[Liwg-core] report on new BG/JG: TOPOGRAPHY NOT UPDATED

Jeremy Fyke fykej at ae.ca
Fri Dec 14 10:09:37 MST 2018


Hey guys,

Thanks Kate/Miren/Marcus/all.  Ya I agree with Marcus.  Moving forward, as long as it can be confirmed that the topography is updating itself 1x at start of each BG* iteration from here on out then we should be all good.

jer

From: Miren Vizcaino [mailto:M.Vizcaino at tudelft.nl]
Sent: Friday, December 14, 2018 7:59 AM
To: Marcus Lofverstrom <lofverstrom at email.arizona.edu>
Cc: liwg-core at cgd.ucar.edu; Jeremy Fyke <fykej at ae.ca>
Subject: Re: [Liwg-core] report on new BG/JG: TOPOGRAPHY NOT UPDATED

Hi Marcus,

Thanks for the quick reaction. Great to hear there is no problem,

Miren


On Dec 14, 2018, at 4:55 PM, Marcus Lofverstrom <lofverstrom at email.arizona.edu<mailto:lofverstrom at email.arizona.edu>> wrote:

Hi Miren,

No need to worry about the topography. We decided to only update the atm topo at the beginning of each BG segment instead of each year. Our reasoning is that there are only very modest changes in the ice sheet over 35 years with a synchronous coupling, so updating each year adds unnecessary complexity to the setup with very little gain.

Thanks for the heads up!
Marcus

On Fri, Dec 14, 2018 at 8:49 AM Miren Vizcaino <M.Vizcaino at tudelft.nl<mailto:M.Vizcaino at tudelft.nl>> wrote:
Hi,

as promised, we have analyzed BG1, and found a major show-stopper. I’ll report in a separate email about the checks on things that ARE working.

We found that ATM-TOPO in CLM is not being updated with CISM input. (TOPO_COL is evolving as expected though).

We found that this was also the case in the previous BG/JG, but we missed it … probably because ATM-TOPO was added only as output in BG2

Laura run recently a BG and ATM-TOP was evolving normally. There she used CLM%BGC, while the current and previous BG/JG use CLM%BGC-CROP.

@ Bill S, Kate: do we need to run with -CROP?
@ Bill S, Jeremy, Marcus: does it seem plausible that the code from -CROP somehow does not work to produce topographic update from CLM to CAM?

Thanks,

Miren & Delft group
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