Representation of the ENSO Combination Mode and its Asymmetric SST Response in Different Resolutions of HadGEM3
Representation of the ENSO Combination Mode and its Asymmetric SST Response in Different Resolutions of HadGEM3
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HadGEM3不同分辨率下ENSO组合模式及其不对称海温响应的表示
DOI：
10.1007/s00376-018-7285-5
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发表时间：
2018-06
影响因子：
5.8
通讯作者：
Wu Peili
中科院分区：
文献类型：
--
作者：
Wan Jianghua;Ren Hongli;Wu Peili
以往的研究表明，在印度洋-太平洋地区，ENSO和西太平洋暖池年周期之间的非线性相互作用产生了一种组合模式（C模式）。本文使用水平分辨率N96、N216和N512的三组模拟来评估HadGEM 3中对该C模式及其非对称SST响应的模拟及其分辨率灵敏度。结果表明，HadGEM 3模式能较好地反映C模态相关的地面风场异常的空间分布特征，以及热带太平洋海温的非对称响应，但与ENSO模式相比，HadGEM 3模式严重高估了C模态的解释变率。具有三种分辨率的模式能够在近年组合频率处再现C模的明显谱峰，但在模拟较长周期时的性能不令人满意，这可能是由于ENSO模的模拟不切实际。提高水平分辨率可以改善C模式的大气和海洋表示之间的一致性，但不一定提高C模式模拟与观测相比的精度。
Previous studies have revealed a combination mode (C-mode) occurring in the Indo-Pacific region, arising from nonlinear interactions between ENSO and the western Pacific warm pool annual cycle. This paper evaluates the simulation of this C-mode and its asymmetric SST response in HadGEM3 and its resolution sensitivity using three sets of simulations at horizontal resolutions of N96, N216 and N512. The results show that HadGEM3 can capture well the spatial pattern of the C-mode associated surface wind anomalies, as well as the asymmetric response of SST in the tropical Pacific, but it strongly overestimates the explained variability of the C-mode compared to the ENSO mode. The model with the three resolutions is able to reproduce the distinct spectral peaks of the C-mode at the near annual combination frequencies, but the performance in simulating the longer periods is not satisfactory, presumably due to the unrealistic simulation of the ENSO mode. Increasing the horizontal resolution can improve the consistency between atmospheric and oceanic representations of the C-mode, but not necessarily enhance the accuracy of C-mode simulation compared with observation.
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