date: Tue Jun 8 11:49:00 2004 from: Tim Osborn subject: Fwd: (no subject) to: "Keith Briffa" Date: Thu, 03 Jun 2004 13:55:54 +0200 From: Eduardo Zorita Subject: (no subject) Sender: Eduardo.Zorita@gkss.de To: simon.tett@metoffice.com, t.osborn@uea.ac.uk, fidelgr@fis.ucm.es X-Mailer: Mozilla 4.79 [en] (X11; U; SunOS 5.9 sun4u) X-Accept-Language: en X-UEA-MailScanner-Information: Please contact the ISP for more information X-UEA-MailScanner: Found to be clean 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