北京地区大气氨时空变化特征

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摘要在北京城区和上甸子本底地区分别开展了为期3a和1a的NH₃在线观测，并结合风向、风速、温度、相对湿度等气象因素的变化特征，分析了北京地区NH₃浓度水平、年季特征及影响因素.结果发现，北京城区和本底地区的NH₃年均浓度分别为（32.5±20.8）×10^-9V/V和（11.6±10.3）×10^-9V/V，北京城区的NH₃浓度高于大多数国内外主要城市和地区的NH₃浓度水平.城区和本底地区NH₃浓度年变化特征为夏季高，分别为（34.1±6.8）×10^-9V/V和（11.1±2.2）×10^-9V/V，冬季低，分别为（19.7±9.3）×10^-9V/V和（2.4±0.6）×10^-9V/V.NH₃的日变化特征受气象因素影响明显，其结果表明，春季城区NH₃浓度峰值出现在15：00，而本底地区受西南风影响在20：00达到峰值；夏季城区NH₃浓度最高值在7：00出现，本底地区则呈现双峰值（分别在09：00和22：00）；秋季城区和本底地区的日变化规律一致，均在22：00出现峰值；冬季城区的峰值出现时间晚于本底地区，峰值分别出现在23：00和20：00.西南风是造成本底地区NH₃浓度升高的主要原因，春季和夏季，随着西南向风速的增大，NH₃浓度显著升高.城区的NH₃浓度则主要受到局地排放的影响.浓度权重轨迹法的研究结果发现，北京、天津、河北及河南北部地区是影响北京地区大气NH₃的主要源区.

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	刘湘雪
	蒲维维
	马志强
	林伟立
	韩婷婷
	李颖若
	周礼岩
	石庆峰

关键词 ： NH₃, 上甸子本底站, 区域输送, 拉格朗日综合单粒子轨道(HYSPLIT)模型, 浓度权重轨迹(CWT)

Abstract：Considering the variables in meteorological characterizations including wind direction, wind speed, temperature and relative humidity, a three-year and one-year online observation of ammonia was conducted at Beijing urban sites and Shangdianzi background station separately, for analyzing the temporal and spatial changes of NH₃ concentration and influencing factors in Beijing. The average annual NH₃ concentration in Beijing urban was (32.5±20.8)×10^-9V/V, which was significantly higher than that in background station[(11.6±10.3)×10^-9V/V] and many major cities and regions both in China and foreign countries. The seasonal variation characteristics exhibited that the average concentrations of NH₃ were higher in summer than those of in winter, with giving (34.1±6.8)×10^-9V/V and (11.1±2.2)×10^-9V/V in summer, and (19.7±9.3)×10^-9V/V and (2.4±0.6)×10^-9V/V in winter, in terms of Beijing urban and background area, respectively. Moreover, the effect of meteorological factors on daily variation of NH₃ is significant. In spring, the peak value of NH₃ concentration in urban appeared at 15:00, which was earlier than that at 20:00 in background area under the influence of southwest wind. In contrast, the time for reaching highest concentration in urban area delayed in winter and was slightly later than that of background area, with cresting at 23:00 and 20:00 respectively. During summer, the NH₃ concentration in urban area peaked at 7:00, whereas dual crest value of NH₃ concentration in background area occurred twice at 09:00 and 22:00. In autumn, urban and background area had presented the same diurnal variation with peaking approximately at 22:00. The southwest wind was the main reason that leads to the changes of NH₃ concentration in the background area, where the concentration rise remarkably with the increase of southwest wind speed in spring and summer. However, concentration weighted trajectory analysis (CWT) drove that surrounding areas involving Beijing, Tianjin, Hebei and northern Henan contributed to the varying concentrations in Beijing urban areas, were the main sources of NH₃ affecting Beijing urban areas and background stations.

Key words： NH₃ Shangdianzi background station regional transportation hybrid single-particle Lagrangian integrated trajectory (HYSPLIT) model concentration weighted trajectory(CWT)

收稿日期: 2021-01-28

PACS:

X511

基金资助:国家重点研发计划项目（2016YFC0201902）；国家自然科学基金资助项目（42005094）；北京市科委项目（Z181100005418016）

通讯作者: 蒲维维,正高级工程师,wwpu@ium.cn E-mail: wwpu@ium.cn

作者简介: 刘湘雪(1991-),女,北京人,工程师,硕士,研究方向为大气污染监测预报及数值模拟.发表论文5篇.

引用本文:

刘湘雪, 蒲维维, 马志强, 林伟立, 韩婷婷, 李颖若, 周礼岩, 石庆峰. 北京地区大气氨时空变化特征[J]. 中国环境科学, 2021, 41(8): 3473-3483. LIU Xiang-xue, PU Wei-wei, MA Zhi-qiang, LIN Wei-li, HAN Ting-ting, LI Ying-ruo, ZHOU Li-yan, SHI Qing-feng. Study on the temporal and spatial variation of atmospheric ammonia in Beijing. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(8): 3473-3483.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2021/V41/I8/3473

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