BEGIN:VCALENDAR VERSION:2.0 PRODID:-//pretalx//pretalx.earthmonitor.org//global-workshop-2026//TWSP3D BEGIN:VTIMEZONE TZID:Europe/Amsterdam BEGIN:STANDARD DTSTART:20001029T030000 RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10 TZNAME:CET TZOFFSETFROM:+0200 TZOFFSETTO:+0100 END:STANDARD BEGIN:DAYLIGHT DTSTART:20000326T020000 RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=3 TZNAME:CEST TZOFFSETFROM:+0100 TZOFFSETTO:+0200 END:DAYLIGHT END:VTIMEZONE BEGIN:VEVENT 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:20260624T065804Z 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/ END:VEVENT BEGIN:VEVENT UID:pretalx-global-workshop-2026-QF38UE@pretalx.earthmonitor.org DTSTART;TZID=Europe/Amsterdam:20261007T161500 DTEND;TZID=Europe/Amsterdam:20261007T163000 DESCRIPTION:Abstract\nFlash droughts are increasingly recognized as a disti nct class of hydroclimatic extremes marked by rapid soil-moisture depletio n over only a few weeks. Because of their abrupt onset\, these events can severely affect agricultural production\, terrestrial ecosystems\, and reg ional water resources before conventional drought indicators fully capture their development. Recent drought episodes across Europe have reinforced the need to better understand how flash drought behaviour may evolve under continued climate warming. Yet substantial uncertainty remains\, partly b ecause many previous assessments rely on meteorological indicators or sing le datasets that do not adequately represent the subsurface soil-moisture processes governing rapid drought emergence.\nThis study proposes to inves tigate the future evolution of flash drought characteristics across Europe using root-zone soil moisture simulations from a multi-model ensemble of global hydrological models\, including WaterGAP\, H08\, and CWatM\, forced by bias-adjusted CMIP6 climate projections. Daily soil-moisture outputs w ill be aggregated to pentad scale (5-day averages) to reduce high-volatili ty while preserving the rapid depletion signals associated with flash drou ght onset. Root-zone soil moisture will then be transformed into grid-spec ific climatological percentiles\, enabling a temporally and spatially cons istent identification of flash drought events across models and time perio ds. A key methodological contribution of this study is the integration of pentad-scale root-zone soil moisture percentiles with a multi-model hydrol ogical ensemble\, enabling a consistent and process-relevant assessment of future flash drought dynamics across Europe.\nUsing this framework\, the study will assess potential changes in flash drought frequency\, duration\ , severity\, and onset speed under historical conditions and future projec tions for SSP1-2.6\, SSP2-4.5\, and SSP5-8.5. The analysis is intended to advance understanding of future rapid drought development and to support d rought risk assessment\, climate adaptation planning\, and early-warning s trategies across Europe.\n\n\n\nKeywords: Flash drought\; Root-zone soil m oisture\; Global hydrological models\; CMIP6\; Europe. DTSTAMP:20260624T065804Z LOCATION:Room 18 SUMMARY:Emerging Flash Drought Risk across Europe: Insights from Multi-Mode l Root-Zone Soil Moisture Projections - VAIBHAV KUMAR URL:https://pretalx.earthmonitor.org/global-workshop-2026/talk/QF38UE/ END:VEVENT END:VCALENDAR