Introducing positive-definite TVD schemes for improved PBL and convective tracer transport

[rmontuoro]

Description

Positive-definite Total Variation Diminishing (TVD) mass-flux schemes have been developed at NOAA/EMC to improve tracer transport in PBL and cumulus convective parameterizations. The advantage of TVD schemes is that they don't generate negative values for tracer mixing ratios, as occurs with current FV3 schemes, contributing to tracer mass conservation.

CCPP-compliant TVD implementations for TKE-EDMF turbulent mixing and SAMF convective schemes are been tested and will be provided shortly.

Further details are provided in this document.

Author: Jongil Han, NOAA/EMC

[lharris4]

"as occurs with current FV3 schemes" Please note that all advection in FV3 is monotone or positive definite and so does not create any negatives.

[climbfuji]

"as occurs with current FV3 schemes" Please note that all advection in FV3 is monotone or positive definite and so does not create any negatives.

I think the correct wording would have been "as occurs in the current GFS v16 physics in CCPP"

[yangfanglin]

Lucas,
Thanks for confirming. Indeed we only found sources of negative tracers from the physics.

[lharris4]

OK. Thanks :-)

…

On Wed, Nov 10, 2021 at 12:14 PM Dom Heinzeller ***@***.***> wrote: "as occurs with current FV3 schemes" Please note that all advection in FV3 is monotone or positive definite and so does not create any negatives. I think the correct wording would have been "as occurs in the current GFS v16 physics in CCPP" — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#753 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AMUQRVFMF34DL7CL5WIWNQLULKR7DANCNFSM5FNDEONQ> . Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>.

[lharris4]

Hi, Fanglin. Thanks for checking :-) Lucas

…

On Wed, Nov 10, 2021 at 12:15 PM Fanglin Yang ***@***.***> wrote: Lucas, Thanks for confirming. Indeed we only found sources of negative tracers from the physics. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#753 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AMUQRVB5BAPYPLELOT6HJXLULKSEJANCNFSM5FNDEONQ> . Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>.