农田风状况及其模式

本文讨论了农田中风速的水平和铅直分布的基本规律性。指出农田植被中的风速廓线具有上下不对称的“S”型分布。分析了农田植被中风速水平和铅直分布廓线常见模式的缺点,在理论分析和经验拟合的基础上提出了新的描述农田植被中风速的通用模式。按此模式计算的平均风速,无论水平分布或铅直廓线都与实际情况比较一致。     

植被内水平风速脉动特征

利用QDF型热线微风仪在农田植被内进行了水平风速脉动的观测。初步认为,植被内水平风速脉动具有比裸地湍流度大、脉动强度小、短周期振动强、湍流积分尺度小的特征,且随时间变化平稳,其时间结构函数基本符合“2/3”幂律(τ≤16秒)。     

福建省金矿成矿地质条件与成矿远景

福建省金矿与地层、构造、岩浆岩等成矿地质条件关系密切,金矿赋矿层位有８个,其中以前寒武纪麻源群、龙北溪组和中生代火山岩、火山碎屑岩层位为最主要。金矿主要分布在区域性断裂、火山构造、北东向与北西向两组断裂复合部位及火山基底起部位,韧性剪切带、推覆（剥离）构造发育地段,是金矿重要成矿部位。金矿成矿时代主要有前寒武纪和燕山期两个成矿期,两者在成矿时间上显示继承性,在空间上具有相关性。金矿化在前寒武纪与中     

试论南岭地区稻作起源问题

农业起源的研究具有很大有实现意义。通过对大量资源的研究分析,指出并论述了稻作起源地应具备的四个必要条件（即野生稻的古地理分布、适合的生态环境、对植物栽培性能及生态条件和农时物候的兴趣与了解、长期的人类存在和活动）和四个参考条件（包括稻作遗存、生产工具、语言学证据、民族学证据等）,认为南岭地区具有这些条件,因而是我国稻作起源地一部分。     

CLIMATIC CHARACTERISTICS OF NET RADIATION IN THE EARTH-ATMOSPHERE SYSTEM OVER CHINA*

Investigated are effects of the total cloudiness and other factors on earth-atmosphere net radiation(EANR) and analyzed is its relation to other components and ground surface net radiation in the context of ERBE and ISCCP.Evidence suggests that planetary scale albedo and earth-atmosphere short wave absorption radiation have maximum effect on the net radiation under study,with the influence of cloud and latitude displayed predominantly through the two factors;OLR has relatively weak effect;the earth-atmosphere net radiation is well correlated with surface net radiation.Analysis is also performed of the geographic distribution of the earth-atmosphere net radiation throughout China,and the annual curve of the net radiation on a local basis is marked by high(low) value in summer(winter) with the impact of factors.including total cloudiness responsible largely for the shift of the months with maximum.     

温度微结构的高空气球观测

本文给出了在河北省香河县的一次高空气球垂直探测大气温度起伏的主要结果。由气球吊篮上端同一水平线上三个钨丝温度计测量的温度起伏计算出不同水平和垂直距离的湍流结构常数。结果表明:大气在大于0.33～1.07 m的范围满足Kolmogorov的2/3定律，垂直方向温度谱分析表明-5/3幂率区可达20 m以上。文章还讨论了小尺度湍流的各向同性问题。     

业务流程个性化和可视化的实现

引入面向对象设计的思想，提出了业务流程组件的概念，通过通用的业务流程组件的建模，并将其参数化而使得业务流程平台成为根据用户权限而可以自由进行可视化组装的工作平台。设计了新的会商流程，实现了天气预报会商的多媒体化，同时输出多媒体的天气预报幻灯片，作为台站之间交流的信息产品。     

福建石牛山水蚀花岗岩石蛋地貌特征及成因研究

石牛山主峰出露晚白垩世石牛山组晚期侵入相钾长花岗斑岩,山体浑厚壮观,石蛋千姿百态。石蛋、石堡及崖壁上分布着深浅不一的石脊、石槽及大小不同的石臼、石盆、石穴等微地貌,构成独具特色的“水蚀花岗岩石蛋地貌”。经研究,钾长花岗斑岩是形成水蚀花岗岩石蛋的物质基础,风化剥蚀、大气降水击蚀及其流水侵蚀是形成石脊、石槽、石臼、石盆、石穴的主要外动力地质作用。     

基于数字高程模型的水系自动生成

为从数字高程模型(DEM)中自动提取区域水流特征,分析了DEM中地形的形态特征,并进行洼地填充和平地抬升的预处理,应用坡面流模拟方法进行了水流方向的确定及水流方向数字阵列的生成,最后根据水流方向阵列和河流栅格网络图生成需要的水系,其结果与手工数字化的水系基本一致,证明该方法是有效的。     

Deep origin of Cenozoic volcanoes in Northeast China revealed by 3-D electrical structure

The three-dimensional(3-D)electrical structure of the upper-mantle was used to examine the deep origins of and relationship among the Cenozoic volcanoes located in Northeast China(NEC).High-quality,long-period magnetotelluric(LMT)full-impedance tensor data were collected in NEC and subjected to 3-D Gauss-Newton inversion in order to construct a resistivity model.The resulting model reveals the presence of multiple localized low-resistivity anomalies(LRAs)within the high resistivity lithosphere beneath NEC.These LRAs partially coincide with Cenozoic volcanoes on the surface.Three LRAs that form a larger,annular LRA were observed in the deep upper mantle beneath the Songliao Basin,whereas vein-like LRAs were found in the asthenosphere that connect the lithosphere and deep upper mantle.Petrophysical analyses suggest that the LRAs may have been caused by fluid-induced melting.Based on our electrical model,we propose that,following dehydration of the subducted Western Pacific slab into the mantle transition zone(MTZ)beneath NEC,the released water migrated upward and caused partial melting at the top of the MTZ beneath the Songliao Basin.Under the effect of buoyancy,the melted mantle formed a thermal upwelling that caused melting of asthenosphere before diapiring at the base of the dry lithosphere.The magma then penetrated structural boundaries(such as thinner,weaker,or activated suture zones)and finally reached the Earth's surface.This melting and upwelling of hot mantle materials may have resulted in large-scale volcanism in the region throughout the Cenozoic,including the eruption of Changbai Mountain and Halaha Volcanoes.Our results suggest that the Cenozoic NEC volcanoes may all share a similar mode of genesis,and probably originated from the annular LRA in the deep upper mantle.