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 Hyytiälä are used to investigate connections between ensemble mean snow density, particle fall velocity and parameters of the particle size distribution (PSD). The density...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2016-09-01
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| Series: | Atmospheric Measurement Techniques |
| Online Access: | http://www.atmos-meas-tech.net/9/4825/2016/amt-9-4825-2016.pdf |
| _version_ | 1818033964222251008 |
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| author | J. Tiira D. N. Moisseev A. von Lerber D. Ori A. Tokay L. F. Bliven W. Petersen |
| author_facet | J. Tiira D. N. Moisseev A. von Lerber D. Ori A. Tokay L. F. Bliven W. Petersen |
| author_sort | J. Tiira |
| collection | DOAJ |
| description | In this study measurements collected during winters 2013/2014 and 2014/2015
at the University of Helsinki measurement station in Hyytiälä 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 0.2 mm h<sup>−1</sup>, a correlation between the intercept parameter of normalized gamma PSD and
median volume diameter was observed. |
| first_indexed | 2024-12-10T06:31:38Z |
| format | Article |
| id | doaj.art-5800574434d14777b36b60c3fd0d8bd1 |
| institution | Directory Open Access Journal |
| issn | 1867-1381 1867-8548 |
| language | English |
| last_indexed | 2024-12-10T06:31:38Z |
| publishDate | 2016-09-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Measurement Techniques |
| spelling | doaj.art-5800574434d14777b36b60c3fd0d8bd12022-12-22T01:59:03ZengCopernicus PublicationsAtmospheric Measurement Techniques1867-13811867-85482016-09-01994825484110.5194/amt-9-4825-2016Ensemble mean density and its connection to other microphysical properties of falling snow as observed in Southern FinlandJ. Tiira0D. N. Moisseev1A. von Lerber2D. Ori3A. Tokay4L. F. Bliven5W. Petersen6Department of Physics, University of Helsinki, Helsinki, FinlandDepartment of Physics, University of Helsinki, Helsinki, FinlandFinnish Meteorological Institute, Helsinki, FinlandDepartment of Physics, University of Helsinki, Helsinki, FinlandJoint Center for Earth Systems Technology, University of Maryland, Baltimore County, Baltimore, USANASA GSFC/Wallops Flight Facility, Wallops Island, VA, USANASA-MSFC Earth Science Office, National Space Science and Technology Center, Huntsville, AL, USAIn this study measurements collected during winters 2013/2014 and 2014/2015 at the University of Helsinki measurement station in Hyytiälä 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 0.2 mm h<sup>−1</sup>, a correlation between the intercept parameter of normalized gamma PSD and median volume diameter was observed.http://www.atmos-meas-tech.net/9/4825/2016/amt-9-4825-2016.pdf |
| spellingShingle | J. Tiira D. N. Moisseev A. von Lerber D. Ori A. Tokay L. F. Bliven W. Petersen Ensemble mean density and its connection to other microphysical properties of falling snow as observed in Southern Finland Atmospheric Measurement Techniques |
| title | Ensemble mean density and its connection to other microphysical properties of falling snow as observed in Southern Finland |
| title_full | Ensemble mean density and its connection to other microphysical properties of falling snow as observed in Southern Finland |
| title_fullStr | Ensemble mean density and its connection to other microphysical properties of falling snow as observed in Southern Finland |
| title_full_unstemmed | Ensemble mean density and its connection to other microphysical properties of falling snow as observed in Southern Finland |
| title_short | Ensemble mean density and its connection to other microphysical properties of falling snow as observed in Southern Finland |
| title_sort | ensemble mean density and its connection to other microphysical properties of falling snow as observed in southern finland |
| url | http://www.atmos-meas-tech.net/9/4825/2016/amt-9-4825-2016.pdf |
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