Modeling of a severe dust event and its impacts on ozone photochemistry over the downstream Nanjing megacity of eastern China
Modeling of a severe dust event and its impacts on ozone photochemistry over the downstream Nanjing megacity of eastern China
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中国东部下游南京特大城市严重沙尘事件及其对臭氧光化学影响的模拟
DOI：
10.1016/j.atmosenv.2017.04.010
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发表时间：
2017-07
影响因子：
5
通讯作者：
Chen Pulong
中科院分区：
文献类型：
--
作者：
Li Mengmeng;Wang Tijian;Han Yong;Xie Min;Li Shu;Zhuang Bingliang;Chen Pulong
沙尘气溶胶可以通过与太阳辐射相互作用或为异质反应提供反应表面来影响对流层光化学。本文研究了2014年3月16-18日典型春季沙尘暴对中国东部大城市南京下游臭氧光化学的影响。在线耦合天气研究和预报化学（WRF-Chem）模式，包括8个非均相反应的灰尘表面。与卫星资料和能见度记录的比较表明，模式能够再现这次沙尘暴的开始时间和下游输送。尘埃颗粒作为所有这些微量气体的水槽在这里检查。大气中O3、NO2、NO3、N2 O 5、HNO 3、radical dotOH、HO 2 radical dot和H2 O2的净减少量估计为− 6.1%、− 16.0%、− 37.4%、− 13.9%、− 47.7%、− 6.0%、−9.2%和− 29.7%，其中80%以上可以由尘埃表面的非均相化学解释。地面光解速率和自由基dotOH浓度的降低，沿着沙尘气溶胶引起的其他天气变量的变化（即，辐射和温度）导致较低的光化学活性和O3混合比的约0.5%的小幅下降。这项研究突出了沙尘与臭氧光化学相互作用的重要性，也为进一步研究沙尘对对流层气溶胶化学的复杂影响奠定了基础。
Dust aerosols could affect tropospheric photochemistry by interacting with solar radiation or providing reactive surfaces for heterogeneous reactions. This study examines the effects of a typical springtime dust storm (16–18 March, 2014) on ozone photochemistry over the downstream Nanjing megacity in eastern China. The on-line coupled Weather Research and Forecasting-Chemistry (WRF-Chem) model is used, with the inclusion of eight heterogeneous reactions on dust surfaces. Comparisons with satellite data and visibility record indicate that the model is capable of reproducing the onset time and downstream transport of this dust event. Dust particles act as a sink for all these trace gases examined here. The net decreases of O3, NO2, NO3, N2O5, HNO3, radical dotOH, HO2radical dot and H2O2in the atmosphere are estimated as −6.1%, −16.0%, −37.4%, −13.9%, −47.7%, −6.0%, −9.2% and −29.7%, of which more than 80% can be explained by heterogeneous chemistry on dust surfaces. The decreases in ground photolysis rate and radical dotOH concentration, along with changes in other weather variables induced by dust aerosols (i.e., radiation and temperature) lead to lower photochemical activity and a small decrease of O3mixing ratio by roughly 0.5%. This study highlights the importance of dust interaction with ozone photochemistry, and also sets the stage for further investigation of the complicated dust impacts on tropospheric aerosol chemistry.
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影响因子：
--
作者：
I. Kavouras;V. Etyemezian;D. DuBois;Jin Xu;M. Pitchford
通讯作者：
I. Kavouras;V. Etyemezian;D. DuBois;Jin Xu;M. Pitchford
影响因子：
5.2
作者：
A. E. Michel;C. Usher;Vicki H. Grassian
通讯作者：
A. E. Michel;C. Usher;Vicki H. Grassian
DOI：
--
发表时间：
--
期刊：
--
影响因子：
--
作者：
R. Park;S. Lee;S.-K Shin;C. H. Song
通讯作者：
R. Park;S. Lee;S.-K Shin;C. H. Song
影响因子：
5.2
作者：
K. Sassen
通讯作者：
K. Sassen
影响因子：
5
作者：
X. Kong;R. Forkel;R. Sokhi;P. Suppan;A. Baklanov;M. Gauß;D. Brunner;R. Baró;A. Balzarini;C. Chemel;G. Curci;P. Jiménez‐Guerrero;M. Hirtl;L. Honzak;U. Im;J. Perez;G. Pirovano;R. San José;K. Schlünzen;G. Tsegas;P. Tuccella;J. Werhahn;R. Žabkar;S. Galmarini
通讯作者：
X. Kong;R. Forkel;R. Sokhi;P. Suppan;A. Baklanov;M. Gauß;D. Brunner;R. Baró;A. Balzarini;C. Chemel;G. Curci;P. Jiménez‐Guerrero;M. Hirtl;L. Honzak;U. Im;J. Perez;G. Pirovano;R. San José;K. Schlünzen;G. Tsegas;P. Tuccella;J. Werhahn;R. Žabkar;S. Galmarini