The Vertical Transport of Air Pollutants by Convective Clouds. Part I: A Non-Reactive Cloud Transport Model   总被引：1，自引：0，他引：1  

Kong Fanyou  Qin Yu 《大气科学进展》1993,10(4):415-427

A convective cloud transport model, without chemical processes, is developed by joining a set of concentration conservative equations into a two-dimensional, slab-symmetric and fully elastic numerical cloud model, and a numerical experiment is completed to simulate the vertical transport of ground-borne, inert gaseous pollutant by deepthunderstorm. The simulation shows that deep convective storm can very effectively transport high concentrated pollutant gas from PBL upward to the upper troposphere in 30 to 40 minutes, where the pollutant spreads laterally outward with strong anvil outflow, forming an extensive high concentration area. Meanwhile, relatively low concentration areas are formed in PBL both below and beside the cloud, mainly caused by dynamic pumping effect and sub-cloud downdraft flow. About 80% of the pollutant gas transported to the upper troposphere is from the layer below 1.5 km AGL (above ground level).  相似文献   

冕宁县地震经济损失预测及社会经济影响分析     

张家涛  孙林松  蒋能强  秦启沛  杨建生 《高原地震》1993,(2)

本文根据冕宁县的社会经济调查资料和建筑物群体震害预测结果,对未来地震引起的经济损失进行了预测,并对地震后可能引起的社会经济影响作了初步分析。  相似文献   

水震波异常与中期强震危险性关系初探   总被引：3，自引：0，他引：3  

鱼金子  车用太 《地震》1993,(4):30-37

近年来在我国井网中发现某些强震之前井水位记震特性的异常现象。本文根据理论分析、试验研究与井网中统计结果提出水震波异常与区域应力状态的变化之间可能存在着一定关系,然后广泛收集了华北地区15口井水位1985—1991年间的水震波资料并系统分析了1989年10月19日大同—阳高M_s6.1地震前后井水位记震特性的变化,确认强震前存在着水震波异常。  相似文献   

The characteristics of surface deformation grouping of the active strike slip fault system and earthquake activity in western Guangxi, China     

Jian-Jun Hou  Xi-Da Liu  Xiang-Zhao You  Huo-Bao Qin 《地震学报(英文版)》1993,6(2):549-553

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场,源前兆的判别—λ型在地震预报中的应用前景     

泰保燕  郭增建 《内陆地震》1993,7(4):300-318

面对复杂的前兆场,进行场、源区分,确定未来大震位置,一直是地震预报中的难点之一。文献[1]首先提出统计物理学中描述系统演化的序参量的整个历程图λ型与大震由孕震、发震和震后的前兆后效过程曲线相类似。λ型的尖锋处相应于临界点或大震发生,尖锋前为对数曲线,尖锋后为急剧下降。根据模拟实验大震震例,进一步研究了λ型与震中距的关系,证明了λ型只有在源区和近源区出现,源外区和远源区λ型将发生畸变,因而提出了λ型和非λ型是判断源、场区前兆的重要指标。最后对λ型产生的物理机制进行了初步讨论。  相似文献   

THE MEANDER OF KUROSHIO AND OSCILLATION IN A COUPLED OCEAN-ATMOSPHERE MODEL^*          下载免费PDF全文

Liu Qinyu  Xu Qichun  Wang Zhilian  Qin Zenghao 《Acta Meteorologica Sinica》1993,7(3):338-346

A numerical experiment of an asynchronous coupled ocean-atmosphere model has been described in this paper.A two-layer global atmosphere general circulation model(OSU/IAP-AGCM)and a two-layer North Pacific Ocean general circulation model(NPOGCM) developed by Liu et al.(1992)are used in numerical experiment.The sea surface temperature anomaly(SSTA) corresponding to the meander of the Kuroshio is treated as the initial perturbation in the Pacific Ocean and the abnormal phenomena caused by the disturbance and the interaction between atmosphere and ocean,have been studied.The numerical experiment showed that the SST anomaly in the North Pacific could induce a new 30-60 day osciltation through the coupling between atmosphere and ocean and the interaction between the meander of the Kuroshio and atmosphere circulation is a positive feedback process.  相似文献   

基质镜质体的煤化作用微环境及其差异演化   总被引：1，自引：0，他引：1  

秦勇  李淑琴等 《煤田地质与勘探》1994,22(2):24-29

在同一样品中，处于硫化铁颗粒外围和硫化铁结核内部的基质镜质体（以下简称基镜体）具不同反射率及地化特征，表明煤层内部煤化作用微环境条件有别导致同类显微组分差异演化，这可能与微应力场和无机元素催化作用不同有关。  相似文献   

青海湖全新世稳定暖湿期的古水量平衡估算   总被引：3，自引：0，他引：3       下载免费PDF全文

秦伯强 《水科学进展》1994,5(1):26-27

各种地貌学、沉积学等证据揭示了青海湖流域在全新世大暖期是一个温暖湿润的环境,特别是距今6000～7200a.B.P.的稳定暖湿期,湖水位远高于现代.利用内陆湖泊的水热平衡原理,构造了青海湖古水量平衡计算模型.计算结果表明,在全新世稳定暖湿期,流域内的降水量、蒸发量及径流量分别比现代高32.0%、14.0%及67.0%.  相似文献   

Correlation of spectroscopic properties and substitutional sites of Cr3+ in aluminosilicates: I. Kyanite     

Y. Y. Yeung  J. Qin  Y. M. Chang  C. Rudowicz 《Physics and Chemistry of Minerals》1994,21(8):526-531

Using the superposition model in conjunction with our crystal field analysis package recently developed for 3d ions doped at arbitrary low symmetry sites in crystals, the energy levels and statevectors have been predicted within the whole 3d ³ configuration of Cr³⁺ at the four possible triclinic sites in kyanite (Al₂O₃∶SiO₂). The values of the ground state zero-field splitting for each of the four Al sites are evaluated. The splittings of the lower excited state ² E as well as the admixture of ⁴ T ₂ state into ² E have also been determined. The predicted results are compared with the available experimental data on the four possible, but so far not uniquely identified, substitutional Cr³⁺ sites in kyanite thus enabling correlation of the spectroscopic properties and substitutional sites.  相似文献   

论三角测量单位权方差的先验估计与后验估计     

覃辉 《四川测绘》1994,(1)

三角洲量单位权方差的先验估值一般用经典菲列罗公式计算。实践中，经常出现三角测量单位权方差的先验估值不等于后验估值的情形．本文根据条件平差的原理，证明了单位权方基的先验估值是有偏估计，经典菲列罗公式是后验估计公式的特殊形式，并推导出了广义菲列罗公式。  相似文献