论文标题
北京蓝天的定义和长期变化
The Definition and Long-term Variations of Beijing Blue Days
论文作者
论文摘要
北京蓝天的现象首先发生在2015年6月11日，并在短时间内成为一个热门的社会话题。因此，北京的蓝天不仅是普通百姓想要的，而且是民族需求。在这项工作中，使用1980年和2014年期间日平均气象观察的数据，我们选择了定义北京蓝色日（BBI）的三个标准，其中不包含雨水，晴朗的天空和良好的干燥知名度，准确性为73.4％。我们的研究发现，BEIJING份额在BTH地区的增长率最高，并且是2.66 d/2.66 d的增长率。最大的季节平均水平和最高加速度在冬季总BBI和连续BBI天出现，最少的是夏季，而北京蓝色在一月份最常出现。 BBI在年度范围内与相对湿度和无雨日有关，但在不同的季节不同。
The phenomenon of Beijing Blue days first occurs on June 11, 2015, and become a hot society topic in a short time. Thus, Beijing's blue day is not only what ordinary people desire but national needs. In this work, using the data of daily average meteorological observations during 1980 and 2014, we select three standards for defining Beijing blue day (BBI), which contain no rain, clear sky, and great dry visibility, and the accuracy is 73.4%.Our study finds that Beijing shares the most significant acceleration in the BTH region, with a growth rate of 2.66 d/year. The greatest seasonal average and the maximum acceleration rate appear in winter for total BBI and continuous BBI days, the least is in summer, while Beijing blue appears most frequently in January. BBI is more related to relative humidity and rainless day on an annual scale, but different in different seasons.
