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Understanding uncertainties in the response of ENSO to greenhouse warming

机译:了解ENSO对温室效应的响应中的不确定性

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The response of ENSO to increases in greenhouse gases is found to be markedly different in climate change simulations using two different versions of the Hadley Centre Coupled Models (HadCM2 and HadCM3). Using HadCM2, Collins [2000] found an increase in the amplitude, an increase in the frequency, and a shift in the phase of ENSO at 4xCO(2). In HadCM3 it is shown that there are no significant changes in ENSO statistics at 4xCO(2). Differences in the two models ENSO response are traced to differences in the response of the mean meridional gradients of temperature either side of the equator. These differences in the mean pattern of climate change are brought about by subtle changes in the physical parametrisation schemes, rather than the main differences between HadCM2 and HadCM3 which are enhanced horizontal ocean resolution and the removal of flux adjustments. Thus the response of ENSO variability to increasing greenhouse gases can depend in an unexpected and quite non-linear way to subtle changes in the models representation of sub grid-scale processes. [References: 20]
机译:在使用两种不同版本的哈德利中心耦合模型(HadCM2和HadCM3)进行的气候变化模拟中,发现ENSO对温室气体增加的响应明显不同。 Collins [2000]使用HadCM2,发现振幅增加,频率增加以及ENSO的相位在4xCO(2)处移动。在HadCM3中,表明ENSO统计数据在4xCO(2)处没有显着变化。两种模型ENSO响应的差异可追溯到赤道两侧温度平均经度梯度的响应差异。这些平均气候变化模式的差异是由物理参数化方案的细微变化引起的,而不是HadCM2和HadCM3之间的主要差异,即水平海洋分辨率的提高和通量调整的取消。因此,ENSO变化对温室气体增加的响应可能会以一种意想不到且非常非线性的方式依赖于亚网格规模过程模型表示中的细微变化。 [参考:20]

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