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《S11 副热带季风研究及预报预测业务应用》 2012年
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Evaluation of the Twentieth Century Reanalysis data in describing the East Asian winter monsoon variability

SEONGJOONG KIM  
【摘要】:The Twentieth Century Reanalysis(20thCR) data released in 2010 cover the period of 1871 to 2010 and are one of the longest reanalysis datasets available worldwide.Using the EAR-40,ERA-Interim,and NCEP/NCAR reanalysis data,the HadSLP2 data and the meteorological temperature records over eastern China,the performances of the 20thCR in reproducing the spatial patterns and temporal variability of the East Asian winter monsoon(EAWM) are examined in this study.Results indicate that the 20thCR data: 1) can accurately reproduce the most typical configuration patterns of all sub-factors involved in the EAWM system although there are some differences in the main circulation fields over East Asia in comparison to the ERA-40 reanalysis data,2) is reliable and stable in describing the temporal variability of EAWM since the 1950s,but less reliable before 1930s,3) can describe the high-frequency variability of EAWM better than the low-frequency fluctuations,especially in the early period.In conclusion,a caution must be taken when using the the 20thCR data to study inter-decadal variabilities or long-term trends of the EAWM,especially prior to the 1930s.

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