| 单词 | arctic oscillation |
| 释义 | > as lemmasArctic Oscillation Arctic Oscillation n. Climatology a non-periodic variation in surface atmospheric pressure in the Arctic region coupled with an opposite variation further south (and associated with similar variation in the North Atlantic); an index of this variation, which is negative when Arctic pressures are high, resulting in greater southward movement of cold polar air to temperate mid-latitude regions. ΚΠ 1998 D. W. J. Thompson & J. M. Wallace in Geophysical Res. Lett. 25 1297 Coupled to strong fluctuations at the 50‐hPa level on the intraseasonal, interannual, and interdecadal time scales, this ‘Arctic Oscillation’ (AO) can be interpreted as the surface signature of modulations in the strength of the polar vortex aloft. 2001 Times 6 July i. 13/6 Mild winters in Britain during the past two decades have been caused by natural variations in a climate system known as the Arctic Oscillation, rather than by global warming. 2005 New Yorker 25 Apr. 2/2 During this same period, an atmospheric circulation pattern known as the Arctic Oscillation has mostly been in what climatologists call a ‘positive’ mode. 2011 Gazette (Montreal) (Nexis) 11 Mar. A2 Now, there is a fairly complex new scientific theory to explain why climate change can mean more winter, not less, involving the Arctic Oscillation effect. < as lemmas |
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