[ecco-support] [EXTERNAL] ECCO V4r4: Components of TFLUX

[Wang, Ou (US 329B)]

Hello Emily,

For ECCO V4r4, it is possible to estimate TFLUX using monthly averaged fields. Below is a brief description about how to do it. An example of Jupyter notebook is attached for your reference.

TFLUX = (EXFhs + EXFhl - EXFlwnet - EXFswnet + (TFLUX - oceQnet)) * (1-SIarea) + Other

- TFLUX: Rate of change of ocean heat content per m2 accounting for mass fluxes, >0 increase THETA
- EXFhs: Open ocean air-sea sensible heat flux, >0 increases THETA
- EXFhl: Open ocean air-sea latent heat flux, >0 increases THETA
- EXFlwnet: Net open ocean longwave radiative flux, >0 decreases THETA
- EXFswnet: Net open ocean shortwave radiative flux, >0 decreases THETA
- (TFLUX - oceQnet): Implied heat flux due to added mass, >0 increases THETA
- SIarea: Sea-ice concentration
- Other = (turbulent + conductive fluxes between ocean and sea-ice + penetrative shortwave flux thru sea-ice and residual due to using values averaged over a period longer than one time step). ECCO V4r4 does not save the terms on the right-hand side separately.

All terms except for SIarea (dimensionless) are in Wm-2.

Although it depends what time scales you are interested in, using monthly averages for the estimate is a good approximation. We may lose some precision along ice edges. Using daily means would likely help.

Best,
Ou Wang

From: ecco-support <ecco-support-bounces at mit.edu> on behalf of Emily E. Hayden <haydenem at oregonstate.edu>
Date: Thursday, September 29, 2022 at 5:32 AM
To: ecco-support at mit.edu <ecco-support at mit.edu>
Subject: [EXTERNAL] [ecco-support] ECCO V4r4: Components of TFLUX
Good afternoon,

I am working with ECCO to compute a mixed layer heat budget and its anomalies in the subpolar North Pacific, and I would like to assess what component of the total heat flux drives the majority of the observed surface forcing anomalies.

To do this, I would like to access each term that contributes to TFLUX. At this point, I believe I need EXFlh, EXFsh, EXFswnet, EXFlwnet, and oceFWflux; however, I am unsure if this covers all of the components. In particular, I think I still need the turbulent and conductive fluxes between the ocean and sea-ice/snow, but I am having trouble determining what these fields are called in the ECCO output files.

Is it possible to estimate TFLUX using monthly averaged fields of its components? If so, what fields do I need to do so?

Thank you!

Best,
--------
Emily E. Hayden
Ph.D. Student | College of Earth, Ocean, and Atmospheric Sciences
National Defense Science and Engineering Graduate Fellow
haydenem at oregonstate.edu<mailto:haydenem at oregonstate.edu>






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