福建省金矿成矿地质条件与成矿远景   总被引：1，自引：1，他引：0  

翁朝峰 《福建地质》1998,17(1):24-34

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  相似文献   

试论南岭地区稻作起源问题     

翁齐浩 《热带地理》1998,18(1):72-79

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。  相似文献   

CLIMATIC CHARACTERISTICS OF NET RADIATION IN THE EARTH-ATMOSPHERE SYSTEM OVER CHINA^*          下载免费PDF全文

Weng Duming  Li Ju 《Acta Meteorologica Sinica》1996,10(2):247-256

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.  相似文献   

温度微结构的高空气球观测   总被引：2，自引：0，他引：2       下载免费PDF全文

曾宗泳  张骏  翁宁泉  龚知本 《大气科学》1997,21(3):379-384

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。  相似文献   

业务流程个性化和可视化的实现   总被引：1，自引：0，他引：1       下载免费PDF全文

曾沁  林钢  薛登智  翁向宇 《气象》2003,29(5):26-29

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。  相似文献   

Urban heat island monitoring and analysis using a non-parametric model: A case study of Indianapolis   总被引：1，自引：0，他引：1  

Umamaheshwaran Rajasekar  Qihao Weng 《ISPRS Journal of Photogrammetry and Remote Sensing》2009,64(1):86-96

A procedure for the monitoring an urban heat island (UHI) was developed and tested over a selected location in the Midwestern United States. Nine counties in central Indiana were selected and their UHI patterns were modeled. Moderate Resolution Imaging Spectroradiometer (MODIS) land surface temperature (LST) images taken in 2005 were used for the research. The images were sorted based on cloud cover over the study area. The resulting 94 day and night images were used for the modeling. The technique of process convolution was then applied to the images in order to characterize the UHIs. This process helped to characterize the LST data into a continuous surface and the UHI data into a series of Gaussian functions. The diurnal temperature profiles and UHI intensity attributes (minimum, maximum and magnitude) of the characterized images were analyzed for variations. Skin temperatures within any given image varied between 2–15 ^°C and 2–8 ^°C for the day and night images, respectively. The magnitude of the UHI varied from 1–5 ^°C and 1–3 ^°C over the daytime and nighttime images, respectively. Three dimensional (3-D) models of the day and night images were generated and visually explored for patterns through animation. A strong and clearly evident UHI was identified extending north of Marion County well into Hamilton County. This information coincides with the development and expansion of northern Marion County during the past few years in contrast to the southern part. To further explore these results, an Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) 2004 land use land cover (LULC) dataset was analyzed with respect to the characterized UHI. The areas with maximum heat signatures were found to have a strong correlation with impervious surfaces. The entire process of information extraction was automated in order to facilitate the mining of UHI patterns at a global scale. This research has proved to be promising approach for the modeling and mining of UHIs from large amount of remote sensing images. Furthermore, this research also aids in 3-D diachronic analysis.  相似文献   

Modelling dust distributions in the atmospheric boundary layer on Mars     

Peter A. Taylor  P-Y. Li  Diane V. Michelangeli  Jagruti Pathak  Wensong Weng 《Boundary-Layer Meteorology》2007,125(2):305-328

A time and height dependent eddy diffusion model is used to investigate possible scenarios for the size distribution of dust in the lower atmosphere of Mars. The dust is assumed to either have been advected from a distant source or to have originated locally. In the former case, the atmosphere is assumed to initially contain dust particles with sizes following a modified gamma distribution. Larger particles are deposited relatively rapidly while small particles are well mixed up to the maximum height of the afternoon boundary layer and are deposited more slowly. In other cases, a parameterization of the dust source at the surface is proposed. Model results show that smaller particles are rapidly mixed within the Martian boundary layer, while larger particles (r > 10 μm) are concentrated near the ground with a stronger diurnal cycle. In all simulations we assume that the initial concentration or surface source depend on a modified gamma function distribution. For small particles (cross- sectional area weighted mean radius, r_eff = 1.6 μm) distributions retain essentially the same form, though with variations in the mean and variance of the area-weighted radius, and the gamma function can be used to represent the particle size distribution reasonably well at most heights within the boundary layer. In the case of a surface source of larger particles (mean radius 50 μm) the modified gamma function does not fit the resulting particle size distribution. All results are normalised by a scaling factor that can be adjusted to correspond to an optical depth for assumed particle optical scattering properties.  相似文献   

北京地区PM₁₀浓度空间分布特征的综合变分分析   总被引：7，自引：0，他引：7       下载免费PDF全文

程兴宏徐祥德  陈尊裕丁国安李成才  翁永辉 《应用气象学报》2007,18(2):165-172

利用2003年10月北京地区PM₁₀浓度流动观测资料和同期MODIS AOD(Aerosol Optical Depth)高分辨率遥感资料，采用卫星遥感地面观测变分订正处理方法，综合分析了北京地区PM₁₀浓度的空间分布特征以及机动车排放的影响效应。动态观测试验结果表明:北京城区大部分为轻污染区, 北京近郊区PM₁₀浓度高值区沿环路呈环状分布，其中北京西南部、南部和东北部污染较严重，北京城郊街区PM₁₀的空间分布受机动车排放的影响较大。MODIS卫星遥感资料分析表明:北京城区及近郊区AOD值较远郊区高得多，AOD空间分布场中存在虚假高值区，AOD非均匀分布特征不明显。采取点面结合综合观测研究思路，运用卫星遥感地面观测综合变分分析方法，可以取得客观订正的显著效果。经地面实测PM₁₀浓度变分订正后的AOD变分场可以较高分辨率信息描述北京地区AOD的非均匀分布特征，弥补地面PM₁₀浓度观测的缺陷。  相似文献   

Deglaciation and Holocene climate change in the western Peruvian Andes     

Chengyu Weng  Mark B. Bush  Tom D. Dillehay  Michael W. Binford 《Quaternary Research》2006,66(1):87-96

  相似文献   

黄淮平原农业干旱预警系统研究   总被引：1，自引：0，他引：1  

厉玉昇  翁永辉  陈怀亮  董官臣  邹春辉  张雪芬 《气象科技》2005,(Z1)

采用区域气候模式与土壤水分模型相结合的技术,建立黄淮平原农业干旱预警系统。系统的气候模式采用NCAR的区域气候模式(RegCM2),为土壤水分模型提供所需的气象要素场数值预报。土壤水分模型采用适合于黄淮平原冬小麦、夏玉米等作物的土壤水分平衡方程。试运行结果表明,利用区域气候模式和土壤水分模型构建的区域性土壤水分模型,土壤水分预报的平均相对误差在15%以下,可以较好地模拟出土壤水分变化和干旱分布状况,可用于土壤水分预报和干旱监测。  相似文献