Biogenic volatile organic compounds(BVOCs) in the atmosphere play important roles in the formation of ground-level ozone and secondary organic aerosol(SOA) in global scale and also in regional scale under some conditi...Biogenic volatile organic compounds(BVOCs) in the atmosphere play important roles in the formation of ground-level ozone and secondary organic aerosol(SOA) in global scale and also in regional scale under some condition due to their large amount and relatively higher reactivity.In places with high plant cover in the tropics and in China where air pollution is serious,the effect of BVOCs on ozone and secondary organic aerosols is strong.The present research aims to provide a comprehensive review about the emission rate,emission inventory, research methods,the influencing factors of BVOCs emissions,as well as their impacts on atmospheric environment quality and human health in recent years in Asia based on the summary and analysis of literatures.It is suggested to use field direct measurement method to obtain the emission rate and model method to calculate the emission amount.Several recommendations are given for future investigation and policy development on BVOCs emission.展开更多
Biogenic volatile organic compounds(BVOC s) have significant effects on atmospheric chemistry,ozone formation and secondary organic aerosol formation.Considering few investigations about BOVCs emissions in north China...Biogenic volatile organic compounds(BVOC s) have significant effects on atmospheric chemistry,ozone formation and secondary organic aerosol formation.Considering few investigations about BOVCs emissions in north China where is facing serious air pollution in recent years,emissions of various BVOCs from 24 dominant forest species in Beijing were measured from June to September in 2018,using a dynamic headspace sampling method.More than one hundred BVOCs in the collected samples were identified by using an automatic thermal desorption-gas chromatography/mass spectrometry,and their emission rates based on leaf biomass were calculated.Isoprene and monoterpenes were verified to be the dominant BVOCs emitted from the tree species,accounting for more than 50% of the total BVOCs.Generally,broad-leaved species displayed high isoprene emission rates,especially the Platanus occidentalis(21.36μg/(g·hr)),Robinia pseudoacacia(11.55μg/(g·hr)),and Lonicera maackii(9.17μg/(g·hr)),while coniferous species emitted high rates of monoterpenes,such as Platycladus orientalis(27.18μg/(g·hr)),Pinus griffithii(23.11μg/(g·hr)),and Pinus armandii(7.42μg/(g·hr)).High emission rates of monoterpenes from the broad-leaved species of Buxus megistophylla(13.07μg/(g·hr)) and Ligustrum uicaryi(5.74μg/(g·hr)),and high isoprene emission rate from the coniferous tree of Taxus cuspidata(5.86μg/(g·hr)) were also observed.The emission rates of sesquiterpenes from each tree were usually 10-100 times smaller than those of isoprene and monoterpenes.Additionally,relatively high emission rates of oxygenated volatile organic compounds and other alkenes than isoprene and monoterpenes were also found for several tree species.展开更多
Background:Biogenic volatile organic compounds(BVOCs)play an essential role in tropospheric atmospheric chemical reactions.There are few studies conducted on BVOCs emission of dominant forest species in the Jing-Jin-J...Background:Biogenic volatile organic compounds(BVOCs)play an essential role in tropospheric atmospheric chemical reactions.There are few studies conducted on BVOCs emission of dominant forest species in the Jing-Jin-Ji area of China.Based on the field survey,forest resources data and the measured standard emission factors,the Guenther model developed in 1993(G93)was applied in this paper to estimate the emission of BVOCs from several dominant forest species(Platycladus orientalis,Quercus variabilis,Betula platyphylla,Populus tomentosa,Pinus tabuliformis,Robinia pseudoacacia,Ulmus pumila,Salix babylonica and Larix gmelinii)in the Jing-Jin-Ji area in 2017.Then the spatiotemporal emission characteristics and atmospheric chemical reactivity of these species were extensively evaluated.Results:The results showed that the total annual BVOCs emission was estimated to be 70.8 Gg C·year^(−1),consisting 40.5%(28.7 Gg C·year^(−1))of isoprene,36.0%(25.5 Gg C·year^(−1))of monoterpenes and 23.4%(16.6 Gg C·year^(−1))of other VOCs.The emissions from Platycladus orientalis,Quercus variabilis,Populus tomentosa and Pinus tabulaeformis contributed 56.1%,41.2%,36.0% and 31.1%,respectively.The total BVOCs emission from the Jing-Jin-Ji area accounted for 61.9% and 1.8%in summer and winter,respectively.Up to 28.8% of emission was detected from Chengde followed by Beijing with 24.9%,that mainly distributed in the Taihang Mountains and the Yanshan Mountains.Additionally,the Robinia pseudoacacia,Populus tomentosa,Quercus variabilis,and Pinus tabulaeformis contributed mainly to BVOCs reaction activity.Conclusions:The BVOCs emission peaked in summer(June,July,and August)and bottomed out in winter(December,January,and February).Chengde contributed the most,followed by Beijing.Platycladus orientalis,Quercus variabilis,Populus tomentosa,Pinus tabulaeformis and Robinia pseudoacacia represent the primary contributors to BVOCs emission and atmospheric reactivity,hence the planting of these species should be reduced.展开更多
基金supported by the grants from Beijing Municipal Science and Technology Project(Nos.Z181100005318003 and Z181100005418015)the National Research Program for Key Issues in Air Pollution Control(No.DQGG0201)the National Natural Science Foundation of China(Nos.21976190 and 41575121)
文摘Biogenic volatile organic compounds(BVOCs) in the atmosphere play important roles in the formation of ground-level ozone and secondary organic aerosol(SOA) in global scale and also in regional scale under some condition due to their large amount and relatively higher reactivity.In places with high plant cover in the tropics and in China where air pollution is serious,the effect of BVOCs on ozone and secondary organic aerosols is strong.The present research aims to provide a comprehensive review about the emission rate,emission inventory, research methods,the influencing factors of BVOCs emissions,as well as their impacts on atmospheric environment quality and human health in recent years in Asia based on the summary and analysis of literatures.It is suggested to use field direct measurement method to obtain the emission rate and model method to calculate the emission amount.Several recommendations are given for future investigation and policy development on BVOCs emission.
