Articles | Volume 21, issue 5
https://doi.org/10.5194/acp-21-3531-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-21-3531-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
09 Mar 2021
Research article |
| 09 Mar 2021
| 09 Mar 2021
The impact of inhomogeneous emissions and topography on ozone photochemistry in the vicinity of Hong Kong Island
Department of Civil and Environmental Engineering, the Hong Kong
Polytechnic University, Hung Hom, Kowloon, Hong Kong
Yong-Feng Ma
Department of Mechanics & Aerospace Engineering, Southern
University of Science and Technology, Shenzhen, 518055, China
Domingo Muñoz-Esparza
Research Applications Laboratory, National Center for Atmospheric Research, Boulder, CO, USA
Cathy W. Y. Li
Max Planck Institute for Meteorology, 20146 Hamburg, Germany
Mary Barth
Atmospheric Chemistry Observation & Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO, USA
Department of Civil and Environmental Engineering, the Hong Kong
Polytechnic University, Hung Hom, Kowloon, Hong Kong
Guy P. Brasseur
Department of Civil and Environmental Engineering, the Hong Kong
Polytechnic University, Hung Hom, Kowloon, Hong Kong
Max Planck Institute for Meteorology, 20146 Hamburg, Germany
Atmospheric Chemistry Observation & Modeling Laboratory, National Center for Atmospheric Research, Boulder, CO, USA
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Revised manuscript not accepted
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This work investigates the long-term changes in new particle formation (NPF) events under reduced SO2 emissions at the summit of Mt. Tai during seven campaigns from 2007 to 2018. We found the NPF intensity increased 2- to 3-fold in 2018 compared to 2007. In contrast, the probability of new particles growing to CCN size largely decreased. Changes to biogenic VOCs and anthropogenic emissions are proposed to explain the distinct NPF characteristics.
Cathy W. Y. Li, Guy P. Brasseur, Hauke Schmidt, and Juan Pedro Mellado
Atmos. Chem. Phys., 21, 483–503, https://doi.org/10.5194/acp-21-483-2021, https://doi.org/10.5194/acp-21-483-2021, 2021
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Intense and localised emissions of pollutants are common in urban environments, in which turbulence cannot mix these segregated pollutants efficiently in the atmosphere. Despite their relatively high resolution, regional models cannot resolve such segregation and assume instantaneous mixing of these pollutants in their model grids, which potentially induces significant error in the subsequent chemical calculation, based on our calculation with a model that explicitly resolves turbulent motions.
Zhenhao Ling, Qianqian Xie, Min Shao, Zhe Wang, Tao Wang, Hai Guo, and Xuemei Wang
Atmos. Chem. Phys., 20, 11451–11467, https://doi.org/10.5194/acp-20-11451-2020, https://doi.org/10.5194/acp-20-11451-2020, 2020
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The observation data from a receptor site in the Pearl River Delta region were analyzed by a photochemical box model with near-explicit chemical mechanisms (i.e., the Master Chemical Mechanism, MCM), improvements with reversible and irreversible heterogeneous processes of glyoxal and methylglyoxal, and the gas-particle partitioning of oxidation products in the present study.
Cited articles
Anfossi, D., Rizza, U., Mangia, C., Degrazia, G. A., and Pereira Marques
Filho, E.: Estimation of the ratio between the Lagrangian and Eulerian time
scales in an atmospheric boundary layer generated by large eddy simulation,
Atmos. Environ., 40, 326–337, https://doi.org/10.1016/j.atmosenv.2005.09.041, 2006.
Auger, L. and Legras, B.: Chemical segregation by heterogeneous emissions,
Atmos. Environ., 41, 2303–2318, https://doi.org/10.1016/j.atmosenv.2006.11.032,
2007.
Barth, M. C., Kim, S.-W., Wang, C., Pickering, K. E., Ott, L. E., Stenchikov, G., Leriche, M., Cautenet, S., Pinty, J.-P., Barthe, Ch., Mari, C., Helsdon, J. H., Farley, R. D., Fridlind, A. M., Ackerman, A. S., Spiridonov, V., and Telenta, B.: Cloud-scale model intercomparison of chemical constituent transport in deep convection, Atmos. Chem. Phys., 7, 4709–4731, https://doi.org/10.5194/acp-7-4709-2007, 2007.
Brasseur, G. P. and Jacob, D. J.: Modeling of Atmospheric Chemistry,
Cambridge University Press, Cambridge, 2017.
