通过管理生物源挥发性有机化合物来减少中国夏季臭氧浓度.pdf

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1、Managing Biogenic VOC to reduce summertime ozone in ChinaAlex GuentherDistinguished ProfessorEarth System Science DepartmentUniversity of California,Irvinealex.guentheruci.eduYRD Clean Air ForumShanghai,China,August 28,2025BVOC sampling site:YRD 2009Photo:A.Guenther-pineneHumuleneWhat are Biogenic V

2、olatile Organic Compounds(BVOCs)?Isoprene:half of global total BVOCAnthropogenicoctanollimonenelinaloolCitronellolPineHopsOakBiogenic:produced by living organisms(but can be modified by human activities)Volatile:gas phase(but not all are completely in the gas phase)Organic Compounds:contains CH cova

3、lent bonds(but can include others:O,S,N,Cl)Why do organisms emit these Biogenic Volatile Organic Compounds(BVOCs)?Signaling and defense/stressDudareva et al.20061.Beneficial roles2.Stress can increase BVOC(but there is a limit)Ozone is limited by VOC(based on MEGAN biogenic VOC emission estimates)“F

4、uture”predictions of 2020 ozone concentrations in Central Eastern ChinaJuly 2000ozoneShandongHebeiHenanAnhuiJiangsuWang et al.2005Anthropogenic and biogenic VOC emissions were both 4500 kTons A slight decrease in ozone is predicted(associated with increases in NOx).This assumes that biogenic VOC doe

5、s not change but we noted that is likely that there will be substantial increases in biogenic VOC due to climate and landcover change.July 2020Anthropogenic VOC was assumed to increase by 50%and NOx by 150%Cao et al.2022BVOC emission increase in China during this time period:1981 to 2018 BVOC impact

6、 on MDA8 ozone is up to 20 to 30 ppb-including in eastern YRDHuang et al.2024Sensitivity of YRD ozone mitigation strategies to BVOC emission estimatesMDA8 ozone concentrationsUncertainties in BVOC emission estimates impact ozone predictions Sensitivity of YRD ozone mitigation strategies to BVOC emis