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The unusual Buenos Aires snowfall of July 2007

机译:2007年7月异常布宜诺斯艾利斯降雪

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Buenos Aires lies near the east coast of South America at about 34°S where snow is extremely rare. The only events measured in the city had occurred before 1930. The high latitude causes of the widespread snowstorm of 9th July 2007 are discussed, making it an extraordinary case in light of the historical record. Here, we show that this event can be linked to unprecedented seasonal circulation anomalies in the sub‐Antarctic, featuring a dipole around the Antarctic Peninsula that drives the cold advection toward mid‐latitudes. Our index suggests that conditions have become more favorable for cold surges over mid‐latitudes with a repetition of widespread snow over mid‐latitudes in 2009. Copyright ? 2010 Royal Meteorological Society.
机译:布宜诺斯艾利斯位于南美洲东海岸附近,温度约为34°S,那里的雪非常少。该市唯一的事件发生在1930年之前。讨论了2007年7月9日大范围暴风雪的高纬度原因,根据历史记录,这是一个非常案例。在这里,我们表明该事件可能与南极洲前所未有的季节性环流异常有关,南极半岛周围有一个偶极子,将冷对流带向中纬度。我们的指数表明,中纬度地区的冷潮条件更加有利,2009年中纬度地区再次出现大雪。 2010年皇家气象学会。

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