慕士塔格站址选址测试 V：近五年夜间云量
Site-testing at the Muztagh-ata Site.V. Nighttime Cloud Amount during the Last Five Years
AI总结：
该研究基于2017-2021年慕士塔格站址的全天相机数据，统计夜间云量与观测时长，得出年可观测时间占比65%等结论，并对比CLARA数据集分析差异原因，为该台站的天文观测规划提供支撑。
摘要：
夜间晴朗度是光学/红外天文观测台站选址工作中需重点考量的核心因素，云量直接关系到台站可用于科学观测的时长。本文报道了2017年至2021年期间，利用地面全天相机在慕士塔格站址获得的详细夜间云量统计及连续观测时长的研究结果。观测数据显示，慕士塔格站址的年可观测时间占比为65%，云量最少且连续观测时间更长的最佳时段为9月至次年2月。我们将全天相机测得的月均可观测夜数与CLARA数据集的结果进行了对比，发现二者的差异可能与云顶高度有关。平均而言，该站址每年可提供175个晴夜，以及169个连续观测时长不少于4小时的夜晚。
英文摘要：
The clarity of nights is the major factor that should be carefully considered for optical/infrared astronomical observatories in site-testing campaigns. Cloud coverage is directly related to the amount of time available for scientific observations at observatories. In this article, we report on the results of detailed night-time cloud statistics and continuous observing me derived from ground-based all-sky cameras at the Muztagh-ata site from 2017 to 2021. Results obtained from acquisition data show that the proportion of the annual observing me at the Muztagh-ata site is 65%, and the best period with the least cloud coverage and longer continuous observing time is from September to February. We made a comparison of the monthly mean observing nights obtained from our all-sky cameras and CLARA dataset, results show that the discrepancy between them may depend on the cloud top heights. On average, this site can provide 175 clear nights and 169 nights with at least 4 hours of continuous observing time per year.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
