TITLE:
Contrasting Impacts of Three Types of ENSO Event on Boreal Autumn Rainfall over Southwest China
AUTHORS:
Jiajie Hu, Wei Wang, Yining Tan
KEYWORDS:
El Niño-Southern Oscillation, Autumn Rainfall, Integrated Water Vapor Transport, Southwest China
JOURNAL NAME:
Journal of Geoscience and Environment Protection,
Vol.9 No.10,
October
19,
2021
ABSTRACT: The autumn precipitation over southwest China is one of the main causes of
meteorological disasters. Using observed monthly station rainfall data and HadISST
and NCEP/NCAR analysis data, the impacts of three types of El Niño-Southern Oscillation
(ENSO) events on the boreal autumn rainfall over southwest China were determined.
Over southwest China, autumn rainfall constitutes > 20% of the total annual rainfall
and a marked decline in autumn rainfall commenced around 1990. During La Niña events,
there is surplus (deficit) over the middle (northwest and southeast) of southwest
China. In cnetral Pacific (CP) El Niño events, the autumn rainfall anomaly shows
a deficiency over China. The large-scale atmospheric circulation anomalies in the
three ENSO categories also exhibit distinct characteristics. During CP El Niño autumns,
the pressure anomaly over the North Pacific Ocean displays a “” structure, with
a high-pressure anomaly over the Asian continent. An anomalous cyclone appears over
the western North Pacific (WNP). In EP El Niño autumns, the pressure anomaly over
the North Pacific Ocean has a “” structure, with a low-pressure anomaly over the
Asian continent. An anomalous anticyclone appears over the WNP and the 500-hPa anomalies
are opposite to those of CP El Niño events. During La Niña autumns, the characteristics
of circulation present the opposite structure to those of CP El Niño events. This work is of certain
significance for an in-depth understanding of the impacts of ENSO on the autumn precipitation over southwest China.