Coordinated Observations of 8- and 6-hr Tides in the Mesosphere and Lower Thermosphere by Three Meteor Radars Near 60°S Latitude

Guiping Liu; Diego Janches; Ruth S. Lieberman; Tracy Moffat-Griffin; David C. Fritts; Nicholas J. Mitchell

doi:10.1029/2019GL086629

Coordinated Observations of 8- and 6-hr Tides in the Mesosphere and Lower Thermosphere by Three Meteor Radars Near 60^°S Latitude

Guiping Liu, Diego Janches, Ruth S. Lieberman, Tracy Moffat-Griffin, David C. Fritts, Nicholas J. Mitchell

Department of Electronic & Electrical Engineering

Research output: Contribution to journal › Article › peer-review

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Abstract

Atmospheric 8- and 6-hr tides are observed for the first time in the zonal and meridional winds at ~82–97 km altitudes simultaneously at Tierra del Fuego (TDF; 53.7°S, 67.7°W), King Edward Point (KEP; 54.3°S, 36.5°W), and Rothera (ROT; 67.5°S, 68.0°W) at Southern Hemisphere (SH) middle-to-high latitudes during long time spans, allowing to reveal climatology and migrating nature. The monthly averaged amplitudes vary between ~1 and 8 m/s for the 8-hr tides while the amplitudes of 6-hr tides are smaller ~0.5–4 m/s. Both tides exhibit an annual pattern having the amplitude maxima during SH winter and minima in SH summer. The tidal phases are smaller (earlier) in the zonal wind than in the meridional wind by about 90°. The phase differences observed between TDF and KEP, which are located at similar latitudes but different longitudes suggest the propagation of migrating tides. The study finds that 8- and 6-hr tides are correlated.

Original language	English
Article number	e2019GL086629
Journal	Geophysical Research Letters
Volume	47
Issue number	1
Early online date	3 Jan 2020
DOIs	https://doi.org/10.1029/2019GL086629
Publication status	Published - 16 Jan 2020

Funding

D. J., R. L., and G. L. are supported by the NASA TIMED and ISFM Heliophysics programs. The data used in this study are publicly available at these sites (http://millstonehill.haystack.mit.edu and http://psddb.nerc-bas.ac.uk). The operation of the SAAMER radar at TDF is supported by NASA SSO program, NESC assessment TI-17-0120, and NSF Grant AGS-1647354. The authors appreciate the invaluable support of Jose Luis Hormaechea, Carlos Ferrer, Gerardo Connon, and Luis Barbero with the operation of SAAMER. SAAMER observations are partially supported through a Memorandum of Understanding between the University of La Plata and the Catholic University of America.

Keywords

atmospheric tides
mesosphere and lower thermosphere
middle-to-high latitude
migrating tides
terdiurnal tides
wave interaction

ASJC Scopus subject areas

Geophysics
General Earth and Planetary Sciences

Access to Document

10.1029/2019GL086629

Liu_et_al-2020-Geophysical_Research_Letters.pdf
This is the peer reviewed version of the following article: Liu, G., Janches, D., Lieberman, R. S., Moffat‐Griffin, T., Fritts, D. C., & Mitchell, N. J. ( 2020). Coordinated Observations of 8‐ and 6‐hr Tides in the Mesosphere and Lower Thermosphere by Three Meteor Radars Near 60°S Latitude. Geophysical Research Letters, 47, e2019GL086629., which has been published in final form at https://doi.org/10.1029/2019GL086629. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
Accepted author manuscript, 2.21 MBLicence: Unspecified

Cite this

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title = "Coordinated Observations of 8- and 6-hr Tides in the Mesosphere and Lower Thermosphere by Three Meteor Radars Near 60°S Latitude",

abstract = "Atmospheric 8- and 6-hr tides are observed for the first time in the zonal and meridional winds at ~82–97 km altitudes simultaneously at Tierra del Fuego (TDF; 53.7°S, 67.7°W), King Edward Point (KEP; 54.3°S, 36.5°W), and Rothera (ROT; 67.5°S, 68.0°W) at Southern Hemisphere (SH) middle-to-high latitudes during long time spans, allowing to reveal climatology and migrating nature. The monthly averaged amplitudes vary between ~1 and 8 m/s for the 8-hr tides while the amplitudes of 6-hr tides are smaller ~0.5–4 m/s. Both tides exhibit an annual pattern having the amplitude maxima during SH winter and minima in SH summer. The tidal phases are smaller (earlier) in the zonal wind than in the meridional wind by about 90°. The phase differences observed between TDF and KEP, which are located at similar latitudes but different longitudes suggest the propagation of migrating tides. The study finds that 8- and 6-hr tides are correlated.",

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AU - Fritts, David C.

AU - Mitchell, Nicholas J.

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N2 - Atmospheric 8- and 6-hr tides are observed for the first time in the zonal and meridional winds at ~82–97 km altitudes simultaneously at Tierra del Fuego (TDF; 53.7°S, 67.7°W), King Edward Point (KEP; 54.3°S, 36.5°W), and Rothera (ROT; 67.5°S, 68.0°W) at Southern Hemisphere (SH) middle-to-high latitudes during long time spans, allowing to reveal climatology and migrating nature. The monthly averaged amplitudes vary between ~1 and 8 m/s for the 8-hr tides while the amplitudes of 6-hr tides are smaller ~0.5–4 m/s. Both tides exhibit an annual pattern having the amplitude maxima during SH winter and minima in SH summer. The tidal phases are smaller (earlier) in the zonal wind than in the meridional wind by about 90°. The phase differences observed between TDF and KEP, which are located at similar latitudes but different longitudes suggest the propagation of migrating tides. The study finds that 8- and 6-hr tides are correlated.

AB - Atmospheric 8- and 6-hr tides are observed for the first time in the zonal and meridional winds at ~82–97 km altitudes simultaneously at Tierra del Fuego (TDF; 53.7°S, 67.7°W), King Edward Point (KEP; 54.3°S, 36.5°W), and Rothera (ROT; 67.5°S, 68.0°W) at Southern Hemisphere (SH) middle-to-high latitudes during long time spans, allowing to reveal climatology and migrating nature. The monthly averaged amplitudes vary between ~1 and 8 m/s for the 8-hr tides while the amplitudes of 6-hr tides are smaller ~0.5–4 m/s. Both tides exhibit an annual pattern having the amplitude maxima during SH winter and minima in SH summer. The tidal phases are smaller (earlier) in the zonal wind than in the meridional wind by about 90°. The phase differences observed between TDF and KEP, which are located at similar latitudes but different longitudes suggest the propagation of migrating tides. The study finds that 8- and 6-hr tides are correlated.

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Coordinated Observations of 8- and 6-hr Tides in the Mesosphere and Lower Thermosphere by Three Meteor Radars Near 60^°S Latitude

Abstract

Funding

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

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DRAGON-WEX: The Drake Passage and Southern Ocean Wave Experiment

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Coordinated Observations of 8- and 6-hr Tides in the Mesosphere and Lower Thermosphere by Three Meteor Radars Near 60°S Latitude

Abstract

Funding

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Projects

DRAGON-WEX: The Drake Passage and Southern Ocean Wave Experiment

Cite this

Coordinated Observations of 8- and 6-hr Tides in the Mesosphere and Lower Thermosphere by Three Meteor Radars Near 60^°S Latitude