[Liwg-core] Good news: realistic GrIS ablation!; and next telecom

Jeremy Fyke garmeson.lanl at gmail.com
Tue Mar 14 09:59:18 MDT 2017


I can do Wednesday 9-10MDT too (and *will* be there).

Jer


On Tue, Mar 14, 2017 at 7:18 AM, Kampenhout, L. van (Leo) <
L.vanKampenhout at uu.nl> wrote:

> Hi all,
>
> I’m also available between 4 - 5 PM CET, which is the proposal if I’m not
> mistaken (9-10 am MDT).
>
>
> Leo
>
>
> On 13 Mar 2017, at 16:59, Lipscomb, William Henry <lipscomb at lanl.gov>
> wrote:
>
> Hi Miren,
>
> I agree—this looks great.  Many thanks to everyone who’s been working on
> these simulations.  Please keep us posted as the run gets closer to
> equilibrium.
>
> I could make a telecon on Wednesday at 9 MDT.  Please note that the U.S.
> moved to daylight time this past weekend, but Europe hasn’t sprung forward
> yet.  So the current time difference between Europe and Mountain is 7 hours
> (instead of the usual 8).
>
> Thanks,
>
> Bill L.
>
>
>
> On Mar 10, 2017, at 12:31 PM, Miren Vizcaino <M.Vizcaino at tudelft.nl>
> wrote:
>
> Hi Jer
>
> Downscaled SMB is included in the figure I sent.
>
> Maximum snow depth is 10 m w.e. for GrIS. This means that we the snow/firn
> pack needs many years for equilibrium, so we need a spin-up strategy that
> can be acceptable for the CLM folks as well. We have run only 7 years so
> far. We need to run further to get an idea of the equilibrium snow/firn
> thickness distribution per elevation class per grid cell. If this becomes
> clear early in the simulation, we could implement something in the line
> proposed by Bill Sacks during the Winter Meeting. But first we need to run
> more years to understand the dynamics towards equilibrium.
>
> Thanks, Miren
>
>
> On Mar 10, 2017, at 5:10 PM, Jeremy Fyke wrote:
>
> Hey all,
>
> Thanks for update, Miren!  A few follow-up questions:
> -what maximum snow depth are you using here?
> -what does downscaled SMB look like (which is ultimately what the ice
> sheet will see)?
>
> Jer
>
> On Fri, Mar 10, 2017 at 8:59 AM, Lenaerts, J.T.M. (Jan) <j.lenaerts at uu.nl>
> wrote:
>
>> Hi Miren (and Raymond),
>>
>> Thanks for the message and all the work. This looks great and is
>> consistent with what we saw earlier, with the additional improvement of the
>> Northern Greenland bias with your suggested initialisation. I am really
>> curious how this will look in the 20th century!
>>
>> I cannot make it next Wednesday but I am happy to discuss with Leo and/or
>> you beforehand.
>>
>> All the best,
>>
>> Jan
>>
>>
>>
>> On 10 Mar 2017, at 14:29, Miren Vizcaino <M.Vizcaino at tudelft.nl> wrote:
>>
>> Dear All,
>>
>> This email contains two messages
>>
>> 1 - Good news. We have tried the new SCF with #134 and snow thickness
>> reset to 1 m w.e. over the GrIS, and now CESM is able to realistically
>> simulate the ablation areas at ALL ice sheet margins, including N and NE
>> (see attached figure)!
>> The reason for the differences with the “control” #134 presented by Leo
>> at the meeting is that 1 m w.e. is below Wmax = 2 m w.e. The span-up #134
>> snow/firn cover prevented thick snow/firn columns from ablating.
>>
>> Congratulations and many thanks to everybody, very specially to Leo the
>> implementation of the SCF and to Raymond for his work on the impact of
>> snow/firn initialization.
>>
>> 2 - I propose to have a telecom next Wednesday, e.g., to discuss how to
>> spin-up the snow/firn pack in time for the official CESM2.0 pre-industrial
>> BG control.
>>
>> Regards, Miren
>>
>>
>>
>>
>> <PastedGraphic-2.tiff>_______________________________________________
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>>
>> - - - - - - - - - - - - - - - - - - - - - - - - - - -
>>
>> *Jan Lenaerts  *IMAU, Utrecht University || University of Colorado
>> @lenaertsjan <https://twitter.com/lenaertsjan> || website
>> <http://www.colorado.edu/lab/icesheetclimate/>
>>
>>
>>
>>
>>
>>
>>
>>
>>
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>>
>
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>
> ---
> William Lipscomb
> Los Alamos National Laboratory
> Group T-3, MS B216
> Los Alamos, NM 87545
> 505-667-0395 <(505)%20667-0395>
>
>
>
>
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