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- Ozone–gravity wave interaction in the upper stratosphere/lower
mesosphere
Abstract: Ozone–gravity wave interaction in the upper stratosphere/lower mesosphere
Axel Gabriel
Atmos. Chem. Phys., 22, 10425–10441, https://doi.org/10.5194/acp-22-10425-2022, 2022
Recent measurements show some evidence that the amplitudes of atmospheric gravity waves (horizontal wavelengths of 100–2000 km), which propagate from the troposphere (0–10 km) to the stratosphere and mesosphere (10–100 km), increase more strongly with height during daytime than during nighttime. This study shows that ozone–temperature coupling in the upper stratosphere can principally produce such an amplification. The results will help to improve atmospheric circulation models.
PubDate: 2022-08-16T23:29:24+02:00
- Columnar and surface urban aerosol in the Moscow megacity according to
measurements and simulations with the COSMO-ART model
Abstract: Columnar and surface urban aerosol in the Moscow megacity according to measurements and simulations with the COSMO-ART model
Natalia E. Chubarova, Heike Vogel, Elizaveta E. Androsova, Alexander A. Kirsanov, Olga B. Popovicheva, Bernhard Vogel, and Gdaliy S. Rivin
Atmos. Chem. Phys., 22, 10443–10466, https://doi.org/10.5194/acp-22-10443-2022, 2022
Effects of urban aerosol pollution in Moscow were analyzed using the COSMO-ART chemical transport model and intensive measurement campaigns. We show that urban aerosol comprises about 15–20% of columnar aerosol content, consisting mainly of fine aerosol mode. The black carbon (BC) fraction is about 5 %, depending on particle dispersion intensity (IPD). The BC fraction low value explains weak absorbing properties of the Moscow atmosphere. IPD also defines the daily cycle of urban aerosol species.
PubDate: 2022-08-16T23:29:24+02:00
- Long-range transport of Asian dust to the Arctic: identification of
transport pathways, evolution of aerosol optical properties, and impact
assessment on surface albedo changes
Abstract: Long-range transport of Asian dust to the Arctic: identification of transport pathways, evolution of aerosol optical properties, and impact assessment on surface albedo changes
Xiaoxi Zhao, Kan Huang, Joshua S. Fu, and Sabur F. Abdullaev
Atmos. Chem. Phys., 22, 10389–10407, https://doi.org/10.5194/acp-22-10389-2022, 2022
Long-range transport of Asian dust to the Arctic was considered an important source of Arctic air pollution. Different transport routes to the Arctic had divergent effects on the evolution of aerosol properties. Depositions of long-range-transported dust particles can reduce the Arctic surface albedo considerably. This study implied that the ubiquitous long-transport dust from China exerted considerable aerosol indirect effects on the Arctic and may have potential biogeochemical significance.
PubDate: 2022-08-15T23:29:24+02:00
- Sources and processes of water-soluble and water-insoluble organic aerosol
in cold season in Beijing, China
Abstract: Sources and processes of water-soluble and water-insoluble organic aerosol in cold season in Beijing, China
Zhiqiang Zhang, Yele Sun, Chun Chen, Bo You, Aodong Du, Weiqi Xu, Yan Li, Zhijie Li, Lu Lei, Wei Zhou, Jiaxing Sun, Yanmei Qiu, Lianfang Wei, Pingqing Fu, and Zifa Wang
Atmos. Chem. Phys., 22, 10409–10423, https://doi.org/10.5194/acp-22-10409-2022, 2022
We present a comprehensive characterization of water-soluble organic aerosol and the first mass spectral characterization of water-insoluble organic aerosol in the cold season in Beijing by integrating online and offline aerosol mass spectrometer measurements. WSOA comprised dominantly secondary OA and showed large changes during the transition season from autumn to winter. WIOA was characterized by prominent hydrocarbon ions series, low oxidation states, and significant day–night differences.
