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Precipitation phase discrimination by dew point and air temperature
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
2008 (English)In: Proceedings of the Western Snow Conference, Kailua-Kona, Hawaii, April, 16 - 19, 2007: seventy-fifth annual meeting / [ed] Randall Julander, Soda Springs, Calif: Western Snow Conference , 2008, 141-145 p.Conference paper (Refereed)
Abstract [en]

Correctly reported precipitation phases are crucial for estimation of snow storage in hydrological, regional and global climate models. Precipitation phase is especially critical for models simulating processes in tree canopies, since the canopy storage capacity is about one order of magnitude larger for snow than rain. The number of manned meteorological stations is decreasing, making determination of precipitation phase more difficult. Most hydrological models use an air temperature threshold to separate rain from snow, but there are indications that a dew-point temperature threshold might work better. This study utilized forty-five years of three-hour man-made observations for nineteen Swedish station ranging from 55˚N to 68˚N consisting of precipitation mass and phase, air and dew point temperatures. Precipitation events classed as snow or rain, excluding mixed precipitation, were used for the initial analysis.  Air temperature was found to be a better indicator of precipitation phase then dew point temperature. On occasion 0˚C is used as an air temperature threshold, but if the air temperature rain/snow threshold 0˚C is replaced by 1.0˚C the misclassified precipitation would be reduced by almost half in Sweden. Further analysis to identify mixed precipitation, totaling 16% of the precipitation is also included.

Place, publisher, year, edition, pages
Soda Springs, Calif: Western Snow Conference , 2008. 141-145 p.
Research subject
Applied Geology
Identifiers
URN: urn:nbn:se:ltu:diva-40409Local ID: f8995680-caab-11dd-9935-000ea68e967bOAI: oai:DiVA.org:ltu-40409DiVA: diva2:1013931
Conference
Western Snow Conference : 16/04/2007 - 19/04/2007
Note
Godkänd; 2008; 20081215 (mivu)Available from: 2016-10-03 Created: 2016-10-03Bibliographically approved

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