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Understanding Snowfall Characteristics: Multi-Scale Effects and Instrumentation Advances

This research aims to enhance snowfall forecasting by investigating the roles of multi-scale motion and microphysical transformations. We study both synoptic and small-scale effects on precipitation accumulation through phenomena such as low-level convergence, diabatic cooling, and temperature disturbances. Additionally, we explore the impact of ice nuclei and cloud condensation nuclei on precipitation distribution. Our objectives also include examining orographic enhancements under different conditions and utilizing advanced instruments to derive relationships between snow properties and radar observations.

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Understanding Snowfall Characteristics: Multi-Scale Effects and Instrumentation Advances

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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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