Warm conveyor belt characteristics and impacts along the life cycle of extratropical cyclones: case studies and climatological analysis based on ERA5 ...

• Main Authors: Heitmann, Katharina, Sprenger, Michael, Binder, Hanin, Wernli, Heini, Joos, Hanna
• Format: Text
• Language: English
• Published: ETH Zurich 2024
• Subjects: North Atlantic
• Online Access: https://dx.doi.org/10.3929/ethz-b-000670470; http://hdl.handle.net/20.500.11850/670470

This study presents a systematic investigation of the characteristics and meteorological impacts of warm conveyor belts (WCBs). For this purpose, we compile a new WCB climatology (1980-2022) of trajectories calculated with the most recent reanalysis dataset ERA5 from the European Centre for Medium-Range Weather Forecasts (ECMWF). Based on this new climatology, two-dimensional masks are defined that represent the inflow, ascent, and outflow locations of WCBs. These masks are then used to objectively quantify the key characteristics (intensity, ascent rate, and ascent curvature) and meteorological impacts (precipitation and potential vorticity (PV) anomalies) of WCBs in order to (i) attribute them to different stages in the life cycle of the associated cyclones and to (ii) evaluate differences in the outflow of the cyclonic and anticyclonic branches. The approach was applied globally, but this study focuses on the North Atlantic, one of the regions where WCBs ascend most frequently.The method is first tested ... : Weather and Climate Dynamics, 5 (2) ...