Estimating emissions and concentrations of road dust aerosol over China using the GEOS-Chem model

摘要

本文利用嵌套版本的GEOS-Chern和美国环保署推荐的AP-42经验公式,估算了2006至2011年中国地区的道路扬尘排放并模拟了中国地区的道路扬尘浓度.多年平均的道路扬尘年排放量为2331.4 kt,且在中国东部地区的排放量要大于西部.由于降水月变f化的影响,中国地区道路扬尘月排放量在12月最大而在6月最小.由于道路长度和车辆保有量逐年增加,2006-2011年期间,中国、京津唐、珠江三角洲和长江三角洲地区道路扬尘年排放量分别增加了260％、239％、266％和59％,这使得道路扬尘浓度在这些区域分别增加了233％、243％、273％和100％.%Paved road dust is one of the most important aerosols in China.The authors estimated road dust emissions using an empirical model (AP-42 model) developed by the U.S.Environmental Protection Agency,and simulated road dust concentrations over China for the years 2006-2011 using the GEOS-Chem model.The annual road dust emissions amount averaged over 2006-2011 is estimated to be 2331.4 kt,with much higher emissions in eastern China than in western China.Because of heavy traffic and a dense road network,emissions are high over Beijing-Tianjin-Tanggu (BTT),Henan Province,and Shandong Province.Meanwhile,emissions are calculated to be 459.1,112.0,and 102.7 kt,respectively,over BTT,the Pearl River Delta (PRD) region,and the Yangtze River Delta (YRD).Due to the monthly variation of precipitation,road dust emissions over China are simulated to be highest in December and lowest in June.The highest annual mean road dust concentration is simulated to be 14.5 μg m-3 in Beijing.Over 2006-2011,because of the increases in road length and number of vehicles,annual road dust emissions for China as a whole,BTT,the PRD,and the YRD,are simulated to increase by 260％,239％,266％,and 59％,respectively,leading to 233％,243％,273％,and 100％ increases in road dust concentrations in these regions,respectively.Our results have important implications for air pollution control in China.