【摘 要】
：
Based on the glacier area variation records in the typical regions of China moni-tored by remote sensing, as well as the meteorological data of air temperature and precipitation from 139 stations and
【出 处】
：
Journal of Geographical Sciences
论文部分内容阅读
Based on the glacier area variation records in the typical regions of China moni-tored by remote sensing, as well as the meteorological data of air temperature and precipitation from 139 stations and the 0℃ isotherm height from 28 stations, the glacier
其他文献
Climatic conditions are difficult to obtain in high mountain regions due to few meteorological stations and, if any, their poorly representative location designed for convenient operation. Fortunately
在瓜州四工和桥子天然胡杨林区设置两个样方,采用相邻格子法进行每木调查,建立胡杨种群年龄结构和存活曲线,分析其动态量化特征。结果表明,研究区胡杨种群的年龄结构不完整,大体呈偏正态分布型,为衰退种群。不同生境胡杨种群年龄结构差异显著。其中,桥子缺失幼苗和Ⅷ-Ⅺ级大树、老树,幼树较多,中树最多,占总数的84.91%,林分年轻,十分稠密、相对矮小;四工幼苗和Ⅲ级中树缺失,幼树甚少,中、大树比例高,分别占总
Based on the daily precipitation data of 27 meteorological stations from 1960 to 2009 in the Huaihe River Basin, spatio-temporal trend and statistical distribution of extreme precipitation events in t
Using the daily temperature data of 95 meteorological stations from Si-chuan-Chongqing Region and its surrounding areas, this paper adopted these methods (e.g., linear regression, trend coefficient, g
通过在西鄂尔多斯地区几年的植物标本采集以及参考前人对该地区植物名录的记载,对西鄂尔多斯地区野生维管植物种类组成、生活型、水分生态类型及植物区系地理成分进行了分析研究。结果表明:①西鄂尔多斯地区的野生维管植物共有64科、215属、433种;②植物的生活型以多年生草本为主,占52.66%,其他为乔木占0.69%、灌木占14.09%、半灌木占6.93%、一或二年生草本占24.25%、草质藤本占0.92%
Based on China homogenized land surface air temperature and the National Centers for Environmental Prediction/Department of Energy (NCEP/DOE) Atmospheric Model Intercomparison Project (AMIP)-Ⅱ Reanaly
Drought is one of the most destructive disasters in the Lancang River Basin, which is an ungauged basin with strong heterogeneity on terrain and climate. Our validation suggested the version-6 monthly
通过对MODIS云量数字产品与气象站云量观测资料的对比分析,发现两者间存在较大偏差。本文以气象站观测云量资料为基准,提出了差值订正、比值订正、差值混合订正、比值混合订正和归一化混合订正5种MODIS云量数字产品的订正方法。结果表明:5种订正方法均有效,其中比值订正法最简单易行,且效果最好,是基于地面观测资料MODIS云量数字产品的最优订正方法。订正后的MODIS云量与气象站观测云量在空间分布特征和
冲击起沙是最重要的起沙方式。鉴于Lu和Shao提出的体积模型的不足,通过分析沙床受到冲击后应力的传递规律,类比于电子的跃迁模型,提出了冲击起沙的跃迁模型来解决冲击起沙问题。该模型的基本思想是,沙粒冲击沙床时,能量会沿冲击点向周围粒子扩散,当某一粒子获得的能量大于跃出所需要的能量时,该粒子即从床面跃出;多余的能量将转化为该粒子的跃出初动能。冲击起沙问题由此变成了一个研究跃出能量的大小和能量传输规律的
利用中尺度区域预报模式系统对库姆塔格沙漠及其周边地区春季近地层风场与温度场分布特征进行了模拟和分析。结果发现,受青藏高原地形影响,偏北气流向南运行在途经库姆塔格沙漠的过程中发生3个分支:①在沙漠东部气流逐渐转变为西北风吹向甘肃省;②中西部气流以较强的东北风流向塔克拉玛干沙漠;③另一部分气流继续顺势南下流入青海省。沙漠区域温度从北向南逐渐降低,在青海省的边界上出现一个低温带,然后温度又开始增加。