PubDate: 2022-08-15T23:29:24+02:00
- Nonlinear resonant interactions of atmospheric tides with annual
oscillation based on meteor radar observation and reanalysis data
Abstract: Nonlinear resonant interactions of atmospheric tides with annual oscillation based on meteor radar observation and reanalysis data
Xiansi Huang, Kaiming Huang, Hao Cheng, Shaodong Zhang, Wei Cheng, Chunming Huang, and Yun Gong
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-407,2022
Preprint under review for ACP (discussion: open, 1 comment)
Using radar observations and reanalysis data for 9 years, we demonstrate clearly for the first time that resonant interactions between tides and annual and semiannual oscillations do occur in the mesosphere and lower thermosphere. The resonant matching conditions of frequency and wavenumber are exactly satisfied for the interacting triad. At some altitudes, the secondary waves are stronger than the tides, thus in tidal studies, the secondary waves may be mistaken for the tides if no carefully.
PubDate: 2022-08-15T23:29:24+02:00
- Characterization of Errors in Satellite-based HCHO / NO2 Tropospheric
Column Ratios with Respect to Chemistry, Column to PBL Translation,
Spatial Representation, and Retrieval Uncertainties
Abstract: Characterization of Errors in Satellite-based HCHO / NO2 Tropospheric Column Ratios with Respect to Chemistry, Column to PBL Translation, Spatial Representation, and Retrieval Uncertainties
Amir H. Souri, Matthew S. Johnson, Glenn M. Wolfe, James H. Crawford, Alan Fried, Armin Wisthaler, William H. Brune, Donald R. Blake, Andrew J. Weinheimer, Tijl Verhoelst, Steven Compernolle, Gaia Pinardi, Corinne Vigouroux, Bavo Langerock, Sungyeon Choi, Lok Lamsal, Lei Zhu, Shuai Sun, Ronald C. Cohen, Kyung-Eun Min, Changmin Cho, Sajeev Philip, Xiong Liu, and Kelly Chance
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-410,2022
Preprint under review for ACP (discussion: open, 0 comments)
We have rigorously characterized different sources of error in satellite-based HCHO / NO2 tropospheric columns, a widely used metric for diagnosing the near-surface ozone sensitivity. Specifically, the errors were categorized/quantified into i) an inherent chemistry error, ii) the decoupled relationship between columns and the near-surface concentration, iii) the spatial representativeness error of ground satellite pixels, and iv) the satellite retrieval errors.
PubDate: 2022-08-15T23:29:24+02:00
- Product distribution, kinetics, and aerosol formation from the OH
oxidation of dimethyl sulfide under different RO2 regimes
Abstract: Product distribution, kinetics, and aerosol formation from the OH oxidation of dimethyl sulfide under different RO2 regimes
Qing Ye, Matthew B. Goss, Jordan E. Krechmer, Francesca Majluf, Alexander Zaytsev, Yaowei Li, Joseph R. Roscioli, Manjula Canagaratna, Frank N. Keutsch, Colette L. Heald, and Jesse H. Kroll
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-566,2022
Preprint under review for ACP (discussion: open, 0 comments)
The atmospheric oxidation of dimethyl sulfide (DMS) represents a major natural source of sulfate aerosols, and thus plays an important role in global aerosol climate effects. However, the mechanism is poorly constrained. In this work, laboratory measurements were conducted to comprehensively investigate DMS oxidation products. The results show that peroxy radical (RO2) fate has a controlling influence on product distributions, and the isomerization of RO2 suppresses aerosol formation.
PubDate: 2022-08-15T23:29:24+02:00
- Air quality impacts of COVID-19 lockdown measures detected from space
using high spatial resolution observations of multiple trace gases from
Sentinel-5P/TROPOMI
Abstract: Air quality impacts of COVID-19 lockdown measures detected from space using high spatial resolution observations of multiple trace gases from Sentinel-5P/TROPOMI
Pieternel F. Levelt, Deborah C. Stein Zweers, Ilse Aben, Maite Bauwens, Tobias Borsdorff, Isabelle De Smedt, Henk J. Eskes, Christophe Lerot, Diego G. Loyola, Fabian Romahn, Trissevgeni Stavrakou, Nicolas Theys, Michel Van Roozendael, J. Pepijn Veefkind, and Tijl Verhoelst
Atmos. Chem. Phys., 22, 10319–10351, https://doi.org/10.5194/acp-22-10319-2022, 2022
Using the COVID-19 lockdown periods as an example, we show how Sentinel-5P/TROPOMI trace gas data (NO2, SO2, CO, HCHO and CHOCHO) can be used to understand impacts on air quality for regions and cities around the globe. We also provide information for both experienced and inexperienced users about how we created the data using state-of-the-art algorithms, where to get the data, methods taking meteorological and seasonal variability into consideration, and insights for future studies.
