Abstract
When global temperature increases, the atmosphere will be able to hold more water,as described by the Clausius-Clapeyron equation. It is thus hypothesised that the globalwater cycle will intensify under a warming climate. This might lead to more intense and morefrequent extreme precipitation events and might also affect the atmospheric circulation.This project investigates how moisture sources of precipitation over the Europeancontinent will change under SSP1-2.6 and SSP3-7.0 warming, using the atmosphericgeneral circulation model ECHAM6-wiso. A present day simulation (1990-2020), nudged toERA5 reanalysis, and a future simulation for each investigated SSP (2070-2099), nudged torespective CMIP6 coupled model output, are conducted. Using numerical water tracers, themodel is able to trace precipitation back to its point of evaporation, characterised by latitudeand longitude.Our results suggest that, under warming, the source latitude and longitude ofprecipitation in Europe will change across all seasons. The magnitude of change dependson the strength of the warming. These changes in source latitude and longitude reflectchanges in the mid-latitude wind patterns and atmospheric circulation.
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