[ecco-support] [EXTERNAL] Concern Regarding Closure of Heat and Freshwater Flux for ECCOV4R4

[Wang, Ou (US 329B)]

Hello Justin,

The answers to your first two questions are yes, both ‘EXFqnet’ and ‘EXFempmr’ can be closed only by these components you listed in your email. There are no other flux components to close EXFqnet’ and ‘EXFempmr’. I wonder if you might miss the minus sign in some of the components in your calculation. The exact equations to close ‘EXFqnet’ and ‘EXFempmr’ are as follows. Also, see my answer to your third question below.

1) EXFqnet = -EXFhs -EXFhl + EXFlwnet + EXFswnet
2) EXFempmr = EXFevap - EXFpreci - EXFroff
3) There are no documentation that exactly differentiates ice-covered and ice-free grid points at each time step. However, you can use the daily-mean SIarea to differentiate ice-covered and ice-free grid points on daily mean basis.

Best,
Ou Wang

From: ecco-support <ecco-support-bounces at mit.edu> on behalf of Justin Campbell <campbelljustin989 at gmail.com>
Date: Thursday, March 23, 2023 at 12:38 PM
To: ecco-support at mit.edu <ecco-support at mit.edu>
Cc: Heimbach, Patrick <heimbach at oden.utexas.edu>
Subject: [EXTERNAL] [ecco-support] Concern Regarding Closure of Heat and Freshwater Flux for ECCOV4R4
Hello,


My name is Justin Campbell; I am a research engineering assistant working under Patrick Heimbach on a data analysis project using ECCOv4r4 datasets from the ECCO Drive. There are a few questions that I have with regards to the datasets that close the heat and freshwater flux budgets for the ocean surface:

1) In developing a residual plot of the net heat flux through the ocean surface from sea-ice-ocean-surface transfer (in areas with ice cover) and from atmosphere-ocean-surface transfer (in areas without ice cover) it appears the dataset, 'EXFqnet', is not closed by taking the sum of the datasets:  'EXFlwnet', 'EXFswnet', 'EXFhl', and 'EXFhs'. Are there any datasets that I am missing here?

2) Similarly, in developing a residual plot of the net freshwater flux through the ocean surface, can I be provided with a confirmation as to whether or not the dataset, 'EXFempmr' is closed by taking the sum of the datasets: 'EXFroff', 'EXFevap', and 'EXFpreci'?

3) Lastly, is there documentation available that differentiates individual grid points in these datasets that correspond to areas with ice cover from those that do not over time? I would like to be able to use this distinction in my analysis.


Best Regards,



Justin Campbell
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.mit.edu/pipermail/ecco-support/attachments/20230323/a884fb8f/attachment-0001.htm>