PubDate: 2022-08-12T23:59:09+02:00
- Disentangling the impact of air–sea interaction and boundary layer cloud
formation on stable water isotope signals in the warm sector of a Southern
Ocean cyclone
Abstract: Disentangling the impact of air–sea interaction and boundary layer cloud formation on stable water isotope signals in the warm sector of a Southern Ocean cyclone
Iris Thurnherr and Franziska Aemisegger
Atmos. Chem. Phys., 22, 10353–10373, https://doi.org/10.5194/acp-22-10353-2022, 2022
Stable water isotopes in marine boundary layer vapour are strongly influenced by the strength of air–sea fluxes. Here, we investigate a distinct vapour isotope signal observed in the warm sector of Southern Ocean cyclones. Single-process air parcel models are used together with high-resolution isotope-enabled simulations with the weather prediction model COSMOiso to improve our understanding of the importance of air–sea fluxes for the moisture cycling in the context of extratropical cyclones.
PubDate: 2022-08-12T23:59:09+02:00
- Estimating global ammonia (NH3) emissions based on IASI observations from
2008 to 2018
Abstract: Estimating global ammonia (NH3) emissions based on IASI observations from 2008 to 2018
Zhenqi Luo, Yuzhong Zhang, Wei Chen, Martin Van Damme, Pierre-François Coheur, and Lieven Clarisse
Atmos. Chem. Phys., 22, 10375–10388, https://doi.org/10.5194/acp-22-10375-2022, 2022
We quantify global ammonia (NH3) emissions over the period from 2008 to 2018 using an improved fast top-down method that incorporates Infrared AtmosphericSounding Interferometer (IASI) satellite observations and GEOS-Chem atmospheric chemical simulations. The top-down analysis finds a global total NH3 emission that is 30 % higher than the bottom-up estimate, largely reconciling a large discrepancy of more than a factor of 2 found in previous top-down studies using the same satellite data.
PubDate: 2022-08-12T23:59:09+02:00
- New particle formation and growth during summer in an urban environment: a
dual chamber study
Abstract: New particle formation and growth during summer in an urban environment: a dual chamber study
Spiro D. Jorga, Kalliopi Florou, David Patoulias, and Spyros N. Pandis
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-554,2022
Preprint under review for ACP (discussion: open, 0 comments)
We take advantage of this unexpected low new particle formation frequency in Greece and use a dual atmospheric simulation chamber system with starting point ambient air in an effort to gain insights about the chemical species that is limiting nucleation in this area. A potential nucleation precursor, ammonia, was added in one of the chambers while the other one was used as a reference. The addition of ammonia assisted in new particle formation in almost 50 % of the conducted experiments.
PubDate: 2022-08-12T23:59:09+02:00
- Microphysical Characteristics of Super Typhoon Lekima (2019) and Its
Impacts on Polarimetric Radar Remote Sensing of Precipitation
Abstract: Microphysical Characteristics of Super Typhoon Lekima (2019) and Its Impacts on Polarimetric Radar Remote Sensing of Precipitation
Yabin Gou, Haonan Chen, and Lulin Xue
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-495,2022
Preprint under review for ACP (discussion: open, 0 comments)
This article investigates the complex precipitation microphysics associated with super typhoon Lekima (2019) using a host of in situ and remote sensing observations, including rain gauge and disdrometer data, and polarimetric radar observations. The impacts of precipitation microphysics on multi-source data consistency and radar precipitation estimation are quantified. It is concluded that the dynamical precipitation microphysical processes must be considered in radar precipitation estimation.
