time of the microbaroms between two stations is determined through cross correlating the recordings. By calculating the cross correlations between all 55 station pairs of LAIA, we are able to find the delay time of microbaroms up to a interstation distance of 40.6 km. Using the strength of the cross correlations, we are able to show that the coherence of the microbaroms along the direction of arrival is higher than orthogonal to it. A comparison of the atmospheric state, with a cross correlation, over a period of 10 days, reveals that the infrasound propagation over the array is correlated with the tropospheric temperature and wind. Based on the cross correlations between the three closest stations, we are able to passively estimate the effective sound speed and the wind speed as a function of time. Subject infrasonic interferometrymicrobaromstroposphere To reference this document use: http://resolver.tudelft.nl/uuid:0717bd46-5ec4-4535-8dda-fd74cfd874ee DOI https://doi.org/10.1002/2014JD021663 Publisher American Geophysical Union Embargo date 2015-02-19 ISSN 2169-897X Source Journal of Geophysical Research: Atmospheres, 119 (16), 2014 Part of collection Institutional Repository Document type journal article Rights © 2014 American Geophysical Union Files PDF Fricke_2014.pdf 5.96 MB Close viewer /islandora/object/uuid:0717bd46-5ec4-4535-8dda-fd74cfd874ee/datastream/OBJ/view