Anomalies and Fluctuations of Near-surface Air Temperature at Tianhuangping (Zhejiang), China, Produced by the Longest Total Solar Eclipse of the 21st Century Under Cloudy Skies
Anomalies and Fluctuations of Near-surface Air Temperature at Tianhuangping (Zhejiang), China, Produced by the Longest Total Solar Eclipse of the 21st Century Under Cloudy Skies
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DOI：
10.1088/1538-3873/abb2f9
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发表时间：
2019-05
影响因子：
3.5
通讯作者：
M. A. Peñaloza-Murillo;M. Roman;J. Pasachoff
中科院分区：
文献类型：
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作者：
M. A. Peñaloza-Murillo;M. Roman;J. Pasachoff
在日全食期间，太阳圆盘被月球圆盘阻挡，在表面产生瞬间和强烈的能量下降。这种能量的损失导致地表附近的空气温度降低。任何人在一个完全晴朗的天空下，伴随着日全食（TSE）的进行，都会感觉到一种冷却，其最小值在全食后几分钟达到。这种温度下降被称为异常，这种延迟被称为热滞后。在TSE期间，气温不仅在幅度上而且在时间上都有明显的变化，这取决于天气和地理条件。如果日食部分或全部被云遮挡，就会对热滞后产生一些影响。在晴朗的天空下，温度响应滞后于太阳通量的变化，正如人们在TSE中所预期的那样;然而，在多云的天空下，这种滞后可以在部分阶段的早期和/或后期阶段逆转。在日食期间，太阳对月球表面的正常加热被破坏，从而驱动了靠近月球表面的空气层的湍流运动。2009年在中国举行的东京证交所提供了一个机会，让我们看看这次日食造成的这种扰动。在本文中，第二个系列的三个，我们分析了近地表的空气温度响应，在三个不同的高度在地面上，记录由威廉姆斯学院远征的气象条件下，多云的天空在2009年7月22日，在天荒坪（浙江），中国21世纪世纪最长的日全食。通过应用本系列第一篇论文中发表的研究，我们对太阳辐射和气温之间的关系进行了分析，其中我们评估了云量对估计该站点整个现象对全球太阳辐射的影响的贡献。对这种响应的分析包括线性和绝对负异常以及波动，这是通过统计研究进行的，以获得后者产生的对流活动的信息。通过方差分析和残差分析，研究了湍流产生的脉动。结果表明，这两个扰动的稳定减少和恢复，与其他研究这次日全食的结果一致。
During a total eclipse of the Sun, the solar disk blocked by the lunar disk produces an instant and strong decline of energy at the surface. This loss of energy leads to a decreasing air temperatures near the surface. Anyone under a completely clear sky, with a total solar eclipse (TSE) in progress, feels a cooling, whose minimum is reached a few minutes after totality. This drop in temperature is known as an anomaly and this delay is called thermal lag. During a TSE air temperature changes appreciably not only in magnitude but also in timing, depending on weather and geographical conditions. If the eclipse is partially or totally obscured by clouds, some effects are produced on the thermal lag. Under clear skies, the temperature response lags behind the change in solar flux as one expects in TSE; however, under cloudy skies, the lag can reverse in early and/or late stages of partial phases. The normal heating of the surface by the Sun, which drives turbulent motion in the air layer near the surface, is disrupted during the eclipse. The 2009 TSE in China provided an opportunity to have a look at these kinds of perturbations caused by this eclipse. In this paper, the second of a series of three, we analyze the near-surface air temperature response, at three different heights over the ground, recorded by the Williams College expedition under meteorological conditions characterized by cloudy skies during the longest total solar eclipse of the 21st century on 2009 July 22, at Tianhuangping (Zhejiang), China. An analysis of the relationship between solar radiation and air temperature was made by applying a study previously published in the first paper of this series in which we evaluated the cloudiness contribution in estimating the impact on global solar radiation throughout this phenomenon at that site. The analysis of this response includes linear and absolute negative anomalies as well as fluctuations, which was undertaken through a statistical study to get information on the convection activity produced by the latter. The fluctuations generated by turbulence were studied by analyzing variance and residuals. The results, indicating a steady decrease and recovery of both perturbations, were consistent with those published by other studies for this total solar eclipse.