Cao, S., Wang, T., Ge, Y., and Tamura, Y.: Numerical study on turbulent
boundary layers over two-dimensional hills–Effects of surface roughness
and slope, J. Wind Eng. Ind. Aerodyn., 104, 342–349,
https://doi.org/10.1016/j.jweia.2012.02.022, 2012.
Damköhler G.: Influence of turbulence on the velocity of flames in gas
mixtures, Z. Elektrochem., 46, 601–626, 1940.
Danckwerts, P. V.: The definition and measurement of some characteristics of
mixtures, Appl. Sci. Res., 3, 279–296, https://doi.org/10.1007/BF03184936,
1952.
Deardorff, J. W.: A numerical study of three-dimensional turbulent channel
flow at large Reynolds numbers, J. Fluid Mech., 41, 453–480,
https://doi.org/10.1017/S0022112070000691, 1970.
De Wekker, S. F. and Kossmann, M.: Convective boundary layer heights over
mountainous terrain – A review of concepts, Front. Earth Sci., 3, 77,
https://doi.org/10.3389/feart.2015.00077, 2015.
Dlugi, R., Berger, M., Zelger, M., Hofzumahaus, A., Rohrer, F., Holland, F., Lu, K., and Kramm, G.: The balances of mixing ratios and segregation intensity: a case study from the field (ECHO 2003), Atmos. Chem. Phys., 14, 10333–10362, https://doi.org/10.5194/acp-14-10333-2014, 2014.
Dlugi, R., Berger, M., Mallik, C., Tsokankunku, A., Zelger, M., Acevedo, O. C., Bourtsoukidis, E., Hofzumahaus, A., Kesselmeier, J., Kramm, G., Marno, D., Martinez, M., Nölscher, A. C., Ouwersloot, H., Pfannerstill, E. Y., Rohrer, F., Tauer, S., Williams, J., Yáñez-Serrano, A.-M., Andreae, M. O., Harder, H., and Sörgel, M.: Segregation in the Atmospheric Boundary Layer: The Case of OH – Isoprene, Atmos. Chem. Phys. Discuss. [preprint], https://doi.org/10.5194/acp-2018-1325, 2019.
ESA: Land Cover CCI Product User Guide Version 2, Tech. Rep.,
available at:
http://maps.elie.ucl.ac.be/CCI/viewer/download/ESACCI-LC-Ph2-PUGv2_2.0.pdf (last access: 1 June 2020), 2017.
Ganzeveld, L. and Lelieveld, J.: Dry deposition parameterization in a
chemistry general circulation model and its influence on the distribution of
reactive trace gases, J. Geophys. Res., 100, 20999–21012,
https://doi.org/10.1029/95JD02266, 1995.
Kaser, L., Karl, T., Yuan, B., Mauldin, R. L., Cantrell, C. A., Guenther, A.
B., Patton, E. G., Weinheimer, A. J., Knote, C., Orlando, J., Emmons, L.,
Apel, E., Hornbrook, R., Shertz, S., Ullmann, K., Hall, S., Graus, M., de
Gouw, J., Zhou, X., and Ye, C.: Chemistry-turbulence interactions and
mesoscale variability influence the cleansing efficiency of the atmosphere,
Geophys. Res. Lett., 42, 10894–10903, https://doi.org/10.1002/2015GL066641, 2015.
Kessler, E.: On the distribution and continuity of water substance in
atmospheric circulations, Am. Meteorol. Soc., Boston, MA,
https://doi.org/10.1007/978-1-935704-36-2_1, 1969.
Kim, S. W., Barth, M. C., and Trainer, M.: Impact of turbulent mixing on
isoprene chemistry, Geophys. Res. Lett., 43, 7701–7708,
https://doi.org/10.1002/2016GL069752, 2016.
Kirkil, G., Mirocha, J., Bou-Zeid, E., Chow, F., K., and
Kosovi'c, B.: Implementation and evaluation of dynamic
subfilter-scale stress models for large-eddy simulation using WRF, Mon.
Weather Rev., 140, 266–284, https://doi.org/10.1175/MWR-D-11-00037.1, 2012.
Komori, S., Hunt, J. C. R., Kanzaki, T., and Murakami, Y.: The effects of
turbulent mixing on the correlation between two species and on concentration
fluctuations in non-premixed reacting flows, J. Fluid Mech. Digit. Arch.,
228, 629–659, https://doi.org/10.1017/S0022112091002847, 1991.
