TY - JOUR
T1 - The Effect of the Madden-Julian Oscillation on the Mesospheric Migrating Diurnal Tide
T2 - A Study Using SD-WACCM
AU - Yang, Chengyun
AU - Smith, Anne K.
AU - Li, Tao
AU - Dou, Xiankang
N1 - Publisher Copyright:
©2018. American Geophysical Union. All Rights Reserved.
PY - 2018/5/28
Y1 - 2018/5/28
N2 - The response of the mesospheric migrating diurnal (DW1) tide to the Madden-Julian oscillation (MJO) is investigated for the first time using a simulation from the Specified-Dynamic Whole Atmosphere Community Climate Model (SD-WACCM), which is driven by reanalysis data. Analysis shows that a significant connection exists between the MJO and the mesospheric DW1 tidal amplitude. During MJO phases 2 and 3, the convection anomalies are associated with enhancement in both the solar insolation absorption and latent heat release in the equatorial troposphere; these in turn lead to stronger DW1 forcing. Conversely, the forcing of DW1 by solar and latent heating in the troposphere is weaker during MJO phase 8. The difference of the tidal amplitude during the opposite MJO phases from the boreal winter mean state is ~15–20%. The parameterized gravity wave variations are found to have a significant impact on the DW1 tidal response in some phases of the MJO.
AB - The response of the mesospheric migrating diurnal (DW1) tide to the Madden-Julian oscillation (MJO) is investigated for the first time using a simulation from the Specified-Dynamic Whole Atmosphere Community Climate Model (SD-WACCM), which is driven by reanalysis data. Analysis shows that a significant connection exists between the MJO and the mesospheric DW1 tidal amplitude. During MJO phases 2 and 3, the convection anomalies are associated with enhancement in both the solar insolation absorption and latent heat release in the equatorial troposphere; these in turn lead to stronger DW1 forcing. Conversely, the forcing of DW1 by solar and latent heating in the troposphere is weaker during MJO phase 8. The difference of the tidal amplitude during the opposite MJO phases from the boreal winter mean state is ~15–20%. The parameterized gravity wave variations are found to have a significant impact on the DW1 tidal response in some phases of the MJO.
KW - Madden-Julian oscillation
KW - diurnal migrating t equatorial mesosphere
UR - https://www.scopus.com/pages/publications/85047484575
U2 - 10.1029/2018GL077956
DO - 10.1029/2018GL077956
M3 - Article
AN - SCOPUS:85047484575
SN - 0094-8276
VL - 45
SP - 5105
EP - 5114
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 10
ER -