149 citations as recorded by crossref.

1. Gas-phase reactive nitrogen near Grand Teton National Park: Impacts of transport, anthropogenic emissions, and biomass burning A. Prenni et al. 10.1016/j.atmosenv.2014.03.017
2. Modelling land–atmosphere daily exchanges of NO, NH<sub>3</sub>, and CO<sub>2</sub> in a semi-arid grazed ecosystem in Senegal C. Delon et al. 10.5194/bg-16-2049-2019
3. Processes of ammonia air–surface exchange in a fertilized <i>Zea mays</i> canopy J. Walker et al. 10.5194/bg-10-981-2013
4. Surface Wetness as an Unexpected Control on Forest Exchange of Volatile Organic Acids S. Fulgham et al. 10.1029/2020GL088745
5. Atmospheric nitrogen deposition: A review of quantification methods and its spatial pattern derived from the global monitoring networks Q. Zhang et al. 10.1016/j.ecoenv.2021.112180
6. Global sensitivities of reactive N and S gas and particle concentrations and deposition to precursor emissions reductions Y. Ge et al. 10.5194/acp-23-6083-2023
7. High NH3 deposition in the environs of a commercial fattening pig farm in central south China W. Yi et al. 10.1088/1748-9326/ac3603
8. Spatial Distribution of Ammonia Concentrations and Modeled Dry Deposition in an Intensive Dairy Production Region A. Leytem et al. 10.3390/atmos15010015
9. Atmospheric nitrogen deposition to China: A model analysis on nitrogen budget and critical load exceedance Y. Zhao et al. 10.1016/j.atmosenv.2017.01.018
10. Toward the improvement of total nitrogen deposition budgets in the United States J. Walker et al. 10.1016/j.scitotenv.2019.07.058
11. Intense Warming Will Significantly Increase Cropland Ammonia Volatilization Threatening Food Security and Ecosystem Health H. Shen et al. 10.1016/j.oneear.2020.06.015
12. Ammonia Dry Deposition in an Alpine Ecosystem Traced to Agricultural Emission Hotpots D. Pan et al. 10.1021/acs.est.0c05749
13. Ammonia volatilisation following urea fertilisation in an irrigated sorghum crop in Italy R. Ferrara et al. 10.1016/j.agrformet.2014.05.010
14. Contributions of natural and anthropogenic sources to ambient ammonia in the Athabasca Oil Sands and north-western Canada C. Whaley et al. 10.5194/acp-18-2011-2018
15. Assessing PM2.5 model performance for the conterminous U.S. with comparison to model performance statistics from 2007-2015 J. Kelly et al. 10.1016/j.atmosenv.2019.116872
16. An analysis of CMAQ gas-phase dry deposition over North America through grid-scale and land-use-specific diagnostics in the context of AQMEII4 C. Hogrefe et al. 10.5194/acp-23-8119-2023
17. Projections of Atmospheric Nitrogen Deposition to the Chesapeake Bay Watershed P. Campbell et al. 10.1029/2019JG005203
18. Effects of elevated ozone concentration and nitrogen addition on ammonia stomatal compensation point in a poplar clone W. Xu et al. 10.1016/j.envpol.2018.03.089
19. Coupling atmospheric ammonia exchange process over a rice paddy field with a multi-layer atmosphere–soil–vegetation model G. Katata et al. 10.1016/j.agrformet.2013.05.001
20. Dry deposition of nitrogen compounds (NO<sub>2</sub>, HNO<sub>3</sub>, NH<sub>3</sub>), sulfur dioxide and ozone in west and central African ecosystems using the inferential method M. Adon et al. 10.5194/acp-13-11351-2013
21. A process-based model for ammonia emission from urine patches, GAG (Generation of Ammonia from Grazing): description and sensitivity analysis A. Móring et al. 10.5194/bg-13-1837-2016
22. Effects of atmospheric CO2 on canopy uptake of gaseous ammonia by tomato (Lycopersicum esculentum Mill.) in polytunnel vegetable production systems H. Huang et al. 10.1016/j.scienta.2021.110739
23. Improved modelling of atmospheric ammonia over Denmark using the coupled modelling system DAMOS C. Geels et al. 10.5194/bg-9-2625-2012
24. Effects of global change during the 21st century on the nitrogen cycle D. Fowler et al. 10.5194/acp-15-13849-2015
25. Spatial variation of modelled total, dry and wet nitrogen deposition to forests at global scale D. Schwede et al. 10.1016/j.envpol.2018.09.084
