Intercomparison of general circulation models for hot extrasolar planets
Intercomparison of general circulation models for hot extrasolar planets
复制标题
热系外行星大气环流模型的相互比较
DOI:
10.1016/j.icarus.2013.11.027
复制
发表时间:
2014
期刊:
影响因子:
3.2
通讯作者:
Polichtchouk I
中科院分区:
文献类型:
--
作者:
Polichtchouk I
We compare five general circulation models (GCMs) which have been recently used to study hot extrasolar planet atmospheres (BOB, CAM, IGCM, MITgcm, and PEQMOD), under three test cases useful for assessing model convergence and accuracy. Such a broad, detailed intercomparison has not been performed thus far for extrasolar planets study. The models considered all solve the traditional primitive equations, but employ different numerical algorithms or grids (e.g., pseudospectral and finite volume, with the latter separately in longitude–latitude and ‘cubed-sphere’ grids). The test cases are chosen to cleanly address specific aspects of the behaviors typically reported in hot extrasolar planet simulations: (1) steady-state, (2) nonlinearly evolving baroclinic wave, and (3) response to fast timescale thermal relaxation. When initialized with a steady jet, all models maintain the steadiness, as they should—except MITgcm in cubed-sphere grid. A very good agreement is obtained for a baroclinic wave evolving from an initial instability in pseudospectral models (only). However, exact numerical convergence is still not achieved across the pseudospectral models: amplitudes and phases are observably different. When subject to a typical ‘hot-Jupiter’-like forcing, all five models show quantitatively different behavior—although qualitatively similar, time-variable, quadrupole-dominated flows are produced. Hence, as have been advocated in several past studies, specific quantitative predictions (such as the location of large vortices and hot regions) by GCMs should be viewed with caution. Overall, in the tests considered here, pseudospectral models in pressure coordinate (PEBOB and PEQMOD) perform the best and MITgcm in cubed-sphere grid performs the worst.
登录
查看更多内容
DOI:
--
发表时间:
2010
期刊:
影响因子:
--
作者:
K. Heng;K. Menou;P. Phillipps
通讯作者:
P. Phillipps
DOI:
--
发表时间:
2012
期刊:
影响因子:
--
作者:
V. L. Bending;S. R. Lewis;U. Kolb
通讯作者:
U. Kolb
DOI:
10.1088/0004-637x/714/2/1334
发表时间:
2009
期刊:
The Astrophysical Journal
影响因子:
--
作者:
E. Rauscher;K. Menou
通讯作者:
K. Menou
DOI:
10.1086/589325
发表时间:
2008
期刊:
The Astrophysical Journal
影响因子:
--
作者:
A. Showman;C. Cooper;J. Fortney;M. Marley
通讯作者:
M. Marley
DOI:
--
发表时间:
2013
期刊:
影响因子:
--
作者:
L. Bengtsson
通讯作者:
L. Bengtsson