Based on the historical records in Guangdong Province during the last 500a, the moist index sequence was reconstructed and analyzed by the correlation analysis, wavelet analysis and the power spcctrum analysis. The re...Based on the historical records in Guangdong Province during the last 500a, the moist index sequence was reconstructed and analyzed by the correlation analysis, wavelet analysis and the power spcctrum analysis. The resuits indicate that： 1 ） The El Nino events have evident correlations with the droughts happened in the west and north of Guangdong Province, which intensified the dryness and wetness distribution patterns in these areas in a certain degree. 2） Good correspondence relations exist among the moist index sequence, Greenland ice core oxygen isotope record and the winter-half-year temperature sequence in the eastern China, which showed pattern of moisture and temperature. 3） By applying the wavelet analysis to deal with icities are revealed, among which some can be attributed to the solar activities. At monsoon （especially the East Asian monsoon） activity and the human activity may an apparent monsoonal disposal the data, several apparent period. the same tithe, the ENSO event, also have some influences on the periodicities of the climatic changes in Guangdong Province. 4） Guangdong will persist in dry period before 2040 （±5 years） though some little waterlogged period will also exist in this interval, and after that great floods maybe take place in Guangdong. We think that the variety range of the dryness and wetness has increasing tendency in Guangdong Province in future several even hundred years.展开更多
Factor analysis was used to investigate the changes of dry-wet climate in the dry season in Yunnan during 1961-2007 based on observed data from 15 stations.Three common factors were extracted from the 9 climatic facto...Factor analysis was used to investigate the changes of dry-wet climate in the dry season in Yunnan during 1961-2007 based on observed data from 15 stations.Three common factors were extracted from the 9 climatic factors.The results showed that the dry-wet climate has evidently changed since the early 1960s.The general trends in the changes of drywet climate were described as slight decrease in humidity and gradual enhancement in drought intensity.The climate during 1960s-1980s was under weak-medium drought.But since early 1990s,dry conditions have markedly strengthened and continued due to uneven temporal distribution of rainfall and climate warming.展开更多
基金Under the auspices of the Natural Science Foundation of Guang dong Province(No.031522),the Fok Ying Tung Ed-ucation Foundation(No.91021)
文摘Based on the historical records in Guangdong Province during the last 500a, the moist index sequence was reconstructed and analyzed by the correlation analysis, wavelet analysis and the power spcctrum analysis. The resuits indicate that： 1 ） The El Nino events have evident correlations with the droughts happened in the west and north of Guangdong Province, which intensified the dryness and wetness distribution patterns in these areas in a certain degree. 2） Good correspondence relations exist among the moist index sequence, Greenland ice core oxygen isotope record and the winter-half-year temperature sequence in the eastern China, which showed pattern of moisture and temperature. 3） By applying the wavelet analysis to deal with icities are revealed, among which some can be attributed to the solar activities. At monsoon （especially the East Asian monsoon） activity and the human activity may an apparent monsoonal disposal the data, several apparent period. the same tithe, the ENSO event, also have some influences on the periodicities of the climatic changes in Guangdong Province. 4） Guangdong will persist in dry period before 2040 （±5 years） though some little waterlogged period will also exist in this interval, and after that great floods maybe take place in Guangdong. We think that the variety range of the dryness and wetness has increasing tendency in Guangdong Province in future several even hundred years.
基金supported by the program(40675045) from the National Natural Science Foundation of China
文摘Factor analysis was used to investigate the changes of dry-wet climate in the dry season in Yunnan during 1961-2007 based on observed data from 15 stations.Three common factors were extracted from the 9 climatic factors.The results showed that the dry-wet climate has evidently changed since the early 1960s.The general trends in the changes of drywet climate were described as slight decrease in humidity and gradual enhancement in drought intensity.The climate during 1960s-1980s was under weak-medium drought.But since early 1990s,dry conditions have markedly strengthened and continued due to uneven temporal distribution of rainfall and climate warming.
