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Re: replace integration by summation [message #84913 is a reply to message #84910]

Tue, 18 June 2013 09:42

Fabzi
Messages: 305
Registered: July 2010

Senior Member

Hi everyone,

On 06/18/2013 06:17 PM, Phillip Bitzer wrote:
> The best routine to use depends how the data varies. What is "wrong"
with the answers?

I will ruthlessly use this thread to ask my question to the atmospheric
modellers in the IDL community out here. I am also secretly asking
myself how many atmospheric modellers are reading this group ;-)

I am vertically integrating a quantity from an atmospheric model output
(in this case: moisture flux) over the atmospheric column. I made some
searches and it came out that some people use trapezoidal rule for this,
some use the midpoint approximation rectangle rule
(http://en.wikipedia.org/wiki/Rectangle_method). There aren't many more
options because the data is tabulated (z-coordinates=pressure,
values=flux).
To me, the rectangle rule makes more sense from the "gridded point of
view" of atmospheric models. Does anyone have a hint or a good reference
explaining how this should be "correctly done" in this case? Thanks!

Fab

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[Message index]

		replace integration by summation By: fd_luni on Tue, 18 June 2013 03:36
		Re: replace integration by summation By: Helder Marchetto on Tue, 18 June 2013 03:56
		Re: replace integration by summation By: fd_luni on Tue, 18 June 2013 07:13
		Re: replace integration by summation By: Craig Markwardt on Tue, 18 June 2013 09:04
		Re: replace integration by summation By: Phillip Bitzer on Tue, 18 June 2013 09:17
		Re: replace integration by summation By: David Fanning on Tue, 18 June 2013 09:37
		Re: replace integration by summation By: Phillip Bitzer on Tue, 18 June 2013 11:46
		Re: replace integration by summation By: David Fanning on Tue, 18 June 2013 11:56
		Re: replace integration by summation By: David Fanning on Tue, 18 June 2013 11:59
		Re: replace integration by summation By: fd_luni on Wed, 19 June 2013 02:01
		Re: replace integration by summation By: Paul Van Delst[1] on Wed, 19 June 2013 05:08
		Re: replace integration by summation By: fd_luni on Wed, 19 June 2013 05:55
		Re: replace integration by summation By: Mats Löfdahl on Wed, 19 June 2013 06:02
		Re: replace integration by summation By: fd_luni on Wed, 19 June 2013 06:09
		Re: replace integration by summation By: Craig Markwardt on Wed, 19 June 2013 09:29
		Re: replace integration by summation By: fd_luni on Wed, 19 June 2013 13:05
		Re: replace integration by summation By: Phillip Bitzer on Wed, 19 June 2013 14:04
		Re: replace integration by summation By: Paul Van Delst[1] on Wed, 19 June 2013 14:20
		Re: replace integration by summation By: Craig Markwardt on Wed, 19 June 2013 21:06
		Re: replace integration by summation By: fd_luni on Thu, 20 June 2013 03:12
		Re: replace integration by summation By: fd_luni on Thu, 20 June 2013 04:10
		Re: replace integration by summation By: Phillip Bitzer on Thu, 20 June 2013 09:28
		Re: replace integration by summation By: Paul Van Delst[1] on Thu, 20 June 2013 07:11
		Re: replace integration by summation By: Fabzi on Tue, 18 June 2013 09:42
		Re: replace integration by summation By: Phillip Bitzer on Tue, 18 June 2013 11:47

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