Downscaling GCMs Using the Smooth Support Vector Machine Method to Predict Daily Precipitation in the Hanjiang Basin   总被引：5，自引：0，他引：5  

CHEN Hu  GUO Jing  XIONG Wei  GUO Shenglian  Chong-Yu XU 《大气科学进展》2010,27(2):274-284

General circulation models (GCMs) are often used in assessing the impact of climate change at global and continental scales. However, the climatic factors simulated by GCMs are inconsistent at comparatively smaller scales, such as individual river basins. In this study, a statistical downscaling approach based on the Smooth Support Vector Machine (SSVM) method was constructed to predict daily precipitation of the changed climate in the Hanjiang Basin. NCEP/NCAR reanalysis data were used to establish the sta...  相似文献   

Spatiotemporal Modeling of Monthly Precipitation in the Upper Shiyang River Watershed in West Central Gansu, Northwest China     

ZHANG Cunjie  C. P.-A. BOURQUE  SUN Landong  Q. K. HASSAN 《大气科学进展》2010,27(1):185-194

This paper outlines a methodology to estimate monthly precipitation surfaces at 1-km resolution for the Upper Shiyang River watershed(USRW) in northwest China.Generation of precipitation maps is based on the application of a four-variable genetic algorithm(GA) trained on 10 years of weather and ancillary data,i.e.,surface air temperature,relative humidity,Digital Elevation Model-derived estimates of elevation,and time of year collected at 29 weather stations in west-central Gansu and northern Qinghai provin...  相似文献   

柯坪地区1971-2008年沙尘天气特征分析     

蒋春燕  黄文君 《沙漠与绿洲气象(新疆气象)》2010,4(3):45-48

利用1971—2008年柯坪站的地面气象资料及周边气象站的气候整编资料,分析了该地区的沙尘天气变化特征。结果表明:该地区沙尘天气以浮尘为主,扬沙次之,沙尘暴最少;具有明显的季节变化和年际变化,每年3—9月是沙尘天气的多发时段;浮尘年日数近38 a来无明显变化,沙尘暴和扬沙日数呈明显减少趋势;沙尘天气总体分布自东向西逐渐增多。沙尘天气与当地降水量和大风的关系密切,降水偏多的年份,沙尘天气偏少,在吹偏西北风时易出现沙尘天气。  相似文献   

巩义西村煤普查项目初步查明煤炭资源储量逾八亿吨     

周强  刘文忠  黄金梅 《河南国土资源》2009,(7)

2009年6月26日,从河南省地矿局第一地质工程院巩义市西村煤普查项目施工现场传来喜讯:在1372.20米深处,钻孔揭露了5.85米厚的主采煤层。据此保守估算,项目初步查明煤炭资源储量逾8亿吨。主要可采二1煤层为低-中灰、特低硫、低磷无烟煤。  相似文献   

河南地热矿泉水发展前景堪忧     

郑阳 《河南国土资源》2008,(3):49

近日,记者从河南省矿业协会地热矿泉水专业委员会获悉,到2006年底,河南省经过鉴定的水源地有近200处,但全省地热矿泉水已开采登记的企业从几年前的60余家下降到目前的13家,而仅存的13家中,多数厂家经营都举步维艰,面临倒闭。全省矿泉水可开采资源量为138.67万吨,实际年总产量不超过15万吨,河南省矿泉水企业没有一家全省性的品牌,发展前景令人堪忧。  相似文献   

军用气象之中心工作弹道风之测算法     

吕炯 《气象学报》1936,12(3):121-132

近世战术,全仗科学,尽人皆知。然若仅有坚甲利兵,而於天时地理,未能预测,则亦往往归於失败。挽近以来,飞航事业,突飞猛进,将来空中之战争,较之陆地海洋,尤为重要。故气象一科,亦为近世研究战术者所不可或缺之知识;即以炮兵而论,其需要气象学上之知识,亦复不少。兹篇所述,为弹道风之测算法;盖炮弹在空中之路径,常受大气中气流之影响而改变。故欲求其炮无处发,发而命  相似文献   

Annual precipitation gray forecast in disaster year of Chedaren debris flow     

MENG Fanqi  LI Guangjie College of Construction Engineering  Jilin University  Changchun  China 《东北亚地学研究》2009,12(2):105-108

The Chedaren ravine belongs to high-prone areas of debris flow in Jilin Province, which threaten the local people＇ s life and security seriously. The authors used the residual correction theory to amend the GM （ 1, 1 ） model and forecast annual precipitation in disaster year of the Chedaren ravine ; it provides scientific foundation for early warning of debris flow disaster in the rainy season based on weather forecast. The prediction resuits show that annual precipitation is 724.7 mm in 2009 ; the region will probably occur large-scale debris flow during the rainy season.  相似文献   

基于Excel的报表生成工具的设计与实现     

黄锦  唐慧佳 《成都信息工程学院学报》2009,24(6):577-581

介绍了可配置报表的模型及其思想,并在此基础上,探讨了利用xml配置文件开发基于Excel的可配置报表生成工具,实现了数据与报表样式分离.工具包含两个部分:报表配置文件和报表生成引擎.  相似文献   

Micromorphological evidences of climatic change in Yazd region, Iran   总被引：1，自引：0，他引：1  

Ruhollah Taghizadeh Mehrjardi  Shahla Mahmoodi  Ahmad Heidari  Ali Akbarzadeh 《山地科学学报》2009,6(2):162-172

The fact of, present is the key of the past, will help us to use paleosols properties as indicators of the ecological characteristics of past .time, particularly the paleoclimate. In this respect the micro- morphological properties showed to be a very good indicator. Therefore, for investigating of climate change in Ardakan-Yazd plain, Central Iran 9 pedons were digged and described. Yazd has an arid climate with less than 100 mm annual precipitation and more than 22℃ mean annual temperature （Aridic-hyper thermic soil moisture and temperature regions, respectively）. Based on the morphological and physicochemical analysis Arglic, Calcic and Gypsic diagnostic horizons have been distinguished in these soils. Thin section studied showed that the illuviated form of clay includes, infillings on channel, coating on pendant, on nodules and on grains, at lower depths and also juxtaposed calcite needles on void argillan at upper part of the profiles. Mineralogical result showed fine clay in arglic horizon, too. Considering depth and forms of these pedofeatures, we concluded that, the observed illuviated clays at lower depth must be the result of the more humid climate of the past, where the carbonates have been removed completely as pendant, nodules or coating to considerable depth, following processes, clay has been dispersed and also trans located to these depths. In contrast to these features, the juxtaposed needle calcite at the shallower depth is probably the result of drier climate of today.  相似文献   

地基GPS探测水汽的发展与气象业务应用     

郭洁  李国平 《大地测量与地球动力学》2007,27(Z1):35-42

介绍了地基GPS探测大气可降水量在国内外的发展、灾害性天气监测分析预报、中尺度数值预报模式初始场、全球气候变化的监测和分析、人工影响天气作业、三维水汽场层析分析以及GPS探测水汽在气象领域中应用的现状.  相似文献