NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Ensemble Mean Density and its Connection to Other Microphysical Properties of Falling Snow as Observed in Southern FinlandIn this study measurements collected during winters 2013/2014 and 2014/2015 at the University of Helsinki measurement station in Hyytiala are used to investigate connections between ensemble mean snow density, particle fall velocity and parameters of the particle size distribution (PSD). The density of snow is derived from measurements of particle fall velocity and PSD, provided by a particle video imager, and weighing gauge measurements of precipitation rate. Validity of the retrieved density values is checked against snow depth measurements. A relation retrieved for the ensemble mean snow density and median volume diameter is in general agreement with previous studies, but it is observed to vary significantly from one winter to the other. From these observations, characteristic mass- dimensional relations of snow are retrieved. For snow rates more than 0.2mm/h, a correlation between the intercept parameter of normalized gamma PSD and median volume diameter was observed.
Document ID
20170002519
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Tiira, Jussi
(Helsinki Univ. Helsinki, Finland)
Moisseev, Dmitri N.
(Helsinki Univ. Helsinki, Finland)
Lerber, Annakaisa von
(Finnish Meteorological Inst. Helsinki, Finland)
Ori, Davide
(Helsinki Univ. Helsinki, Finland)
Tokay, Ali
(Maryland Univ. Baltimore County Baltimore, MD, United States)
Bliven, Larry F.
(NASA Wallops Flight Facility Wallops Island, VA, United States)
Petersen, Walter
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
March 23, 2017
Publication Date
September 28, 2016
Publication Information
Publication: Atmospheric Measurement Techniques
Publisher: Copernicus Publications
Volume: 9
Issue: 9
e-ISSN: 1867-8548
Subject Category
Earth Resources And Remote Sensing
Instrumentation And Photography
Report/Patent Number
GSFC-E-DAA-TN40519
Funding Number(s)
CONTRACT_GRANT: PNOWWA GA No.699221
CONTRACT_GRANT: AF G No.263333
CONTRACT_GRANT: AF FCEP G No.272041
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available