Effect of the boundary layer low-level jet on  fast fog spatial propagation

Yan, Shuqi; Wang, Hongbin; Liu, Xiaohui; Zu, Fan; Liu, Duanyang

doi:https://doi.org/10.5194/acp-23-13987-2023

Articles | Volume 23, issue 21

https://doi.org/10.5194/acp-23-13987-2023

© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-23-13987-2023

© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 23, issue 21

Research article

|

09 Nov 2023

Research article |

| 09 Nov 2023

Effect of the boundary layer low-level jet on fast fog spatial propagation

Shuqi Yan, Hongbin Wang, Xiaohui Liu, Fan Zu, and Duanyang Liu

Data sets

ERA5 hourly data on pres-sure levels from 1940 to present H. Hersbach, B. Bell, P. Berrisford, G. Biavati, A. Horányi, J. Muñoz Sabater, J. Nicolas, C. Peubey, R. Radu, I. Rozum, D. Schepers, A. Simmons, C. Soci, D. Dee, and J.-N. Thépaut https://doi.org/10.24381/cds.bd0915c6

National Ground Meteorology Observation Data China Meteorological Data Service Centre http://www.nmic.cn/dataService/cdcindex/datacode/A.0012.0001/show_value/normal.html

An Introduction to Himawari-8/9 – Japan's New-Generation Geostationary Meteorological Satellites (https://www.eorc.jaxa.jp/ptree/) K. Bessho, K. Date, H. Masahiro, A. Ikeda, T. Imai, H. Inoue, Y. Kumagai, T. Miyakawa, H. Murata, T. Ohno, A. Okuyama, R. Oyama, Y. Sasaki, Y. Shimazu, K. Shimoji, Y. Sumida, M. Suzuki, H. Taniguchi, H. Tsuchiyama, D. Uesawa, H. Yokota, and R. Yoshida https://doi.org/10.2151/jmsj.2016-009

Model code and software

A description of the advanced research WRF Version 3 (NCAR Technical Note NCAR/TN-475+STR) W. C. Skamarock, J. B. Klemp, J. Dudhia, D. O. Gill, D. M. Barker, M. G. Duda, X. Huang, W. Wang, and J. G. Powers https://www2.mmm.ucar.edu/wrf/users/download/get_source.html

Short summary

In this study, we quantitatively study the effect of the boundary layer low-level jet (BLLJ) on fast fog spatial propagation; i.e., the fog area expands very fast along a certain direction. The wind speed (10 m s⁻¹) and direction (southeast) of the BLLJ core are consistent with fog propagation (9.6 m s⁻¹). The BLLJ-induced temperature and moisture advections are possible reasons for fast fog propagation. The propagation speed would decrease by 6.4 m s⁻¹ if these advections were turned off.