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IPCC, 2001Climate change 2001The scientific

basis,Contribution of Working Group I to the third

Assessment Report of the Intergovernmental Panel

on Climate ChangeHoughton,J.T.et al.eds..

Cambridge University Press,881pp.

1979

4137-45

197650247pp

200120116

pp

Nakamura, T. and M. Shimizu, 1996Variation of

snow,winter precipitation and winter air tempera-

ture during the last century at Nagaoka, Japan,

Journal of Glaciology,42,136-140.

196135

)281pp

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193778pp

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43-24

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2)A-84-126163pp

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38173-178

194620294

pp

20008019181997

)37799pp

200365

3)303-316

Long-term Changes in Snowfall Depth and Snowcover Depth

in and around Niigata Prefecture from 1927 to 2005Analysis Using Data Observed at Railway Stations

Hiroto SUZUKI

Research and Development Center of JR East Group,East Japan Railway Company,

2-0 Nisshin-cho,Kita-ku,Saitama,Saitama 331-8513,Japan.

(Received 14 June 2005Accepted 19 January 2006)

Abstract

The objective of this study is to clarify the long-term changes in snowfall depth and snowcover depth

and the dependences of snowfall depth and snowcover depth on temperature and precipitation in Niigata,

Yamagata,and Fukushima prefecture, and these were analyzed by using data observed at 14 railway

stations from 1927 to 2005.

Annual snowfall depth,annual maximum snowcover depth,and annual maximum daily snowfall depth

have a decreasing trend from 1927 to 2005.These also have decadal cyclic variations,and there were high

before the middle 1940s,low from the late 1940s to the 1950s,high from the 1960s to the middle 1980

s,and low after the late 1980s.

Annual snowfall depth and annual maximum snowcover depth show negative correlation with the winter

from December to Februarymean temperature at all stations.Furthermore,in case of the winter mean

temperature rising,the higher the winter mean temperature of the site,the larger the decreasing rates of

annual snowfall depth and annual maximum snowcover depth become.Annual snowfall depth and annual

maximum snowcover depth show positive correlation with the winter precipitation at most of the stations.

Furthermore,in case of the winter precipitation increasing,the lower the winter mean temperature of the

site,the larger the increase of annual snowfall depth and annual maximum snowcover depth become.

16

19272005196

"533