Spatiotemporal Characteristics and Impacts Analysis of Drought in China based on PDSI
Abstract
Drought is considered as a phenomenon with an imbalance of moisture content payments. As the result of climate change with more prolonged precipitation deficit and abnormal high evaporation, it is expected to increase in frequency and severity. However, the research based on Palmer Drought Severity Index (PDSI, J. Sheffield) calculated by the Penman-Monteith equation showed that the increase in global area was overestimated, as drought is affected by humidity, wind speed, radiation and other surface conditions. Here we show that drought in China experienced a slight increase during the past 65 years as the result of PDSI data sets. The trend in annual average PDSI in 1948-2012 is -0.0055 yr-1 (not significant). For more recent over 1982-2012, the trend is -0.0295 yr-1 (not significant). Furthermore, regions with diverse terrain, climate type lead to the different spatial pattern of PDSI trend. The PDSI in 28% area of China, mainly in Xinjiang and Tibetan Plateau increased during the period 1948-2012, while the 48% area experienced a decrease, these regions become little drier mainly are the northern margin of the Tibetan Plateau, central Inner Mongolia and most area of northeast China. In the recent period, the PDSI increased in 24% area and more regions (52%) in the western of Tibetan Plateau and most area of eastern China decreased. As drought increase in China during the 1982-2012, the GIMMS NDVI shows vegetation activity decreased (not significant) either. However, in only 32% area of China NDVI was positively related with PDSI. Other regions (41% area of china) had negative relationship mainly are Tibetan Plateau, northwest China and northeast China, where vegetation cover might increase in the drought period.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2016
- Bibcode:
- 2016AGUFM.H21G1503H
- Keywords:
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- 1807 Climate impacts;
- HYDROLOGYDE: 1812 Drought;
- HYDROLOGYDE: 1817 Extreme events;
- HYDROLOGYDE: 1833 Hydroclimatology;
- HYDROLOGY