EGU21-5391
https://doi.org/10.5194/egusphere-egu21-5391
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Long-term variation of characteristics of local land atmosphere coupling over TP and the possible influence of Southern Asian Monsoon

Genhou Sun1,2, Zeyong Hu3, yaoming Ma4, Zhipeng Xie4, Wei Wei1,2, and Song Yang1,2
Genhou Sun et al.
  • 1School of Atmospheric Sciences and Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Sun Yat-sen University, Guangzhou, China(sungh6@mail.sysu.edu.cn)
  • 2Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai)
  • 3Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences
  • 4Institute of Tibetan Plateau Research, Chinese Academy of Sciences

This study investigates the long-term variations of local land atmosphere coupling (LoCo) over Tibetan Plateau (TP) by applying a mixing diagram to the observational data at six stations over TP and ERA5 and the possible influence of Southern Asian monsoon. The result indicates that the monthly-mean daily variation in T2m, q2m, Hsfc, and LEsfc at Nyingchi, Nagqu, Nam Co, Qomolangma, Ngari, and Muztagata in ERA5 are close to those in observational data. Comparison of mixing diagram analysis using the monthly-mean variables of ERA5 and the observational data indicates ERA5 could provide reliable information of LoCo at six stations. The relationships between Hsfc and daytime PBLH, and the variations of LCL deficit at six stations are different due to the differences in the soil states. The long-term variations in the PBL energy budgets, mean daytime PBLH, and LCL deficits at 31N and 90E show clear annual variations and have a close relationship between Southern Asian monsoon. The possible influence of the Southern Asian monsoon is also discussed in terms of the relationship between the Webster-Yang index and the PBL energy budgets, mean PBLH and mean LCL over TP.

How to cite: Sun, G., Hu, Z., Ma, Y., Xie, Z., Wei, W., and Yang, S.: Long-term variation of characteristics of local land atmosphere coupling over TP and the possible influence of Southern Asian Monsoon, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-5391, https://doi.org/10.5194/egusphere-egu21-5391, 2021.

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