Features of Interdecadal Changes of the East Asian Summer Monsoon and Similarity and Discrepancy in ERA‐40 and NCEP/NCAR Reanalysis Data

• Published in: Chinese Journal of Geophysics
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 2007
• Subjects: Antarctic; Pacific; The Antarctic; Antarc*
• Online Access: http://dx.doi.org/10.1002/cjg2.1164; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fcjg2.1164; https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1002/cjg2.1164

Abstract This study investigates the features of interdecadal changes of the East Asian summer monsoon (EASM) by using the European Centre for Medium‐Range Weather Forecasts (ECMWF) Reanalysis (ERA‐40), the National Centers for Environmental Prediction/National Center for Atmospherics Research (NCEP/NCAR) Reanalysis and observations for the period 1958~1998. It is found that the EASM experienced the decadal weakening in the late 1970s associated with the decreasing surface air temperature, the rising sea level pressure and the northern wind anomalies over Yangtze‐Huaihe valley. Additionally, the interdecadal changes appear in those systems related, such as the subtropical high over the northwestern Pacific, the westerlies in the middle latitudes, the Australian high and the Antarctic Oscillation. However, both reanalysis data sets showing similar features of the interdecadal variation still have many differences in decadal time scale.