Articles | Volume 23, issue 19
https://doi.org/10.5194/acp-23-12589-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-23-12589-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
10 Oct 2023
Research article |
| 10 Oct 2023
| 10 Oct 2023
Occurrence frequency of subcritical Richardson numbers assessed by global high-resolution radiosonde and ERA5 reanalysis
Jia Shao
College of Informatics, Huazhong Agricultural University, Wuhan 430070, China
Jian Zhang
CORRESPONDING AUTHOR
Hubei Subsurface Multi-scale Imaging Key Laboratory, School of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, China
Wuke Wang
School of Environmental Studies, China University of Geosciences, Wuhan 430074, China
Shaodong Zhang
Electronic Information School, Wuhan University, Wuhan 430072, China
Tao Yu
Hubei Subsurface Multi-scale Imaging Key Laboratory, School of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, China
Wenjun Dong
Center for Space and Atmospheric Research (CSAR), Embry-Riddle Aeronautical University, Daytona Beach, FL, USA
Global Atmospheric Technologies and Sciences (GATS), Boulder, CO, USA
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Zhang, J., Guo, J., Zhang, S., and Shao, J.: Inertia-gravity wave energy and instability drive turbulence: Evidence from a near-global high-resolution radiosonde dataset, Clim. Dynam., 58, 2927–2939, https://doi.org/10.1007/s00382-021-06075-2, 2022b.
Short summary
Kelvin–Helmholtz instability (KHI) is indicated by the critical value of the Richardson (Ri) number, which is usually predicted to be 1/4. Compared to high-resolution radiosondes, the threshold value of Ri could be approximated as 1 rather than 1/4 when using ERA5-based Ri as a proxy for KHI. The occurrence frequency of subcritical Ri exhibits significant seasonal cycles over all climate zones and is closely associated with gravity waves and background flows.
Kelvin–Helmholtz instability (KHI) is indicated by the critical value of the Richardson (Ri)...
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