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首页> 外文期刊>Geophysical Research Letters >Tropical-extratropical connection in the Atlantic atmosphere-ocean variability
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Tropical-extratropical connection in the Atlantic atmosphere-ocean variability

机译：大西洋大气-海洋变化中的热带-热带联系

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A question how sea surface temperature (SST) fluctuations in the tropical Atlantic affect the North Atlantic atmosphere-ocean system is addressed using an atmospheric general circulation model coupled to a 50-m-deep slab ocean (MGCM), and a linear baroclinic model. A comparison of a 60-yr integration, in which the tropical SSTs are prescribed to observations (TOGA-ML), with the control MGCM run shows that the tropical SST variations selectively enhance variance of the North Atlantic Oscillation (NAO) by about 80%. This is partly due to extratropical height anomalies associated with two dominant modes, monopole and dipole, of tropical Atlantic SST variability because they both have a projection on to the NAO in the TOGA-ML run. The simulated midlatitude height anomalies accompany characteristic SST anomaly patterns beneath, and they are consistent with observations. Analyses of steady linear responses to the heating in the tropical Atlantic and transient eddy feedback in midlatitude reveal that the substantial part of height anomalies is generated by the latter rather than the former. The anomalous eddy forcing is, however, organized not only by the heating in the tropical Atlantic but also by the tropical Pacific SST variations through the teleconnection over North America. It is suggested that the tropical Atlantic SST variability does affect the North Atlantic atmosphere and ocean, but the dynamical connection is tenuous in comparison with the Pacific.
机译：使用结合了50米深平板海洋（MGCM）的大气总环流模型和线性斜压模型，可以解决热带大西洋海表温度（SST）波动如何影响北大西洋大气-海洋系统的问题。对60年积分的比较（其中将热带海温指定为观测值（TOGA-ML））与对照MGCM进行的比较显示，热带海温的变化选择性地使北大西洋涛动（NAO）的方差增加了约80％ 。这部分是由于与热带大西洋海表温度变异的两个主要模式（单极子和偶极子）相关的温带高度异常，因为它们在TOGA-ML演算中都对NAO有投影。模拟的中纬度高度异常伴随下面的特征性SST异常模式，并且与观测值一致。对热带大西洋加热和中纬度瞬时涡流反馈的稳定线性响应分析表明，高度异常的很大一部分是由后者而不是前者产生的。但是，异常的涡旋强迫不仅通过热带大西洋的加热来组织，而且通过北美洲的遥遥连接通过热带太平洋的海温变化来组织。有人认为，热带大西洋海表温度的变化确实会影响北大西洋的大气和海洋，但与太平洋相比，动力联系是微弱的。

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