Preprints
https://doi.org/10.5194/acp-2022-257
https://doi.org/10.5194/acp-2022-257
 
10 May 2022
10 May 2022
Status: a revised version of this preprint is currently under review for the journal ACP.

Measurement report: Structure of the atmospheric boundary layer and its relationship with the land-atmosphere interaction on the Tibetan Plateau

Maoshan Li1, Wei Fu2, Na Chang1, Ming Gong1, Pei Xu1, Yaoming Ma3, Zeyong Hu4, Yaoxian Yang4, and Fanglin Sun4 Maoshan Li et al.
  • 1School of Atmospheric Sciences/Plateau Atmosphere and Environment Key Laboratory of Sichuan Province/Joint Laboratory of Climate and Environment Change, Chengdu University of Information Technology, Chengdu 610225, Sichuan China
  • 2Yaan Meteorological Observatory, Sichuan Meteorological Bureau, 625000, Yaan, China
  • 3Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing, China
  • 4Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions, Chinese Academy of Sciences. Lanzhou, China

Abstract. There is a deep atmospheric boundary layer on the Tibetan Plateau (TP) that has always been of interest to researchers. The variation in the atmospheric boundary layer under the influence of the southern branch of the westerly wind and that of the Asian monsoon was analyzed using sounding data collected in 2014 and 2019. Then, the hourly high-resolution comprehensive observation data for the land-atmosphere interaction on the TP and the ERA5 reanalysis data were used to study the influence of the atmospheric boundary layer’s structure in Mount Everest, Nyingchi, Nam Co, Nagqu, and Shiquan River regions. The results show that the height of the convective boundary layer observed at the Mount Everest, Nyingchi, Nam Co, Nagqu, and Shiquan River stations on the TP under the influence of the southern branch of the westerly wind was higher than that during the Asian monsoon season. The height of the convective boundary layer in the Shiquan River area was often highest at 20:00. The structure of the boundary layer in the Mount Everest area was often affected by the westerly jets and glacial winds. The inversion layer developed earlier in the Nyingchi area than at the other stations. The height of the boundary layer was positively correlated with the sensible heat flux and negatively correlated with the latent heat flux. The vertical velocity in the atmospheric boundary layer in the Nyingchi area decreased, which may be one of the reasons why the height of the convective boundary layer was lower in this area than at the other stations and humidity inversion often occurred in this area.

Maoshan Li et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-257', Anonymous Referee #1, 01 Jun 2022
  • RC2: 'Comment on acp-2022-257', Anonymous Referee #2, 12 Jun 2022

Maoshan Li et al.

Data sets

Radiosonde observation data of stations on the Tibetan Plateau in 2014 Li, M. https://data.tpdc.ac.cn/zh-hans/data/70edaec5-8418-44cd-afc4-fb089f7bf413/

A long-term dataset of integrated land-atmosphere interaction observations on the Tibetan Plateau (2005-2016) Ma, Y. https://doi.org/10.11888/Meteoro.tpdc.270910

Maoshan Li et al.

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Short summary
Compared with the plain area, the land-atmosphere interaction on the Tibetan Plateau (TP) is intense and complex, which affects the structure of the boundary layer. The observed height of the convective boundary layer on the TP under the influence of the southern branch of the westerly wind was higher than that during the Asian monsoon season. The height of the boundary layer was positively correlated with the sensible heat flux and negatively correlated with latent heat flux.
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