Premium
Exceptionally Persistent Madden‐Julian Oscillation Activity Contributes to the Extreme 2020 East Asian Summer Monsoon Rainfall
Author(s) -
Zhang Wenjun,
Huang Zongci,
Jiang Feng,
Stuecker Malte F.,
Chen Guosen,
Jin FeiFei
Publication year - 2021
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2020gl091588
Subject(s) - teleconnection , madden–julian oscillation , climatology , monsoon , anticyclone , indian ocean , east asia , east asian monsoon , pacific decadal oscillation , geology , environmental science , oceanography , sea surface temperature , geography , el niño southern oscillation , china , meteorology , convection , archaeology
During June–July 2020, the record‐breaking flooding in the recent four decades struck the plum rain belt over China, Japan, and Korea. Concurrent with this persistent heavy rainfall, pronounced Indian Ocean basin warming (IOBW) was observed, following the previous El Niño event in the transition to La Niña‐like mean state this summer. This tropical Indo‐Pacific large‐scale thermal condition provided favorable conditions for rainfall surpluses over the plum rain belt via the western North Pacific anticyclone. Superimposed on the tropical Indo‐Pacific large‐scale thermal condition, an extraordinary long‐lasting and quasistationary Madden‐Julian Oscillation (MJO) active phase persisted in the Indian Ocean throughout June–July 2020, lasting for 59 days. The MJO‐associated teleconnection was mainly responsible for the extreme rainfall over the plum rain belt, which was facilitated by the conducive large‐scale Indo‐Pacific oceanic‐atmospheric condition.