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

Bette Otto-Bliesner ottobli at ucar.edu
Tue Mar 14 10:09:40 MDT 2017


Me also

On Tue, Mar 14, 2017 at 11:07 AM, Marcus Lofverstrom <marcusl at ucar.edu>
wrote:

> 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>_______________________________________________
>>>> Liwg-core mailing list
>>>> Liwg-core at cgd.ucar.edu
>>>> http://mailman.cgd.ucar.edu/mailman/listinfo/liwg-core
>>>>
>>>>
>>>> - - - - - - - - - - - - - - - - - - - - - - - - - - -
>>>>
>>>> *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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>>>
>>>
>>>
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>>>
>>
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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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>
>


-- 
Bette L. Otto-Bliesner
Deputy Director and Senior Scientist
Climate and Global Dynamics Laboratory

National Center for Atmospheric Research
1850 Table Mesa Drive
Boulder, Colorado 80305
Ph:  303-497-1723
Fax: 303-497-1348
Email: ottobli at ucar.edu
Web page: http://www.cgd.ucar.edu/ccr/ottobli
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