孙萌宇^1,3,,
郄秀书^1,3,,,
刘冬霞¹,
YoavYair²,
夏祥鳌^1,3,
袁善锋^1,3,
王东方¹,
卢晶雨^1,3,
AbhaySrivastava¹,
DidierNtwali¹
1. 中国科学院大气物理研究所中层大气与全球环境探测重点实验室, 北京 100029
2. School of Sustainability, Interdisciplinary Center (IDC) Herzliya
3. 中国科学院大学地球与行星科学学院, 北京 100049

基金项目: 国家自然科学基金国际(地区)合作与交流项目(41761144074), 国家自然科学基金面上项目(41875007)资助


详细信息

作者简介: 孙萌宇, 主要从事大气环境和大气电学研究.E-mail:sunmengyu16@mails.ucas.edu.cn

通讯作者: 郄秀书, 研究员, 主要从事大气电学研究.E-mail:qiex@mail.iap.ac.cn

中图分类号: P401

收稿日期:2019-03-09
修回日期:2019-09-18
上线日期:2020-05-05

Analysis of potential effects of aerosol on lightning activity in Beijing metropolitan region

SUN MengYu^1,3,,
QIE XiuShu^1,3,,,
LIU DongXia¹,
YOAV Yair²,
XIA XiangAo^1,3,
YUAN ShanFeng^1,3,
WANG DongFang¹,
LU JingYu^1,3,
ABHAY Srivastava¹,
DIDIER Ntwali¹
1. Key Laboratory of Middle Atmosphere and Global Environment Observation, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
2. School of Sustainability, Interdisciplinary Center(IDC) Herzliya
3. College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China


More Information

Corresponding author: QIE XiuShu,E-mail:qiex@mail.iap.ac.cn

MSC: P401

--> Received Date: 09 March 2019
Revised Date: 18 September 2019
Available Online: 05 May 2020


摘要
摘要:基于2015—2017年北京闪电定位网（BLNET）总闪资料与35个自动空气质量监测站PM_2.5数据，分析了北京地区（39.5°N—41.0°N，115.0°E—117.5°E）夏季（6—8月）闪电活动与PM_2.5的时空分布特征，同时针对117次雷暴天气，探讨了气溶胶浓度变化对闪电活动的可能影响.结果表明：PM_2.5浓度及总闪密度均呈现自西北向东南升高的空间分布特征.闪电峰值在污染背景下出现的时间（19：00LT）晚于清洁背景下（15：00LT）约4 h，且总闪百分比（~20%）可达清洁背景下（~9%）的两倍.对雷暴前1~4 h的PM_2.5浓度与时间窗（12：00—22：00LT）内总闪数目的中位数进行相关分析，发现PM_2.5浓度低于130 μg·m^-3时，PM_2.5与总闪数存在明显正相关，此时气溶胶可能通过影响云微物理过程进而影响雷暴的对流发展，增强闪电活动；PM_2.5大于150 μg·m^-3时，总闪数随PM_2.5浓度的增加呈减少趋势，可能的原因是高气溶胶浓度下地面太阳辐射显著下降，对流活动受到抑制，导致闪电活动减少.当PM_2.5浓度在130~150 μg·m^-3时，两者关系不明显.
关键词: 闪电活动/
气溶胶/
微物理作用/
辐射效应

Abstract:Based on the lightning data from Beijing Lightning Network (BLNET) and PM_2.5 data from 35 automatic air-monitoring stations, spatiotemporal distributions of total lightning activities and aerosols have been analyzed in Beijing (39.5°N—41.0°N, 115.0°E—117.5°E). The response of lightning activities to aerosols is further investigated for a total of 117 thunderstorm days. The results indicated both spatial distributions of lightning density and pollutant demonstrated a gradual increase from northwest to southeast of Beijing metropolitan region. The peak lightning activity under relatively polluted condition occurred at 19:00 LT (Local Time), 4 hours later than that (15:00LT) under relatively clean condition, higher aerosol concentration enhanced the percentage of total flashes by a factor of ~2. Correlation analysis of PM_2.5 prior to the occurrence of thunderstorms to lightning density showed a significant positive correlation when PM_2.5 lower than 130 μg·m^-3. This is likely because aerosols enhanced lightning activities by affecting the convective activities through microphysical processes. On the contrary, as PM_2.5 exceeded 150 μg·m^-3, total flashes showed a negative relationship to PM_2.5. This might be attributed to lower solar radiation reaching the surface as a result of increasing aerosol loading. When PM_2.5 ranged from 130 and 150 μg·m^-3, the correlation between aerosols and lightning was very weak, which might be caused by the balance of microphysical and radiative effects of aerosols.
Key words:Aerosol/
Lightning activity/
Radiative effect/
Microphysical effect



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