Hall, C.M. and Dyrland, M.E. and Tsutsumi, M. and Mulligan, F.J.
(2012)
Temperature trends at 90 km over Svalbard, Norway (78°N l6°E),
seen in one decade of meteor radar observations.
Journal of Geophysical Research, 117 (D08104).
ISSN 0148-0227
Abstract
Temperatures at 90 km altitude above Svalbard (78°N, l6°E) have been determined
using a meteor wind radar and subsequently calibrated by satellite measurements for
the period autumn 2001 to present. The dependence of the temperatures on solar driving
has been investigated using the Ottawa 10.7 em flux as a proxy. Removing the response of
the temperatures to the seasonal and solar cycle variations yields a residual time series
which exhibits the negative trend of -4 ± 2 K decade -I. We indicate that, given the
month-to-month variability and memory in the time series, for a 90% confidence in this
trend, we require only 55 months of data- considerably less than the amount available.
Cooling of the middle atmosphere, which would be strongly supported by these results,
would result in contraction and subsequent lowering of pressure surfaces; we explain that
including a negative trend in the pressure model used to obtain temperatures from meteor
train echo fading times would also merely serve to augment the observed 90 km cooling.
Item Type: |
Article
|
Keywords: |
Temperature trends; Svalbard; Norway; meteor radar observations; |
Academic Unit: |
Faculty of Science and Engineering > Experimental Physics |
Item ID: |
4769 |
Identification Number: |
https://doi.org/10.1029/2011JD017028 |
Depositing User: |
Dr. Frank Mulligan
|
Date Deposited: |
10 Feb 2014 14:03 |
Journal or Publication Title: |
Journal of Geophysical Research |
Publisher: |
American Geophysical Union (AGU |
Refereed: |
Yes |
URI: |
|
Use Licence: |
This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available
here |
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