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Box model for handling of flows in course, km-scale models

asked 2022-08-30 11:09:05 +0200

Hi All,

This is a very high-level question, but I'm wondering specifically whether anyone has coded offline, or in the gitlab environment, the addition of some sort of box-model capability for handling freshwater inputs into estuaries and bays to accurately model temperature and salinity in the river plume that enters a coarser model domain?

I found from a brief web search that CMCC have developed a box model that is compatible with NEMO, see here: https://www.sciencedirect.com/science...

I am interested in this aspect, mainly because the crocotools scripts for river runoff from Dai and Trenberth attributes river temperature and salinity with WOA monthly climatology values on the shelf. In realistic non-climatology runs, this will always lead to inaccurate attribution of T/S from rivers as so much mixing takes place where the river meets the ocean.

I have high resolution (daily) flow data from all rivers entering my model domain, and I also have monthly temperature data. I could assume a salinity of zero but this is not appropriate or a reflection of reality when the river is presented as a point on the coastal shelf.

This point equally applies to nutrient inputs from large rivers, which may be assimilated for growth during favourable conditions in estuaries, bays and harbours.

It could be great to get feedback from this post and any advice in relation to handling of real river data.

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answered 2022-09-02 14:36:26 +0200

andres gravatar image

Hi,

Do you want a more realistic croco_runoff.nc file, or a way to get river input values depending on the T,S,U,V,zeta of the point source discharge cell?

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Hi, I'm looking to get an accurate salinity and temperature value, given that I have accurate flow data for the rivers. In the paper I included a link to, the box model derives a completely mixed salinity value for the discharge from estuaries/bays. It also proposes a different flow value.

jmcgovern gravatar imagejmcgovern ( 2022-09-05 11:30:41 +0200 )edit

You can write your realistic time series of daily or hourly flow, temperature and salinity values directly into the croco_runoff.nc file. As long as it has the correct range of time values, CROCO will read it. They have to be calculated offline. Do you want them to depend on the model state?

andres gravatar imageandres ( 2022-09-05 14:59:16 +0200 )edit

My concern is related to the positioning of the runoff point in the IJ plane. It must be adjacent to the coast, but realistically, if I apply a salinity of 0 psu at that point, it doesn't reflect the salinity conditions there. Due to mixing, by the time the river meets that grid point....

jmcgovern gravatar imagejmcgovern ( 2022-09-05 15:33:57 +0200 )edit

...the plume has a very different characteristic, in both T and S. I want to attribute realistic T/S and volumes of net outflow at the coastal grid point which is meant to be a proxy for the river discharge to an estuary, which may be semi-enclosed for example....

jmcgovern gravatar imagejmcgovern ( 2022-09-05 15:36:50 +0200 )edit

...Perhaps this question is more theoretical in nature. I can always proceed on the basis of attributing the monthly observed **river** temperature to the runoff, and 0 psu for salinity.

jmcgovern gravatar imagejmcgovern ( 2022-09-05 15:37:50 +0200 )edit
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Asked: 2022-08-30 11:09:05 +0200

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Last updated: Sep 02