date: Tue, 24 Apr 2001 12:46:05 +0100 from: Craig Wallace subject: Fwd: RE: IJOC article to: Tim Osborn Tim Here's what Igor has said to me about his ijoc article Craig >Date: Thu, 19 Apr 2001 13:52:05 -0300 >From: "Yashayaev, Igor" >Subject: RE: IJOC article >To: "'Craig Wallace'" >Cc: "'igorz@sail.msk.ru'" >X-Mailer: Internet Mail Service (5.5.2650.21) > >Craig, >What you have said is very interesting for us, because as an extension of >the study of regular annual cycle we were going to look in the interannual >variations of annual and semiannual amplitudes and phases. I also hoped to >correlate it with interannual changes of salinity and density as well as >other modulators stratification in the North Atlantic particularly in the >shelf areas. >What complicates the study of interannual modulation is methodology: 5 >degrees of freedom in biharmonic case would require at least 60 points to >get a good quantification of interannual changes. I tried to compensate this >by normalizing data in a spatial domain with a similar regular annual >cycle, but did this only in selected areas. Idea was to build a systematic >approach for mapping interannual variability. > >From your website I found that your are on a similar track. >There are also attempts to use other than harmonic methods to reveal >interannual modulations of the seasonal cycle, but I am personally in favour >of harmonic (it's more natural and easier to interpret). >I would welcome any further discussion on this matter. >Cheers. >Igor. > > > >-----Original Message----- >From: Craig Wallace [mailto:craig.wallace@uea.ac.uk] >Sent: April 19, 2001 12:31 PM >To: Yashayaev, Igor >Subject: RE: IJOC article > > >Dear Igor > >Thanks for the pdf file. I am researching the annual cycle of temperature >for my PhD. This incorporates both ocean air temperature and land surface >air temperature, and has started by extending the work done by Mann and >Park in a 1996 paper (I plan to submit this work shortly to Climate >Research). Part of this work examines the observed annual cycle >climatology, but I am also interested in changes to the annual harmonic >through time, and how these observed changes compare with model out put >data (especially, the United Kingdom HadCM2 couple ocean-atmosphere model). >Changes to the amplitude of the harmonic are comparable (between >simulations and observations). Phase changes are a different story, and >need a little more attention! Incidentally, HadCM2 is a flux-corrected >model.....changes over the oceans are constrained to prevent the climate >state drifting too far from reality. I plan in the future to examine >changes in HadCM3, which is a non-flux-corrected model, and compare the >performance over oceans. > >To date though, I have only examined the annual cycle in the first >harmonic, limiting my studies to extra-tropical regions. To complete the >research, I intend to involve at least the second harmonic, which should >represent most parts of the globe. > >I look forward to reading your paper-it looks very interesting. > >Best wishes > >Craig > >http://www.cru.uea.ac.uk > > > > >At 11:27 AM 4/19/01 -0300, you wrote: > >Dear Craig, > >If your current study is related to the oceanic climate and its changes, we > >will be very glad to hear about it. > >Thanks. > >Igor. > >