[MITgcm-support] Ocean currents veering due to bathymetry

[Matthew Mazloff]

1) You are setting U and V = 0 as an initial condition? Then likely U and V aren’t spun up yet after just 10 days. 

2) regional models are very sensitive to obcs. You aren’t prescribing a UVTS on the boundary? That will kill your coastal currents. 

Sounds like the problems are just with your (lack of) inputs

Matt
 

> On Jul 23, 2020, at 9:22 PM, kunal madkaiker <kunal.madkaiker02 at gmail.com> wrote:
> 
> Dear MITgcm users,
> 
> I am trying to simulate ocean currents along the West coast of India in a high resolution grid (360x780) for the month of September. For now, I am providing monthly climatology of August Temperature and Salinity as initial forcing along with September zonal and meridional wind stress. Currently, using the Orlanski scheme for obcs and no boundary forcings. Model is simulated for 10 days.
> 
> But the currents are not coming correct. The West Indian Coastal Current (WICC) which flows equatorward (during Sept) isn't being captured at all. After plotting the bathymetry, I observed that the currents are being veered northward by the Arabian sea continental shelf (Please refer to Picture1.png attached (Day 04-10)). Is that possible? My bathymetry bin file is just a 2D mesh with depth values. Also, my coastal currents are very weak.
> 
> Attaching my data,data.obcs and data.exf file. Please let me know if any additional information is required from my end.
> Kindly advise. All suggestions are welcomed.
> 
> Regards
> Kunal
> <data.obcs><bathymetry.png><data><data.exf><Picture1.png>_______________________________________________
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