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

[Stanislav Martyanov]

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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