Climate sensitivity of the NCAR Community Climate Model (CCM2) to horizontal resolution
Climate sensitivity of the NCAR Community Climate Model (CCM2) to horizontal resolution
复制标题
NCAR 社区气候模型 (CCM2) 对水平分辨率的气候敏感性
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
J. Hack
中科院分区：
文献类型：
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作者：
D. Williamson;J. Kiehl;J. Hack
探讨了国家大气研究中心社区气候模式（CCM 2）模拟的气候水平分辨率的依赖性。采用R15，T21，T31，T42，T63和T106水平频谱截断的模拟进行了比较。与诊断云方案相关联的参数被修改为每个分辨率，以提供类似的全球平均云辐射强迫在每个分辨率。总体而言，与早期研究一样，低分辨率R15和T21模拟与中等分辨率T42模拟之间存在很大差异。许多气候统计数据显示，随着分辨率的增加，信号单调，最大的变化发生在低分辨率到中等分辨率之间。虽然单调信号通常来自低分辨率模拟到大气分析，但在某些情况下，它会继续超出最高分辨率的分析。在发生收敛的地方，并不总是大气分析，最高分辨率的模拟并不是所有措施中最好的。虽然许多气候统计数据趋于一致，但维持气候的过程却不一致，特别是在区域基础上考虑时。这意味着，需要更精细的尺度来捕捉非线性过程，迫使中等尺度。总的来说，似乎至少需要T42分辨率，但更高的分辨率会更好。T42的应用应考虑这些分辨率信号指示的模型误差如何影响任何结果。
The dependence on horizontal resolution of the climate simulated by the National Center for Atmospheric Research Community Climate Model (CCM2) is explored. Simulations employing R15, T21, T31, T42, T63, and T106 horizontal spectral truncations are compared. Parameters associated with the diagnostic cloud scheme are modified for each resolution to provide similar global average cloud radiative forcing at each resolution. Overall, as with earlier studies, there are large differences between the low resolution R15 and T21 simulations and the medium resolution T42 simulation. Many climate statistics show a monotonic signal with increasing resolution, with the largest variation occurring from low to medium resolution. Although the monotonic signal is often from the low resolution simulations toward atmospheric analyses, in some cases it continues beyond the analyses at the highest resolution. Where convergence occurs, it is not always to the atmospheric analyses, and the highest resolution simulations are not the best by all measures. Although many climate statistics converge, the processes that maintain the climate do not, especially when considered on a regional basis. The implication is that the finer scales are required to capture the nonlinear processes that force the medium scales. Overall, it appears that, at a minimum, T42 resolution is required, but higher resolution would be better. Applications at T42 should take into consideration how model errors indicated by these resolution signals might affect any findings.