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

Marcus Lofverstrom marcusl at ucar.edu
Tue Mar 14 10:07:10 MDT 2017


Should work for me too.

// Marcus

On Tue, Mar 14, 2017 at 9:59 AM, Jeremy Fyke <garmeson.lanl at gmail.com>
wrote:

> 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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-- 
Marcus Löfverström (PhD)
Post-doctoral researcher
National Center for Atmospheric Research
1850 Table Mesa Dr.
80305 Boulder, CO, USA

https://sites.google.com/site/lofverstrom/
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