基于Polar WRF模拟结果估算南极泰山站近地面大气折射率结构常数

ESTIMATING NEAR-SURFACE ATMOSPHERIC REFRACTIVE INDEX STRUCTURE CONSTANTS AT ANTARCTIC TAISHAN STATION USING SIMULATED PARAMETERS FROM POLAR WRF

天文台址的选择与近地面的光学湍流强度密切相关,南极与中低纬度相比,具有极低的天空背景辐射、极低的气溶胶浓度和非常小的光污染,吸引了世界多国在此建立天文观测站。采用专门用于极地研究的极地数值天气预报模式(Polar WRF)来模拟得到南极泰山站的常规气象参数,对于温度和风速大小,模拟值与观测值的相关系数分别高达0.95和0.89。由模拟得到的常规气象参数根据Monin-Obukhov相似理论估算折射率结构常数(C_n^2),并与位于泰山站处移动式极地大气参数测量系统的观测结果做了对比,结果表明模拟值与观测值变化趋势基本一致,相关系数达0.67。

Optical turbulence intensity in the near-surface layer is closely related to the quality of potential astronomical observatory sites. Compared with the middle and low latitudes, Antarctica has very low background radiation, aerosol concentration and light pollution, and is an attractive location for the establishment of astronomical observatories. Conventional meteorological parameters at Antarctic Taishan Station were simulated using the Polar Weather Research and Forecasting model(Polar WRF), which has been developed specifically for polar research. Correlation coefficient between simulated and measured temperature was up to 0.95 and that between simulated and measured wind speed was up to 0.89. Refractive index structure constant(Cn^2) was estimated from the simulated meteorological parameters using the Monin–Obukhov similarity theory, and compared with values derived from measurements from the mobile polar atmospheric parameter measurement system at Taishan Station. There is high consistency between simulated and measured values. Correlation coefficient between simulated and measured values is 0.67.