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首页> 外文期刊>Annals Of Geophysics >Effects of March 20, 2015, partial (~50%) solar eclipse on meteorological parameters in the urban area of Naples (Italy)
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Effects of March 20, 2015, partial (~50%) solar eclipse on meteorological parameters in the urban area of Naples (Italy)

机译：2015年3月20日，部分日偏食（〜50％）对那不勒斯（意大利）市区的气象参数的影响

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During the partial (~50%) solar eclipse occurred on March 20, 2015, morning, various meteorological parameters were monitored to study their evolution above the urban area of Naples, central Italy. The experimental conditions were optimal because of the clear sky situation all over Italy, and in Naples in particular. The eclipse last about 2 hours between 9:25:06 (UT+1, local Italian time) and 11:43:09 (local Italian time, UT+1). From the observation site, the incoming solar radiation diminished by about 50% at the eclipse peak at 10:32:18 (local Italian time, UT+1), as expected. On the contrary, the UV radiation diminished significantly less, about 25%. This frequency response was likely due to Rayleigh scattering. It suggests that about 50% of the UV radiation reaching the surface was direct light and 50% scattered light. During the eclipse, the urban surface temperature and humidity values stayed almost constant instead of increasing and decreasing, respectively, as predicted by their daily cycle. This result was used to estimate that the average emissivity of the city of Naples is about f = 0.86. The wind speed decreased significantly during the event while the atmospheric pressure stayed constant to decrease only after the eclipse. Finally, we propose a simple empirical method to approximately estimate the cooling effect of an eclipse, which meteorologists could use to correct the temperature model forecast that normally ignores the occurrence of an eclipse. Consistency of these results with the literature and its importance is briefly discussed.
机译：在2015年3月20日上午发生部分（约50％）日食期间，监测了各种气象参数以研究其在意大利中部那不勒斯市区以上的演变。由于整个意大利，尤其是那不勒斯的天空晴朗，因此实验条件是最佳的。日食在9:25:06（UT + 1，意大利当地时间）和11:43:09（意大利当地时间，UT + 1）之间持续约2小时。正如预期的那样，从观测点出发，在10:32:18（当地意大利时间UT + 1）的月食峰值处，入射的太阳辐射减少了约50％。相反，紫外线辐射的衰减明显较小，约为25％。该频率响应可能是由于瑞利散射引起的。这表明到达表面的紫外线辐射中约50％是直射光，而50％是散射光。在日食期间，城市表面温度和湿度值几乎保持恒定，而不是如其每日周期所预测的那样分别升高和降低。该结果用于估计那不勒斯市的平均发射率约为f = 0.86。在此期间，风速显着下降，而大气压保持恒定，仅在日食后才下降。最后，我们提出一种简单的经验方法来近似估计日食的降温效果，气象学家可以使用该方法来校正通常忽略日食发生的温度模型预报。简要讨论了这些结果与文献的一致性及其重要性。

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