TY - JOUR
T1 - Modulation of the boreal wintertime Madden-Julian oscillation by the stratospheric quasi-biennial oscillation
AU - Yoo, Changhyun
AU - Son, Seok Woo
N1 - Publisher Copyright:
© 2016. The Authors.
PY - 2016/2/16
Y1 - 2016/2/16
N2 - Madden-Julian oscillation (MJO), the dominant mode of intraseasonal variability in the tropical troposphere, has a significant impact on global weather and climate. Here we present that the year-to-year variation of the MJO activity shows significant changes with the quasi-biennial oscillation (QBO) in the tropical stratosphere. Specifically, the boreal winter MJO amplitude, evaluated by various metrics, is typically stronger than normal during the QBO easterly phase at 50 hPa and weaker than normal during the QBO westerly phase at 50 hPa. This relationship, which is possibly mediated by the QBO-related static stability and/or vertical wind shear changes in the tropical upper troposphere and lower stratosphere, is robust whether or not the activeness of the MJO or QBO is taken into account. This result suggests a new potential route from the stratosphere that regulates the organized tropical convection, helping to improve the prediction skill of the boreal winter MJO.
AB - Madden-Julian oscillation (MJO), the dominant mode of intraseasonal variability in the tropical troposphere, has a significant impact on global weather and climate. Here we present that the year-to-year variation of the MJO activity shows significant changes with the quasi-biennial oscillation (QBO) in the tropical stratosphere. Specifically, the boreal winter MJO amplitude, evaluated by various metrics, is typically stronger than normal during the QBO easterly phase at 50 hPa and weaker than normal during the QBO westerly phase at 50 hPa. This relationship, which is possibly mediated by the QBO-related static stability and/or vertical wind shear changes in the tropical upper troposphere and lower stratosphere, is robust whether or not the activeness of the MJO or QBO is taken into account. This result suggests a new potential route from the stratosphere that regulates the organized tropical convection, helping to improve the prediction skill of the boreal winter MJO.
KW - MJO
KW - QBO
KW - interannual variability
KW - intraseasonal variability
UR - http://www.scopus.com/inward/record.url?scp=84959441574&partnerID=8YFLogxK
U2 - 10.1002/2016GL067762
DO - 10.1002/2016GL067762
M3 - Article
AN - SCOPUS:84959441574
SN - 0094-8276
VL - 43
SP - 1392
EP - 1398
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 3
ER -