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首页> 外文期刊>Nature >DOMINANT INFLUENCE OF ATMOSPHERIC CIRCULATION ON SNOW ACCUMULATION IN GREENLAND OVER THE PAST 18,000 YEARS
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DOMINANT INFLUENCE OF ATMOSPHERIC CIRCULATION ON SNOW ACCUMULATION IN GREENLAND OVER THE PAST 18,000 YEARS

机译：过去18,000年中大气环流对格陵兰岛积雪的显着影响

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PROJECTIONS of sea-level rise due to greenhouse warming often involve the assumption that increased water vapour pressure will enhance snow accumulation in cold regions of ice sheets, partially offsetting the increased melting of low-latitude and low-altitude ice(1-3). To test whether this has been true in the past, we compare accumulation rates(4) and temperatures derived from the oxygen isotope composition(5) of ice in the deep core obtained by the Greenland Ice Sheet Project II (GISP2), We find that atmospheric circulation, not temperature, seems to have been the primary control on snow accumulation in central Greenland over the past 18,000 years. During both warm (Holocene) and cold (Younger Dryas, Last Glacial Maximum) climate regimes, the sensitivity of accumulation to temperature changes is less than expected if accumulation is controlled thermodynamically by the ability of warmer air to deliver more moisture. During transitions between warm and cold climate states, in contrast, accumulation varies more than can be explained in purely thermodynamic terms, probably because of changes in storm tracks, Thus, in a world warmed by the greenhouse effect, circulation changes may be more important than direct temperature effects in determining snow accumulation in Greenland and its contribution to sea-level change. [References: 35]
机译：温室效应导致海平面上升的预测通常涉及以下假设：水蒸气压力的增加将增加冰原寒冷地区的积雪，部分抵消了低纬度和低纬度冰融化的增加（1-3）。为了检验过去是否成立，我们比较了格陵兰冰原计划II（GISP2）获得的深部岩心中冰的氧同位素组成（5）的累积速率（4）和温度，我们发现在过去的18000年中，大气环流而不是温度似乎一直是格陵兰中部积雪的主要控制手段。在温暖的（全新世纪）和寒冷的（年轻的树蛙，最后一次冰川期）气候方案中，如果通过更暖的空气传递更多水分的能力来热力学控制蓄积，则蓄积对温度变化的敏感性低于预期。相反，在温暖和寒冷的气候状态之间的过渡期间，积累的变化超出了纯粹用热力学术语可以解释的范围，这可能是由于风暴径的变化所致。因此，在一个受温室效应影响的世界中，循环变化可能比直接温度影响决定格陵兰积雪及其对海平面变化的影响。 [参考：35]

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