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971.
Based on dynastic period division and AMS ^14 C dating performed on the sedimentary layers at Zhongba and Yuxi sites,and also the analysis of Na,Ca and Mg of 201 sedimentary samples from Zhongba site and that of Ca and Na in 47 sedimentary samples from Yuxi by using an inductively coupled plasma-mass spectrometry(ICP),we found that there were 35 time periods when the contents of Ca and Na were reversely correlated,i.e.whenever the content of Ca was the highest,the content of Na was the lowest,and vice versa. Among them,there were 21 time periods when the content of Ca was the highest,and Na was the lowest,indicating that there were about 21 prosperous periods of ancient salt production at Zhongba site since 3000BC.Other 14 time periods with the peak values of Na while the low values of Ca indicate 14 declined periods of salt production at Zhongba site since 3000BC.The conclusion obtained from the reverse relationship between Ca and Na contents in this paper is consistent with that"the salt production at Zhongba site started in the new stone age,developed in the Xia and Shang dynasties,reached at the heyday in periods from the Western Zhou to the Han Dynasties,maintained stable to develop in the Tang and the Song dynasties,and gradually declined after the Song Dynasty because the sea salt were conveyed into Sichuan region,however,still had production in the 1970s-1980s",educed from archeological exploration.All the above mentioned results indicate that there is a reverse relationship obviously between the contents of Na and Ca in sediments at Zhongba site for ancient salt production,which can be used to reveal the process of rise and decline of ancient salt industry at Zhongba site. 相似文献
972.
973.
974.
青藏高原夏季风对长江中下游气候的影响及与南亚高压的联系 总被引:1,自引:0,他引:1
应用1951~2011年NCEP/NCAR第一套逐月再分析资料和国家气候中心提供的全国160站逐月的降水和气温资料.通过相关分析得出该指数与长江中下游的夏季降水(温度)存在正(负)相关(均通过了95%的显著性检验).高原夏季风存在明显的年际和年代际变化,1979年是其突变点.高原夏季风与副热带高压以及南亚高压的特征参数之间存在较好的相关性.高原夏季风偏强(弱)时,南亚高压出现青藏高原(伊朗高原)模态,强度减弱(增强)且东伸(西退),副高增强(减弱)且西伸(东退).南亚高压的各个特征参数都存在共同2~4年周期振荡,且高原夏季风与南亚高压主中心的经度(纬度)在3~5年(3~4年以及5~6年)上的显著关系最好. 相似文献
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976.
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978.
The amplitude and rhythm of temperature changes at inter-decadal and inter-centennial timescale were studied, based on the winter-half year temperature change series reconstructed from historical phenological events in eastern China for the past 2000 years, together with the temperature change simulation from ECHO-G model for the past 1000 years, and the quasi-periods of temperature fluctuation were discussed by using wavelet analysis. The results indicate: 1) the maximal amplitude of winter half-year temperature change in eastern China at decadal and centennial scale, was above 2℃ and 0.5-1.0℃ respectively. The reconstructed result indicates that the amplitude of warming during the 20th century was identical with the maximum amplitude before the 20th century in eastern China, but the simulated result suggests that the amplitude of warming has exceeded the maximum amplitude. 2) The rhythms of temperature change at centennial to millennial scale in eastern China were about 100-year, 250-year, 400-year, 600-year and 1000-year. The 20th century, the 1st-3rd century and the 9th-13th century were warm peaks at inter-centennial scale as well as at millennial scale. It is implicated that the warming during the 20th century should be attributed to not only anthropogenic effect, but also natural climate variation. 相似文献
979.
数值预报特别是集合预报技术大大提高了对极端天气的预报能力,目前对于温度、风、降水等要素,欧洲中心基于集合预报产品计算的极端指数产品为其极端性提供了定量化依据。但目前尚没有应用于业务预报的强对流天气极端指数产品,本文统计了与强对流天气密切相关的物理量,并计算了其极端天气指数,统计了极端天气指数在不同强对流天气中的阈值分布。结果表明,极端天气指数与强对流天气有密切的关系,且不同类型的强对流天气极端指数的分布和阈值具有各自的特点。基于上述结果,利用极端指数和模式降水资料,使用支持向量机方法,建立了不同类型强对流天气的客观预报方法,为业务预报极端强对流天气提供客观支持产品。 相似文献
980.
中国北方夏半年最长连续无降水日数的变化特征 总被引:18,自引:2,他引:18
利用1951-2004年中国北方各气象台站夏半年逐日降水资料,建立最长连续无降水日数时间序列,采用经验模态分解(EMD)求出该序列的本征模态函数(IMF),分析原序列内在的多尺度振荡变化.用小波分析原序列的突变.结果表明,连续无降水日数的变化主要是由IMF1、IMF2和IMF3这3个本征模态构成,3-4 a、8-10 a尺度的振荡对整个变化起主要作用.近50年来,最长连续无降水日数呈线性增加趋势;显著增加的年份在1960年和1994年前后,与干旱现象的发生有紧密的联系. 相似文献