Effects on winter circulation of short and long term solar wind changes
- a Key Laboratory of Geographic Information Science, East China Normal University, China
- b University of Texas at Dallas, Richardson, TX, 75080, USA
- Day-to-day changes in the Arctic Oscillation and North Atlantic Oscillation correlate with relativistic electron precipitation, as do interannual changes.
- A connection via the global atmospheric electric circuit and cloud microphysical changes is suggested.
Indices of the North Atlantic Oscillation and the Arctic Oscillation show correlations on the day-to-day timescale with the solar wind speed (SWS). Minima in the indices were found on days of SWS minima during years of high stratospheric aerosol loading. The spatial distribution of surface pressure changes during 1963-2011 with day-to-day changes in SWS shows a pattern resembling the NAO. Such a pattern was noted for year-to-year variations by Boberg and Lundstedt (2002), who compared NAO variations with the geo-effective solar wind electric field (the monthly average SWS multiplied by the average southward component, i.e., negative Bz component, of the interplanetary magnetic field). The spatial distribution of the correlations of geopotential height changes in the troposphere and stratosphere with the SWS; the geoeffective electric field (SWS∗Bz); and the solar 10.7 cm flux suggests that solar wind inputs connected to the troposphere via the global electric circuit, together with solar ultraviolet irradiance acting on the stratosphere, affect regional atmospheric dynamics.
"solar wind inputs connected to the troposphere via the global electric circuit, together with solar ultraviolet irradiance acting on the stratosphere, affect regional atmospheric dynamics."ReplyDelete
UV only affects stratospheric temperatures (and thus regional atmospheric dynamics) by interacting directly with ozone on the way through.
I submit that the ozone chemistry effect is enough on its own to produce observed climate changes.
Of course other aspects of solar behaviour including the strength of the solar winds change at the same time but I am not aware of any mechanism whereby changes in such other variables can contribute to the observed climate consequences of solar variability.
The effect of more cosmic rays whilst plausible would not result in changes in stratospheric temperatures above the tropopause so the Svensmark hypothesis has difficulties.
There would be some ionization going on there, too.ReplyDelete
review of papers on solar correlation to European climateReplyDelete