date: Tue Jun  8 11:49:00 2004
from: Tim Osborn <t.osborn@uea.ac.uk>
subject: Fwd: (no subject)
to: "Keith Briffa" <k.briffa@uea.ac.uk>

     Date: Thu, 03 Jun 2004 13:55:54 +0200
     From: Eduardo Zorita <Eduardo.Zorita@gkss.de>
     Subject: (no subject)
     Sender: Eduardo.Zorita@gkss.de
     To: simon.tett@metoffice.com, t.osborn@uea.ac.uk, fidelgr@fis.ucm.es
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     Simon, Tim, Fidel
     yes, this is exactly what the plot in my last email represented
     >Hi Eduardo,
       >      can you give a sharper defn of what you mean. i.e. is it JJA -
     DJF for
     l>and north of the equator?
     >I'd guess that as solar insolation increases that summer warms faster
     >than winter so the seasonal cycle increases with time.
     Well, this seems reasonable, but by looking at  the attached plot, one
     would perhaps reach the opposite conclusion. It is derived from the NCEP
     reanalysis and represents also the difference JJA minus DJF over land
     areas north of
     the equator, together with the total solar irradiance anomalies.
     If one believes that the oscillations in the  amplitude of the annual
     cycle are related
     to the TSI, then they are anticorrelated, although the amplitude of the
     oscillations seems to become smaller in the most recent decades.
     eduardo