26. Vertical profile and flux measurements of ammonia in a deciduous forest in Japan towards improvement of bi-directional exchange model M. Xu et al. 10.1016/j.atmosenv.2023.120144
27. Modeling of ammonia dry deposition to a pocosin landscape downwind of a large poultry facility J. Walker et al. 10.1016/j.agee.2013.10.029
28. Spatial heterogeneity of ammonia fluxes in a deciduous forest and adjacent grassland X. Guo et al. 10.1016/j.agrformet.2022.109128
29. Impacts of climate and emission changes on nitrogen deposition in Europe: a multi-model study D. Simpson et al. 10.5194/acp-14-6995-2014
30. A hybrid modeling approach for estimating reactive nitrogen deposition in Rocky Mountain National Park W. Malm et al. 10.1016/j.atmosenv.2015.11.060
31. Ammonia measurements from space with the Cross-track Infrared Sounder: characteristics and applications M. Shephard et al. 10.5194/acp-20-2277-2020
32. Projected change in atmospheric nitrogen deposition to the Baltic Sea towards 2020 C. Geels et al. 10.5194/acp-12-2615-2012
33. A review of measurements of air-surface exchange of reactive nitrogen in natural ecosystems across North America J. Walker et al. 10.1016/j.scitotenv.2019.133975
34. Unraveling the diurnal atmospheric ammonia budget of a prototypical convective boundary layer R. Schulte et al. 10.1016/j.atmosenv.2020.118153
35. Remote sensing and in situ measurements of methane and ammonia emissions from a megacity dairy complex: Chino, CA I. Leifer et al. 10.1016/j.envpol.2016.09.083
36. Aspects of uncertainty in total reactive nitrogen deposition estimates for North American critical load applications J. Walker et al. 10.1016/j.scitotenv.2019.06.337
37. Towards a coupled paradigm of NH3‐CO2 biosphere–atmosphere exchange modelling F. Schrader et al. 10.1111/gcb.15184
38. Multiple gap-filling for eddy covariance datasets A. Lucas-Moffat et al. 10.1016/j.agrformet.2022.109114
39. Estimation of ammonia deposition to forest ecosystems in Scotland and Sri Lanka using wind-controlled NH3 enhancement experiments A. Deshpande et al. 10.1016/j.atmosenv.2023.120325
40. Atmospheric deposition of reactive nitrogen to a deciduous forest in the southern Appalachian Mountains J. Walker et al. 10.5194/bg-20-971-2023
41. Estimating NH<sub>3</sub> emissions from agricultural fertilizer application in China using the bi-directional CMAQ model coupled to an agro-ecosystem model X. Fu et al. 10.5194/acp-15-6637-2015
42. Contrasting change trends in dry and wet nitrogen depositions during 2011 to 2020: Evidence from an agricultural catchment in subtropical Central China W. Jiang et al. 10.1016/j.scitotenv.2023.168094
43. Estimating source-sink distributions and fluxes of reactive nitrogen and sulfur within a mixed forest canopy Z. Wu et al. 10.1016/j.agrformet.2023.109386
44. Accounting for Field-Scale Dry Deposition in Backward Lagrangian Stochastic Dispersion Modelling of NH3 Emissions C. Häni et al. 10.3390/atmos9040146
45. Ammonia emissions from deciduous forest after leaf fall K. Hansen et al. 10.5194/bg-10-4577-2013
46. An assessment of the performance of the Monitor for AeRosols and GAses in ambient air (MARGA): a semi-continuous method for soluble compounds I. Rumsey et al. 10.5194/acp-14-5639-2014
47. Interannual variability of ammonia concentrations over the United States: sources and implications L. Schiferl et al. 10.5194/acp-16-12305-2016
48. Nitrogen emission and deposition budget in an agricultural catchment in subtropical central China X. Zhu et al. 10.1016/j.envpol.2021.117870
49. Land Use Specific Ammonia Deposition Velocities: a Review of Recent Studies (2004–2013) F. Schrader & C. Brümmer 10.1007/s11270-014-2114-7
50. Diurnal evolution of total column and surface atmospheric ammonia in the megacity of Paris, France, during an intense springtime pollution episode R. Kutzner et al. 10.5194/acp-21-12091-2021
