A computer database for falling snowflakes

Autor:	Ken-ichiro Muramoto, Tatsuo Endoh, Toshio Harimaya, Kohki Matsuura
Rok vydání:	1993
Předmět:	Meteorology 010504 meteorology & atmospheric sciences North east Horizontal plane Snow 01 natural sciences Sea coast Maximum diameter Computer database Snowflake Falling (sensation) Geology 0105 earth and related environmental sciences Earth-Surface Processes
Zdroj:	Annals of Glaciology. 18:11-16
ISSN:	1727-5644 0260-3055
DOI:	10.3189/s0260305500011186
Popis:	A computer-based measurement system for characteristics of snowfall is described. To measure the size and velocity of falling snowflakes quantitatively, images of snowflakes were input to an image processor and the primary data were analyzed in real time. In this process, maximum diameter in a horizontal plane and falling velocity were recorded in previously set intervals, then stored on a disk. Since a lot of data were obtained during a full winter season, data had to be processed to make up a database after an experiment. Using this database, the data of the distribution of size and velocity of snowflakes can be retrieved at anytime. We observed snowflakes during winter months of 1986-92 in Sapporo and Toyama, which are located near the north east and middle of the Japan Sea coast respectively. The data indicate that the average size of snowflakes in Toyama was larger than that in Sapporo, while the number concentration of snowflakes in Sapporo was rather higher. The fall velocity tends to increase with increasing size of snowflakes, as observed in both areas.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::16dca6a9ee3f8a5e6cb601b22bb871fd https://doi.org/10.3189/s0260305500011186 Zobrazit plný text záznamu