Effects of temperature anomalies on the Palmer Drought Severity Index in the central United States

被引:8
作者
Hu, Q
Willson, GD
机构
[1] Univ Nebraska, Sch Nat Resource Sci, Lincoln, NE 68583 USA
[2] Univ Missouri, USGS, No Prairie Wildlife Res Ctr, Columbia, MO USA
[3] Univ Missouri, Dept Soil & Atmospher Sci, Columbia, MO USA
关键词
central united states; interpreting reconstructed PDSI; observation; Palmer Drought Severity Index; precipitation; temperature; theoretical analysis;
D O I
10.1002/1097-0088(200012)20:15<1899::AID-JOC588>3.0.CO;2-M
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
The purpose of this study is to improve our understanding of temperature and precipitation effects on the Palmer Drought Severity Index (PDSI). Both theoretical and observational analyses were applied to separate and compare temperature and precipitation effects on PDSI. The results showed that because of the dependence of PDSI on the 'climatologically appropriate rainfall', which is a function of time and varies with surface air temperature, the PDSI can be equally affected by temperature and precipitation, when both have similar magnitudes of anomalies. Calculations using observational data further illustrated the temperature influence on PDSI in different climate regions in the central United States. The temperature effect on PDSI complicates the usage of the index in interpreting precipitation anomalies and its application in inferring precipitation variations, particularly from reconstructed PDSI. Copyright (C) 2000 Royal Meteorological Society.
引用
收藏
页码:1899 / 1911
页数:13
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