近50年大兴区雾、霾气候特征及影响因素分析
发布时间：2019-04-10 16:52
【摘要】：文章利用北京市大兴区国家一般气象观测站1964-2013年50 a的历史地面气象观测资料,系统地分析了大兴区雾、霾天气气候变化特征及气温、风、相对湿度、最长连续无降水日数这些趋势变化特征对大兴当地雾、霾过程的影响。结果表明,雾日数变化趋势总体来说较平稳,霾日数波动性变化趋势比较明显;大兴区雾、霾日数在初秋及冬季较多,春季最少。从长期气象条件来看,雾、霾天气时,近地层主导风向多为偏南风,风速较非雾、霾天气时低了1.0 m/s以上,且静风所占频率较高;从1980-2014年北京地区霾现象发生时的相对湿度空间分布图来看,大兴、房山、通州相对湿度相比其他区域更大,维持在70%以上;逐月最长连续无降水日数与雾、霾出现次数的单谷型变化趋势较为一致。另外,1964-2013年气温每10 a增高0.4℃,平均风速减少速率为每10 a 0.2 m/s,气温和风速的这种变化趋势也不利于大兴地区污染物的扩散。
[Abstract]:Based on the historical ground meteorological observation data of the general meteorological observation station in Daxing District, Beijing, from 1964 to 2013, the paper systematically analyzed the characteristics of the climate change and the temperature, wind and relative humidity of the fog and haze in the Daxing District. The change of the longest continuous no-precipitation days on the local fog and the haze process in Daxing. The results show that the change trend of the fog days is relatively stable, and the change trend of the haze days is more obvious; the fog and haze days in the Daxing District are more and more in the early autumn and in the winter, and the spring is the least. From the long-term meteorological conditions, in the fog and haze weather, the dominant wind direction of the near-earth formation is the south-south wind, the wind speed is higher than that of the non-fog and the haze weather is less than 1.0m/ s, and the frequency of the static wind is higher; and from the relative humidity space distribution map when the haze phenomenon in the area of 1980-2014 is taken, Daxing and Fangshan, Compared with other regions, the relative humidity in Tongzhou is more than 70%; the single-grain trend with the longest continuous no-precipitation days and the number of fog and haze is more consistent. In addition, the air temperature in 1964-2013 is increased by 0.4 鈩，
本文编号：2455961
[Abstract]:Based on the historical ground meteorological observation data of the general meteorological observation station in Daxing District, Beijing, from 1964 to 2013, the paper systematically analyzed the characteristics of the climate change and the temperature, wind and relative humidity of the fog and haze in the Daxing District. The change of the longest continuous no-precipitation days on the local fog and the haze process in Daxing. The results show that the change trend of the fog days is relatively stable, and the change trend of the haze days is more obvious; the fog and haze days in the Daxing District are more and more in the early autumn and in the winter, and the spring is the least. From the long-term meteorological conditions, in the fog and haze weather, the dominant wind direction of the near-earth formation is the south-south wind, the wind speed is higher than that of the non-fog and the haze weather is less than 1.0m/ s, and the frequency of the static wind is higher; and from the relative humidity space distribution map when the haze phenomenon in the area of 1980-2014 is taken, Daxing and Fangshan, Compared with other regions, the relative humidity in Tongzhou is more than 70%; the single-grain trend with the longest continuous no-precipitation days and the number of fog and haze is more consistent. In addition, the air temperature in 1964-2013 is increased by 0.4 鈩，
本文编号：2455961
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