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The North Atlantic Oscillation (NAO) is a weather phenomenon over the North Atlantic Ocean of fluctuations in the difference of atmospheric pressure at sea level (SLP) between the Icelandic Low and the Azores High.
The Azores High also known as North Atlantic (Subtropical) High/Anticyclone or the Bermuda-Azores High, is a large subtropical semi-permanent centre of high atmospheric pressure typically found south of the Azores in the Atlantic Ocean, at the Horse latitudes. It forms one pole of the North Atlantic oscillation, the other being the Icelandic Low.
Later research found atmospheric changes, such as an increase in low cloud cover [122] and a strengthening of the North Atlantic oscillation (NAO) have also played a major role in this local cooling. [119] The overall importance of the NAO in the phenomenon is disputed [120] but cold-blob trends alone cannot be used to analyze the strength of ...
Evidence for a multidecadal climate oscillation centered in the North Atlantic began to emerge in 1980s work by Folland and colleagues, seen in Fig. 2.d.A. [5] That oscillation was the sole focus of Schlesinger and Ramankutty in 1994, [6] but the actual term Atlantic Multidecadal Oscillation (AMO) was coined by Michael Mann in a 2000 telephone interview with Richard Kerr, [7] as recounted by ...
The most emblematic teleconnection is that linking sea-level pressure at Tahiti and Darwin, Australia, which defines the Southern Oscillation. Another well-known teleconnection links the sea-level pressure over Iceland with the one over the Azores, traditionally defining the North Atlantic Oscillation (NAO). [1]
The Gulf Stream separates from the US coast near Cape Hatteras (35°N, 75°W) and then travels eastwards across the North Atlantic, becoming the North Atlantic current at about 55°W. In the region between 75°W and 55°W it is subject to meanders and is frequently accompanied by eddies. The northern edge of the current is marked by a sharp ...
Apart from a thermal anticyclone over Australia during the southern winter, the centers of action are fairly stable over the oceans. The southern parts of the Atlantic, Indian, and Pacific oceans have three anticyclones over the Horse latitudes. Further South, a fairly continuous series of low pressure areas cover the ocean near Antarctica ...
[81] [82] Despite known changes in tropical cyclone activity due to changes in the El Niño/Southern Oscillation (ENSO), [83] there is no known relationship between rainfall in Puerto Rico and the ENSO cycle. However, when values of the North Atlantic oscillation are high during the winter, precipitation is lower than average for Puerto Rico. [84]