A note on apparent solar time and the seasonal cycle of atmospheric solar tides
A note on apparent solar time and the seasonal cycle of atmospheric solar tides
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关于视太阳时和大气太阳潮汐季节周期的注记
DOI：
10.1002/qj.3076
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发表时间：
2017
影响因子：
8.9
通讯作者：
Sakazaki Takatoshi
中科院分区：
文献类型：
--
作者：
Hamilton Kevin;Sakazaki Takatoshi
大气场的观测数据和综合模型模拟数据通常可以在一天中固定的平均太阳时获得，这很方便，因为名义上的“平均太阳”每天正好 24 小时绕地球运行一圈。本文报告了对平均太阳时数据的校正效果的简单调查，以解释实际（或“视”）太阳与平均太阳之间的位置差异，重点是描述大气潮汐振荡的特征。特别是，我们发现赤道附近表面压力的半日大气潮汐振荡阶段的年周期几乎完全可以用平太阳时和视太阳时之间的差异来解释。这一结果在原始气压观测以及几个全球再分析数据集中得到了证实。
Both observations and comprehensive model simulation data of atmospheric fields are generally available at fixed Mean Solar Times through the day, which is convenient as the notional ‘mean sun’ progresses around the Earth each day in exactly 24 h. This article reports on a simple investigation of the effect of correcting data taken in Mean Solar Time to account for the difference in position between the actual (or ‘apparent’) sun and the mean sun, with a focus on characterizing atmospheric tidal oscillations. In particular, we found that the annual cycle in the phase of the semidiurnal atmospheric tidal oscillation of surface pressure near the Equator is almost entirely explained by the difference between Mean Solar Time and Apparent Solar Time. This result was confirmed in raw barometric observations as well as in several global reanalysis datasets.