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利用逐日NCEP/NCAR位势高度场资料,通过Barnes带通滤波对哈尔滨地区2004年7月2日暴雨过程中高度场进行尺度分离。结果表明Barnes带通滤波方法能很好地得到常规资料不易分析出的中尺度天气系统,并分析出中尺度扰动与暴雨落区有很好的对应关系。 相似文献
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使用带通滤波方法分析了中尺度扰动与湖北省暴雨之间的关系,得出一些有一定预报意义的暴雨中尺度扰动场概念模型。 相似文献
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几种滤波器对地面飑线场的中尺度滤波试验 总被引:4,自引:0,他引:4
本文用Barnes带通滤波法,二十五点格式滤波法,对含有地面幅合线和飑线的地面加密观测资料和客观分析资料进行了中尺度滤波试验,结果表明,三种滤波器的作用结果都胡有效突出地面辐合线和飑线的中尺度特征,其中Barnes法的性能和结果较理想,二十五点法和高阶高通法各有特点。 相似文献
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本文在高斯权重函数客观分析方法的基础上,设计了一种新的客观分析办法。其优点是较高斯方法所得结果能更好地保留原始场的中尺度信息,使短波与中尺度波动被明显截断。用此方法构造的中尺度带通滤波器具有较好的滤波效果。上述方案已用BASIC语言在IBM微机上实现,比较适合地、市级气象台使用。 相似文献
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从一次大暴雨过程看大中尺度间的相互作用 总被引:2,自引:0,他引:2
应用大尺度物理量场诊断分析和中尺度带通滤波处理技术,对1994年6月29日发生在山东的一次大暴雨过程机制进行了分析。结果表明,大尺度θse锋区、水汽强烈输送、大气潜在不稳定等是大暴雨发生的有利环境条件;而经带通滤波得到的中尺度涡旋、切变线则是直接造成山东此次大暴雨发生的影响系统;中尺度涡旋、切变线与大尺度物理量场关系密切。 相似文献
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云南春季冰雹、大风天气的中尺度扰动特征 总被引:4,自引:0,他引:4
应用Barnus带通滤波方法,对1997年春季两次发生在滇南的冰雹、大风天气进行滤波分析,结果表明:冰雹大风发生前,昆明准确止锋附近低层有中尺度的扰动波列通过,风雹地区包括一个上升运动中和下沉运动中心。 相似文献
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The networking status of journals reflects their academic influence among peer journals. This paper analyzes the cited and citing environments of this journal, Advances in Atmospheric Sciences (Adv. Atmos. Sci.), using methods from social network analysis. Since its initial publication, Adv. Atmos. Sci. has been actively participating in the international journal environment and international journals are frequently cited in Adv. Atmos. Sci. Particularly, this journal is intensely interrelated with its international peer journals in terms of their similar citing patterns. The international influence of Adv. Atmos. Sci. is comparatively bigger than other Chinese SCI journals in atmospheric sciences as reffected by total cites to Adv. Atmos. Sci. and the total number of international journals citing it. The academic visibility of Adv. Atmos. Sci. is continuing to improve in the international research community as the number of reference citation it receives in its peer journals internationally increases over time. 相似文献
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This paper presents a numerical model that simulates the wind fields, turbulence fields, and dispersion of gaseous substances in urban areas on building to city block scales. A Computational Fluid Dynamics(CFD) approach using the steady-state, Reynolds-Averaged Navier-Stokes(RANS) equations with the standard k-ε turbulence model within control volumes of non-uniform cuboid shapes has been employed. Dispersion field is computed by solving an unsteady transport equation of passive scalar. Another approach based on Gaussian plume model is used to correct the turbulent Schmidt number of tracer, in order to improve the dispersion simulation. The experimental data from a wind tunnel under neutral conditions are used to validate the numerical results of velocity, turbulence, and dispersion fields. The numerical results show a reasonable agreement with the wind tunnel data. The deviation of concentration between the simulation with corrected turbulent Schmidt number and the wind tunnel experiments may arise from 1) imperfect point sources, 2) heterogeneous turbulent difusivity, and 3) the constant turbulent Schmidt assumption used in the model. 相似文献