基金supported by the grants from Beijing Municipal Science and Technology Project(Nos.Z181100005318003 and Z181100005418015)the National Research Program for Key Issues in Air Pollution Control(No.DQGG0201)the National Natural Science Foundation of China(Nos.21976190 and 41575121)
文摘Biogenic volatile organic compounds(BVOC s) have significant effects on atmospheric chemistry,ozone formation and secondary organic aerosol formation.Considering few investigations about BOVCs emissions in north China where is facing serious air pollution in recent years,emissions of various BVOCs from 24 dominant forest species in Beijing were measured from June to September in 2018,using a dynamic headspace sampling method.More than one hundred BVOCs in the collected samples were identified by using an automatic thermal desorption-gas chromatography/mass spectrometry,and their emission rates based on leaf biomass were calculated.Isoprene and monoterpenes were verified to be the dominant BVOCs emitted from the tree species,accounting for more than 50% of the total BVOCs.Generally,broad-leaved species displayed high isoprene emission rates,especially the Platanus occidentalis(21.36μg/(g·hr)),Robinia pseudoacacia(11.55μg/(g·hr)),and Lonicera maackii(9.17μg/(g·hr)),while coniferous species emitted high rates of monoterpenes,such as Platycladus orientalis(27.18μg/(g·hr)),Pinus griffithii(23.11μg/(g·hr)),and Pinus armandii(7.42μg/(g·hr)).High emission rates of monoterpenes from the broad-leaved species of Buxus megistophylla(13.07μg/(g·hr)) and Ligustrum uicaryi(5.74μg/(g·hr)),and high isoprene emission rate from the coniferous tree of Taxus cuspidata(5.86μg/(g·hr)) were also observed.The emission rates of sesquiterpenes from each tree were usually 10-100 times smaller than those of isoprene and monoterpenes.Additionally,relatively high emission rates of oxygenated volatile organic compounds and other alkenes than isoprene and monoterpenes were also found for several tree species.
基金supported by the grants from National Natural Science Foundation of China(No.42077454)National Research Program for Key Issues in Air Pollution Control(DQGG202126)National Natural Science Foundation of China(No.41605077).
文摘Background:Biogenic volatile organic compounds(BVOCs)play an essential role in tropospheric atmospheric chemical reactions.There are few studies conducted on BVOCs emission of dominant forest species in the Jing-Jin-Ji area of China.Based on the field survey,forest resources data and the measured standard emission factors,the Guenther model developed in 1993(G93)was applied in this paper to estimate the emission of BVOCs from several dominant forest species(Platycladus orientalis,Quercus variabilis,Betula platyphylla,Populus tomentosa,Pinus tabuliformis,Robinia pseudoacacia,Ulmus pumila,Salix babylonica and Larix gmelinii)in the Jing-Jin-Ji area in 2017.Then the spatiotemporal emission characteristics and atmospheric chemical reactivity of these species were extensively evaluated.Results:The results showed that the total annual BVOCs emission was estimated to be 70.8 Gg C·year^(−1),consisting 40.5%(28.7 Gg C·year^(−1))of isoprene,36.0%(25.5 Gg C·year^(−1))of monoterpenes and 23.4%(16.6 Gg C·year^(−1))of other VOCs.The emissions from Platycladus orientalis,Quercus variabilis,Populus tomentosa and Pinus tabulaeformis contributed 56.1%,41.2%,36.0% and 31.1%,respectively.The total BVOCs emission from the Jing-Jin-Ji area accounted for 61.9% and 1.8%in summer and winter,respectively.Up to 28.8% of emission was detected from Chengde followed by Beijing with 24.9%,that mainly distributed in the Taihang Mountains and the Yanshan Mountains.Additionally,the Robinia pseudoacacia,Populus tomentosa,Quercus variabilis,and Pinus tabulaeformis contributed mainly to BVOCs reaction activity.Conclusions:The BVOCs emission peaked in summer(June,July,and August)and bottomed out in winter(December,January,and February).Chengde contributed the most,followed by Beijing.Platycladus orientalis,Quercus variabilis,Populus tomentosa,Pinus tabulaeformis and Robinia pseudoacacia represent the primary contributors to BVOCs emission and atmospheric reactivity,hence the planting of these species should be reduced.
