搜索结果: 91-105 共查到“知识库 动力气象学”相关记录277条 . 查询时间(8.106 秒)
高温热浪与干热风的危害特征比较研究
高温热浪 干热风 危害特征 比较研究
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2009/11/10
综述了高温热浪与干热风气象灾害在危害特点、类型与指标、气候特征、形成原因、对全球气候变暖的响应、防御技术与应对策略等6个方面的内容。并对两者进行了比较，高温热浪和干热风既有共同点又有区别和联系，两者均是一种较短时间尺度的重大天气灾害，高温低湿是两者主要的基本天气特征; 在形成原因——主要是环流特征异常和对全球气候的响应等方面两者基本上是一致的; 在同一地域同一时间两者也可能同时发生; 在干旱季...
The COSMO-LEPS mesoscale ensemble system:validation of the methodology and verification
COSMO-LEPS mesoscale ensemble system validation methodology verification
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2009/11/9
The limited-area ensemble prediction system COSMO-LEPS has been running every day at ECMWF since November 2002. A number of runs of the non-hydrostatic limited-area model Lokal Modell (LM) are availab...
Long-term predictability of mean daily temperature data
Long-term predictability mean daily temperature data
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2009/11/9
We quantify the long-term predictability of global mean daily temperature data by means of the Rényi entropy of second order K2. We are interested in the yearly amplitude fluctuations of the temperatu...
Nonlinear multivariable analysis of SOI and local precipitation and temperature
Nonlinear multivariable analysis SOI local precipitation and temperature
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2009/11/9
Global climate variability affects important local hydro-meteorological variables like precipitation and temperature. The Southern Oscillation (SO) is an easily quantifiable major driving force that g...
Nonlinear correlations of daily temperature records over land
Nonlinear correlations daily temperature records
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2009/11/9
We present a near global statistics on the correlation properties of daily temperature records. Data from terrestrial meteorological stations in the Global Daily Climatology Network are analyzed by me...
Multi-parameter uncertainty analysis of a bifurcation point
Multi-parameter uncertainty analysis bifurcation point
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2009/11/9
Parameter uncertainty analysis of climate models has become a standard approach for model validation and testing their sensitivity. Here we present a novel approach that allows one to estimate the rob...
通过数值模拟，结果表明风场的垂直结构和热力的共同作用是越山气流扰动不稳定发展和背风波形成的重要条件；水汽作用造成的垂直运动随高度呈抛物线分布；端流扩散作用不利于上升运动形成。结果还表明，雨峰与上升运动有很好的对应的关系，证实了秦岭山脉和越山偏南气流对陕西降不的南北分布有重要贡献。
Modeling pairwise dependencies in precipitation intensities
Modeling pairwise precipitation intensities
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2009/11/3
In statistics, extreme events are classically defined as maxima over a block length (e.g. annual maxima of daily precipitation) or as exceedances above a given large threshold. These definitions allow...
Prediction of minimum temperatures in an alpine region by linear and non-linear post-processing of meteorological models
minimum temperatures alpine region linear and non-linear post-processing meteorological models
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2009/11/3
Model Output Statistics (MOS) refers to a method of post-processing the direct outputs of numerical weather prediction (NWP) models in order to reduce the biases introduced by a coarse horizontal reso...
Limitations of wind power availability over Europe:a conceptual study
Limitations wind power availability conceptual study
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2009/11/2
Wind field statistics are evaluated from the ERA-40 data bank covering a period of 44 years with a temporal resolution of 6 h. Instantaneous wind speed values are provided in geographic cells of size ...
Hadley环流上升支特征及其与东亚臭氧变化的关系
Hadley环流 臭氧混合比 平均经圈环流 质量流函数
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2009/10/29
利用NCEP/NCAR再分析风场资料和TOMS臭氧总量资料以及ECMWF臭氧混合比资料，用叠加计算方案分析了1992～2002年整10?a的平均经圈环流(MMC)气候态特征；在此基础上定义了Hadley环流上升支强度指数（HAI），研究Hadley环流上升支与东亚地区臭氧的相关关系．结果表明：南、北半球的2个Hadley环流圈的公共上升支具有明显的季节特征；冬、夏HAI(WHAI/SHAI)均表现...
冬季Hadley环流活动与大气臭氧变化的关系研究
质量流函数 臭氧质量混合比 Hadley环流
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2009/10/29
利用1957年9月到2002年8月,共540个月的ECMWF的经向风和臭氧质量混合比资料,分析研究了冬季Hadley环流强弱特征的变化对臭氧变化的影响.分析指出在冬季伴随Hadley环流的增强,其中心南移,高度升高,臭氧在对流层增加,平流层减少,臭氧总量呈现出减少的趋.Hadley环流的增强,中心南移,高度升高以及臭氧在对流层的增加对全球变暖是正反馈,而平流层臭氧减少,臭氧总量减少对全球变暖...
无人机探测“海鸥”台风中心附近的资料初步分析
无人机 探测 台风 初步分析
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2009/9/17
2008年7月18日和19日，在中国大陆首次利用无人机探测手段对台风“海鸥”（0807号）进行了探测，根据19日台风减弱为热带风暴过程中的飞行探测资料，初步分析结果如下：飞行高度500 m，飞行时间近3小时，距离台风中心最近距离约为100 km，获取了探测期间的全部气象要素数据（温度、相对湿度、气压和风速），数据获取率达到90%以上。探测期间内的气压平均值为949.1±9.7 hPa，温度平均值为...
南京市热岛效应变化时空特征及其与土地利用变化的关系
城市热岛效应 土地利用变化 时空演变 遥感
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2009/9/17
利用遥感数据和气象统计数据分析自1985年以来南京市热岛效应变化的时空特征及其与土地利用变化的关系。结果表明：自1985年以来，南京市热岛效应强度和范围在增长。南京市的年均温逐年上升，与郊区六合县的温差呈上升趋势；南京市建成区内4级热岛效应面积增加了107.88km2。热岛效应增长在空间上存在差异，大厂>雨花台>市辖区>栖霞>浦口>江宁。南京市土地利用变化的结果使得热岛效应空间分布更广泛，城镇居民...
Comparisons of the Generalized Potential Temperature in Moist Atmosphere with the Equivalent Potential Temperature in Saturated Moist Atmosphere
Generalized Potential Temperature Moist Atmosphere Equivalent Potential Temperature
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2009/9/4
The real tropospheric atmosphere is neither absolutely dry nor completely saturated. It is in general moist but not saturated. Here the generalized potential temperature (GPT) was introduced to descri...