Changes of Accumulated Temperature, Growing Season and Precipitation in the North China Plain from 1961 to 2009 |
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Authors: | Yanling Song Yanxia Zhao Chunyi Wang |
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Affiliation: | SONG Yanling 1,ZHAO Yanxia 2,and WANG Chunyi 31 National Climate Center,China Meteorological Administration,Beijing 100081 2 Chinese Academy of Meteorological Sciences,Beijing 100081 3 Hainan Provincial Meteorological Service,Hainan 570203 |
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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 influence the
water resources in North China, especially the underground water, reservoir water, as well as river runoff, which would have
influenced the irrigation of agriculture. |
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Keywords: | North China Plain agriculture climate change |
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