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

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

doi:https://doi.org/10.5194/acp-22-7861-2022

Articles | Volume 22, issue 12

https://doi.org/10.5194/acp-22-7861-2022

© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-22-7861-2022

© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 22, issue 12

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

Supplement

https://doi.org/10.5194/acp-22-7861-2022-supplement

Data sets

Suppressed migrating diurnal tides in the MLT region during El Niño in Northern Winter and its possible mechanism Yetao Cen, Chengyun Yang*, Tao Li*, Jia Yue, James M. Russell III, and Xiankang Dou https://doi.org/10.6084/m9.figshare.19777918

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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.