Role of Seasonal Transitions and the Westerlies in the Interannual Variability of the East Asian Summer Monsoon Precipitation

TitleRole of Seasonal Transitions and the Westerlies in the Interannual Variability of the East Asian Summer Monsoon Precipitation
Publication TypeJournal Article
Year of Publication2017
AuthorsChiang, John C. H., Swenson Leif M., and Kong Wenwen
Date Published06/2017
Abstract

A recent hypothesis holds that changes to the East Asian summer rainfall are characterized by changes in the timing and duration of its intraseasonal stages, controlled by the meridional position of the westerlies relative to the Tibetan Plateau. This hypothesis is examined in the context of the leading mode of East Asian summer (July–August) rainfall. One phase of this “tripole” mode—characterized by less rainfall over central eastern China and increased rainfall over northeastern and southeastern China—is tied to an earlier termination of Meiyu that results in a significantly shorter Meiyu and longer Midsummer stage. This phase also exhibits an earlier northward transition of the westerlies to the north of the Plateau, essentially mirroring the changes to precipitation seasonality. The reverse does not hold true for the opposite phase. Our results show direct observational evidence for the meridional position of the westerlies to control East Asian summer monsoon seasonality.

DOI10.1002/2017GL072739

A recent hypothesis holds that changes to the East Asian summer rainfall are characterized by changes in the timing and duration of its intraseasonal stages, controlled by the meridional position of the westerlies relative to the Tibetan Plateau. This hypothesis is examined in the context of the leading mode of East Asian summer (July–August) rainfall. One phase of this “tripole” mode—characterized by less rainfall over central eastern China and increased rainfall over northeastern and southeastern China—is tied to an earlier termination of Meiyu that results in a significantly shorter Meiyu and longer Midsummer stage. This phase also exhibits an earlier northward transition of the westerlies to the north of the Plateau, essentially mirroring the changes to precipitation seasonality. The reverse does not hold true for the opposite phase. Our results show direct observational evidence for the meridional position of the westerlies to control East Asian summer monsoon seasonality.

DOI: 10.1002/2017GL072739
Year of Publication: 2017
Citation:
Chiang, JC, LM Swenson, and W Kong.  2017.  "Role of Seasonal Transitions and the Westerlies in the Interannual Variability of the East Asian Summer Monsoon Precipitation."  doi:10.1002/2017GL072739.