- 1Royal Netherlands Meteorological Institute (KNMI), Department Seismology and Acoustics, De Bilt, Netherlands (evers@knmi.nl)
- 2Delft University of Technology, Department of Geoscience and Engineering, Faculty of Civil Engineering and Geosciences, Delft, the Netherlands
- 3DGMR, The Hague, the Netherlands
Seasonal variability in source activity and atmospheric temperature were retrieved from 11 years of infrasonic ambient noise. Variable lag times between an array (IMS array I53US) and single microbarometer (POKR, AK) were obtained from envelopes of cross-correlation functions. Beamforming and one-bit normalization significantly enhanced the stationary phase. Both microbaroms and surf appeared abundantly present, in the 0.1 to 2.0 Hz frequency band. Modeling revealed both tropospheric and stratospheric propagation of the infrasound, following traditional and more unconventional propagation mechanisms. Virtual source-receiver refractions from stratospheric altitudes appeared a plausible explanation for the unusual short lag times, which allows for new ways to passively probe the stratosphere.
Keypoints:
- The cross correlation of infrasonic ambient revealed coherent energy from microbaroms and surf from a broad-band analysis
- Seasonal variability was retrieved in source and medium variations in 11 years of microbarometer data
- Stratospheric virtual source-receiver refractions can explain the unusual short lag times, providing new means to probe the upper atmosphere
How to cite: Evers, L. G., Assink, J. D., and Fricke, J. T.: Evidence for virtual source-receiver refractions in cross correlations of infrasonic ambient noise, EGU General Assembly 2026, Vienna, Austria, 3–8 May 2026, EGU26-2319, https://doi.org/10.5194/egusphere-egu26-2319, 2026.
