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Research Objectives ASCII - CU

Research Objectives ASCII - CU. Katja Friedrich. Objective #1: Role of Multi-Scale motion and Microphysical Transformation on Snowfall Characteristics .

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Research Objectives ASCII - CU

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  1. Research ObjectivesASCII - CU Katja Friedrich

  2. Objective #1:Role of Multi-Scale motion and Microphysical Transformation on Snowfall Characteristics

  3. - Investigate the role of synoptic versus small-scale kinematic and thermodynamic effects control precipitation accumulation, and are, therefore, important to better forecast the evolution of snowfall 13-14 April 2011

  4. 13-14 April 2011 • low-level convergence (terrain-induced, small-scale turbulence), • diabaticcooling effects, and • local temperature disturbances (surface cold-pool, mid-level warm noses)

  5. - Role of liquid water content/degree of riming during seeding and non-seeding conditions- Study role of ice nuclei (IN) and cloud condensation nuclei (CCN) on precipitation distribution and amount - Study low-level riming process and enhancement of precipitation efficiency (seeder-feeder mechanism, BL turbulence, mesoscale wind)

  6. Objective#2: Orographic Enhancement under seeded and no-seeded conditions

  7. Objective #3:Combining of State-Of-The-Art Instruments to Improve the Description of Snowfall Characteristics • What are the combined influences of snow particle habit, PSD, mass density, and SLW on • passive and active microwave observations? • Snow crystal habits and density are a function of temperature, humidity, liquid water content, and atmospheric stability. • derive a robust relation between radar reflectivity and snowfall precipitation rate Front Range Boulder April-May 2011

  8. MRR

  9. MRR

  10. Radiometer

  11. Disdrometer

  12. DOW Radar • Dual-pol parameters (attenuation correction, hydrometeor classification) • NCAR clutter algorithm ? • VAD winds (Froude/Richardson numbers) • CFADs (Z, Zdr,…) • Single-Doppler analysis ?

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