Based upon 48-year observed data of 80 meteorological observed stations in Heilongjiang province,the paper laid special stress on analysing the temporal and spatial distribution of accumulated temperature and precipit...Based upon 48-year observed data of 80 meteorological observed stations in Heilongjiang province,the paper laid special stress on analysing the temporal and spatial distribution of accumulated temperature and precipitation as well as interdecadal variation in Heilongjiang by means of cluster analysis,taking accumulated temperature and rainfall as main factors.As was shown in the results,with global warming,the mean temperature in Heilongjiang showed a trend of escalation with an average increase of 0.88 ℃ throughout the whole province in recent 48 years.However,the mean temperature anomalies in different years had their own characteristics.Abnormal years in temperature were mainly the extreme cold years before the 1990s;the abnormal years were mainly comprised of the extreme warm years after the 1990s.The province was divided into 5 planting zones according to the results of cluster analysis.The partition of 2 standard climate years in 1961-1990 and 1971-2000 was basically identical.Compared with the demarcation line of 1961-1990,the divisiory boundary of 1971-2000 showed a trend of northward movement.Since 1990s,there was a significant increase in temperature.The changes in division were greater from 1991 to 2005 and the trend of northward movement was more obvious.展开更多
文摘Based upon 48-year observed data of 80 meteorological observed stations in Heilongjiang province,the paper laid special stress on analysing the temporal and spatial distribution of accumulated temperature and precipitation as well as interdecadal variation in Heilongjiang by means of cluster analysis,taking accumulated temperature and rainfall as main factors.As was shown in the results,with global warming,the mean temperature in Heilongjiang showed a trend of escalation with an average increase of 0.88 ℃ throughout the whole province in recent 48 years.However,the mean temperature anomalies in different years had their own characteristics.Abnormal years in temperature were mainly the extreme cold years before the 1990s;the abnormal years were mainly comprised of the extreme warm years after the 1990s.The province was divided into 5 planting zones according to the results of cluster analysis.The partition of 2 standard climate years in 1961-1990 and 1971-2000 was basically identical.Compared with the demarcation line of 1961-1990,the divisiory boundary of 1971-2000 showed a trend of northward movement.Since 1990s,there was a significant increase in temperature.The changes in division were greater from 1991 to 2005 and the trend of northward movement was more obvious.
