Variation of snow, winter precipitation and winter air temperature during the last century at Nagaoka, Japan
Variation of snow, winter precipitation and winter air temperature during the last century at Nagaoka, Japan
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日本长冈市上世纪积雪、冬季降水和冬季气温的变化
DOI：
10.3189/s0022143000030598
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发表时间：
1996
影响因子：
3.4
通讯作者：
M. Shimizu
中科院分区：
文献类型：
--
作者：
Tsutomu Nakamura;M. Shimizu
摘要 日本长冈从 1986-87 年到 1993-94 年的八个冬季降雪量减少，似乎是由于冬季气温升高所致。近100年来冬季气温呈逐渐升高的周期性变化。计算出近百年气温上升的线性率为每100年1.35℃。最大积雪深度和冬季降水量均与冬季平均气温呈负相关，统计相关系数r2的平方分别为0.321和0.107。分别。统计平滑曲线或最大雪深和冬季降水量在1940年出现最大值，最大雪深偏差的波动值小于降水量。由10年移动平均曲线得出的冬季最低气温出现在1942年，与气候平均值的偏差在1949年由负转为正。符号的变化或温度偏差的增加可能与全球变暖有关。
Abstract Reduced amounts of snow in the eight winters from 1986-87 to 1993-94 at Nagaoka, Japan, seem to be due to a winter air-temprature rise. The winter air temprature has shown cyclic varition gradual increase in the past 100years. The linear rate of the temperature rise in the past century was calculated as 1.35°C per 100 years. Both the maximum Snow depth and winter precipitation showed an inversely positive correlation with winter mean air temperature, The square of the statistical correlation coefficient r2 was calculated as 0.321 and 0.107. respectively. Statistically smoothed curves or the maximum snow depth and winter precipitation showed maximum values in 1940, Fluctuations in deviation of the maximum Snow depth showed smaller values than in precipitation. The minimum winter mean air temperature obtained from a 10 year moving average curve was found in 1942, and the deviation fom the climatic mean changed from negative to positive in 1949. The change in sign or the temperature deviation and the increase of the deviation may be attributable to global warming.