Wang, Xiaoyun
Zhuo, La
Li, Chong
Engel, Bernard A
Sun, Shikun
Wang, Yubao
Funding for this research was provided by:
the Science and Technology Integrated Innovation Project, Shaanxi Province of China (2016TZC-N-14-1)
the National Natural Science Foundation of China (41871207)
Article History
Received: 15 April 2019
Accepted: 15 October 2019
First Online: 14 November 2019
Change Date: 18 December 2019
Change Type: Correction
Change Details: The presentation of Fig. 3 was incorrect. The ordinates of Fig. 3b and Fig. 3c should be 12-SPEI and 12-SPI. The descriptions below the picture should also be 12-SPEI and 12-SPI (3-SPEI and 3-SPI should be deleted).