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Key Aspects of Data Assimilation in the HyMeX Campaign: Insights from Madison Meeting

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This document discusses the fifth meeting of the HyMeX campaign held in Madison, Wisconsin, focusing on the hydrological cycle in the Mediterranean region. The meeting emphasized the scientific objectives surrounding mesoscale convective systems, coastal orographic precipitation, and the impact of climate change on intense weather events. Key questions explored include the necessary conditions for extreme events and their future evolution. Real-time modeling efforts, assimilated data types, and observational strategies for targeted heavy precipitation and dense water formation are also detailed, outlining the campaign's significant progress and findings.

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Key Aspects of Data Assimilation in the HyMeX Campaign: Insights from Madison Meeting

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  1. Data Assimilation aspects and the HyMeX* campaignDAOS 5th Meeting, Madison, Wisconsin, USAY. Michel and N. Fourrié (Météo-France, CNRM-GAME) and coauthors http://www.hymex.org/ Email: hymex@cnrm.meteo.fr *Hydrological cycle in the Mediterranean eXperiment

  2. HyMeX objectivesScientific topics

  3. HyMeX objectivesScientific topics Mesoscale convective systems Slow-moving frontal systems Coastal orographic precipitation Better understanding of the intense events: processes and contribution to the trend Key questions: What are the ingredients and their interactions necessary to produce an extreme event ? What will be the evolution of intense events with the global climate change ? Mediterranean cyclogeneses Regional winds (Mistral, Bora, Tramontana)

  4. ? Observation Strategy (Focus on NW Med TA) NW Med TA --- Target Area of the first EOP/SOP series Hydrometeorological sites Atmospheric sites Key regions for dense water formation and ocean convection SOP1 in order to document: - Heavy precipitation and Flash-flooding - Ocean state prior the formation of dense water SOP2 in order to document: - Dense Water Formation and Ocean convection - Cyclogenesis and local winds

  5. TS7: Real-time modelling forecast during SOP/EOP Real-time atmospheric models to guide observation deployement (available at the HOC) MM5-D1 (22.5km) WRF-MED1 (50km) AROME_FRANCE (2.5km) MM5-D2 (7.5km) WRF-MED2 (7km) AROME_WMED (2.5km) MM5-D3 (2.5km) BOLAM (11km) BOLAM (15km) MOLOCH (2.7km) ALADIN-HR (8km) MESO-NH (2.5km) (BOLD, with assimilation cycle)

  6. AROME-WMED: Data Assimilation • Assimilation scheme: • 3D-Var at 2.5km, assimilation window 3h, 48H forecast range • Assimilated observations: • Conventional data : surface data, wind profilers, radiosondes • Ground-based GPS stations • Satellite radiances from geostationnary and polar-orbiting satellites • Radar doppler winds and reflectivities (1D+3D-Var of RH profiles) • Wind derived from satellite imagery AROME WMED 960x640 points Additional SYNOP provided by Spain

  7. Daily update on web site http://sop.hymex.org Predicted rain 24H Rain Rates obs. rain 24H Treatment of spanish, catalan and italian SYNOPS

  8. Facility Status

  9. The campaign has started! Already 4 IOPs for heavy precipitating events over Italy

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