Even in the United Kingdom, with its mid-latitude oceanic climate, solar energy is of increasing importance for maintaining energy supplies and moving towards net zero. Quantification of the solar resource therefore is critical. Measurements of sunshine duration, which are strongly correlated with insolation, indicate a continuation of a brightening trend first identified for other locations 20 years ago. Although there is likely to be some control by atmospheric pollution, decreasing cloudiness may be the main determinant. Application of Jenkinson–Collison surface synoptic indices indicates a strong synoptic control on sunshine duration but does not account for the observed trend in sunshine. This suggests that further research is warranted on circulation-related cloud attributes.

中文翻译：

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英国阳光明媚的气候

即使在具有中纬度海洋性气候的英国，太阳能对于维持能源供应和迈向净零能源也越来越重要。因此，太阳能资源的量化至关重要。日照时长的测量与日照量密切相关，表明 20 年前首次在其他地点发现的增亮趋势仍在继续。尽管大气污染可能会起到一定的控制作用，但云量的减少可能是主要的决定因素。詹金森-柯里森表面天气指数的应用表明对日照持续时间有很强的天气控制，但没有考虑到观测到的日照趋势。这表明有必要对与环流相关的云属性进行进一步的研究。