Articles | Volume 22, issue 12
https://doi.org/10.5194/acp-22-7861-2022
https://doi.org/10.5194/acp-22-7861-2022
Research article
 | 
17 Jun 2022
Research article |  | 17 Jun 2022

Suppressed migrating diurnal tides in the mesosphere and lower thermosphere region during El Niño in northern winter and its possible mechanism

Yetao Cen, Chengyun Yang, Tao Li, James M. Russell III, and Xiankang Dou

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Latest update: 26 May 2024
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Short summary
The MLT DW1 amplitude is suppressed during El Niño winters in both satellite observation and SD-WACCM simulations. The suppressed Hough mode (1, 1) in the tropopause region propagates vertically to the MLT region, leading to decreased DW1 amplitude. The latitudinal zonal wind shear anomalies during El Niño winters would narrow the waveguide and prevent the vertical propagation of DW1. The gravity wave drag excited by ENSO-induced anomalous convection could also modulate the MLT DW1 amplitude.
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