The differences of meteorological drought of SPEI on the north and south slopes of Tianshan Mountains with different evapotranspiration methods
- Article
- Figures
- Metrics
- Preview PDF
- Reference
- Related
- Cited by
- Materials
Abstract:
The spatial and temporal variations of meteorological drought on the north and south slopes of Tianshan mountains in Xinjiang from 1960 to 2016 were investigated with three sets of standardized precipitation evapotranspiration index (SPEI),based on three different methods to estimate the potential evapotranspiration (PET).They were Penman Monteith method (SPEI-PM),instrument measurement (SPEI-SJ) and Thornthwaite method (SPEI-TH).The results showed:(1) Both the SPEI-SJ and SPEI-PM indexes showed a wetting trend and a decrease of drought area,but the SPEI-TH index showed an opposite trend;(2) The SPEI-SJ and SPEI-PM indexes had the same occurrence frequency of drought on the annual and seasonal scales,i.e.,drought occurred more frequently in the spring and summer seasons,followed by autumn,and the least in winter season.However,the drought frequency of SPEI-TH did not show significant differences in various time scales.The spatial patterns of drought frequency from the SPEI-SJ and SPEI-PM indices were consistent.There was a difference of drought frequency in local regions,which was the same as drought intensity variation;(3) SPEI-PM had a relatively higher accuracy before 1986,while SPEI-SJ only had a higher accuracy after 1990 in comparison with observed drought events.SPEI-TH was the worst index to reflect drought events.Overall,SPEI-PM was the most suitable index for monitoring historical drought events,and SPEI-SJ could add some values for monitoring drought after 1990s.
Keywords:
Project Supported:
Clc Number:
Mobile website
® 2024 All Rights Reserved
冀公网安备13010502002656号
冀公网安备13010502002656号