Dependence of Snowfall on Temperature
D'OOGE has reported1 a correlation between amount of snowfall in inches and temperature at the time of snowfall. His data showed that maximum depth of snowfall occurred at a daily mean temperature of − 11° C. ; Bossolasco2 correlated frequency of occurrence of snowfall with temperature and found maximum occurrence at approximately the same temperature. These observers assumed that the mean daily temperature recorded at the level of observation was a reasonable estimate of the temperature at the level of formation of the snow. From the data presented, conclusions were drawn concerning nucleation of snow crystals.
Sulla genesi delle precipitazioni
RiassuntoIn base a diverse serie di osservazioni meteorologiche raccolte su alte montagne, specie delle Alpi, l'A. dimostra che la conservazione della nebbia sottoraffreddata e la genesi delle precipitazioni nevose, sono regolate dalle temperature intorno a −11°, −4°–5° e −19° C, in completo accordo con lo spettro dei nuclei di congelamento dedotto sperimentalmente. Il risultato ha validità generale. — Segue l'illustrazione di talune deduzioni, con considerazioni interpretative.SummaryMaking use of different series of meterological observations carried out in high mountains, particularly in the Alps, the Author proves that the conservations-tendency of undercooled fog and the formation of snow are essentially controlled by the air-temperatures around −11°, −4°–5° and −19°C, in perfect agreement with the spectrum of freezing nuclei, known from laboratory work. The result is of general validity. — Some interpretations are presented.ZusammenfassungAuf Grund verschiedenen, im Hochgebirge, besonders in den Alpen, gesammelten meteorologischen Beobachtungsreihen, beweist der Verf., das die Erhaltungstendenz des unterkühlten Nebels und die Schneebildung wesentlich mitbestimmt werden durch die Luft-Temperaturen um −11°, −4°–5° und −19° C, in vollkommener Uebereinstimmung mit dem experimentell abgeleiten Spektrum der Gefrierkerne. Das Ergebnis hat allgemeine Gültigkeit. — Es folgen einige erläuternde Betrachtungen.
Newly Fallen Snow and Air Temperature
THE physical features of a layer of fallen snow at a given time are chiefly dependent on (1) meteorological conditions while the snow is falling, and (2) meteorological factors which occur later causing metamorphosis of the snow.