云南及周边地区闪电活动和其他干扰因素对NO_(2)的协同影响  

Synergistic Effects of Lightning Activity and Other Disturbance Factors on NO_(2) in Yunnan and Its Surrounding Areas

作　　者：赵平伟 李立印 王佳妮 任菊章 陈静[1] 张云秋 ZHAO Pingwei;LI Liyin;WANG Jiani;REN Juzhang;CHEN Jing;ZHANG Yunqiu(Lincang Meteorological Bureau of Yunnan Province,Lincang 677099;Research Center for Disastrous Weather over Hengduan Mountains and Low-Latitude Plateau,China Meteorological Administration,Kunming 650034;Yunnan Institute of Meteorological Science,Kunming 650034)

机构地区：[1]云南省临沧市气象局,临沧677099 [2]中国气象局横断山区(低纬高原)灾害性天气研究中心,昆明650034 [3]云南省气象科学研究所,昆明650034

出　　处：《气象科技》2024年第5期733-742,共10页Meteorological Science and Technology

基　　金：国家可持续发展创新议程示范区专项(202104AC100001-A14);国家自然科学基金项目(21966016);国家重点研发计划(2019YFC0214405)共同资助。

摘　　要：以2018年9月至2022年8月为研究时段,采用多种统计方法对滇西南及周边生物质燃烧高发区(A区)、滇中人类活动强度较大的城市群区(B区)2—4月和6—8月闪电活动及其他干扰因素对NO_(2)的影响进行对比分析。结果表明:①2—4月A、B区NO_(2)柱浓度分别与火点数和人为CO_(2)排放在空间上存在显著正相关,但与闪电次数呈显著负相关。②闪电活动多伴有明显降雨(R≥1 mm),闪电活动较弱时,降雨对地面NO_(2)的湿沉降作用明显,较强的闪电活动下降雨的湿沉降仍无法完全抵消闪电对地面NO_(2)浓度增长的贡献。③6—8月初次出现闪电时A、B区地面NO_(2)浓度前6 h逐时增加,之后3 h则逐时缓慢减小。④闪电日A、B区地面NO_(2)浓度整体高于无闪电日,生物质燃烧强度、降雨强度和大气边界层高度等变化均会对其产生明显影响。NO_(2)is the common precursor of the secondary conversion of PM 2.5 and O 3.Understanding its change characteristics and influencing factors is of great significance for the collaborative treatment of PM 2.5 and O 3.Based on the VLF/LF three-dimensional lightning location monitoring system,SNPP/VIIRS satellite fire point data,NO_(2)column density in Sentinel-5P NRTI NO_(2)data products and other data,using various statistical methods,selecting February to April with high NO_(2)density and June to August with frequent lightning activities,this paper compares and analyses the influence of lightning activities on NO_(2)density in region A(96.5°-102°E,20.5°-24°N)with high biomass burning in southwest Yunnan and its surrounding areas and region B(102°-104°E,24°-26°N)with high human activities in central Yunnan.The results show that:(1)There are obvious differences in the spatial and temporal distribution of the number of lightning and NO_(2)column density in region A and region B.The NO_(2)column density outside area A is higher than that in China,but the distribution of lightning times is the opposite.The NO_(2)column density in region B decreases from Kunming to the surrounding area,and the number of lightning is less and more.In the dry season(November to April of the next year),the concentration of NO_(2)density is higher,and the rainy season(May to October)is lower,and the number of lightning is opposite.(2)From February to April,the NO_(2)column density in region A and region B has a significant positive spatial correlation with the number of fire points and anthropogenic CO_(2) emissions,respectively,but a significant negative correlation with the number of lightning.(3)Lightning activity is mostly accompanied by obvious rainfall(R≥1 mm).When the lightning activity is weak,the wet deposition effect of rainfall on the ground NO_(2)density is obvious,and the wet deposition effect of rain falling from the stronger lightning activity cannot completely offset the contribution of lightning to the increase o

关 键 词：闪电 NO_(2) 生物质燃烧 雨量 协同影响 

分 类 号：P427.3[天文地球—大气科学及气象学] P402