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青藏高原东坡大气边界层高度变化观测研究

Variation of the Atmospheric Boundary Layer Height at the Eastern Edge of the Qinghai-Tibet Plateau

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利用2021年2-5月和8-11月青藏高原东坡高海拔宇宙线观测站(Large High Altitude Air Shower Observatory,LHAASO)多通道微波辐射计观测的高时空分辨率温度廓线数据,并结合 2021年ERA5再分析资料,分析大气边界层高度(Atmospheric Boundary Layer Height,ABLH)的日、月和季平均日变化规律.结果表明:(1)晴朗天气的ABLH具有明显的波峰波谷变化,日出后地表温度升高,ABLH也随之持续升高,最大值通常出现在午后,至 18时左右迅速降低,日落之后降至最低.(2)一年之中,4月平均ABLH最大,约为1200 m,11月只有600 m.ABLH白天波动大,夜晚稳定,平均降至400 m左右.基于ERA5 再分析资料反演的ABLH整体结果偏小,但具有与微波辐射计一致的变化趋势.(3)ABLH最大值出现在春季,夏季和秋季次之,冬季最小,且均在14:00-15:00达到峰值.
By using the high temporal resolution temperature profile data with multi-channel microwave radiometer over the Large High Altitude Air Shower Observatory(LHAASO)from February to May and August to November 2021,combined with the ERA5 reana-lysis data in 2021,the Atmospheric Boundary Layer Height(ABLH)with the potential temperature gradient method was calculated and the diurnal,monthly,and seasonal variation characteristics of ABLH were studied.The following findings were obtained:(1)The ABLH showed significant diurnal variation under clear weather conditions.Due to an increase in land surface temperature after sunrise,the ABLH continued to increase,and the maximum height usually appeared in the afternoon,decreased rapidly to the minimum after sunset.(2)Within one year,the average ABLH was the highest in April,about 1200 m,and the lowest in November,only 600 m.The ABLH fluc-tuated greatly during the daytime and remained stable at night,with an average height of approximately 400 m.The overall result of ABLH inverted by ERA5 was small,but it had the same trend as those from the microwave radiometer.(3)The maximum value of ABLH appeared in spring,followed by summer and autumn,and the minimum in winter.In all seasons,the atmospheric boundary layer height peaked at 14:00 to 15:00.

Atmospheric boundary layer heightMicrowave radio meterERA5 reanalysis dataDiurnal variationMonthly variationSeasonal variation

柳靖、唐晓凡、夏君集、祝凤荣

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西南交通大学物理科学与技术学院,成都 611756

西藏大学理学院,拉萨 850000

大气边界层高度 微波辐射计 ERA5再分析资料 日变化 月变化 季节变化

国家重点研发计划四川省科技厅省院省校重点项目四川省科技厅省院省校重点项目

2021YFA07184032021YFSY00302021YFSY0031

2024

10.3969/j.issn.1674-2184.2024.02.004

高原山地气象研究
中国气象局成都高原气象研究所 中国气象学会高原气象学委员会

高原山地气象研究

CSTPCD
影响因子：1.313
ISSN：1674-2184
年,卷(期)：2024.44(2)
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