关键词: 湖南, 气象干旱日数, 空间分布, 气候分区, 时间变化

Abstract: The spatial and temporal distribution of meteorological drought days was analyzed by using of Empirical Orthogonal Function（EOF），Rotated Empirical Orthogonal Function（REOF）and wavelet analysis methods，based on daily meteorological data from 88 meteorological stations in Hunan province from 1960 to 2009，according to Comprehensive Meteorological Drought Index（CI）recommended by Classification of Meteorological Drought Category of GB/T20481-2006.The results showed that total meteorological drought days in southern Hunan were more than that of in northern Hunan.There were high value areas with the number of slight meteorological drought days in the upper and middle reaches of Xiangjiang river，northwest of Changde to Huaihua.The moderate meteorological drought days were in the central，north of southern Hunan and northern Hunan However，the severe meteorological drought days were in the central，southern，northern and western Hunan.The center of extreme meteorological drought days was in the Hengshao Basin.The spatial distribution of meteorological drought days was classified into five climatic types in whole province，including south Hunan，northeast，northwest，west and central Hunan，according to EOF and REOF analysis Meteorological drought days were not significant change in all climatic types in last 50 years，but they had an obvious interannual variability.Meteorological drought days in the west Hunan have decreased since the beginning of 21st century，but those in other four climate types have increased.There was an obvious periods of 2-3years and 4-6years according to Morlet wavelet analysis.The results could provide the scientific basis for drought resistant countermeasures in Hunan province.

Key words: Hunan, Meteorological drought days, Spatial distribution, Climate division, Temporal variation