51. Ideas and perspectives: on the emission of amines from terrestrial vegetation in the context of new atmospheric particle formation J. Sintermann & A. Neftel 10.5194/bg-12-3225-2015
52. Half‐Century Ammonia Emissions From Agricultural Systems in Southern Asia: Magnitude, Spatiotemporal Patterns, and Implications for Human Health R. Xu et al. 10.1002/2017GH000098
53. Evaluation of a new inference method for estimating ammonia volatilisation from multiple agronomic plots B. Loubet et al. 10.5194/bg-15-3439-2018
54. Measurement report: Short-term variation in ammonia concentrations in an urban area increased by mist evaporation and emissions from a forest canopy with bird droppings K. Osada 10.5194/acp-20-11941-2020
55. Review of methods for assessing deposition of reactive nitrogen pollutants across complex terrain with focus on the UK N. Cowan et al. 10.1039/D2EA00012A
56. Sources and Impacts of Atmospheric NH3: Current Understanding and Frontiers for Modeling, Measurements, and Remote Sensing in North America L. Zhu et al. 10.1007/s40726-015-0010-4
57. Fertilizer Nitrogen and Corn Plants: Not all Volatilized Ammonia is Lost E. Schoninger et al. 10.2134/agronj2017.07.0372
58. An empirical inferential method of estimating nitrogen deposition to Mediterranean-type ecosystems: the San Bernardino Mountains case study A. Bytnerowicz et al. 10.1016/j.envpol.2015.03.028
59. Rocky Mountain National Park reduced nitrogen source apportionment T. Thompson et al. 10.1002/2014JD022675
60. The role of dew as a night-time reservoir and morning source for atmospheric ammonia G. Wentworth et al. 10.5194/acp-16-7435-2016
61. Canopy uptake of volatilized 15NH3 derived from urea applications by tomato (Lycopersicum esculentum Mill.) in plastic-shed vegetable production systems H. Li et al. 10.1016/j.scienta.2021.110132
62. Modelling agro-forestry scenarios for ammonia abatement in the landscape W. Bealey et al. 10.1088/1748-9326/9/12/125001
63. Increasing importance of deposition of reduced nitrogen in the United States Y. Li et al. 10.1073/pnas.1525736113
64. The interaction between nitrogen and phosphorous is a strong predictor of intra-plant variation in nitrogen isotope composition in a desert species J. Zhang et al. 10.5194/bg-14-131-2017
65. Ammonia emissions from a dairy housing and wastewater treatment plant quantified with an inverse dispersion method accounting for deposition loss A. Valach et al. 10.1080/10962247.2023.2271426
66. Effects of nitrogen addition on enzyme activity and metabolites related to nitrogen transformation in Suaeda salsa Y. Liu et al. 10.1007/s11738-023-03601-z
67. Governing processes for reactive nitrogen compounds in the European atmosphere O. Hertel et al. 10.5194/bg-9-4921-2012
68. Towards a climate-dependent paradigm of ammonia emission and deposition M. Sutton et al. 10.1098/rstb.2013.0166
69. The hidden cost of using low-resolution concentration data in the estimation of NH3 dry deposition fluxes F. Schrader et al. 10.1038/s41598-017-18021-6
70. Greater Contribution From Agricultural Sources to Future Reactive Nitrogen Deposition in the United States Y. Chen et al. 10.1029/2019EF001453
71. Sensitivity of continental United States atmospheric budgets of oxidized and reduced nitrogen to dry deposition parametrizations R. Dennis et al. 10.1098/rstb.2013.0124
72. Estimate of changes in agricultural terrestrial nitrogen pathways and ammonia emissions from 1850 to present in the Community Earth System Model S. Riddick et al. 10.5194/bg-13-3397-2016
73. Temporal variability of ammonia emission potentials for six plant species in an evergreen subtropical forest in southwest China J. Cui et al. 10.1007/s11356-017-8650-0
74. Non-stomatal exchange in ammonia dry deposition models: comparison of two state-of-the-art approaches F. Schrader et al. 10.5194/acp-16-13417-2016
75. Investigating sources of measured forest-atmosphere ammonia fluxes using two-layer bi-directional modelling K. Hansen et al. 10.1016/j.agrformet.2017.02.008
