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Using relative angular momentum to study NAO/AO

机译:使用相对角动量研究NAO / AO

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摘要

North Atlantic extratropical variability is highly dominated by a variability mode called North Atlantic Oscillation -NAO- or Arctic Oscillation -AO-. The difference in the nomenclature is due to the different points of view from which this variability mode is analysed: regional in the first case and annular in the second one. Although the effects over North Atlantic Climate can be similar, subjacent physical processes are very different, especially when spatial structures are compared. This work is focussed on the study of this spatial structure. Therefore a magnitude related to this structure is used: relative angular momentum (RAM). A comparative study between temporal series of both modes (indices) and RAM was performed in order to look for similarities, as well as correlation maps between RAM and Temperature and geopotential height data for the whole Hemisphere. Results show a pattern that is not restricted to the North Atlantic but does not show a purely annular character.
机译:北大西洋的温带变化主要由一种称为北大西洋涛动-NAO-或北极涛动-AO-的变化模式主导。术语上的差异是由于从不同的角度分析了这种可变性模式:在第一种情况下为区域性,在第二种情况下为环形。尽管对北大西洋气候的影响可能相似,但其下层物理过程却大不相同,尤其是在比较空间结构时。这项工作专注于这种空间结构的研究。因此,使用与该结构有关的量值:相对角动量(RAM)。为了寻找相似性,以及在RAM和温度之间的关联图以及整个半球的地势高度数据,对两种模式(指数)和RAM的时间序列进行了比较研究。结果显示了一种模式,该模式不仅限于北大西洋,而且不显示纯粹的环形特征。

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