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使用国家气候中心全球海气耦合模式嵌套区域气候模式(RegCM_NCC)对1983 2002年冬季以及1984-2003年春季我国平均气温和降水进行了数值回报试验,并对2003-2007年进行实时预报.结果表明:区域气候模式20年冬、春季平均气温的回报与实况在分布形态上较为相似,我国大部地区平均气温预报与实况接近;模式回报的冬、春季降水量的分布形态与实况有较大差异,全国大部地区模式回报降水量比实况偏多,西南地区降水量误差最大.使用国家气候中心气候预测室的业务预报评分(P)和距平相关系数(ACC)等5个评估参数对模式的回报和预报进行了评估分析,结果表明:该模式对我国冬、春季平均气温和降水具有一定的跨季度预报能力.大多数年份冬,春季平均气温的P评分在60以上,冬、春季平均气温多年平均分别为66.4和67.8;大多数年份的冬、春季降水评分为60~75,冬、春季降水多年平均分别为69.9和65.6. 相似文献
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川康边区之雨量 总被引:1,自引:0,他引:1
本文所论,以四川西部岷江流域及西康东部稚龙江,金沙江与澜沧江上游为限,东起105°E,西至95°E,北自33°N,南止28°N。是区适当四川盆地与西藏高原交接之地带,境内地形至为复杂,高山深谷,东西骈列,走向大致均由北而南,或西北而东南。山在四川西北境有九顶山脉,南尽于成都平原,平均海拔在三千公尺以上,北为雪宝顶,南为九顶山,海拔在五千公尺左右,其西有印崃山,夹金山及大相岭,连绵不断,耸峙于川康边界上,北部拔海约四千公尺,南部则在二千公尺左右,走向初南北而后折为东西,酉康境内,大雪山脉为东部之屏障,平均海拔在四千公尺以上,北名折多山,中为贡噶山,南为 相似文献
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1956年1月到3月上旬亚洲上空大气环流的结构 总被引:1,自引:2,他引:1
根据1956年1月到3月上旬亚洲地区高空资料,对亚洲大陆上空的大气环流进行了探讨。作者得出了下列的事实: 1)在上述时间期限内的平均情况表明,亚洲大陆上空存在着二支急流。这二支急流在东经140°经度上已经汇合。 2)二支急流在东亚部分都表现有向东加速的现象。南支急流自东经75°就开始明显地向东加速。而北支急流的加速自东经100°附近才开始。 3)东亚大陆上大气的斜压性主要是集中在高原的附近。 另外对上述现象也作了一些初步的研究。作者认为西藏高原的存在对大气环流有下列三方面的影响: 1)高原加强了大气的斜压性,并且在高原南方形成垂直环流。因而强烈的加速了南支急流。 2)高原的存在使得南北二支急流在其东侧互相接近,显然地影响了急流的加速。 3)高原保证了南支急流强大而且稳定,这就是说每天每年同季的变化都小。 相似文献
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N. O. Plaude E. A. Stulov N. A. Monakhova M. V. Vychuzhanina E. V. Sosnikova N. P. Grishina 《Russian Meteorology and Hydrology》2007,32(12):743-749
Absract On the data of 13-year (1994–2006) measurements, during January to June, of the atmospheric aerosol characteristics in Dolgoprudny,
Moscow region, effects of the city of Moscow on aerosol contamination of the surface air is analyzed. A relative increase
is estimated of concentrations of particles of various sizes within the diameter range of 0.01 to 10 μm under conditions of
airflow from the city of Moscow, along with changes in concentrations of cloud condensation nuclei and ice nuclei in the air.
It is shown that percentage of the aerosol particles from Moscow in the total aerosol concentration within certain size ranges
reaches 30% in winter months and 45% in summer ones. The aerosol transported from the city contains a significant amount of
hygroscopic particles. The cloud nuclei concentration in June increases by a factor of 2 in the cases of airflow from the
city.
Original Russian Text ? N.O. Plaude, E.A. Stulov, N.A. Monakhova, M.V. Vychuzhanina, E.V. Sosnikova, N.P. Grishina, 2007,
published in Meteorologiya i Gidrologiya, 2007, No. 12, pp. 35–43. 相似文献
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G. Schauberger 《Theoretical and Applied Climatology》1992,46(1):45-51
Summary A model for biologically-effective ultraviolet radiation (UVR) of the sun is described, which allows the calculation of diffuse irradiance on inclined surfaces. A model is presented, for which isotropic scattered and reflected radiance are assumed. Using the horizon as a borderline between the upper and lower hemisphere, the scattering phenomena in the atmosphere for UVR are discussed. In contrast to models for other solar spectral ranges, the radiation field of UVR is close to isotropic. Only the horizon darkening by the long optical pathlengths was included in the model. This term was quantified by the UV albedo.Dedicated to O. Univ.-Prof. Dr. F. Steinhauser.With 1 Figure 相似文献