标题： 青藏高原东缘大气边界层高度的变化 显示英文标题

标题： Variation of the Atmospheric Boundary Layer Height at the Eastern Edge of the Tibetan Plateau

摘要： 本文利用了2021年2月至5月和8月至11月期间位于青藏高原东坡的大型高山空气簇射观测站（LHAASO）上的多通道微波辐射计观测到的高时间和空间分辨率温度廓线数据，并结合2021年全年ERA5再分析数据产品，研究了大气边界层高度（ABLH）的日、月和季节变化。结果如下：（1）晴天的ABLH表现出明显的波动，有峰有谷。日出后随着地表温度的升高，ABLH持续上升，通常在下午约18:00达到最大值，然后迅速下降直至日落。（2）4月份的平均ABLH最高，约为1200米，而11月份仅为约600米。白天ABLH波动较大，夜间则稳定在约400米。ERA5获得的ABLH结果整体上略小，但与微波辐射计的变化趋势一致。（3）春季的ABLH最大，其次是夏季和秋季，冬季值最低，所有峰值均出现在14:00-15:00左右。这些结果对于理解青藏高原东坡的ABLH具有重要意义，并为LHAASO望远镜光子数的绝对校准、大气监测计划以及评估现有再分析数据集的真实性与准确性提供了参考。 显示英文摘要

摘要： This paper utilized the high temporal and spatial resolution temperature profile data observed by the multi-channel microwave radiometer at the Large High Altitude Air Shower Observatory (LHAASO) on the eastern slope of the Tibetan Plateau from February to May and August to November 2021, combined with the ERA5 reanalysis data products for the whole year of 2021, to study the daily, monthly, and seasonal variations of the atmospheric boundary layer height (ABLH). The results are as follows: (1) The ABLH on sunny days showed obvious fluctuations with peaks and valleys. The ABLH continued to rise with the increase of surface temperature after sunrise and usually reached its maximum value in the afternoon around 18:00, then rapidly decreased until sunset. (2) The average ABLH in April was the highest at about 1200 m, while it was only around 600 m in November. The ABLH fluctuated greatly during the day and was stable at around 400 m at night. The ABLH results obtained from ERA5 were slightly smaller overall but had a consistent trend of change with the microwave radiometer. (3) The maximum ABLH appeared in spring, followed by summer and autumn, and winter had the lowest value, with all peaks reached around 14:00-15:00. These results are of great significance for understanding the ABLH on the eastern slope of the Tibetan Plateau, and provide reference for the absolute calibration of photon numbers of the LHAASO telescope and the atmospheric monitoring plan, as well as for evaluating the authenticity and accuracy of existing reanalysis datasets.