Mesosphere and Lower Thermosphere Winds and Tidal Variations During the 2019 Antarctic Sudden Stratospheric Warming

Guiping Liu, Diego Janches, Jun Ma, Ruth S. Lieberman, Gunter Stober, Tracy Moffat-Griffin, Nicholas J. Mitchell, Jeong Han Kim, Changsup Lee, Damian J. Murphy

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7 Citations (SciVal)

Abstract

Realistic modeling of the winds and dynamical variations in the mesosphere and lower thermosphere (MLT) at Southern Hemisphere (SH) mid-to-high latitudes near 60°S where dramatic motions occur has been a challenge. This work presents an evaluation of the MLT zonal and meridional winds from ∼80 to 98 km altitude produced by the high-altitude version of the Navy Global Environmental Model (NAVGEM-HA) numerical weather prediction system during the Antarctic Sudden Stratospheric Warming (SSW) in September 2019. These results are compared with the coincident measurements by five meteor radars at Tierra del Fuego (TDF; 53.7°S, 67.7°W), King Edward Point (KEP; 54.3°S, 36.5°W), King Sejong Station (KSS; 62.2°S, 58.8°W), Rothera (ROT; 67.5°S, 68.0°W), and Davis (DAV; 68.6°S, 78.0°E) across SH mid-to-high latitudes. We find that the day-to-day variations in NAVGEM-HA winds related to tidal motions are overall consistent with variations in the radar winds, and the daily mean winds have a correlation of 0.7–0.9 between them. Three-hourly NAVGEM-HA winds have a correlation of ∼0.5 and mean difference <10 m/s to the radar observations at most stations, and the Root Mean Square (RMS) error ranges from ∼25 to 35 m/s. Above 90 km altitude, the correlation coefficient decreases, and the difference and RMS error increase, indicating an upper limit to the validity of the NAVGEM-HA results. Both the analyzed and observed winds reveal an enhancement in diurnal and semidiurnal tidal amplitude during this SH SSW. NAVGEM-HA shows some evidence that nonmigrating tidal enhancements are produced through the interaction of migrating tides with planetary waves.

Original languageEnglish
Article numbere2021JA030177
JournalJournal of Geophysical Research: Space Physics
Volume127
Issue number3
Early online date9 Mar 2022
DOIs
Publication statusPublished - 30 Mar 2022

Bibliographical note

Funding Information:
Dr. John McCormack provided the NAVGEM-HA analysis and contributed to the evaluation of the data and the drafting of the manuscript. We thank him for valuable discussions and suggestions. The operation of the SAAMER radar at Tierra del Feugo is supported by NASA SSO program and NESC assessment T1-17-0120. The authors appreciate the invaluable support of Jose Luis Hormaechea, Carlos Ferrer, Gerardo Connon, Luis Barbero, and Leandro Mazlov with the operation of SAAMER. SAAMER operations are partially supported through a Memorandum of Understanding between the University of La Plata and the Catholic University of America. We would like to thank the government of South Georgia and the South Sandwich Islands for their cooperation. The King Edward Point (KEP) and Rothera radars were supported by the Natural Environment Research Council (NERC) under Grants NE/K015117/1, NE/R001235/1, NE/R001391/1, and NE/K012614. The South Georgia meteor radar at KEP was installed by N. J. Mitchell and BAS in 2016, and it was supported by the SGWEX and DRAGON-WEX grants for which N. J. Mitchell and T. Moffat-Griffin were investigators. J.-H. Kim and C. Lee were supported by the Grant PE22020 from Korea Polar Research Institute. Support for the operation of the Davis meteor radar has been provided through Australian Antarctic Science project 4445. J. Ma was partially supported by NASA's Heliophysics Guest Investigator Program NNH19ZDA001N-HGIO.

Funding Information:
Dr. John McCormack provided the NAVGEM‐HA analysis and contributed to the evaluation of the data and the drafting of the manuscript. We thank him for valuable discussions and suggestions. The operation of the SAAMER radar at Tierra del Feugo is supported by NASA SSO program and NESC assessment T1‐17‐0120. The authors appreciate the invaluable support of Jose Luis Hormaechea, Carlos Ferrer, Gerardo Connon, Luis Barbero, and Leandro Mazlov with the operation of SAAMER. SAAMER operations are partially supported through a Memorandum of Understanding between the University of La Plata and the Catholic University of America. We would like to thank the government of South Georgia and the South Sandwich Islands for their cooperation. The King Edward Point (KEP) and Rothera radars were supported by the Natural Environment Research Council (NERC) under Grants NE/K015117/1, NE/R001235/1, NE/R001391/1, and NE/K012614. The South Georgia meteor radar at KEP was installed by N. J. Mitchell and BAS in 2016, and it was supported by the SGWEX and DRAGON‐WEX grants for which N. J. Mitchell and T. Moffat‐Griffin were investigators. J.‐H. Kim and C. Lee were supported by the Grant PE22020 from Korea Polar Research Institute. Support for the operation of the Davis meteor radar has been provided through Australian Antarctic Science project 4445. J. Ma was partially supported by NASA's Heliophysics Guest Investigator Program NNH19ZDA001N‐HGIO.

Keywords

  • Antarctic stratospheric warming
  • high altitude data assimilation system
  • mesosphere and lower thermosphere
  • meteor radar winds
  • tides
  • upper atmosphere

ASJC Scopus subject areas

  • Space and Planetary Science
  • Geophysics

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