[ecco-support] [EXTERNAL] Questions about salinity budget using ECCO near real-time data (dr080)

[Wang, Ou (US 329B)]

Hi Zongheng,

The gsExtave field (in psu s^-1) is salinity tendency due to evaporation minus precipitation. To convert gsExtave to virtual salt flux in psu m s^-1, use the follow equation
Virtual salt flux (in psu m s^-1) =  gsExtave  * 10
where 10 is the thickness of the first model layer in meters.

To convert gsExtave to freshwater flux in m s^-1, use
Freshwater flux (m s^-1) = -gsExtave  * 10 / 35
where 10 again is the thickness of the first model layer in meters and 35 (psu) is the reference salinity.

The magnitude of freshwater flux converted from gsExtave using the equation above is in the order of 1e-7 m s^-1, which seems right.

I will make the advection tendencies in gradient form available in a couple of weeks.

Best,
Ou

From: <ecco-support-bounces at mit.edu> on behalf of "lzh6939 at stu.ouc.edu.cn" <lzh6939 at stu.ouc.edu.cn>
Reply-To: "ECCO support list, wider membership" <ecco-support at mit.edu>
Date: Wednesday, November 10, 2021 at 7:44 PM
To: "ecco-support at mit.edu" <ecco-support at mit.edu>
Subject: [EXTERNAL] [ecco-support] Questions about salinity budget using ECCO near real-time data (dr080)

Dear ECCO team,
I am attempting to use ECCO near real-time data (dr080) to study salinity budget. However, there are some problems in calculation:
1. I try to use the sum of gsExtave and gsRelaxave to represent the surface forcing [(E-P)·S / h], but the result is obviously larger than that calculated from the observations. Could you please show me how to calculate the surface forcing?
2. I find in the Readme file that the advection tendencies in gradient form (udS/dx) can be obtained in a separate directory (NON_MOTO), but I didn't find this directory. Can you tell me how to obtain the advection tendencies in gradient form?
Thank you for your kind consideration of this request. Looking forward to your reply.
Sincerely,
Zongheng Li

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