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On correlations between the North Atlantic Oscillation, geopotential heights, and geomagnetic activity

Thejll, Peter; Christiansen, Bo and Gleisner, Hans LU (2003) In Geophysical Research Letters 30(6). p.1-80
Abstract
We investigate correlations between geomagnetic activity indices, theNorth Atlantic Oscillation (NAO), and stratospheric geopotentialheights. It is shown that the correlation between the geomagnetic indexAp and the NAO index is high and significant since about 1970, that itis significant during winter only, that it was not significant beforeabout 1970, and that the correlations are dominated by quasi-decadalscales of variability. Analysis of the spatial pattern of correlations,restricted to the Northern Hemisphere and wintertime, shows thatsignificant correlations between Ap and sea-level pressures and betweenAp and stratospheric geopotential heights are found for the period1973-2000. However, for the period 1949-1972 no significant... (More)
We investigate correlations between geomagnetic activity indices, theNorth Atlantic Oscillation (NAO), and stratospheric geopotentialheights. It is shown that the correlation between the geomagnetic indexAp and the NAO index is high and significant since about 1970, that itis significant during winter only, that it was not significant beforeabout 1970, and that the correlations are dominated by quasi-decadalscales of variability. Analysis of the spatial pattern of correlations,restricted to the Northern Hemisphere and wintertime, shows thatsignificant correlations between Ap and sea-level pressures and betweenAp and stratospheric geopotential heights are found for the period1973-2000. However, for the period 1949-1972 no significant correlationsare found at the surface while significant correlations still are foundin the stratosphere. This might indicate that a solar forcing, primarilyacting in the stratosphere, is propagating its influence downward in thelater period but not in the earlier. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Meteorology and Atmospheric Dynamics: Stratosphere/troposphere interactions, Global Change: Solar variability, Global Change: Climate dynamics (3309)
in
Geophysical Research Letters
volume
30
issue
6
pages
1 - 80
publisher
American Geophysical Union
external identifiers
  • scopus:0041689633
ISSN
1944-8007
DOI
10.1029/2002GL016598
language
English
LU publication?
no
id
98f5fce7-6c8d-479f-a509-b556d61a3d8e (old id 130561)
date added to LUP
2007-09-23 10:40:05
date last changed
2018-10-03 11:40:19
@article{98f5fce7-6c8d-479f-a509-b556d61a3d8e,
  abstract     = {We investigate correlations between geomagnetic activity indices, theNorth Atlantic Oscillation (NAO), and stratospheric geopotentialheights. It is shown that the correlation between the geomagnetic indexAp and the NAO index is high and significant since about 1970, that itis significant during winter only, that it was not significant beforeabout 1970, and that the correlations are dominated by quasi-decadalscales of variability. Analysis of the spatial pattern of correlations,restricted to the Northern Hemisphere and wintertime, shows thatsignificant correlations between Ap and sea-level pressures and betweenAp and stratospheric geopotential heights are found for the period1973-2000. However, for the period 1949-1972 no significant correlationsare found at the surface while significant correlations still are foundin the stratosphere. This might indicate that a solar forcing, primarilyacting in the stratosphere, is propagating its influence downward in thelater period but not in the earlier.},
  author       = {Thejll, Peter and Christiansen, Bo and Gleisner, Hans},
  issn         = {1944-8007},
  keyword      = {Meteorology and Atmospheric Dynamics: Stratosphere/troposphere interactions,Global Change: Solar variability,Global Change: Climate dynamics (3309)},
  language     = {eng},
  number       = {6},
  pages        = {1--80},
  publisher    = {American Geophysical Union},
  series       = {Geophysical Research Letters},
  title        = {On correlations between the North Atlantic Oscillation, geopotential heights, and geomagnetic activity},
  url          = {http://dx.doi.org/10.1029/2002GL016598},
  volume       = {30},
  year         = {2003},
}