The unusual cold might have been driven at least partly by the Arctic Oscillation (AO).

这不寻常寒冷的一部分原因可能由于是北极涛动(AO)。

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Conroy's hypothesized link between dust levels and the Arctic Oscillation "probably warrants more investigation," Thompson says.

Thompson说，Conroy关于尘土量与北极震荡之间存在联系的假定“可能还需要更多准确的数理依据”。

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Then, this past winter, there was a natural weather shift called the Arctic Oscillation, sort of a cold weather cousin to El Nino.

然后在上个冬季，出现了一种气候变化，就是所谓的“北极涛动”，和厄尔尼诺现象相关联的寒冷气候现象。

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In particular, in polar regions it appears to weaken the Arctic Oscillation winds.

FORBES: 2011 Forecast: World Outperforms U.S., Europe Scuttles

This pole-centred roundel of warm-in-cold is symptomatic of what climatologists call the negative phase of the Arctic oscillation (AO).

ECONOMIST: Britain��s cold snap is explained by the Arctic oscillation

When the Arctic Oscillation turns negative, that is, when the winds weaken, the cold air normally trapped around the North Pole surges south.

FORBES: 2011 Forecast: World Outperforms U.S., Europe Scuttles