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Preliminary Analysis of Drought/Flood Events in Early-Summer over the Central Shaanxi Plain during the Past 500 Years

Artikel i vetenskaplig tidskrift
Författare Hong Yin
P Gao
H Liu
X Shao
Hans W. Linderholm
Publicerad i Journal of Nanjing Institute of Meteorology
Volym 30
Nummer/häfte 1
Sidor 51-56
Publiceringsår 2007
Publicerad vid Institutionen för geovetenskaper
Sidor 51-56
Språk other
Ämneskategorier Geovetenskap och miljövetenskap

Sammanfattning

In this study, the variation characteristics of extreme drought and flood events during the past 500 yearswere analyzed using the early2summer dryness indices series reconstructed by tree ring width chronologies of Huashan Pine samp led at the HuashanMountain. Comparisons between the dryness indices and the Palmer indices show that the dryness indices could be used to figure out the drought and flood events in the central Shaanxi p lain. There were 18 extreme droughts and 11 extreme floods events in earlysummer detected in this area during the past 500 years. Most of the events could be found in the historical documents, excep t that a flood event was detected from the dryness index but a drought event was recorded in the historical documents in A. D. 1521. There are also four eventswhich have no corresponding records in the historical documents in A. D. 1513, 1574, 1675 and 1945, respectively. Nine continuous drought periods and ten continuous flood periods are significant in the past 500 years. The drought and flood events occurred with high frequency in the sixteenth and the nineteenth centuries, but were less in the seventeenth and eighteenth centuries. The drought events are obviousmore than the flood events in the twentieth century

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