XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
بيانات النشر:
GFZ German Research Centre for Geosciences, 2023.
سنة النشر:
2023
الوصف:
Over the last decade, floods were the type of disaster causing the most material damages and fatalities. A better knowledge of the atmospheric processes leading to precipitation is mandatory to better predict severe floods and mitigate their impact on human societies, in particular in the context of a changing climate.This study focuses on a squall line system which occurred over the ARM (South Great Plain Central Facility) site in Oklahoma on June 2011 and was observed by multifrequency radars. In particular, we analyze the temporal and vertical evolution of the drop size distribution (DSD) provided by a recently developed retrieval technique combining the Doppler spectra observed by two co-located vertically pointing cloud radars.One of the most uncertain rain microphysics process is the breakup of drops. It is represented in bulk models via vastly different versions of a parameterization combining the collection and breakup processes. By exploiting the variations of the bulk properties of the DSD, we evaluate the ability of the different parameterizations to reproduce the observations. These results suggest that such radar observations have the potential for reducing the uncertainty associated with the representation of the breakup process in models.In addition, as the radar observations permit to retrieve DSD in a bin manner with high vertical and temporal resolutions, the impact of the breakup process on the DSD profile can also be studied by comparing the observations with the bin DESCAM microphysics scheme. The 28th IUGG General Assembly (IUGG2023) (Berlin 2023)
