【摘 要】
：
On the basis of introducing the basic categories of atmospheric refraction and their existing conditions, the forming processes of three kinds of atmospheric du
【机 构】
：
Beijing Institute of Applied Meteorology,Department of Geophysics
论文部分内容阅读
On the basis of introducing the basic categories of atmospheric refraction and their existing conditions, the forming processes of three kinds of atmospheric duets are expounded. Several main characteristics of atmospheric duct are summarized and analyzed, and field sounding data from the WEstern North-Pacific cloud-radiation EXperiment (WENPEX) and meteorological data around the Xisha sea area are used to validate these characteristics. Meanwhile the sensitivities of the evaporation duct height to the variations of atmospheric humidity, the air-sea temperature difference, and horizontal wind speed are examined. With the analysis of the effect of atmospheric duct on the propagation of electromagnetic wave, the maximum trapped-wavelength and the critical emitting angle of elevation for electromagnetic wave which can form duct propagation are derived.At the same time the four kinds of necessary conditions for electromagnetic wave to form duct propagation are brought forward. The effects of atmospheric duct on ultrashort wave propagation,radar observation, short wave communication etc. are also discussed.
其他文献
The Mesoproterozoic mafic dyke swarms are extensively distributedin the central North China Craton(NCC) including North Shanxi, Wutai and Lüliang areas, which
The Along-Track Scanning Radiometer (ATSR) onboard the EuropeanRemote Sensing satellite (ERS) is presently the only one available to provide quasi-simultaneous
A one-dimensional mathematical model for unsteady sediment transport in the Lower Yellow River is developed. A coefficient of sediment distribution is defined t
The seasonal variations of convective activities over the South China Sea (SCS) and its neighborhood, as well as the similarities and differences of convection
Compared to North American shale composition (NASC), REE contents of sediments from the CC area in the Pacific Ocean are obviously high except that cerium has e
In order to evaluate the validity of commonly used formulae describing erosion and deposition of cohesive sediments for their application within numerical simul
This paper is concentrated on Cenozoic volcanism and geothermal resources in Northeast China. There are a lot of Cenozoic volcanoes, a large area of volcanic ro
The theory and simulation of fully-nonlinear waves in a truncated two-dimensional wave tank in time domain are presented. A piston-type wave-maker is used to ge
语文课程是中专院校各专业学生的主要文化基础课,它是学好其他学科的基础.但是目前我国中专生的语文学习现状令人担忧,提高中专生的读写能力迫在眉睫.本文根据调查,首先介绍
A comprehensive study on geothermal history of the Turpan-HamiBasin by vitrinite reflectance, fluid inclusion geothermometry, apatite fission track and 40Ar-39A