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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Imprints of the North Atlantic Oscillation on four unusual atmospheric parameters
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Imprints of the North Atlantic Oscillation on four unusual atmospheric parameters

机译：北大西洋涛动对四个异常大气参数的影响

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摘要

Using data for 41 yr (1958-1998) from the National Center for Environmental Prediction-National Center for Atmospheric Research reanalysis the authors study the impact of the North Atlantic Oscillation (NAO) on four atmospheric parameters. These four parameters have three common characteristics: their previous limited use as climate diagnosis tools, their high dependence on changes in atmospheric circulation and their relationship with variables associated with the development of synoptic perturbances. They are: (1) relative angular momentum from 500 hPa to 200 hPa and from 55°N to 90°N, (2) advection of temperature at 500 hPa, (3) equivalent temperature at 850 hPa and (4) distribution of upper level low systems (ULL). The most significant results are: (1) a significant positive correlation between the relative angular momentum from 500 hPa to 200 hPa and from 55°N to 90°N with the NAO index computed as the normalized pressure difference between Ponta Delgada (Azores) and Reykjavik (Iceland), (2) the NAO affects 500 hPa temperature advection from 45°N to 70°N and a positive NAO index is alternatively related to positive or negative anomalies of advection. The relationship is positve over the Atlantic, Asia and Western America and negative over Europe, and Pacific and Eastern America. (3) The correlation pattern between NAO index and the equivalent temperature at 850 hPa shows a semiannular structure with negative correlations over the Arctic and positive correlations over midlatitudes with the exception of the Pacific area, and (4) the distribution of ULL systems is only influenced by NAO over both sides of the Atlantic Ocean and for the latitude belt from 20°N to 50°N.
机译：利用来自国家环境预测中心-国家大气研究中心的41年（1958-1998）数据，作者研究了北大西洋涛动（NAO）对四个大气参数的影响。这四个参数具有三个共同的特征：它们以前作为气候诊断工具的使用受到限制，它们对大气环流变化的高度依赖以及与与天气扰动发展相关的变量之间的关系。它们是：（1）500 hPa至200 hPa和55°N至90°N的相对角动量，（2）500 hPa时的温度对流，（3）850 hPa时的等效温度，以及（4）上部的分布级别低的系统（ULL）。最显着的结果是：（1）从500 hPa到200 hPa和从55°N到90°N的相对角动量之间存在显着的正相关，而NAO指数计算为Ponta Delgada（Azores）和雷克雅未克（冰岛），（2）NAO影响从500°N到70°N的500 hPa对流，并且正NAO指数与对流的正异常有关。在大西洋，亚洲和西美洲，这种关系是正向的;在欧洲，太平洋和东欧，这种关系是负的。 （3）NAO指数与850 hPa的等效温度之间的相关关系模式显示出一个半环形结构，除太平洋地区外，在北纬上具有负相关，在中纬度上具有正相关，（4）仅ULL系统的分布在大西洋两岸受到NAO的影响，并影响了从20°N到50°N的纬度带。

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