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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Supported by the National Science and Technology Support Program of China (2007BAC29B05), China Meteorological Administration Special Public Welfare Research Fund for Meteorological Profession (GYHY200806008 and GYHY201106021).
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Song, Y., Zhao, Y. & Wang, C. Changes of accumulated temperature, growing season and precipitation in the North China Plain from 1961 to 2009. Acta Meteorol Sin 25, 534–543 (2011). https://doi.org/10.1007/s13351-011-0412-1
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DOI: https://doi.org/10.1007/s13351-011-0412-1