Documentation of processes included in GOFS 3.1 Reanalysis (expt 53.X)

Victor Onink

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Jan 15, 2020, 12:42:53 PM1/15/20

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Hello everyone,

I have been doing some simulations using surface circulation data downloaded from the GOFS 3.1 global reanalysis. However, I have been looking for a documentation that describes what processes are included in the reanalysis experiment (expt 53.X). Where can I find this? Specifically I would like to know whether tides are included within the reanalysis or not but for future questions I'd like to know where I can find such information (since I was not able to find an answer on the documentation page on the HYCOM website).

Thanks,

Victor

Sam Kastner

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Nov 2, 2023, 12:56:03 PM11/2/23

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Hi all,

I am also interested in the answer to this question (resurrecting this thread!). Specifically, I'm wondering about the friction/bottom stress formulation included in this run. Are the tensor formulations laid out here: https://www.hycom.org/attachments/079_2_Arbic.pdf included?

Thanks,

Sam

Alan Wallcraft

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Nov 2, 2023, 2:06:43 PM11/2/23

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None of our global products include tides. So they don't include tidal drag. They do have quadratic bottom friction.

Alan.

Sam Kastner

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Nov 2, 2023, 2:11:30 PM11/2/23

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Thanks. Is the quadratic bottom fraction coefficient C_d=2.5x10^-3?

Alan Wallcraft

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Nov 3, 2023, 7:53:05 AM11/3/23

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It is 2.5e-3 in deep water increasing to 7.5e-3 in very shallow water. See https://groups.google.com/a/hycom.org/g/forum/c/ktcP7sjI9IQ/m/DWaG0qZjAQAJ

Alan.

Sam Kastner

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Nov 5, 2023, 9:56:20 AM11/5/23

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Thanks, Alan, that's really helpful.

Is it possible to have a .nc file of the spatially variable drag used in 53.X? Or a similar map as the one in that post of the bottom drag coefficient for the Caribbean?

-SK

Alan Wallcraft

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Nov 5, 2023, 2:35:14 PM11/5/23

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I see that the maximum is about 0.005 in 5m of water:

COAPS 1408> cat cb_11_10mm.b
CB - min, max = 2.49999994E-03 5.24821924E-03

Download cb_11_10mm.nc

Alan.

Sam Kastner

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Nov 5, 2023, 10:10:27 PM11/5/23

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Thanks, Alan! This is perfect. Really unnecessary to do this on a Sunday, but I appreciate it. Have a good week.

-Sam

On Nov 5, 2023, at 11:35 AM, Alan Wallcraft <alan.wa...@hycom.org> wrote:

I see that the maximum is about 0.005 in 5m of water:

COAPS 1408> cat cb_11_10mm.b
CB - min, max = 2.49999994E-03 5.24821924E-03

<botfric_010mm_100m.gif>

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