REN Pei-gui, ZHANG Bo, ZHANG Tiao-feng, et al. Trend Analysis of Meteorological Drought Change in Northwest China Based on Standardized Precipitation Evapotranspiration Index[J]. Bulletin of Soiland Water Conservation, 2014, 33(1): 182-187.
DOI:
REN Pei-gui, ZHANG Bo, ZHANG Tiao-feng, et al. Trend Analysis of Meteorological Drought Change in Northwest China Based on Standardized Precipitation Evapotranspiration Index[J]. Bulletin of Soiland Water Conservation, 2014, 33(1): 182-187. DOI: 10.13961/j.cnki.stbctb.2014.01.010.
Trend Analysis of Meteorological Drought Change in Northwest China Based on Standardized Precipitation Evapotranspiration Index
which is one of the driest regions as compared with the areas in the same latitude. If drought persists
it will have a severe impact on social and economic development of the northwest region. Therefore
study of drought characteristics in Northwest China is of great significance to the eco-environment improvement and the promotion of economic development in the region. Standardized precipitation evapotranspiration index(SPEI) combining the influence of temperature on evapotranspiration is a new ideal indicator in the research on drought under the background of global warming. The data from 149 representative meteorological stations in Northwest China in 1959-2011 were used to analyze the temporal and spatial variation of drought. Results showed that drought was a universally existed fact in the northwest. From the inter-annual perspective
the region showed a drought trend with an abrupt change in 1996. Form the seasonal changes
the weather became drought in spring
summer and autumn
and had a humid tend in winter
which is not obvious. Worsening trend occurred in spring
summer and autumn
but was not obvious in winter. Spatially
most regions had a drought trend in spring and summer and a humid tend in winter. Compared with almanac data
SPEI
as a drought index
is confirmed to be applicable in Northwest China.
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references
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