Hydrological drought events are driven by a variety of hydro-meteorological processes including a lack of rainfall, snowmelt deficit, or high evapotranspiration, whose importance varies with hydro-climate and by event severity (Brunner et al., 2022;Markonis et al., 2021;. In addition, the relative importance of different drought generation processes can vary in time and may change in a warming climate. Such changes might have direct impacts on drought severity (i.e., intensity, deficit, and duration), as different drought generation processes are related to different levels of drought severity. For example, droughts that are caused by a rainfall deficit and prolonged into the dry season have been associated with longer drought durations and deficits than purely rainfall-driven events (Brunner et al., 2022). This finding suggests that a transition to even drier conditions in a warming climate may lead to a further intensification of drought. Understanding changes in drought generation processes, is therefore important to understand potential future changes in drought severity.Previous studies have looked at past and future changes in the frequency and severity of different drought variables, including meteorological, agricultural, and hydrological droughts (Ionita & Nagavciuc, 2021;Markonis et al., 2021;Stahl et al., 2010). While there is clear evidence for past changes in the severity and frequency of meteorological or agricultural droughts, it is yet unclear how the driving processes of hydrological droughts have
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