DocumentCode :
2606213
Title :
The relationship between spatial extent and duration of severe droughts in China over the last 50 years
Author :
Zhang, Da-Quan ; Feng, Guo-Lin
Author_Institution :
Coll. of Atmos. Sci., Lanzhou Univ., Lanzhou, China
Volume :
2
fYear :
2010
fDate :
28-31 Aug. 2010
Firstpage :
345
Lastpage :
348
Abstract :
Correlation between spatial extent and duration of severe droughts process and its statistical law is analyzed using Palmer Drought Severity Index (PDSI) through a newly developed system of drought process monitoring. Results indicate that during the period from late 1990s to early 2000s, the percentage of severe drought (PDSI<;-3.0) in China is unprecedented since 1960 under the background of global warming and the variation of the distributions of droughts coverage areas in different seasons is uneven. The distribution of spatial extent and durations of severe droughts follows a power-law, e.g. the spatial-temporal characteristics of severe droughts is independent to their scaling, namely, being scale free. In general the area of severe droughts is correlated closely with its duration, while the deviations of the linear fit from its correlation is also high.
Keywords :
atmospheric precipitation; global warming; hydrology; statistical analysis; China; Palmer Drought Severity Index; drought coverage area; drought duration; drought process monitoring; global warming; power-law; spatial duration; spatial extent; spatial-temporal characteristics; statistical law; Meteorology; Time frequency analysis; distribution; drought; duration; power-law;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Geoscience and Remote Sensing (IITA-GRS), 2010 Second IITA International Conference on
Conference_Location :
Qingdao
Print_ISBN :
978-1-4244-8514-7
Type :
conf
DOI :
10.1109/IITA-GRS.2010.5604141
Filename :
5604141
Link To Document :
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