Thursday, December 29, 2011


From: Kevin Trenberth <>
To: Grant Foster <>
Subject: Re: ENSO blamed over warming - paper in JGR
Date: Mon, 03 Aug 2009 11:34:59 -0600
Cc:, "J. Salinger" <>, James Annan <>,, Mike Mann <>, Gavin Schmidt <>,

Hi Grant,
I have been tied up with other things. In looking at the paper some questions.
1) In Fig 1, why is the scale zero to 2? Normally a filter would be scaled to have a
response function zero to 1.
2) In Fig 2 and 3 what are the units of "power"? It is not in the caption. Are these
normalized spectra so that the area under the curve is unity? My guess is that this is the
case and hence the amplification at ENSO bands. But it is important to say this and
perhaps point out. Maybe the captions are sufficient? Add something like: The spectra
have been normalized to have unit variance, which relatively inflates the values in the 0.2
to 0.5 frequency band. In a couple of places in text add "normalized" before "power
spectrum" such as 2 lines above Fig 3 in the JGR set version.
3) A minor point: in the x= sin(2*pi*vt) I would be inclined to add an amplitude which
would then be included also in eq (1) on RHS emphasizing how the amplitude is changed.
[My own preference would be to call the amplitude A and the A you have R (for response
function)]. However it is fine as is.
Grant Foster wrote:

Well, I got some free time and it didn't take as long as I expected. Attached are: Comment in preprint form Comment in draft form (for submission) Comment NOT as preprint or draft, with larger font and double-wide graphs
I suggest we don't circulate it until folks have had one further day to check. And
double check and triple-check. If we don't hear an objection by tomorrow morning, I
suggest we submit it to JGR and feel free to circulate it.
So -- this is your last chance to suggest changes before submission, or to suggest
restraint in circulation.

Windows Live(TM): Keep your life in sync. [1]Check it out.

Kevin E. Trenberth e-mail: [2]
Climate Analysis Section, [3]
P. O. Box 3000, (303) 497 1318
Boulder, CO 80307 (303) 497 1333 (fax)

Street address: 1850 Table Mesa Drive, Boulder, CO 80305



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