[MITgcm-support] Baroclinic tides in MITgcm

[Matthew Mazloff]

The barotropic tidal amplitude should not be damped by an order of magnitude in the interior of your domain. I would make sure you are prescribing the barotropic tide correctly compared to TPXO before worrying that this is due to compensation by baroclinic tides. Or maybe I am not understanding your question… Are you intending to force with TPXO barotropic tides, but finding the barotropic tide too weak?

Matt

> On Sep 5, 2019, at 1:31 PM, Ruan Xiaozhou <saberruan at hotmail.com> wrote:
> 
> Dear all,
> 
> I’m currently forcing a nested patch with 4 open boundaries. I use realistic atmospheric forcing and also T/S/U/V from reanalysis datasets. However, when I compare the near-bottom tidal flow in my output with mooring observations, the simulated tidal flow is almost an order of magnitude smaller. I think this is due to baroclinic tidal signal since the tidal amplitude from TPXO is already an order of magnitude smaller (both at the open boundaries in my model and at the point of comparison in TPXO). I was wondering if anyone had similar issues before? I’m using bottomDragQuadratic=0.002 and a uniform dz = 10m which should be high enough to resolve all the baroclinic modes. Thanks in advance for your help!
> 
> Best,
> Xiaozhou
> 
> --
> Xiaozhou Ruan
> Postdoctoral researcher
> Department of Earth, Atmospheric and Planetary Sciences
> Massachusetts Institute of Technology
> 54-1622
> Cambridge, MA  02139
> 
> email: xruan at mit.edu <mailto:xruan at mit.edu>
> web:   http://www.mit.edu/~xruan
> 
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