[Grad-postdoc-assn] Seminar this Wed: Mitch Moncrieff
Yumin Moon
ymoon at ucar.edu
Wed Mar 5 09:21:24 MST 2014
The lunch after today's seminar will be in FL2-1002.
On Mon, 03 Mar 2014 10:05:12 -0700
"Yumin Moon" <ymoon at ucar.edu> wrote:
>
> Hello all,
>
> The next ASP seminar by Mitch Moncrieff (NCAR/CGD) is 11 am this
> Wednesday (March 5th) at FL2 Large Auditorium.
>
> You are all more than welcomed to have a lunch with the speaker
> afterward.
>
> Organized Convection in Global Context
>
> Satellite observations show that precipitating convective cloud
> systems in Earth's atmosphere tend to organize into spatially
>coherent
> structures embedded in fields of cumulus notably, but not only, in
>the
> Tropics. At a fundamental level this property is analogous to
> coherent structures in turbulent fluids. Although organization can
> occur in traditional climate models with 100s-km computational
>meshes,
> its morphology is usually not realistic. The reason for this
> misbehavior is two-pronged. Firstly, convective parameterizations
>were
> designed with turbulent mixing by transient cumulus in mind, and
> regardless of coherent convective systems. Secondly, the model
> resolution is too coarse to permit explicit systems. Organization
> involves interaction between diabatic heating, momentum transport,
> vertical shear and wave dynamics across a range of scales. We have
> excellent knowledge of the O(1km - 1000km) meso-synoptic range from
> field campaigns, cloud-system resolving models and dynamical
>analogs.
> Now that operational global weather models and experimental climate
> models both have O(10km) mesoscale-permitting meshes, we need to
> seriously consider the representation of organized convection in
>these
> models. Computational and theoretical insights are in place, and
> high-resolution global weather analyses in the form of a 'virtual
> global field campaign' provide useful information. The categories of
> organization featured in this talk are propagating convective
>systems
> over the continental United States and multiscale convective systems
> associated with the Madden-Julian oscillation, the leading mode of
> intraseasonal tropical variability.
>
> Sincerely,
> The ASP seminar committee
>Fang Fang, Rajesh Kumar, Yumin Moon, Jorge Salazar, and Hyeyum Shin
>
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