[MITgcm-support] How to force river runoff data in a regional domain

[kunal madkaiker]

Thank you all for your suggestions.

Incase I go with option 3, my question is, do I have to select grid points
for runoff in X or Y (1D) direction, or can they be 2D (XZ or YZ)? If 2D,
then how can I force them through data.obcs.

Regards,
Kunal

On Thu, Jul 29, 2021 at 10:25 AM Stanislav Martyanov <martyanov.sd at gmail.com>
wrote:

> Hello, Kunal,
>
> I use option #1 (#define ALLOW_RUNOFF, and corresponding settings in
> data.ext) for the Kara Sea regional domain, and it works fine. The spatial
> resolution is also rather high: O(1 km) in horizontal and 2m in vertical.
> Simulation of thermohaline structure near river estuaries and getting
> realistic river plumes (at least as much as the resolution allows) also
> sometimes requires knowing the temperature of riverine waters, which often
> is not available. As I remember, by default MITgcm takes the local water
> temperature as the input river water's temperature, but in reality it is
> not always the case.
>
> Regards,
> Stanislav Martyanov
>
> ср, 28 июл. 2021 г. в 13:10, kunal madkaiker <kunal.madkaiker02 at gmail.com
> >:
>
>> Dear MITgcm users,
>>
>> I am doing regional simulations in the Northern Indian Ocean.
>> Stratification in Bay of Bengal is controlled by salinity and freshwater
>> flux since many rivers like Ganges, Brahmaputra empty into this basin.
>>
>> I am not able to properly simulate my temp, salinity and currents into
>> the Head bay region of BoB as I am unable to produce an equatorward flow in
>> my domain. Freshwater increases in this region during month of JJAS due to
>> melting of Himalayan glaciers.
>>
>> I have gone through previously asked similar questions about river runoff
>> and came to know the following possibilities:
>>
>> 1. To feed at surface through data.exf
>>
>> 2. Feeding a 3-D run-off input using addMassFile
>>
>> 3. Through OBCS/ RBCS.
>>
>> My domain is regional, with small dz and high spatial resolution.
>> Please let me know which option is the best suited and reliable, since I
>> not only want to improve my temp/ salinity but also to rectify the
>> circulation in head bay region. I would be using Dai et al. (2009) river
>> runoff data.
>> All suggestions are welcome. Attaching figure of my model domain.
>>
>> Thanks and Regards,
>> Kunal
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