Conveners
O1.1 The Atmosphere and its Dynamic
- Anne Tipka (CTBTO Preparatory Commission)
- Daniela Ghica (National Institute for Earth Physics (NIEP))
Atmospheric transport models (ATMs) are used for many important applications, including fate and transport simulations of radionuclides emitted to the atmosphere (forward modeling) and determining the possible origin of release of radionuclides measured by the International Monitoring System (backward modeling). Large meteorological data sets are needed by ATMs, which are generated and updated...
The influence of anisotropic wind velocity and temperature inhomogeneities on the attenuation of infrasound field intensity with increasing distance from a point source and its altitude distribution is studied. The field is calculated as a function of receiver height and horizontal distance from the source using method of the pseudo-differential parabolic equation for the atmosphere with model...
Radionuclide released by an underground nuclear explosion (UNE) may seep through the overburden and become airborne. Once in the atmosphere, their fate will depend on the release location (flat versus mountainous terrain) and conditions (jetting versus seeping, hot versus neutral). In mountainous terrain, winds are very heterogeneous due to terrain effects like channeling, blocking and...
Radionuclides are one of several signatures of nuclear explosions monitored by the International Monitoring System (IMS). Data fusion methods are being developed to combine multiple signatures for improved detectability and source attribution. To utilise radionuclide signatures in a data fusion framework, it is important to quantify the sensitivities of a potential signal to physical processes...
Turbulent pressure fluctuations around infrasound sensors, known as wind noise, are the primary factor masking infrasound detections of interest, such as signals generated by natural hazards. Identifying deployment sites with sufficiently low wind noise levels is crucial for achieving good signal to noise ratios. Noise levels are expected to correlate with local topography, which influences...