76. Reactive nitrogen fluxes over peatland and forest ecosystems using micrometeorological measurement techniques C. Brümmer et al. 10.5194/essd-14-743-2022
77. Dry Deposition Methods Based on Turbulence Kinetic Energy: 1. Evaluation of Various Resistances and Sensitivity Studies Using a Single‐Point Model K. Alapaty et al. 10.1029/2022JD036631
78. Representing sub-grid scale variations in nitrogen deposition associated with land use in a global Earth system model: implications for present and future nitrogen deposition fluxes over North America F. Paulot et al. 10.5194/acp-18-17963-2018
79. Pan-European rural monitoring network shows dominance of NH<sub>3</sub> gas and NH<sub>4</sub>NO<sub>3</sub> aerosol in inorganic atmospheric pollution load Y. Tang et al. 10.5194/acp-21-875-2021
80. Monthly Patterns of Ammonia Over the Contiguous United States at 2‐km Resolution R. Wang et al. 10.1029/2020GL090579
81. Ammonia fluxes over an agricultural field in growing and fallow periods using relaxed eddy accumulation M. Xu et al. 10.1016/j.atmosenv.2022.119195
82. DRY and BULK atmospheric nitrogen deposition to a West-African humid forest exposed to terrestrial and oceanic sources T. Bertolini et al. 10.1016/j.agrformet.2015.12.026
83. TES ammonia retrieval strategy and global observations of the spatial and seasonal variability of ammonia M. Shephard et al. 10.5194/acp-11-10743-2011
84. Soil–atmosphere exchange of ammonia in a non-fertilized grassland: measured emission potentials and inferred fluxes G. Wentworth et al. 10.5194/bg-11-5675-2014
85. Implementation of the effect of urease inhibitor on ammonia emissions following urea-based fertilizer application at a Zea mays field in central Illinois: A study with SURFATM-NH3 model N. Lichiheb et al. 10.1016/j.agrformet.2019.02.005
86. Assessing the ammonium nitrate formation regime in the Paris megacity and its representation in the CHIMERE model H. Petetin et al. 10.5194/acp-16-10419-2016
87. Global ammonia emissions from synthetic nitrogen fertilizer applications in agricultural systems: Empirical and process‐based estimates and uncertainty R. Xu et al. 10.1111/gcb.14499
88. Global agricultural ammonia emissions simulated with the ORCHIDEE land surface model M. Beaudor et al. 10.5194/gmd-16-1053-2023
89. Technical note: AQMEII4 Activity 1: evaluation of wet and dry deposition schemes as an integral part of regional-scale air quality models S. Galmarini et al. 10.5194/acp-21-15663-2021
90. Surface Flux Modeling for Air Quality Applications J. Pleim & L. Ran 10.3390/atmos2030271
91. Analysis of atmospheric ammonia concentration from four sites in Quebec City region over 2010–2013 A. Larios et al. 10.1016/j.apr.2017.11.001
92. Measurements of nitric oxide and ammonia soil fluxes from a wet savanna ecosystem site in West Africa during the DACCIWA field campaign F. Pacifico et al. 10.5194/acp-19-2299-2019
93. Deposition of sulphur and nitrogen in Europe 1900–2050. Model calculations and comparison to historical observations M. Engardt et al. 10.1080/16000889.2017.1328945
94. Atmospheric pollutants in peri-urban forests of Quercus ilex: evidence of pollution abatement and threats for vegetation H. García-Gómez et al. 10.1007/s11356-015-5862-z
95. Elevated atmospheric CO2 decreases the ammonia compensation point of barley plants L. Wang et al. 10.1093/jxb/ert117
96. The Community Multiscale Air Quality (CMAQ) model versions 5.3 and 5.3.1: system updates and evaluation K. Appel et al. 10.5194/gmd-14-2867-2021
97. Observational relationships between ammonia, carbon dioxide and water vapor under a wide range of meteorological and turbulent conditions: RITA-2021 campaign R. Schulte et al. 10.5194/bg-21-557-2024
98. Air pollution and plant health response-current status and future directions P. Anand et al. 10.1016/j.apr.2022.101508
99. Linking agricultural crop management and air quality models for regional to national-scale nitrogen assessments E. Cooter et al. 10.5194/bg-9-4023-2012
