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Title: Ensemble mean density and its connection to other microphysical properties of falling snow as observed in Southern Finland

In 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. Here, 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 0.2 mm h -1, a correlation between the intercept parameter of normalized gamma PSD and median volume diameter was observed.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7]
  1. Univ. of Helsinki, Helsinki (Finland)
  2. Univ. of Helsinki, Helsinki (Finland); Finnish Meteorological Institute, Helsinki (Finland)
  3. Finnish Meteorological Institute, Helsinki (Finland); Aalto Univ. (Finland)
  4. Univ. of Helsinki, Helsinki (Finland); Univ. of Bologna, Bologna (Italy)
  5. Univ. of Maryland Baltimore County (UMBC), Baltimore, MD (United States); NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  6. NASA GSFC/Wallops Flight Facility, Wallops Island, VA (United States)
  7. National Space Science and Technology Center, Huntsville, AL (United States)
Publication Date:
Grant/Contract Number:
263333; 272041
Type:
Accepted Manuscript
Journal Name:
Atmospheric Measurement Techniques (Online)
Additional Journal Information:
Journal Name: Atmospheric Measurement Techniques (Online); Journal Volume: 9; Journal Issue: 9; Journal ID: ISSN 1867-8548
Publisher:
European Geosciences Union
Research Org:
Univ. of Helsinki, Helsinki (Finland). Dept. of Physics
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES
OSTI Identifier:
1375416

Tiira, Jussi, Moisseev, Dmitri N., von Lerber, Annakaisa, Ori, Davide, Tokay, Ali, Bliven, Larry F., and Petersen, Walter. Ensemble mean density and its connection to other microphysical properties of falling snow as observed in Southern Finland. United States: N. p., Web. doi:10.5194/amt-9-4825-2016.
Tiira, Jussi, Moisseev, Dmitri N., von Lerber, Annakaisa, Ori, Davide, Tokay, Ali, Bliven, Larry F., & Petersen, Walter. Ensemble mean density and its connection to other microphysical properties of falling snow as observed in Southern Finland. United States. doi:10.5194/amt-9-4825-2016.
Tiira, Jussi, Moisseev, Dmitri N., von Lerber, Annakaisa, Ori, Davide, Tokay, Ali, Bliven, Larry F., and Petersen, Walter. 2016. "Ensemble mean density and its connection to other microphysical properties of falling snow as observed in Southern Finland". United States. doi:10.5194/amt-9-4825-2016. https://www.osti.gov/servlets/purl/1375416.
@article{osti_1375416,
title = {Ensemble mean density and its connection to other microphysical properties of falling snow as observed in Southern Finland},
author = {Tiira, Jussi and Moisseev, Dmitri N. and von Lerber, Annakaisa and Ori, Davide and Tokay, Ali and Bliven, Larry F. and Petersen, Walter},
abstractNote = {In 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. Here, 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 0.2 mm h-1, a correlation between the intercept parameter of normalized gamma PSD and median volume diameter was observed.},
doi = {10.5194/amt-9-4825-2016},
journal = {Atmospheric Measurement Techniques (Online)},
number = 9,
volume = 9,
place = {United States},
year = {2016},
month = {9}
}