Variation Features of Drought and Flood in Guizhou Province and Their Relationships with W PSH and SST
Based on the daily observation data of 16 stations of Guizhou Province from the National Meteorological Information Center, the reanalysis data from NCEP/NCAR and the global SST (Sea Surface Temperature)data from NOAA,the spatial and temporal distri-bution of drought and flood based on SPI in Guizhou Province was analyzed by using EOF and Morlet wavelet analysis methods,firstly. And the atmospheric circulation in abnormal drought/flood years in Guizhou Province and relationship between SPI and global SST were also researched.The results are as follows:(1 )The consistent anomaly distribution was the main spatial model of drought/flood varia-tion feature in Guizhou Province in each season,and in spring and summer it presented drought trend in some extent.The drought/flood in spring and autumn had a two-year and ten-year periodic fluctuation,while in summer and winter there was two-year,three-year and five-year periodic fluctuation.(2)If the Western Pacific subtropical high (WPSH)became stronger (weaker)and west-ward (eastward),there was less (more)rainfall,and drought (flood)would happen in spring and autumn.If the WPSH was south-ward (northward)and its position was eastward (westward),then there was less (more)rainfall,and drought (flood)would appear in winter and summer.(3)The autumn SPI had a significant negative correlation with global SST during the previous period and the corresponding period.The key area was the eastern Indian ocean and the western Pacific.
Guizhou Provincedistribution of drought and floodthe Western Pacific subtropical highsea surface temperaturecorre-lation
NETL
NSTL
万方数据
维普
