Title

SNOW-ONE-A and B Characterization Measurements and Data Analysis

Date

1983

Index Abstract

Coming Soon

Photo Quality

Not Needed

Report Number

AFGL TR 83-0256

Creator

Berthel, R. O.

Plank, V. G.

Main, B. A.

Corporate Author

Air Force Geophysics Laboratory

Date Issued

1983-09-20

Extent

60

Identifier

ADA141245

Distribution Classification

1

DTIC Record Exists

No

Distribution Change Authority Correspondence

None

Abstract

To make realistic estimates of precipitable hydrometeors, meteorological modeling requires valid inter-relationships for the paramerization of mass concentrations, precipitation rates, fall velocities, number densities, etc. In response to these needs, AFGL has initiated a modest effort with objectives of defining such relationships and providing the means to verify model outputs. Measurements documenting the characteristics of naturally falling snow were obtained during the SNOW-ONE-A and SNOW-ONE-B field experiments. These consist of data acquired by three unique instruments: a snow-rate meter (SRM), a fall-velocity indicator (FVI), and a snow-structure recorder (SSR). This report describes the results of our participation in these field programs. Snow rates, particle-fall velocities, and snow-crystal information are presented. Correlations between snow rate and electro-optical transmittance/attenuation and mass-concentration measurements are illustrated. Relationships of fall velocity with snow-crystal size from analyzed data are given along with a method of determining fall velocity through knowledge of snow rate and liquid-water content. The data obtained during these two field experiments indicate that it may be possible to define mathematical relationships between precipitation rate and mass concentration and between fall velocity and snowflake size for broad categories of snow types.

Report Availability

Full text available by request

Provenance

IIT

Type

report

Format

60 pages ; 28 cm.