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The Effect of the Madden‐Julian Oscillation on the Mesospheric Migrating Diurnal Tide: A Study Using SD‐WACCM

Journal Article · · Geophysical Research Letters
DOI:https://doi.org/10.1029/2018GL077956· OSTI ID:1454379
 [1];  [2];  [3];  [3]
  1. CAS Key Laboratory of Geospace Environment, School of Earth and Space Sciences University of Science and Technology of China Hefei China, National Center for Atmospheric Research Boulder CO USA, Mengcheng National Geophysical Observatory, School of Earth and Space Sciences University of Science and Technology of China Hefei China
  2. National Center for Atmospheric Research Boulder CO USA
  3. CAS Key Laboratory of Geospace Environment, School of Earth and Space Sciences University of Science and Technology of China Hefei China, Mengcheng National Geophysical Observatory, School of Earth and Space Sciences University of Science and Technology of China Hefei China
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Abstract

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.

Sponsoring Organization:
USDOE
OSTI ID:
1454379
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 10 Vol. 45; ISSN 0094-8276
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English

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