Home > Research > Publications & Outputs > Evidence for stratospheric sudden warming effec...

Associated organisational unit

Electronic data

  • GRL53270 (final version)

    Rights statement: ©2015. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited © 2015 American Geophysical Union

    Final published version, 531 KB, PDF-document

    Available under license: CC BY: Creative Commons Attribution 4.0 International License

Links

Text available via DOI:

View graph of relations

Evidence for stratospheric sudden warming effects on the upper thermosphere derived from satellite orbital decay data during 1967–2013

Research output: Contribution to journalJournal article

Published
<mark>Journal publication date</mark>13/08/2015
<mark>Journal</mark>Geophysical Research Letters
Issue number15
Volume42
Number of pages9
Pages (from-to)1-9
<mark>State</mark>Published
Early online date29/07/15
<mark>Original language</mark>English

Abstract

We investigate possible impact of stratospheric sudden warmings (SSWs) on the thermosphere by using long-term data of the global average thermospheric total mass density derived from satellite orbital drag during 1967–2013. Residuals are analyzed between the data and empirical Global Average Mass Density Model (GAMDM) that takes into account density variability due to solar activity, season, geomagnetic activity, and long-term trend. A superposed epoch analysis of 37 SSW events reveals a density reduction of 3–7% at 250–575 km around the time of maximum polar vortex weakening. The relative density perturbation is found to be greater at higher altitudes. The temperature perturbation is estimated to be −7.0 K at 400 km. We show that the density reduction can arise from enhanced wave forcing from the lower atmosphere.

Bibliographic note

©2015. The Authors.
This is an open access article under the terms of the Creative Commons
Attribution License, which permits use, distribution and reproduction in any
medium, provided the original work is properly cited.

© 2015 American Geophysical Union