Speaker
Description
The International Monitoring System (IMS) offers a vast amount of data that can advance scientific research beyond treaty verification. Here, observations of beryllium-7 (Be-7) that are made by particulate radionuclide IMS stations are considered to study atmospheric processes. Be-7 is a cosmogenic radionuclide that is produced mainly in the upper troposphere and lower stratosphere. Near-ground Be-7 concentrations are governed by several atmospheric processes, including deposition and downward advection. Observed variations in the Be-7 concentration allows to study these processes.
Here, a backward-in-time modelling approach is proposed using the Lagrangian particle dispersion model FLEXPART. The model allows to explain observed peak concentrations of Be-7 by linking these observations with specific weather events such as stratosphere-to-troposphere exchange. Examples will be provided, including a case where stratosphere-to-troposphere exchange was facilitated by a cut-off low. A better understanding of stratosphere-troposphere processes is of particular interest as it allows for extended-range weather forecasting, which is of high interest for several applications, including agriculture and the energy market.
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