[MITgcm-support] MITgcm-support Digest, Vol 151, Issue 8

[weijianfen1988 at 163.com]

Dear Professor Menemenlis,

Thank you very much for your reply. I will read the paper of Nguyen first and try to adjust the parameters related to sea ice motion.

Thanks.
Jianfen



weijianfen1988 at 163.com
 
From: mitgcm-support-request
Date: 2016-01-13 01:00
To: mitgcm-support
Subject: MITgcm-support Digest, Vol 151, Issue 8
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   1. Re: MITgcm-support Digest, Vol 151, Issue 5
      (Menemenlis, Dimitris (329C))
 
 
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Message: 1
Date: Tue, 12 Jan 2016 02:50:28 +0000
From: "Menemenlis, Dimitris (329C)" <Dimitris.Menemenlis at jpl.nasa.gov>
To: MITgcm Support <mitgcm-support at mitgcm.org>
Subject: Re: [MITgcm-support] MITgcm-support Digest, Vol 151, Issue 5
Message-ID: <829AFFE4-6C47-4FD2-A4A0-345C33F24C4C at jpl.nasa.gov>
Content-Type: text/plain; charset="iso-8859-1"
 
There is several empirical model parameters (and boundary conditions) that need to be adjusted vs observations,
if you want your model to look like the observations.  And these parameters have different set of optimal values depending
on model configuration and boundary conditions.
 
One example adjustment of a small number of ice/ocean model parameters is:
http://ecco2.org/manuscripts/2011/NguyenJGR2011.pdf
In particular look at Figure 5b, which shows larger than observed
velocities prior to model parameer adjustment.
 
On Jan 11, 2016, at 5:58 AM, weijianfen1988 at 163.com<mailto:weijianfen1988 at 163.com> wrote:
 
Dear all,
 
I am trying to calculate the sea ice export through Fram Strait using daily ice concentration and ice velocity modelled by MITgcm. However, I found that the simulated sea ice motion is much stronger than satellite observations (data from NSIDC) in most areas of Arctic Ocean including Fram Strait, especially in summer. As a result, the averaged annual sea ice area export is also much higher than observations (about three times as that of observations). The ice-air and ice-ocean drag coefficients are set in 'data.seaice' as follows: SEAICE_drag=0.0012, SEAICE_waterDrag=5.5510.
 
I just want to know if anyone encounterd this problem before. What caused the overestimation of Arctic sea ice motion and how to improve the model results.
 
Thank you for your time.
 
Jianfen
 
 
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