Selecting a good site for ground-based astronomy is very important. Based on the ERA-Interim global reanalysis data, this paper studied the atmospheric conditions of the Qitai Telescope (QTT) site from the aspects of absolute humidity, mixing ratio and precipitable water vapor (PWV). Error estimations of meteorological parameters are also analyzed. These primary results show that the QTT site has obvious advantages in terms of conditions with much less atmospheric water vapor than two well-known existing sites with 100-meter-aperture radio telescopes in the world. In addition, due to the influence of atmospheric water vapor on radio observations, the atmospheric transmittance for each frequency band of the site are simulated, and the atmospheric opacity is also calculated as well as Planck radiation brightness. Based on these results, the effective observational time of different bands is further estimated.

为地面天文学选择一个好的地点是非常重要的。本文基于ERA-Interim全球再分析数据，从绝对湿度、混合比和可降水水汽（PWV）等方面研究了奇台望远镜（QTT）站点的大气条件。还分析了气象参数的误差估计。这些初步结果表明，QTT站点在大气水汽条件方面比世界上两个拥有100米口径射电望远镜的知名站点具有明显的优势。此外，由于大气水汽对射电观测的影响，模拟了场地各频段的大气透过率，还计算了大气不透明度以及普朗克辐射亮度。基于这些结果，