The Relationship between the Interdecadal Variation of Summer Precipitation and Its Interannual Variability over the Middle and Lower Reaches of the Yangtze River Valley

The intensity of summer precipitation inter- annual variability is strongest over the middle and lower reaches of the Yangtze River Valley （MLYRV）. The vari- ability is larger than 1.5 mm d^-1 and up to 35%-40% of the climatological mean summer precipitation. The rela- tionship between the interdeca...

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Published inAtmospheric and oceanic science letters = Daqi-he-haiyang-kexue-kuaibao Vol. 8; no. 3; pp. 127 - 133
Main Author FU Yuan-Hai
Format Journal Article
LanguageEnglish
Published Climate Change Research Center,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China 2015
Subjects
ENSO事件
中东
夏季降水
太平洋十年涛动
年代际变化
年际变率
西北太平洋副热带高压
长江流域
interdecadal variation
summer precipitation
interannual variability
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ISSN1674-2834
2376-6123
DOI10.1080/16742834.2015.11447249

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Summary:The intensity of summer precipitation inter- annual variability is strongest over the middle and lower reaches of the Yangtze River Valley （MLYRV）. The vari- ability is larger than 1.5 mm d^-1 and up to 35%-40% of the climatological mean summer precipitation. The rela- tionship between the interdecadal change in the intensity of summer precipitation and its interannual variability over this area is investigated, by analyzing five gauged and re-constructed precipitation datasets. The relationship is found to be very weak over the MLYRV, with a correla- tion coefficient of only approximately 0.10. The Pacific Decadal Oscillation influences the western North Pacific subtropical high, which is responsible for the interdecadal change in summer precipitation over the MLYRV. However, the precipitation interannual variability is closely related to the ENSO events in the preceding winter due to its impact on the meridional displacement of the East Asian westerly jet. Different physical mechanisms cause different interdecadal variation in the intensity of summer precipitation and its interannual variability, and thus result in a poor relationship.
Bibliography:The intensity of summer precipitation inter- annual variability is strongest over the middle and lower reaches of the Yangtze River Valley （MLYRV）. The vari- ability is larger than 1.5 mm d^-1 and up to 35%-40% of the climatological mean summer precipitation. The rela- tionship between the interdecadal change in the intensity of summer precipitation and its interannual variability over this area is investigated, by analyzing five gauged and re-constructed precipitation datasets. The relationship is found to be very weak over the MLYRV, with a correla- tion coefficient of only approximately 0.10. The Pacific Decadal Oscillation influences the western North Pacific subtropical high, which is responsible for the interdecadal change in summer precipitation over the MLYRV. However, the precipitation interannual variability is closely related to the ENSO events in the preceding winter due to its impact on the meridional displacement of the East Asian westerly jet. Different physical mechanisms cause different interdecadal variation in the intensity of summer precipitation and its interannual variability, and thus result in a poor relationship.
11-5693/P
interdecadal variation, interannual variability, summer precipitation
ISSN:1674-2834
2376-6123
DOI:10.1080/16742834.2015.11447249