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.
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.
the Creative Commons Attribution 4.0 License.
Research article
| 
17 Jun 2022
Research article |
| 17 Jun 2022
| 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
CAS Key Laboratory of Geospace Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui, China
Mengcheng National Geophysical Observatory, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui, China
CAS Center for Excellence in Comparative Planetology, University of
Science and Technology of China, Hefei, Anhui, China
CAS Key Laboratory of Geospace Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui, China
Mengcheng National Geophysical Observatory, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui, China
CAS Center for Excellence in Comparative Planetology, University of
Science and Technology of China, Hefei, Anhui, China
CAS Key Laboratory of Geospace Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui, China
Mengcheng National Geophysical Observatory, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui, China
CAS Center for Excellence in Comparative Planetology, University of
Science and Technology of China, Hefei, Anhui, China
James M. Russell III
Center for Atmospheric Sciences, Hampton University, Hampton, VA, USA
Xiankang Dou
CAS Key Laboratory of Geospace Environment, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui, China
Mengcheng National Geophysical Observatory, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui, China
CAS Center for Excellence in Comparative Planetology, University of
Science and Technology of China, Hefei, Anhui, China
School of Electronic Information, Wuhan University, Wuhan, Hubei,
China
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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.
The MLT DW1 amplitude is suppressed during El Niño winters in both satellite observation and...
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