近地面1km高度处折射率梯度与地面气象参数统计关系的研究

The statistical relationship between refractivity gradient in the lowest 1 km near the ground and ground meteorological parameters

近地面大气折射率梯度是影响无线电系统性能的重要因素.为研究近地面折射率梯度与地面气象参数温湿压的关系,利用太原地区1986—1995年的探空数据,拟合出近地面折射率梯度与地面气象参数的关系模型.拟合分析结果表明:太原地区近地面1 km高度处折射率梯度与地面气象参数的线性关系优于与地面折射率的指数关系;从与地面气象参数的线性模型中可以直观地看出折射率梯度受地面温湿压影响的权重.通过研究近地面折射率梯度与地面气象参数的统计关系,可更快捷地通过地面温湿压评估近地面无线电视距,从而进一步为大气折射的研究提供支持,为优化无线电系统规划设计提供支撑.

The atmospheric refractivity gradient near the ground is an important factor that affects the performance of radio systems.In order to study the relationship between refractivity gradient and ground meteorological parameters,we used the radiosonde data from 1986 to 1995 in Taiyuan to fit the relationship model between the near-surface refractivity gradient and the ground meteorological parameters.By fitting the sounding data,the results show that the linear relationship between refractivity gradient in the lowest 1 km near the ground and ground parameters is better than the exponential relationship with the ground refractivity in Taiyuan area,and meanwhile,the height of refractivity gradient affected by ground temperature,humidity and pressure can be directly seen from the relationship model of ground meteorological parameters.By studying the statistical relationship between refractivity and ground meteorological parameters,we can evaluate the radio line-of-sight near the ground more quickly through the ground temperature humidity and pressure,and the study in this paper can provide further support for the study of atmospheric refraction and for the optimization of radio system planning and design.