PubDate: 2022-08-12T23:59:09+02:00
- Elucidate the Formation Mechanism of Particulate Nitrate Based on Direct
Radical Observations in Yangtze River Delta summer 2019
Abstract: Elucidate the Formation Mechanism of Particulate Nitrate Based on Direct Radical Observations in Yangtze River Delta summer 2019
Tianyu Zhai, Keding Lu, Haichao Wang, Shengrong Lou, Xiaorui Chen, Renzhi Hu, and Yuanhang Zhang
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-548,2022
Preprint under review for ACP (discussion: open, 0 comments)
Particulate nitrate is a growing issue in the air pollution. Based on a comprehensive field measurement, we show a heavy nitrate pollution in eastern China in summer. OH reacts with NO2 at daytime dominates nitrate formation on clean days while N2O5 hydrolysis largely enhanced and become comparable with that of OH reacts with O2 during polluted days (47.1 % and 52.9 %). Model simulation indicates that VOCs: NOx = 2:1 is effective to mitigate the O3 and nitrate pollution coordinately.
PubDate: 2022-08-12T23:59:09+02:00
- Chemically distinct particle phase emissions from highly controlled
pyrolysis of three wood types
Abstract: Chemically distinct particle phase emissions from highly controlled pyrolysis of three wood types
Anita M. Avery, Mariam Fawaz, Leah R. Williams, Tami Bond, and Timothy B. Onasch
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-535,2022
Preprint under review for ACP (discussion: open, 0 comments)
Pyrolysis is the thermal decomposition of fuels like wood, which occurs during combustion or as an isolated process. During combustion, some pyrolysis products are emitted directly, while others are oxidized in the combustion process. This work describes the chemical composition of particle-phase pyrolysis products in order to inform both the uncombusted emissions from wild fires, and the fuel that participates in combustion.
PubDate: 2022-08-12T23:59:09+02:00
- Canadian and Alaskan wildfire smoke particle properties, their evolution,
and controlling factors, from satellite observations
Abstract: Canadian and Alaskan wildfire smoke particle properties, their evolution, and controlling factors, from satellite observations
Katherine T. Junghenn Noyes, Ralph A. Kahn, James A. Limbacher, and Zhanqing Li
Atmos. Chem. Phys., 22, 10267–10290, https://doi.org/10.5194/acp-22-10267-2022, 2022
We compare retrievals of wildfire smoke particle size, shape, and light absorption from the MISR satellite instrument to modeling and other satellite data on land cover type, drought conditions, meteorology, and estimates of fire intensity (fire radiative power – FRP). We find statistically significant differences in the particle properties based on burning conditions and land cover type, and we interpret how changes in these properties point to specific aerosol aging mechanisms.
PubDate: 2022-08-11T23:59:09+02:00
- Measurement report: Size-resolved chemical characterisation of aerosols in
low-income urban settlements in South Africa
Abstract: Measurement report: Size-resolved chemical characterisation of aerosols in low-income urban settlements in South Africa
Constance K. Segakweng, Pieter G. van Zyl, Cathy Liousse, Johan P. Beukes, Jan-Stefan Swartz, Eric Gardrat, Maria Dias-Alves, Brigitte Language, Roelof P. Burger, and Stuart J. Piketh
Atmos. Chem. Phys., 22, 10291–10317, https://doi.org/10.5194/acp-22-10291-2022, 2022
A detailed size-resolved assessment of the chemical characteristics of outdoor and indoor aerosols collected in low-income urban settlements in South Africa indicated the significance of household combustion for cooking and space heating – an important source of pollutants in the developing world – to atmospheric chemical composition. The regional impact of industrial sources in the highly industrialised and densely populated north-eastern interior of South Africa was also evident.
