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Abstract
Using the high-quality observed meteorological data, changes of the thermal conditions and precipitation
over the North China Plain from 1961 to 2009 were examined. Trends of accumulated temperature and
negative temperature, growing season duration, as well as seasonal and annual rainfalls at 48 stations were
analyzed. The results show that the accumulated temperature increased significantly by 348.5°C day due to
global warming during 1961-2009 while the absolute accumulated negative temperature decreased apparently
by 175.3°C day. The start of growing season displayed a significant negative trend of -14.3 days during 1961-
2009, but the end of growing season delayed insignificantly by 6.7 days. As a result, the length of growing
season increased by 21.0 days. The annual and autumn rainfalls decreased slightly while summer rainfall and
summer rainy days decreased significantly. In contrast, spring rainfall increased slightly without significant
trends. All the results indicate that the thermal conditions were improved to benefit the crop growth over
the North China Plain during 1961-2009, and the decreasing annual and summer rainfalls had no direct
negative impact on the crop growth. But the decreasing summer rainfall was likely to in°uence the water
resources in North China, especially the underground water, reservoir water, as well as river runoff, which
would have in°uenced the irrigation of agriculture.
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Citation
SONG Yanling, ZHAO Yanxia, WANG Chunyi. 2011: Changes of Accumulated Temperature, Growing Season and Precipitation in the North China Plain from 1961 to 2009. Journal of Meteorological Research, 25(4): 534-543.
SONG Yanling, ZHAO Yanxia, WANG Chunyi. 2011: Changes of Accumulated Temperature, Growing Season and Precipitation in the North China Plain from 1961 to 2009. Journal of Meteorological Research, 25(4): 534-543.
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SONG Yanling, ZHAO Yanxia, WANG Chunyi. 2011: Changes of Accumulated Temperature, Growing Season and Precipitation in the North China Plain from 1961 to 2009. Journal of Meteorological Research, 25(4): 534-543.
SONG Yanling, ZHAO Yanxia, WANG Chunyi. 2011: Changes of Accumulated Temperature, Growing Season and Precipitation in the North China Plain from 1961 to 2009. Journal of Meteorological Research, 25(4): 534-543.
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