高纬度地区的过辐照度(云增强)事件

G. Yordanov, O. Midtgård, T. O. Saetre, Henrik Kofoed Nielsen, L. Norum
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引用次数: 25

摘要

与直觉相反,太阳辐照度在部分多云条件下达到峰值。即使在高纬度地区,云也能使阳光增加1.5倍以上。根据云的速度,爆发的时间从几秒到几分钟不等。以10毫秒的分辨率测量倾斜表面上的辐照度,可以对挪威南部几乎在海平面上的此类事件进行详细研究。2011年4月至9月的月最大值均超过1300 W/m2。慢速传感器的年最大值为1413 W/m2,而快速传感器的量程不足。2012年6月,峰值达到1528 W/m2。在赤道附近,已经观测到超过1800瓦/平方米的爆发。这些数字是惊人的,因为地外太阳辐照度在1月份达到峰值,约为1400瓦/平方米。这种现象主要归因于光学薄云(靠近太阳)的前向散射,在太阳盘周围5°范围内的角度更强。
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Overirradiance (cloud enhancement) events at high latitudes
Contrary to intuition, solar irradiance peaks at partially cloudy conditions. Clouds can boost sunlight by over 1.5 times, even at high latitudes. Depending on cloud velocity, the bursts last from seconds to minutes. Measuring irradiance on a tilted surface with 10-ms resolution allows for a detailed study of such events in Southern Norway, almost at sea level. All monthly maxima from April through September 2011 exceeded 1300 W/m2. The slow sensor registered an annual maximum of 1413 W/m2, while the fast sensor's range was found insufficient. A burst reaching 1528 W/m2 was registered in June 2012. Near the Equator, bursts exceeding 1800 W/m2 have been observed. These numbers are striking since the extraterrestrial solar irradiance peaks in January at about 1400 W/m2. The phenomenon is attributed mainly to forward scattering of light in optically thin clouds (adjacent to the sun), which is much stronger for angles within 5° around the solar disk.
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