Parsivel Distrometer Results presented at the American Geophysical Union, Spring 2007.

A series of measurements at the CARE site from the 2DVD instrument.

Overview of the Parsivel instrument:

• Measures size and fall velocity of hydrometeors
• Present weather sensor
• Sampling area: ~50 cm2, varies with drop diameter
• Number of size and velocity bins: 32 x 32 matrix
• Drop size range: 0.06-24.5 mm
• Velocity range: 0.05-20.8 m/sec
• Operation period at Wallops Island: Spring 2002 - present
• Manufacturer: OTT in Germany www.ott-hydrometry.de

The NASA Snowflake Video Imager obtained nearly continuous data from 1 Dec 06 thru 7 Mar 07.

This presentation contains a summary for the entire data set, which is sorted into (a) priority days selected by GSFC investigators, and (b) non-priority days.

The results are displayed in images of DSD(t), which reveal (a) the large variability of snowflakes sizes during events and (b) the intermittency of snowfall – even during intense storms.

Protocol for C3VP data.