Kosović, B., Mirocha, J. D., and Lundquist, K. A.: Validation of
large-eddy simulation of flows over complex terrain with the weather
research and forecasting model, 21st Symposium on Boundary Layers and
Turbulence, 8–13 June 2014, Leeds, UK, 3A.3, 2014.
Kramm, G. and Meixner, F. X.: On the dispersion of trace species in the
atmospheric boundary layer: a re-formulation of the governing equations for
the turbulent flow of the compressible atmosphere, Tellus A, 52, 500–522, https://doi.org/10.3402/tellusa.v52i5.12279, 2000.
Krol, M. C., Molemaker, M. J., and Vilà-Guerau De Arellano, J.: Effects
of turbulence and heterogeneous emission on photochemically active species
in the convective boundary layer, J. Geophys. Res., 105, 6871–6884,
https://doi.org/10.1029/1999JD900958, 2000.
Li, C. W. Y., Brasseur, G. P., Schmidt, H., and Mellado, J. P.: Error induced by neglecting subgrid chemical segregation due to inefficient turbulent mixing in regional chemical-transport models in urban environments, Atmos. Chem. Phys., 21, 483–503, https://doi.org/10.5194/acp-21-483-2021, 2021.
Li, Y., Barth, M. C., Chen, G., Patton, E. G., Kim, S. W., Wisthaler, A.,
Mikoviny, T., Fried, A., Clark, R., and Steiner, A. L.: Large-eddy
simulation of biogenic VOC chemistry during the DISCOVER-AQ 2011 campaign,
J. Geophys. Res., 121, 8083–8105, https://doi.org/10.1002/2016JD024942, 2016.
Li, Y., Barth, M. C., Patton, E. G., and Steiner, A. L.: Impact of in-cloud
aqueous processes on the chemistry and transport of biogenic volatile
organic compounds, J. Geophys. Res., 122, 11131–11153,
https://doi.org/10.1002/2017JD026688, 2017.
Li, Y., Barth, M. C., and Steiner, A. L.: Comparing turbulent mixing of
atmospheric oxidants across model scales, Atmos. Environ., 199, 88–101,
https://doi.org/10.1016/j.atmosenv.2018.11.004, 2019.
Liang, J., Guo, Q., Zhang, Z., Zhang, M., Tian, P., and Zhang, L.: Influence
of complex terrain on near-surface turbulence structures over Loess Plateau,
Atmosphere-Basel, 11, 930, https://doi.org/10.3390/atmos11090930, 2020.
Liu, S. and Liang, X. Z.: Observed diurnal cycle climatology of planetary
boundary layer height, J. Climate, 23, 5790–5809,
https://doi.org/10.1175/2010JCLI3552.1, 2010.
Mapes, B. E., Warner, T. T., Xu, M., and Gochis, D. J.: Comparison of cumulus
parameterizations and entrainment using domain-mean wind divergence in a
regional model, J. Atmos. Sci., 61, 1284–1295,
https://doi.org/10.1175/1520-0469(2004)061<1284:COCPAE>2.0.CO;2,
2004.
Moeng, C.-H., Dudhia, J., Klemp, J., and Sullivan, P.: Examining two-way
grid nesting for large eddy simulation of the PBL using the WRF model, Mon.
Weather Rev., 135, 2295–2311, https://doi.org/10.1175/mwr3406.1, 2007.
Molemaker, M. J. and Vilà-Guerau de Arellano, J.: Control of chemical
reactions by convective turbulence in the boundary layer, J. Atmos. Sci.,
55, 568–579, https://doi.org/10.1175/1520-0469(1998)055<0568:COCRBC>2.0.CO;2, 1998.
Muñoz-Esparza, D., Kosović, B., García-Sánchez, C., and van
Beeck, J.: Nesting turbulence in an offshore convective boundary layer using
large-eddy simulations, Bound.-Lay. Meteorol., 151, 453–478,
https://doi.org/10.1007/s10546-014-9911-9, 2014.
Ouwersloot, H. G., Vilà-Guerau de Arellano, J., van Heerwaarden, C. C., Ganzeveld, L. N., Krol, M. C., and Lelieveld, J.: On the segregation of chemical species in a clear boundary layer over heterogeneous land surfaces, Atmos. Chem. Phys., 11, 10681–10704, https://doi.org/10.5194/acp-11-10681-2011, 2011.
Patton, E. G., Davis, K. J., Barth, M. C., and Sullivan, P. P.: Decaying
scalars emitted by a forest canopy: a numerical study, Bound.-Lay.
Meteorol., 100, 91–129, https://doi.org/10.1023/A:1019223515444, 2001.
