摘要
本文利用我国西北地区有代表性的3个测站的常规探空资料,应用大气折射理论和统计学方法建立了大气折射指数垂直分布的三种统计模式。计算结果表明:目前使用的4/3地球半径模式精度较差,只能在离地面1 km高度以下使用,才能保证精度;改进等效地球半径模式的精度最高;指数模式在离地面3 km高度以下使用精度也可保证。
In this paper, conventional radiosonde data from three representative observational stations in northwest region of China are used to establish three statistical models for the vertical distribution of the atmospheric refractive index based on the atmospheric refractive theory and the statistical approach. Results show that the current 4/3 effective earth's radius model has the lowest accuracy and can be used only below the height of 1 kilometer over the surface to guarantee sounding accuracy while the modified effective earth's radius model has the greatest accuracy. It is found that accuracy can be guaranteed by using the exponential model when below 3 kilometers over the surface.
出处
《高原气象》
CSCD
北大核心
1993年第1期48-55,共8页
Plateau Meteorology
关键词
大气
折射指数
统计模式
分布
Atmospheric refractive index
Statistical model
Effective earth's radius
Reference atmosphere
Ray tracing.