100. New Bidirectional Ammonia Flux Model in an Air Quality Model Coupled With an Agricultural Model J. Pleim et al. 10.1029/2019MS001728
101. Background concentrations and fluxes of atmospheric ammonia over a deciduous forest K. Hansen et al. 10.1016/j.agrformet.2015.09.004
102. Modeling the distribution of ammonia across Europe including bi-directional surface–atmosphere exchange R. Wichink Kruit et al. 10.5194/bg-9-5261-2012
103. Evaluation of a regional air-quality model with bidirectional NH<sub>3</sub> exchange coupled to an agroecosystem model J. Bash et al. 10.5194/bg-10-1635-2013
104. Drivers for spatial, temporal and long-term trends in atmospheric ammonia and ammonium in the UK Y. Tang et al. 10.5194/acp-18-705-2018
105. Understanding emissions of ammonia from buildings and the application of fertilizers: an example from Poland M. Werner et al. 10.5194/bg-12-3623-2015
106. Spatial Heterogeneity of Ammonia Fluxes in a Deciduous Forest and Adjacent Grassland X. Guo et al. 10.2139/ssrn.4067260
107. Process-based modelling of NH<sub>3</sub> exchange with grazed grasslands A. Móring et al. 10.5194/bg-14-4161-2017
108. Soil and vegetation-atmosphere exchange of NO, NH 3 , and N 2 O from field measurements in a semi arid grazed ecosystem in Senegal C. Delon et al. 10.1016/j.atmosenv.2017.02.024
109. Updates to the Noah Land Surface Model in WRF‐CMAQ to Improve Simulated Meteorology, Air Quality, and Deposition P. Campbell et al. 10.1029/2018MS001422
110. Quantification of Atmospheric Ammonia Concentrations: A Review of Its Measurement and Modeling A. Nair & F. Yu 10.3390/atmos11101092
111. Determination of atmospheric nitrogen deposition to a semi-natural peat bog site in an intensively managed agricultural landscape M. Hurkuck et al. 10.1016/j.atmosenv.2014.08.034
112. High temporal resolution modelling of environmentally-dependent seabird ammonia emissions: Description and testing of the GUANO model S. Riddick et al. 10.1016/j.atmosenv.2017.04.020
113. A comparison of observed and parameterized SO2 dry deposition over a grassy clearing in Duke Forest L. Myles et al. 10.1016/j.atmosenv.2011.11.059
114. Summertime Soil-Atmosphere Ammonia Exchange in the Colorado Rocky Mountain Front Range Pine Forest A. Hrdina et al. 10.3390/soilsystems3010015
115. On the transfer of dense gases from a forest sub-canopy into the wind field above B. Hicks et al. 10.1016/j.atmosenv.2023.120056
116. Examining the competing effects of contemporary land management vs. land cover changes on global air quality A. Wong & J. Geddes 10.5194/acp-21-16479-2021
117. Canopy Uptake of 15NH3 by Four Temperate Tree Species and the Interaction with Leaf Properties S. Adriaenssens et al. 10.1007/s11270-012-1304-4
118. Changes in United States deposition of nitrogen and sulfur compounds over five decades from 1970 to 2020 U. Nopmongcol et al. 10.1016/j.atmosenv.2019.04.018
119. Present and future nitrogen deposition to national parks in the United States: critical load exceedances R. Ellis et al. 10.5194/acp-13-9083-2013
120. Incorporation of Remote PM2.5 Concentrations into the Downscaler Model for Spatially Fused Air Quality Surfaces B. Gantt et al. 10.3390/atmos11010103
121. 3-D agricultural air quality modeling: Impacts of NH3/H2S gas–phase reactions and bi-directional exchange of NH3 K. Wang & Y. Zhang 10.1016/j.atmosenv.2014.09.010
122. Remediation of atmospheric sulfur and ammonia by wetland plants: development of a study method M. Kanté et al. 10.1080/15226514.2021.1949264
123. Nitrogen deposition in forests: Statistical modeling of total deposition from throughfall loads S. Braun et al. 10.3389/ffgc.2022.1062223
124. An Integrated Agriculture, Atmosphere, and Hydrology Modeling System for Ecosystem Assessments L. Ran et al. 10.1029/2019MS001708
125. Multiple Gap-Filling for Eddy Covariance Datasets A. Lucas-Moffat et al. 10.2139/ssrn.4065277
