[MITgcm-support] how to add river runoff in exf ?

[Martin Losch]

Dear Li zhi,

in global simulations, runoff is usually a field that is used in the same way as preciptation (in the absense of ice even identically). If you are using on-the-fly interpolation (#define USE_EXF_INTERPOLATION), you can, as with any other exf field, select to turn off interpolation (runoff_interpMethod=0 in data.exf) and use uninterpolated  fields that you have prepared. For runoff this is particularly interesting, as you may want to have the runoff in particular grid cells and not smeared out by some rough interpolation from a coarse grid.

In you regional set up with open boundaries, you could probably use obcs as an alternative to specify river inflow as a flux across an extra open boundary (point or a series of points), but that may be more tricky.

Martin
> On 19 Mar 2017, at 10:49, 李志远 <oceanlizy at 163.com> wrote:
> 
> From: Li zhi <oceanlizy at 163.com>
> To: MITgcm-support at mitgcm.org
> Subject: " how to add river runoff in exf"
> Dear all,
> 
>      I have used the MITgcm for three years. I setup a model in the East China Sea (in the northwestern Pacific Ocean) driven by the wind speed, air temperature, specific humidity, net short
> wave radiation, net long wave radiation and precipitation derived from the NCEP-NCAR. In winter, even though no river runoff is included as the driving force, the simulated results 
> 
> 
> (temperature, salinity, SSH and current) compare well with previous model results. This is due to the runoff flux is small in winter. However, in summer, the runoff flux from the 
> 
> Changjiang River is very large. Thus, the river runoff is crucial for the simulation of salinity in the East China Sea. Then, the problem arises! Few examples are foundabout how to 
> 
> add river runoff in the exf package. I have inquired some people around me about this question, but their advice seems not helpful. Could someone give some applicable advice here?
> 
> The figure attached below is the model domain and the Changjiang River is labeled.
> 
> Thank you so much!
> 
>  Li zhi
> 
> 
> 
> 
> 
> 
>  
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