# Turbulent diffusion coefficients in GLS scheme

**URL:** <https://nemo-ocean.discourse.group/t/turbulent-diffusion-coefficients-in-gls-scheme/514>\
**Category:** v4.2.x\
**Created:** [21 May 2023 16:41 UTC](https://nemo-ocean.discourse.group/t/turbulent-diffusion-coefficients-in-gls-scheme/514 "2023-05-21T16:41:04Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![qtqw](https://avatars.discourse-cdn.com/v4/letter/q/77aa72/32.png) [@qtqw](https://nemo-ocean.discourse.group/u/qtqw)\
**Post date:** [21 May 2023 16:41 UTC](https://nemo-ocean.discourse.group/t/turbulent-diffusion-coefficients-in-gls-scheme/514/1 "2023-05-21T16:41:04Z")

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I use GLS closure turbulent scheme.  
I found that in most cases turbulent diffusion coefficients (AVT and AVM) are 0 at lower model levels.  
As far as I understand,in GLS scheme if stratification is stable AVT and AVM should be small values but not 0.  
Am I rigth?

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**Author:** ![robinson](https://avatars.discourse-cdn.com/v4/letter/r/848f3c/32.png) [@robinson](https://nemo-ocean.discourse.group/u/robinson)\
**Post date:** [22 May 2023 06:25 UTC](https://nemo-ocean.discourse.group/t/turbulent-diffusion-coefficients-in-gls-scheme/514/2 "2023-05-22T06:25:17Z")

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Which is why there is a background diffusion/viscosity…