北大西洋涛动 (NAO)于1920年由Sir Gilbert Walker（G.沃克）发现，三大涛动之一，指亚速尔高压和冰岛低压之间气压的反向变化关系，即当亚速尔地区气压偏高时，冰岛地区气压偏低，反之亦然。 NAO是北大西洋地区大气最显著的模态。 Eu não li esse livro ― i haven’t read that book Por favor, não faça isso ― please, don’t do that (preceding verbs) used in sentences containing a negative pronoun as the object
See double negative eu não fiz nada ― i didn’t do anything (literally, “i didn’t do nothing.”) (brazil, colloquial, following verb phrases) used to emphasise or reinforce (in the case that. North atlantic oscillation (nao), an irregular fluctuation of atmospheric pressure over the north atlantic ocean that has a strong effect on winter weather in europe, greenland, northeastern north america, north africa, and northern asia. 请问下谁能讲一下北大西洋涛动（NAO），太平洋十年涛动（PDO），南方涛动（SO）之间的联系？ NAO指数的含义是 葡萄牙的里斯本（北大西洋较低纬度的副高） 和 冰岛（冰岛低压） 之间的标准 月海平面气压（SLP）差值。
The nao was discovered through several studies in the late 19th and early 20th centuries
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