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| Titel |
GEWEX Cloud System Study (GCSS) cirrus cloud working group: development of an observation-based case study for model evaluation |
| VerfasserIn |
H. Yang, S. Dobbie, G. G. Mace, A. Ross, M. Quante |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 5, no. 3 ; Nr. 5, no. 3 (2012-06-08), S.829-843 |
| Datensatznummer |
250002620
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| Publikation (Nr.) |
 copernicus.org/gmd-5-829-2012.pdf |
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| Zusammenfassung |
The GCSS working group on cirrus focuses on an inter-comparison of model
simulations ranging from very detailed microphysical and dynamical models
through to general circulation models (GCMs). The past GCSS cirrus cloud
inter-comparison highlighted the wide range in modelling results that was a
surprise to the modelling community. That inter-comparison was idealised and, therefore, a key issue was that it did not benefit from observations to help distinguish between model
performances.
In this work, we aim to address this key issue by developing an observationally based case study to be used for the GCSS cirrus modelling inter-comparison study.
We focused on developing a case that had sufficient observations with which to evaluate models, to help identify
which models in the inter-comparison are performing well and highlight areas
for model development. Furthermore, it will provide a base case for future
model comparisons or testing of new or updated models. This paper outlines
the modelling case development and the inter-comparison results will be
presented in a follow-on paper.
The case was based on the 9 March 2000 Atmospheric Radiation
Measurement (ARM) Southern Great Plains (SGP) during an intensive observation
period (IOP). The case was developed utilising various observations including
ARM SGP remote sensing including the MilliMeter Cloud Radar (MMCR),
radiometers, radiosondes, aircraft observations, satellite observations,
objective analysis and complemented with results from the Rapid Update
Cycle (RUC) model as well as bespoke gravity wave simulations used to provide
the best estimate for large scale forcing. The retrievals of ice water
content, ice number concentration and fall velocity provide several
constraints to evaluate model performances. Initial testing of the case has
been reported using the UK Met Office Large Eddy Simulation Model (LEM) which
suggests the case is appropriate for the model inter-comparison study. To our
knowledge, this case offers the most detailed case study for cirrus
comparison available and we anticipate this will offer significant benefits
over past comparisons which have mostly been loosely based on observations. |
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