Variation of Temperature and Frost free Period in Different Time Scales in Northeast China

doi:10.3969/j.issn.1000-6362.2015.01.001

Abstract

Abstract: Based on observed data from 71 meteorological stations in Northeast China from 1961 to 2012，the variation of temperature and frost free period in decade scale，annual scale，month scale，and tenday scale，were analyzed.The results showed that both contour lines of temperature and frostfreeperiod moved northward in decade scale，and maximum value occurred in 1980-1999.Compared with 1961-1979，contour line of 3℃ temperature moved northward about 1latitude，and the area of temperature over 3℃ increased 1.14×10.5km2，and contour line of 155d frost free moved northward about 2.4 latitudes，and the area of frostfree 155d increased 2.02×10.5km2.The average temperature increasing rate in Northeast China was 0.30℃10y-1，and maximum increasing in winter at the rate of0.47℃10y-1.The frost free period increasing rate was 3.5d10y-1，and first/latest frost date delayed/advanced 8.1d and 9.8d，respectively.The temperature increasingrate in February was 0.8℃10y-1，which was key factor to large temperature increasing in winter.In which the final 10 days in February temperature increasing rate was 1.00℃10y-1.Climate warming might have some impacts on agricultural production and agro climatic zone in Northeast China，the results could provide references forheat resources utilization and crop cultivation under climate change.

Key words: Northeast China, Time scale, Temperature, No frost period

HU Qi，PAN Xue biao，ZHANG Dan，Yang Ning，Li Qiu yue，SHAO Chang xiu. Variation of Temperature and Frost free Period in Different Time Scales in Northeast China[J]. Chinese Journal of Agrometeorology, 2015, 36(01): 2-8.

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