Study On The Synergistic Effect Of Carbon Dioxide Emission Reduction On Air Quality Improvement In Jiangsu Provinc

The peak of carbon emission and the standard of air quality are the hot issues in the research of atmospheric environment.Based on the data of statistical yearbook and government announcement,this study constructs the greenhouse gas emission inventory of 13prefecture-level cities in Jiangsu Province from 2010 to 2019,and further analyzes the synergistic relationship between greenhouse gas and air pollutant emissions to estimate the emission reduction response of air pollutants under different carbon reduction scenarios.Finally,the regional air quality numerical model WRF-Chem is used to simulate the synergistic gain of air quality improvement under the constraint of carbon peak.The results show that the greenhouse gas emission of Jiangsu Province is 711.0-885.1 Mt CO_2e（carbon dioxide equivalent）from 2010 to 2019,and most cities show a continuous upward trend,among which Suzhou,Nanjing and Xuzhou have the highest emission levels of167.44-196.36,65.54-108.60 and 76.09-102.98 Mt CO_2erespectively,while Suqian,Lianyungang and Yangzhou have the lowest emissions of 12.99-20.86,17.76-35.85 and33.00-36.77 Mt CO_2e,respectively.Greenhouse gas emissions are dominated by CO₂,accounting for 66.3%-99.0%,and most cities account for more than 90%,followed by CH₄（0.62%-15.05%）.The main sources of greenhouse gas emissions are energy activities（60.79%-93.83%）,followed by industrial production processes（～10%）.Further,according to the energy economic characteristics and future development plan of Jiangsu Province,taking the carbon peak in 2030 as the constraint target,three types of CO₂emission reduction scenarios are designed based on the current situation in 2017,which are sector-wide coordinated emission reduction,priority energy emission reduction and priority industrial emission reduction,respectively.Taking the homologous correspondence of the emission industry as a bridge,this paper further analyzes the emission reduction response of air pollutants under different CO₂emission reduction scenarios.The results show that the emission reduction response of air pollutants is the most significant under the priority energy emission reduction scenario,and the emissions of major air pollutants SO₂,NO_xand PM_2.5can be reduced by 43.6%-57.0%（under the intensity of 40%CO₂emission reduction）.Finally,the WRF-Chem model is used to simulate and analyze the synergy gain of air quality in 13 cities in Jiangsu Province.The results show that the average annual PM_2.5concentration decreases significantly under the three carbon emission reduction scenarios,ranging from 3.1-21.1μg/m³,among which the sector-wide coordinated emission reduction has the most significant improvement on PM_2.5pollution(mainly because the PM_2.5emission reduction is the highest under the whole-sector cooperative emission reduction scenario).Under the 40%coordinated emission reduction efforts of the whole department,with the exception of Xuzhou and Suqian,the average annual PM_2.5concentration of most cities in Jiangsu Province can meet the national II standard（35μg/m³）.The change responses of PM₁₀,SO₂,NO₂and CO are similar to those of PM_2.5,but O₃pollution shows an upward trend in different degrees under the scenarios of priority energy and priority industry.