1,7月东亚大陆低空高低压的天气气候学分析     

许宝玉  罗四维 《高原气象》1993,12(1):56-66

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氮氧化物(NOX)在对流层中的收支与循环的研究   总被引：2，自引：0，他引：2  

罗超  周秀骥 《应用气象学报》1993,4(1):92-99

对氮氧化物（NOx）在对流层中的收支与循环问题，及其在对流层中的各种源汇过程进行了综述与讨论。其中包括NOx的人为排放与自然排放，干、湿沉降的清除及其相对重要性等。并对我国NOx的人为排放与自然排放进行了估算。  相似文献   

STUDY OF THE RANDOMNESS INHERENT IN THE TYPHOON MOVEMENT^*          下载免费PDF全文

Luo Zhexian  Ma Jingxian 《Acta Meteorologica Sinica》1993,7(2):153-161

A difference scheme is adopted to perform numerical integrations of a deterministic barotropic vorticity equation for four designed experiments,and the 1-D and 2-D sequences are obtained for the velocity of the typhoon center with the aid of model output,together with the correlation dimension and K entropy investigated.Results show that there exists randomness inherent in the center movement in the model atmosphere.Eventually the influence of localized heat sources and basic flow upon the stochasticity and predictability of the track of typhoon is discussed.  相似文献   

一个新的铋亚碲酸盐矿物—平谷矿   总被引：1，自引：0，他引：1  

孙志富  雒克定 《矿物学报》1994,14(4):315-321

平谷矿是在北京市平谷县一小型金矿氧化带中发现的一种新矿物。共生和伴生矿物有褐铁矿、孔雀石、磷氯铝矿、泡铋矿、自然金、银金矿、石英、方解石和白钨矿。通常呈粒状集合体出现，单体板柱状，极为细小（0．3～0．6μm），黄绿色，玻璃至金刚光泽。实测密度＝8．44g／cm3，计算密度8．64g／cm3。维氏硬度449～572kg／mm2，相当摩氏硬度5～6。反射率＝13．25％，折射率＞2．0，计算折射率为2．145，电子探针分析结果Bi2O379．56％、TeO220．17％，总和99．73wt％，化学式Bi5。8043Te2。1475O13理想式Bi6Te2O13。X射线粉晶分析主要强线3．146（100）（12）、2．841（80）（200）、2．694（20）（040）、1．695（20）（321）、1．956（10）（240）、1．631（10）（16），斜方品系，a＝0．5689（1），b＝1．0791、c＝0．5308（1）um，晶胞体积V＝0．3258um3，Z＝1。  相似文献   

PRELIMINARY STUDY OF VARIATION OF SO_2 AND AEROSOL PARTICLE BACKGROUND CONCENTRATIONS IN THE EASTERN CHINA          下载免费PDF全文

罗超  丁国安  杨东贞  汤杰  周秀骥 《Acta Meteorologica Sinica》1994,(3)

The average concentrations of sulphur dioxide,sulfate aerosol and TSP were about 8—10 ppb,15.08 μg m~(-3),and241.40 μg m~(-3) respectively,which were measured at the Lin'an regional background station during August—November,1991.The higher concentrations of SO_2 and SO_4~(2-) maybe acidify the rainfall.It has a great influence uponthe human health and ecosystem.The simulated results indicate that the distributions of SO_2 and SO_4~(2-) were deter-mined by local emission sources.Average aerosol particle number density was 2.0×10~4 cm~(-3).It shows that social devel-opment and human activities strongly affect the atmospheric background level.  相似文献   

A REGIONAL MODEL STUDY OF THE VARIATIONS AND DISTRIBUTIONS OF OZONE AND ITS PRECURSORS ON EASTERN ASIA AND WEST PACIFIC OCEAN REGIONS          下载免费PDF全文

罗超)  周秀骥) 《Acta Meteorologica Sinica》1994,(2)

A simulated study of mechanism for variations and distributions of ozone and its precursors was made by using thethree-dimensional regional Eulerian model.The results showed that the ozone production was controlled by NO,butthere is a complicated nonlinear relation between them.The photochemical reactions controlled by solar radiation arethe determinative factors affecting the variations of the surface ozone and its precursors.The relations of ozone and CO,PAN were studied.We compared the simulated and observed results during the PEM-WEST A in order to better under-stand the photochemical processes of ozone and its precursors.  相似文献   

A STUDY ON PHYSICAL MECHANISM OF INTERANNUAL VARIATIONS OF LARGE-SCALE FLOW PATTERNS^*          下载免费PDF全文

Luo Zhexian 《Acta Meteorologica Sinica》1994,8(4):410-418

The thermal forcings of annual and interannual periodic variations are introduced into the barotropic vorticity equation,by using low order spectral model of the equation,more than 40 numerical experiments whose integration time is larger than 100 model years are performed in order to investigate variations of large-scale flow patterns arising from both external interannual thermal forcing and internal dynamical processes.In certain parametric range,when the frequency of the forcing term with interannual period equals to the frequency which is created by the internal dynamical processes alone,the amplitude of interannual variations of flow patterns increases obviously,and the period becomes double.In other parametric range,the amplitude of interannual variations of flow patterns shows abrupt changes and other nonlinear behavior,along with gradual changes of interannual forcing parameters.  相似文献   

Study of Effects of Beta Term and Nonlinear Advection on the Structure of Tropical Cyclones     

Luo Zhexian 《大气科学进展》1994,11(4):391-398

The effects of the Beta term on the typhoon structure are examined within the linear framework in terms of an analytical method of 2-D Fourier representation and numerical experiments by a Beta-plane quasi-geostrophic barotropic model. Results show that the joint effects of the difference of Rossby phase velocities and the dispersion of typhoon energy keep the maximum wind velocity reasonably evolving rather than irrestrictively increasing. On the one hand, the nonlinear advection accelerates typhoon vortex damping, and on the other, the high pressure system formed downstream due to energy dispersion makes it easy to maintain.  相似文献   

模糊数学在地下水环境质量评价中的应用   总被引：2，自引：0，他引：2  

罗定贵  徐辉 《华东地质学院学报》1994,17(4):350-355

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轻度超固结土的一维现场固结     

罗嗣海 《华东地质学院学报》1994,17(4):365-372,378

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