 |
| Titel |
Performance of the HOMME dynamical core in the aqua-planet configuration of NCAR CAM4: equatorial waves |
| VerfasserIn |
S. K. Mishra, M. A. Taylor, R. D. Nair, H. M. Tufo, J. J. Tribbia |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
0992-7689
|
| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 29, no. 2 ; Nr. 29, no. 2 (2011-02-02), S.221-227 |
| Datensatznummer |
250016961
|
| Publikation (Nr.) |
 copernicus.org/angeo-29-221-2011.pdf |
|
|
|
|
|
| Zusammenfassung |
| A new atmospheric dynamical core, named the High Order Method Modeling
Environment (HOMME), has been recently included in the NCAR-Community
Climate System Model version 4 (CCSM4). It is a petascale capable high-order
element-based conservative dynamical core developed on a cubed-sphere grid.
We have examined the model simulations with HOMME using the aqua-planet mode
of CAM4 (atmospheric component of CCSM4) and evaluated its performance in
simulating the equatorial waves, considered a crucial element of climate
variability. For this we compared the results with two other established
models in CAM4 framework, which are the finite-volume (FV) and Eulerian
spectral (EUL) dynamical cores. Although the gross features seem to be
comparable, important differences have been found among the three dynamical
cores. The phase speed of Kelvin waves in HOMME is faster and more
satisfactory than those in FV and EUL. The higher phase speed is attributed
to an increased large-scale precipitation in the upper troposphere and a
more top-heavy heating structure. The variance of the n=1 equatorial
Rossby waves is underestimated by all three of them, but comparatively HOMME
simulations are more reasonable. For the n=0 eastward inertio-gravity
waves, the variances are weak and phase speeds are too slow, scaled to
shallow equivalent depths. However, the variance in HOMME is relatively more
compared to the two other dynamical cores. The mixed Rossby-gravity waves
are feeble in all the three cases. In summary, model simulations using HOMME
are reasonably good, with some improvement relative to FV and EUL in
capturing some of the important characteristics associated with equatorial
waves. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|