PubDate: 2022-08-11T23:59:09+02:00
- Decoupling impacts of weather conditions on interannual variations in
concentrations of criteria air pollutants in south China – constraining
analysis uncertainties by using multiple analysis tools
Abstract: Decoupling impacts of weather conditions on interannual variations in concentrations of criteria air pollutants in south China – constraining analysis uncertainties by using multiple analysis tools
Yu Lin, Leiming Zhang, Qinchu Fan, He Meng, Yang Gao, Huiwang Gao, and Xiaohong Yao
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-502,2022
Preprint under review for ACP (discussion: open, 0 comments)
In order to assess the effectiveness of existing emission control strategies, we extracted emission-driven trends in concentrations of air pollutants by separately applying three methods and analyzed their uncertainties. We found consistent trends in approximately 70 % of the study cases, the effects of emission-driven took the lead in the overall changes. The effects of mitigation measures and weather perturbations were also discussed.
PubDate: 2022-08-11T23:59:09+02:00
- Comprehensive characterization of the particulate IVOCs and SVOCs from
heavy-duty diesel vehicles using two-dimensional gas chromatography
time-of-flight mass spectrometry
Abstract: Comprehensive characterization of the particulate IVOCs and SVOCs from heavy-duty diesel vehicles using two-dimensional gas chromatography time-of-flight mass spectrometry
Xiao He, Xuan Zheng, Shaojun Zhang, Xuan Wang, Ting Chen, Xiao Zhang, Guanghan Huang, Yihuan Cao, Liqiang He, Xubing Cao, Yuan Cheng, Shuxiao Wang, and Ye Wu
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-468,2022
Preprint under review for ACP (discussion: open, 0 comments)
With the use of two-dimensional gas chromatography time-of-flight mass spectrometry (GC × GC ToF-MS), we successfully give a comprehensive characterization of the particulate I/SVOCs emitted from heavy-duty diesel vehicles. I/SVOCs are speciated, identified, and quantified based on the patterns of the mass spectrum and the gas-particle partitioning are fully addressed.
PubDate: 2022-08-11T23:59:09+02:00
- Exploring relations between cloud morphology, cloud phase, and cloud
radiative properties in Southern Ocean's stratocumulus clouds
Abstract: Exploring relations between cloud morphology, cloud phase, and cloud radiative properties in Southern Ocean's stratocumulus clouds
Jessica Danker, Odran Sourdeval, Isabel L. McCoy, Robert Wood, and Anna Possner
Atmos. Chem. Phys., 22, 10247–10265, https://doi.org/10.5194/acp-22-10247-2022, 2022
Using spaceborne lidar-radar retrievals, we show that seasonal changes in cloud phase outweigh changes in cloud-phase statistics across cloud morphologies at given cloud-top temperatures. These results show that cloud morphology does not seem to pose a primary constraint on cloud-phase statistics in the Southern Ocean. Meanwhile, larger changes in in-cloud albedo across cloud morphologies are observed in supercooled liquid rather than mixed-phase stratocumuli.
PubDate: 2022-08-10T00:28:03+02:00
- Simulating wildfire emissions and plume rise using geostationary satellite
fire radiative power measurements: a case study of the 2019 Williams Flats
fire
Abstract: Simulating wildfire emissions and plume rise using geostationary satellite fire radiative power measurements: a case study of the 2019 Williams Flats fire
Aditya Kumar, R. Bradley Pierce, Ravan Ahmadov, Gabriel Pereira, Saulo Freitas, Georg Grell, Chris Schmidt, Allen Lenzen, Joshua P. Schwarz, Anne E. Perring, Joseph M. Katich, John Hair, Jose L. Jimenez, Pedro Campuzano-Jost, and Hongyu Guo
Atmos. Chem. Phys., 22, 10195–10219, https://doi.org/10.5194/acp-22-10195-2022, 2022
We use the WRF-Chem model with new implementations of GOES-16 wildfire emissions and plume rise based on fire radiative power (FRP) to interpret aerosol observations during the 2019 NASA–NOAA FIREX-AQ field campaign and perform model evaluations. The model shows significant improvements in simulating the variety of aerosol loading environments sampled during FIREX-AQ. Our results also highlight the importance of accurate wildfire diurnal cycle and aerosol chemical mechanisms in models.
PubDate: 2022-08-10T00:28:03+02:00
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