Long-term spatiotemporal variations of ammonia in the Yangtze River Delta region of China and its driving factors  

作　　者：Jingkai Xue Chengzhi Xing Qihua Li Shanshan Wang Qihou Hu Yizhi Zhu Ting Liu Chengxin Zhang Cheng Liu 

机构地区：[1]School of Environmental Science and Optoelectronic Technology,University of Science and Technology of China,Hefei 230026,China [2]Key Lab of Environmental Optics&Technology,Anhui Institute of Optics and Fine Mechanics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China [3]Department of Precision Machinery and Precision Instrumentation,University of Science and Technology of China,Hefei 230026,China [4]Anhui Institute of Optics and Fine Mechanics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China [5]Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes,University of Science and Technology of China,Hefei 230026,China [6]Institute of Physical Science and Information Technology,Anhui University,Hefei 230601,China [7]Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention(LAP3),Department of Environmental Science and Engineering,Fudan University,Shanghai 200438,China [8]School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,China [9]School of Environmental Science and Engineering,Suzhou University of Science and Technology,Suzhou 215009,China

出　　处：《Journal of Environmental Sciences》2025年第4期202-217,共16页环境科学学报(英文版)

基　　金：supported by the Joint Funds of the National Natural Science Foundation of China(No.U21A2027);the New Cornerstone Science Foundation through the XPLORER PRIZE(2023-1033).

摘　　要：This study focuses on the spatiotemporal distribution,urban-rural variations,and driving factors of ammonia Vertical Column Densities(VCDs)in China’s Yangtze River Delta region(YRD)from 2008 to 2020.Utilizing data from the Infrared Atmospheric Sounding Interfer-ometer(IASI),Generalized Additive Models(GAM),and the GEOS-Chem chemical transport model,we observed a significant increase of NH_(3)VCDs in the YRD between 2014 and 2020.The spatial distribution analysis revealed higher NH_(3)concentrations in the northern part of the YRD region,primarily due to lower precipitation,alkaline soil,and intensive agricul-tural activities.NH_(3)VCDs in the YRD region increased significantly(65.18%)from 2008 to 2020.The highest growth rate occurs in the summer,with an annual average growth rate of 7.2%during the period from 2014 to 2020.Agricultural emissions dominated NH_(3)VCDs during spring and summer,with high concentrations primarily located in the agricultural areas adjacent to densely populated urban zones.Regions within several large urban areas have been discovered to exhibit relatively stable variations in NH_(3)VCDs.The rise in NH_(3)VCDs within the YRD region was primarily driven by the reduction of acidic gases like SO_(2),as emphasized by GAM modeling and sensitivity tests using the GEOS-Chem model.The concentration changes of acidic gases contribute to over 80%of the interannual variations in NH_(3)VCDs.This emphasizes the crucial role of environmental policies targeting the reduction of these acidic gases.Effective emission control is urgent tomitigate environmental hazards and secondary particulate matter,especially in the northern YRD.

关 键 词：Yangtze River Delta AMMONIA Spatiotemporal distribution Driving factors 

分 类 号：X52[环境科学与工程—环境工程]