Rotach, M. W., Gohm, A., Lang, M. N., Leukauf, D., Stiperski, I., and
Wagner, J. S.: On the vertical exchange of heat, mass, and momentum over
complex, mountainous terrain, Front. Earth Sci., 3, 76,
https://doi.org/10.3389/feart.2015.00076, 2015.
Schumann, U.: Large-eddy simulation of turbulent diffusion with chemical
reactions in the convective boundary layer, Atmos. Environ., 23,
1713–1727, https://doi.org/10.1016/0004-6981(89)90056-5, 1989.
Seidel, D. J., Ao, C. O., and Li, K.: Estimating climatological planetary
boundary layer heights from radiosonde observations: Comparison of methods
and uncertainty analysis, J. Geophys. Res., 115, D16113,
https://doi.org/10.1029/2009JD013680, 2010.
Shu, Z. R., Li, Q. S., and Chan, P. W.: Statistical analysis of wind
characteristics and wind energy potential in Hong Kong, Energy Convers.
Manag., 101, 644–657, https://doi.org/10.1016/j.enconman.2015.05.070, 2015.
Skamarock, W. C. and Klemp, J. B.: A time-split nonhydrostatic atmospheric
model for weather research and forecasting applications, J. Comput. Phys.,
227, 3465–3485, https://doi.org/10.1016/j.jcp.2007.01.037, 2008.
Skamarock, W. C., Klemp, J. B., Dudhia, J., Gill, D. O., Liu, Z., Berner,
J., Wang, W., Powers, J. G., Duda, M. G., Barker, D. M., and Huang, X.-Y.: A
Description of the Advanced Research WRF Version 4, NCAR Tech. Note
NCAR/TN-556+STR, 145 pp., https://doi.org/10.5065/1dfh-6p97, 2019.
Smagorinsky, J.: General circulation experiments with the primitive
equations: I. the basic experiment, Mon. Weather Rev., 91, 99–164,
https://doi.org/10.1175/1520-0493(1963)091<0099:GCEWTP>2.3.CO;2,
1963.
Takaku, J., Tadono, T., and Tsutsui, K.: Generation of High Resolution Global DSM from ALOS PRISM, Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XL-4, 243–248, https://doi.org/10.5194/isprsarchives-XL-4-243-2014, 2014.
Verver, G. H. L., van Dop, H., and Holtslag, A. A. M.: Turbulent mixing and
the chemical breakdown of isoprene in the atmospheric boundary layer, J.
Geophys. Res., 105, 3983–4002, https://doi.org/10.1029/1999JD900956, 2000.
Vilà-Guerau de Arellano, J. and Duynkerke, P. G.: Second-order closure
study of the covariance between chemically reactive species in the surface
layer, J. Atmos. Chem., 16, 145–155, https://doi.org/10.1007/BF00702784, 1993.
Vinuesa, J. F. and Vilà-Guerau de Arellano, J.: Introducing effective
reaction rates to account for the inefficient mixing of the convective
boundary layer, Atmos. Environ., 39, 445–461,
https://doi.org/10.1016/j.atmosenv.2004.10.003, 2005.
Vinuesa, J. F. and Vilà-Guerau de Arellano, J.: Fluxes and
(co-)variances of reacting scalars in the convective boundary layer, Tellus
B, 55, 935–949, https://doi.org/10.3402/tellusb.v55i4.16382, 2011.
Wu, Z., Wang, X., Chen, F., Turnipseed, A. A., Guenther, A. B., Niyogi, D.,
Charusombat, U., Xia, B., Munger, J. W., and Alapaty, K.: Evaluating the
calculated dry deposition velocities of reactive nitrogen oxides and ozone
from two community models over a temperate deciduous forest, Atmos.
Environ., 45, 2663–2674, https://doi.org/10.1016/j.atmosenv.2011.02.063, 2011.
Yamaguchi, T. and Feingold, G.: Technical note: Large-eddy simulation of
cloudy boundary layer with the Advanced Research WRF model, J. Adv. Model.
Earth Syst., 4, M09003, https://doi.org/10.1029/2012MS000164, 2012.
Short summary
Large-eddy simulations (LESs) were performed in the mountainous region of the island of Hong Kong to investigate the degree to which the rates of chemical reactions between two reactive species are reduced due to the segregation of species within the convective boundary layer. We show that the inhomogeneity in emissions plays an important role in the segregation effect. Topography also has a significant influence on the segregation locally.
Large-eddy simulations (LESs) were performed in the mountainous region of the island of Hong...
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