西藏喜马拉雅冷杉年轮δ13C与气候意义

对采自青藏高原东南部林芝地区的喜马拉雅冷杉进行交叉定年后,分析了喜马拉雅冷杉年轮δ13C序列与气候要素之间的关系.去除大气CO2浓度升高导致大气CO2中δ13C下降和生长趋势的影响后,建立树轮δ13C值的残差序列△13C.利用附近林芝气象站的气象资料,分析了树轮△13C序列对气候要素的响应.结果表明: 冷杉δ13C的高频振荡与该地区前一年的9～11月降水和相对湿度存在较好的相关性,并存在强的滞后效应.通过建立回归方程重建了该区域的秋季(9～11)月相对湿度序列,解释方差达37.9%.重建相对湿度序列表明1800年前相对湿度变化周期较短、变幅较小,1800～2000年则相反.     

宇宙尘埃流入量与地球气候冷暖关系分析

宇宙尘埃流入量的多少具１０万年的周期变化。宇宙尘埃流入量增加，地球气候变暖，出现间冰期环境；当宇宙尘埃流入量减少，地球气候变冷，出现冰期环境，这是由于宇宙法埃对短波辐射和长波辐射的热效应不同所致。     

洛阳盆地全新世气候环境

根据伊洛河二级阶地皂角树剖面沉积物质的理化分析数据，推断洛阳盆了全新世气候环境特点是；早期冷湿，中期温暖湿润，晚期温暖半湿润，自１．２万ａＢ．Ｐ．以来存在９个温湿和９个干旱亚阶段。     

试论厄尼诺与山东降水作物产量的关系

厄尼诺现象使山东夏季降水偏少，强度越大，干旱越重，用降水与分离的气候产量进行回归分析的到需水量，进而评价其满足程度。厄尼诺强年所有作物减产，弱年与发生时间有关。     

东部非渊的自然带与气候状况的关系

用东部非洲的气候资料了可能用量与土壤水分平衡，并分析了年降水量，年可能蒸散量及两者之间的比值和土壤水分平衡的分布情况，探讨了东部非洲的自然带与气候状况的关系。     

山东泰安近53年的气候变化及其对果品生产的影响

文章对泰安市近53年的气候变化规律作了分析．发现谊地区气温上升．降水减少，日照降低,对全球变化响应显著．运用近53年的气候特征值重点对苹果作了气候适宜性评价．表明苹果的主要限制性因素是高温．水果产量和气候特征值的相关分析发现．高温已经对苹果和梨的产量产生了负面影响．果品结构正在调整中．苹果的比例在下降．其他优质高产品种桃子、葡萄、樱桃等的比重在增加．     

明清时期广东地区气候变冷对社会经济发展的影响

通过对比广东15世纪末至19世纪末即LIA期间的气象灾害、战乱、人口发展等几方面的数据,研究了明清时期气候变冷对广东地区社会经济发展的影响,发现这一时期农业生产的衰退、生态环境的恶化、战乱和农民起义的增多、人口发展的减缓以及瘟疫次数的增加,都与气候变冷有明显的相关性.同时指出,气候变冷的各个可能的影响结果之间,又有着密切的联系,它们相互影响,相互作用,严重阻碍了明清时期广东社会经济的正常发展.     

Some evidence of drying trend over northern China from 1951 to 2004

The surface wetness index, Palmer drought sererity index and the retrieval of soil moisture over China were calculated using monthly precipitation and monthly mean surface air temperature. Based on the contrast analysis of the variation of the above three indices and precipitation, the dry/wet spatio-temporal pattern of northern China in the last 54 years was revealed, and the evidence of drying trend over northern China was analyzed, especially. The results show the following four facts: (1) The drying trend is the main characteristic of the eastern part of Northwest China and the central part of North China since the 1980s and it was enhanced in the last 15 years mainly due to the precipitation decrease and the temperature increase; (2) During the last 54 years, there was only one dry/wet shift at the interdecadal scale occurring in the eastern part of Northwest China and the central part of North China in the late 1970s, which was related to 1977/1978 global abrupt change, whereas there were three shifts in Northeast China, one was in the mid 1990s and the other two were in 1965 and 1983, respectively; (3) Unlike the variation trend of other subregions of northern China, the western part of Northwest China is currently located in a relatively wetting period, which is weak-ened due to the temperature increase; (4) The extreme drought frequency is obviously increasing in the eastern part of Northwest China, the central part of North China and Northeast China since the 1980s, which is closely related to the precipitation decrease and temperature increase in these subregions.     

并行串级控制系统及其性能分析

文章在对并行串级控制系统的结构进行介绍的基础上,重点分析系统的抗扰动性能,通过对系统特征参数λ的定性和定量分析,揭示了并行串级控制系统抗扰动原理,并进行仿真予以验证,同时给出了该系统的使用范围.