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The snow-cover days over the middle and lower reaches of the Yangtze River （MLRYR） in the winter of 1670 were extracted from Chinese historical documents. By these records, the winter temperature anomalies （compared to the mean of 1961-1990） recorded at seven meteorological stations and the regional mean winter temperature were estimated. The results show that： （1） There was an average of about 30 snow-cover days over the MLRYR region in 1670, ranging from 11-20 days in Shanghai and eastern Zhejiang to 5140 days in eastern Hunan Province. The snow-cover days averaged about 40 days in Anqing and Nan- cheng, and ranged from 30 to 40 days in Quzhou, Jingdezhen, and Nanchang; and （2） the regional mean winter temperature in 1670 was estimated to be approximately 4.0 ℃ lower than that of 1961-1990. The maximum negative anomaly of 5.6℃ occurred in Nanchang and the minimum anomaly of-2.8 ℃ was detected in Quzhou. Both of these were lower than that of the coldest winter during the instrumental observation period of 1951-2010. This research could not only provide a method to es- timate historical climate extremes, but also provide a background to understand the recent instrumentally climate extremes. 相似文献
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安阳林州市有两座山十分奇怪,炎热夏季山洞里不热反而结出大块的冰柱、冰凌,冬天寒冷季节则往外冒热气。夏天山洞洞口结冰的时候,揭开冰块后当地就会落下鸡蛋大小 相似文献
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火山是地球内部与表层系统连接的纽带,是地球充满生机活力的体现.减轻大型火山喷发对全球气候和环境的影响是地球科学的重大研究主题.提出探索岩浆储库的累积组装和演变规律,研究火山喷发的触发机制,聚焦地球内、外层圈的相互作用,认识火山活动与全球气候和表层环境变化的互馈关系,构建火山地球工程的理论体系和技术框架,是减轻火山灾害对全人类不利影响的关键.其中,基于岩浆动力学和火山学的岩浆通道系统研究,将会为火山活动的预测和监测提供新的理论依据.火山活动的影响是全球性的.所以,我们要抢占先机,在深化火山喷发机制理论研究和构建减轻火山灾害影响的工程技术体系等方面有所作为. 相似文献
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2005年对于GIS软件企业来说,是最不平静的一年。这一年,是国家“十五”计划的最后一年．2006年是“十一五”计划的启动之年,在新的规划中,国家大力倡导自主创新、节约资源和区域协调发展这要求我们用更先进、更科学的方式调配和开发我们的自然资源．要求我们在管理自然资源时不仅要做到局部精细化．更要注重整体的宏观性,这正是GIS的专长之一。 相似文献