Articles | Volume 42, issue 1
https://doi.org/10.5194/angeo-42-1-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-42-1-2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
High-time-resolution analysis of meridional tides in the upper mesosphere and lower thermosphere at mid-latitudes measured by the Falkland Islands SuperDARN radar
British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, UK
Andrew J. Kavanagh
British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, UK
Neil Cobbett
British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, UK
Paul Breen
British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, UK
Tim Barnes
British Antarctic Survey, High Cross, Madingley Road, Cambridge, CB3 0ET, UK
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Christopher John Scott, Matthew N. Wild, Luke Anthony Barnard, Bingkun Yu, Tatsuhiro Yokoyama, Michael Lockwood, Cathryn Mitchel, John Coxon, and Andrew Kavanagh
Ann. Geophys., 42, 395–418, https://doi.org/10.5194/angeo-42-395-2024, https://doi.org/10.5194/angeo-42-395-2024, 2024
Short summary
Short summary
Long-term change in the ionosphere are expected due to increases in greenhouse gases in the lower atmosphere. Empirical formulae are used to estimate height. Through comparison with independent data we show that there are seasonal and long-term biases introduced by the empirical model. We conclude that estimates of long-term changes in ionospheric height need to account for these biases.
Neil P. Hindley, Nicholas J. Mitchell, Neil Cobbett, Anne K. Smith, Dave C. Fritts, Diego Janches, Corwin J. Wright, and Tracy Moffat-Griffin
Atmos. Chem. Phys., 22, 9435–9459, https://doi.org/10.5194/acp-22-9435-2022, https://doi.org/10.5194/acp-22-9435-2022, 2022
Short summary
Short summary
We present observations of winds in the mesosphere and lower thermosphere (MLT) from a recently installed meteor radar on the remote island of South Georgia (54° S, 36° W). We characterise mean winds, tides, planetary waves, and gravity waves in the MLT at this location and compare our measured winds with a leading climate model. We find that the observed wintertime winds are unexpectedly reversed from model predictions, probably because of missing impacts of secondary gravity waves in the model.
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Short summary
Solar tides in the atmosphere are driven by solar heating on the dayside of the Earth. They result in large-scale periodic motion of the upper atmosphere. This motion can be measured by ground-based radars. This paper shows that making measurements at a higher time resolution than the standard operation provides a better description of higher-frequency tidal variations. This will improve the inputs to empirical atmospheric models and the benefits of data assimilation.
Solar tides in the atmosphere are driven by solar heating on the dayside of the Earth. They...