Funding for this research was provided by:
the NSFC key program (41630426)
The Innovation Team of Gansu Meteorological Bureau (GXQXCXTD-2020-02)
he Natural Science Foundation of Gansu Province (20JR5RA119)
Article History
Received: 12 May 2020
Accepted: 4 January 2021
First Online: 21 January 2021
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.