The semi-annual oscillation and Antarctic climate. Part 3 : The role of near-surface wind speed and cloudiness
The semi-annual oscillation and Antarctic climate. Part 3 : The role of near-surface wind speed and cloudiness
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半年振荡与南极气候。
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
M. Broeke
中科院分区：
文献类型：
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作者：
M. Broeke
半年振荡（SAO），近地面风速和云量在七个南极站之间的相互作用进行了说明，是如何影响近地面温度。一个牢固建立的半年波，在平均年周期的风速和云量，被发现在两个站有限的本地干扰：哈雷和法拉第。自20世纪70年代后期以来，SAO显著减弱，这些站点的风速和云量的年周期也相应发生了变化：至日月份的风速和云量增加，而春分月份的风速和云量减少。在哈雷，没有明显的长期温度趋势是可检测的，这解释了观察到的季节性温度周期的变化。在法拉第，年平均风速和云量与SAO强度呈负相关，因此最近两者都有所增加。根据风速和温度变化之间的相关性，我们估计“背景”（独立于环流变化）南极变暖趋势为每世纪1.29±0.48°C。版权所有© 2000皇家气象学会
The interactions between the semi-annual oscillation (SAO), near-surface wind speed and cloudiness at seven Antarctic stations are described, as is how near-surface temperature is affected. A firmly established half-yearly wave, in both the mean annual cycle of wind speed and of cloudiness, was found at two stations with limited local disturbances: Halley and Faraday. Following a significant weakening of the SAO since the late 1970s, the annual cycles of wind speed and cloudiness at these stations have changed accordingly: increased wind speed and cloudiness in solstitial months and a decrease in the equinoctial months. At Halley, where no significant long-term temperature trends are detectable, this explains the observed changes in the seasonal temperature cycle. At Faraday, annual mean wind speed and cloudiness are negatively correlated to SAO strength, and as a result both have recently increased. Based on the correlation between wind speed and temperature changes, we estimate a ‘background’ (independent of circulation changes) Antarctic warming trend of 1.29±0.48°C per century. Copyright © 2000 Royal Meteorological Society