Non-Melting Phenomena of Snowflakes Observed in Subsaturated Air below Freezing Level
Non-Melting Phenomena of Snowflakes Observed in Subsaturated Air below Freezing Level
复制标题
在低于冰点的过饱和空气中观察到的雪花不融化现象
DOI：
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发表时间：
1981
期刊：
影响因子：
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通讯作者：
Y. Sasyo
中科院分区：
文献类型：
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作者：
T. Matsuo;Y. Sasyo
本文对日本轮岛、松本和尼科气象站的地面气象资料进行了分析，以考察空气相对湿度对大气冰点以下雪花融化的影响。结果表明，地面观测到的降水类型（雨或雪）与地面相对湿度和地面气温密切相关。当地面相对湿度低于某一临界湿度时，即使地面温度高于0 ℃，降水也是雪。用回归分析法，得到各站的临界相对湿度RHcri与地面气温T的关系式为：RHcri=-7.5T+93，Wajima，RHcri= -7.3T+96，Mtsumoto，RHcri=-6.2T+91，尼科。由此得到的关系式与以前由Matsuo和Sasyo（1981）的理论计算得到的关系式很好地一致。
The analyses of the meteorological surface data at Wajima, Matsumoto, and Nikko Weather Stations in Japan were made in order to examine the effect of relative humidity of air on melting of snowflakes below freezing level in the atmosphere. The results showed that the types of precipitations (rain or snow) observed on the ground were closely dependent on surface relative humidity as well as surface air temperature. When surface relative humidity was below a certain critical humidity, even at a higher surface air temperature above 0* precipitations were snow. Using the regression analysis, the relations of the critical relative humidity RHcri to surface air temperature T could be obtained at each Weather Station in the following forms, RHcri=-7.5T+93, Wajima, RHcri= -7.3T+96, Mtsumoto, RHcri=-6.2T+91, Nikko. The relations thus obtained agreed well with that obtained previously from the theoretical calculations by Matsuo and Sasyo (1981).