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ESCOMP / CTSM

Community Terrestrial Systems Model (includes the Community Land Model of CESM)
http://www.cesm.ucar.edu/models/cesm2.0/land/
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Add new dust emission scheme #1230

Closed L3atm closed 1 year ago

L3atm commented 3 years ago

We propose to add a new dust emission scheme improving the dust mobilization parameterizations in CESM2. We also propose to add a namelist entry and switches in the code, such that CESM2 users could turn on and off this new dust emission scheme easily. These will imply changes in the following files:

Brief science information: The physically-based new dust emission scheme produces a statistically significant improvement in the representation of dust emission compared to the default scheme used in the current CESM2. This new dust emission scheme also reduces the need to use an empirical source function in the dust cycle simulation to shift emissions toward the word's most erodible regions.

Pseudocode for all file changes:

Long term goal: To add the suggested feature to the master branch of CESM2.

wwieder commented 3 years ago

@L3atm thanks for filing this issue and letting is know about this plan. We look forward to hearing more about your work. Out of curiosity, who are you & where do you work? It's helpful on our end to be able to talk about the people who are making the science of CTSM happen.

L3atm commented 3 years ago

@wwieder Hi! Nice to meet you here. This is Longlei Li, a postdoc working with Natalie Mahowald at Cornell. We look forward to working with you on this too.

wwieder commented 3 years ago

awesome. Thanks Longlei. Good to meet you too. How mature is this work? Do you see yourself submitting a pull request soon, or is it just getting started? Regardless, keep us up to date on your progress. Best, Will

On Wed, Dec 16, 2020 at 7:31 AM L3atm notifications@github.com wrote:

@wwieder https://github.com/wwieder Hi! Nice to meet you here. This is Longlei Li, a postdoc working with Natalie Mahowald at Cornell. We look forward to working with you on this too.

— You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub https://github.com/ESCOMP/CTSM/issues/1230#issuecomment-746381477, or unsubscribe https://github.com/notifications/unsubscribe-auth/AB5IWJCZL6WJHDNZZI6HQR3SVDAC5ANCNFSM4U5MDIQQ .

L3atm commented 3 years ago

Hi Will!
Thanks for the question. I think I will submit a pull request soon, and will keep you up to date!
Best regards, Longlei

wwieder commented 3 years ago

Hello, any updates on this issue? Is it still an active project?

lkemmons commented 2 years ago

Longlei @L3atm and Will @wwieder, It would be helpful to coordinate this development with the implementation of MAM5 that Francis @fvitt is working on in https://github.com/ESCOMP/CAM/pull/445 It would be good to create a new compset with the new dust emissions and MAM5, and not work on tuning each of these separately.

wwieder commented 2 years ago

I think this makes sense. @ekluzek typically makes compsets for CTSM. Erik is there anyone else on the land side that should be involved in this conversation?

It would help me to know about the timing of when the new dust scheme will be ready, when MAM5 will be ready, and when you'd like the compset @lkemmons ? My Friday most weeks is relatively open and my calendar is up to date if you want to try and schedule something.

wwieder commented 2 years ago

I'm also imagining that the modifications @L3atm started making in 2020 will need to be brought up to a current CTSM tag before we can merge. I don't expect too many conflicts with this, but wanted to highlight this priority may be needed before making a compset?

lkemmons commented 2 years ago

I think we need to hear from Longlei about the status of the dust. Francis has the MAM5 code and may be able to work on it soon. A compset would be made after both those steps. We think it would be valuable to have the compset for use in testing in the "workhorse" model development, but no specific deadline.

On Wed, Oct 27, 2021 at 5:33 PM will wieder @.***> wrote:

I'm also imagining that the modifications @L3atm https://github.com/L3atm started making in 2020 will need to be brought up to a current CTSM tag before we can merge. I don't expect too many conflicts with this, but wanted to highlight this priority may be needed before making a compset?

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L3atm commented 2 years ago

Hello! What Louisa proposed makes sense to me too. The current modifications I have made are in CTSM part only. Modifications to CAM are also required and have not yet been done. We may need to coordinate with the CAM chemistry group on how to get those modifications into CAM. I will create a branch next in CAM soon. As a side note, we have recently revised the threshold soil moisture calculation in the land model in order to turn the soil moisture effect on. This change will be included here too.

lkemmons commented 2 years ago

It sounds like the dust code needs to be moved to current CTSM code. Who will be able to do that? Francis will be putting the MAM5 code into current CAM code soon. Would it be helpful to meet to discuss the next steps?

On Thu, Oct 28, 2021 at 9:12 AM Longlei Li @.***> wrote:

Hello! What Louisa proposed makes sense to me too. The current modifications I have made are in CTSM part only. Modifications to CAM are also required and have not yet been done. We may need to coordinate with the CAM chemistry group on how to get those modifications into CAM. I will create a branch next in CAM soon. As a side note, we have recently revised the threshold soil moisture calculation in the land model in order to turn the soil moisture effect on. This change will be included here too.

— You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub https://github.com/ESCOMP/CTSM/issues/1230#issuecomment-953943038, or unsubscribe https://github.com/notifications/unsubscribe-auth/AH5BH7LHB5XXVK5J35U75V3UJFR6XANCNFSM4U5MDIQQ . 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.

ekluzek commented 2 years ago

@lkemmons yes it sounds like we need to get the group together to talk about how to move forward with this. @wwieder should be part of the discussion so he can talk about who can work on it here in CESM. Can you propose a meeting?

wwieder commented 2 years ago

From our call today:

We decided NOT to maintain backwards compatibility with the old dust scheme, which will be available in CESM2.1. Natalie said this new dust scheme is much better and should just replace the old (dated) dust scheme for CESM2.3 and beyond.

lkemmons commented 2 years ago

The CAM climate tuning can be done with the new dust scheme and MAM5 (5-mode Modal Aerosol Model), which will have a different coarse mode size for dust than MAM4.

ekluzek commented 1 year ago

I'm closing this because we decided to go with #1604 which is based on this work, but adds some additional improvements to it. We also decided we didn't need to support this solution in addition to it.