Friday, May 25, 2012


date: Tue, 24 Apr 2001 12:46:05 +0100
from: Craig Wallace <>
subject: Fwd: RE: IJOC article
to: Tim Osborn <>


Here's what Igor has said to me about his ijoc article


>Date: Thu, 19 Apr 2001 13:52:05 -0300
>From: "Yashayaev, Igor" <>
>Subject: RE: IJOC article
>To: "'Craig Wallace'" <>
>Cc: "''" <>
>X-Mailer: Internet Mail Service (5.5.2650.21)
>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.
>-----Original Message-----
>From: Craig Wallace []
>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
>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.
> >

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