126. Parameterization of gaseous dry deposition in atmospheric chemistry models: Sensitivity to aerodynamic resistance formulations under statically stable conditions K. Toyota et al. 10.1016/j.atmosenv.2016.09.055
127. Considerations for evaluating green infrastructure impacts in microscale and macroscale air pollution dispersion models A. Tiwari et al. 10.1016/j.scitotenv.2019.03.350
128. First Assessment of Inorganic Nitrogen Deposition Budget Following the Impoundment of a Subtropical Hydroelectric Reservoir (Nam Theun 2, Lao PDR) M. Adon et al. 10.1029/2018JD029027
129. Development and evaluation of an advanced National Air Quality Forecasting Capability using the NOAA Global Forecast System version 16 P. Campbell et al. 10.5194/gmd-15-3281-2022
130. Effects of aerosol dynamics and gas–particle conversion on dry deposition of inorganic reactive nitrogen in a temperate forest G. Katata et al. 10.5194/acp-20-4933-2020
131. Ammonia deposition in the neighbourhood of an intensive cattle feedlot in Victoria, Australia J. Shen et al. 10.1038/srep32793
132. A roadmap to estimating agricultural ammonia volatilization over Europe using satellite observations and simulation data R. Abeed et al. 10.5194/acp-23-12505-2023
133. Advances in understanding, models and parameterizations of biosphere-atmosphere ammonia exchange C. Flechard et al. 10.5194/bg-10-5183-2013
134. Urine effects on grass and legume nitrogen isotopic composition: Pronounced short-term dynamics of δ15N B. Tonn et al. 10.1371/journal.pone.0210623
135. Implementation of a dynamical NH3 emissions parameterization in CMAQ for improving PM2.5 simulation in Taiwan C. Hsu et al. 10.1016/j.atmosenv.2019.116923
136. Evaluation of open- and closed-path sampling systems for the determination of emission rates of NH3 and CH4 with inverse dispersion modeling Y. Lemes et al. 10.5194/amt-16-1295-2023
137. Reconsidering emissions of ammonia from chemical fertilizer usage in Midwest USA S. Balasubramanian et al. 10.1002/2015JD023219
138. Spatial variations in soil and plant nitrogen levels caused by ammonia deposition near a cattle feedlot J. Shen et al. 10.1016/j.atmosenv.2017.12.022
139. Dry deposition of reactive nitrogen to European ecosystems: a comparison of inferential models across the NitroEurope network C. Flechard et al. 10.5194/acp-11-2703-2011
140. Surface–atmosphere exchange of ammonia over peatland using QCL-based eddy-covariance measurements and inferential modeling U. Zöll et al. 10.5194/acp-16-11283-2016
141. Measurement and Modeling of N Balance Between Atmosphere and Biosphere over a Grazed Grassland (Bugacpuszta) in Hungary A. Machon et al. 10.1007/s11270-014-2271-8
142. Investigating the stomatal, cuticular and soil ammonia fluxes over a growing tritical crop under high acidic loads B. Loubet et al. 10.5194/bg-9-1537-2012
143. The influence of gas-particle partitioning and surface-atmosphere exchange on ammonia during BAQS-Met R. Ellis et al. 10.5194/acp-11-133-2011
144. The EMEP MSC-W chemical transport model – technical description D. Simpson et al. 10.5194/acp-12-7825-2012
145. Measurement and modelling of the dynamics of NH<sub>3</sub> surface–atmosphere exchange over the Amazonian rainforest R. Ramsay et al. 10.5194/bg-18-2809-2021
146. Model-Measurement Comparison of Ammonia Bi-Directional Air-Surface Exchange Fluxes over Agricultural Fields Z. He et al. 10.4236/acs.2013.34048
147. Assessing atmospheric nitrogen deposition to natural and semi-natural ecosystems – Experience from Danish studies using the DAMOS O. Hertel et al. 10.1016/j.atmosenv.2012.02.071
148. Quantifying spatial and seasonal variability in atmospheric ammonia with in situ and space-based observations R. Pinder et al. 10.1029/2010GL046146
149. Bi‐directional air‐surface exchange of atmospheric ammonia: A review of measurements and a development of a big‐leaf model for applications in regional‐scale air‐quality models L. Zhang et al. 10.1029/2009JD013589