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UID:pretalx-global-workshop-2026-SFZHLV@pretalx.earthmonitor.org
DTSTART;TZID=Europe/Amsterdam:20261007T180500
DTEND;TZID=Europe/Amsterdam:20261007T181000
DESCRIPTION:Abstract\nFlash droughts—characterized by abrupt onset and ra
 pid soil moisture depletion—are emerging as a consequential hydroclimati
 c extreme across Europe. Their fast evolution\, strong sensitivity to atmo
 spheric evaporative demand\, and reinforcement through land–atmosphere c
 oupling challenge traditional drought monitoring approaches that were larg
 ely developed to track slowly evolving deficits. Despite growing attention
 \, continental-scale understanding of how flash droughts initiate\, propag
 ate\, and vary across Europe’s diverse climate regimes remains limited.\
 nHerein\, we propose a framework for flash drought detection and character
 ization using three complementary soil moisture perspectives: ASCAT satell
 ite observations\, ERA5-Land reanalysis\, and GloFAS hydrological model so
 il moisture. The analysis covers 2007–2024 at dekadal (10-day) resolutio
 n. Flash drought onset is diagnosed from rapid short-timescale declines in
  near-surface soil moisture percentiles derived from ASCAT and ERA5-Land\,
  while GloFAS is used to assess whether—and where—these surface drying
  signals propagate into catchment-scale hydrological response. To ensure c
 omparability across datasets with differing process representations and ef
 fective soil depths\, all soil moisture variables are expressed in a commo
 n percentile space\, which isolates anomalous moisture states relative to 
 local climatology.\nUsing this unified framework\, we quantify key flash d
 rought characteristics—including frequency\, mean duration\, severity\, 
 and mean onset speed—across Europe and examine how these metrics vary ac
 ross major climate regimes. The findings highlight pronounced regional het
 erogeneity and systematic cross-system contrasts. ASCAT captures the sharp
 est and most immediate surface drying signals\, whereas ERA5-Land and GloF
 AS provide complementary insight into physically consistent drivers and th
 e potential for downstream hydrological impacts. Overall\, the results emp
 hasize that flash drought diagnosis benefits from combining observation-in
 formed onset detection with process-oriented evaluation of drivers and hyd
 rological propagation. This multi-perspective approach offers a consistent
  basis for strengthening monitoring and supporting early-warning readiness
  under Europe’s intensifying hydroclimatic variability.\n\n\nKeywords: F
 lash drought\; Soil-moisture\; ASCAT\, ERA5-Land\; GloFAS\, Hydrological r
 esponse\, Land–atmosphere coupling\, Europe.
DTSTAMP:20260624T084439Z
LOCATION:Aula Magna
SUMMARY:From Surface Drying to Hydrological Response: An Integrated Diagnos
 is of Flash Droughts across Europe - VAIBHAV KUMAR
URL:https://pretalx.earthmonitor.org/global-workshop-2026/talk/SFZHLV/
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