Eclipse-induced wind changes over the British Isles on the 20 March 2015.
Eclipse-induced wind changes over the British Isles on the 20 March 2015.
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DOI：
10.1098/rsta.2015.0224
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发表时间：
2016-09-28
期刊：
影响因子：
--
通讯作者：
Harrison RG
中科院分区：
文献类型：
--
作者：
Gray SL;Harrison RG
不列颠群岛受益于密集的气象观测网络，使人们能够深入了解日食事件对近地表风场的尚未解决的影响。2015年3月20日日食的近地表影响是通过比较气象局的业务天气预报模型（不知道日食）的输出与两个气象网络的数据得出的：气象局的陆地地面站（MIDAS）网络和维萨拉运营的路边测量网络。天气演变的相对计算揭示了几乎普遍归因于日食事件的冷却和相对湿度的增加。此外，在已经很弱的风速下，风速减缓了约2节，在英格兰中部晴朗的天空下，风向倒退了约20°，这也是日食事件的原因。风速的减弱与先前报道的日食事件期间边界层稳定性一致。风向的变化以前被归因于一个大规模的“日食引起的冷芯气旋”，山坡流，海风强度的变化。这里提出了一个新的解释类比日落时夜间风的变化，并显示预测方向的变化与观察到的一致。这篇文章是“2015年英国日食刺激的日食大气效应”主题问题的一部分。
The British Isles benefits from dense meteorological observation networks, enabling insights into the still-unresolved effects of solar eclipse events on the near-surface wind field. The near-surface effects of the solar eclipse of 20 March 2015 are derived through comparison of output from the Met Office’s operational weather forecast model (which is ignorant of the eclipse) with data from two meteorological networks: the Met Office’s land surface station (MIDAS) network and a roadside measurement network operated by Vaisala. Synoptic-evolution relative calculations reveal the cooling and increase in relative humidity almost universally attributed to eclipse events. In addition, a slackening of wind speeds by up to about 2 knots in already weak winds and backing in wind direction of about 20° under clear skies across middle England are attributed to the eclipse event. The slackening of wind speed is consistent with the previously reported boundary layer stabilization during eclipse events. Wind direction changes have previously been attributed to a large-scale ‘eclipse-induced cold-cored cyclone’, mountain slope flows, and changes in the strength of sea breezes. A new explanation is proposed here by analogy with nocturnal wind changes at sunset and shown to predict direction changes consistent with those observed. This article is part of the themed issue ‘Atmospheric effects of solar eclipses stimulated by the 2015 UK eclipse’.
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