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North Pacific–North Atlantic relationships under stratospheric control?

机译:北太平洋 - 北大西洋地区在平流层控制下?

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摘要

Based on a linear regression/correlation analysis of monthly mean atmospheric sea level pressure (SLP) data from the National Centers for Environmental Prediction (NCEP) reanalysis (1948-2000), we find a significant anticorrelation between pressure in the northern North Atlantic and North Pacific only if the stratospheric circulation is in the "strong polar vortex'' regime but not when the vortex is weak. Since some general circulation models (GCMs) (e.g., European Center/Hamburg (ECHAM4)) are biased toward the strong vortex regime (SVR), they tend to reproduce this anticorrelation already in the mean. The pattern of the "Arctic Oscillation'' (AO) is shown to be consistent with the mean surface pressure differences between the two stratospheric regimes. The typical SW-NE tilt of the node line of the North Atlantic Oscillation (NAO) found with linear analyses (i.e., with such that do not take the regime character of the stratospheric circulation into account) in Northern Hemisphere winter is due to a superposition of correlation patterns based on physical processes working in the troposphere (a strictly meridional dipole and the pattern resulting from planetary wave refraction in the strong vortex regime) and those produced by the rapid transition from one stratospheric regime to the other with subsequent downward propagation of the signal. This result underlines the necessity of the application of nonlinear statistics or the restriction of linear statistics to variations in the stable (quasi-linear) environment of natural regimes.
机译:基于每月平均大气海平面压力(SLP)的线性回归/相关性分析来自国家环境预测中心(NCEP)Reanysics(1948-2000)的数据,我们在北部大西洋和北部的压力之间找到了重要的反作忍说只有在平面循环处于“强极性涡旋”制度中,而且当涡旋弱时,才有。由于一些通用循环模型(GCMS)(例如,欧洲中心/汉堡(ECHAM4))偏向于强烈的涡旋制度(SVR),它们倾向于在平均值上繁殖这种反形状。“北极振荡”(AO)的图案显示出与两个平流层制度之间的平均表面压力差异一致。在北半球冬天的北大西洋振荡(NAO)的节点线的典型SW-NE倾斜(即,与这样的情况下,没有采取其流浪层循环的制度)是由于叠加基于对流层中工作的物理过程的相关模式(由强烈的涡极制造中的行星波折射产生的严格化的偶极和模式)和通过从一个平流层制度的快速过渡产生的那些,随后向下传播信号。该结果强调了非线性统计或线性统计限制对自然制度的稳定(准线性)环境的变化的限制的必要性。

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  • 作者

    J. M. Castanheira;

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  • 年度 2003
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  • 原文格式 PDF
  • 正文语种 eng
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