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- Measurement report: The importance of biomass burning in light extinction
and direct radiative effect of urban aerosol during the COVID-19 lockdown
in Xi'an, China
Abstract: Measurement report: The importance of biomass burning in light extinction and direct radiative effect of urban aerosol during the COVID-19 lockdown in Xi'an, China
Jie Tian, Qiyuan Wang, Huikun Liu, Yongyong Ma, Suixin Liu, Yong Zhang, Weikang Ran, Yongming Han, and Junji Cao
Atmos. Chem. Phys., 22, 8369–8384, https://doi.org/10.5194/acp-22-8369-2022, 2022
We investigated aerosol optical properties and the direct radiative effect (DRE) at an urban site in China before and during the COVID-19 lockdown. The total light extinction coefficient (bext) decreased under emission control measures; however, bext from biomass burning increased due to the undiminished need for residential cooking and heating. Biomass burning, rather than traffic-related emissions, became the largest positive effect contributor to aerosol DRE in the lockdown.
PubDate: Wed, 29 Jun 2022 05:02:21 +020
DOI: 10.5194/acp-22-8369-2022 2022
- A machine learning approach to quantify meteorological drivers of ozone
pollution in China from 2015 to 2019
Abstract: A machine learning approach to quantify meteorological drivers of ozone pollution in China from 2015 to 2019
Xiang Weng, Grant L. Forster, and Peer Nowack
Atmos. Chem. Phys., 22, 8385–8402, https://doi.org/10.5194/acp-22-8385-2022, 2022
We use machine learning to quantify the meteorological drivers behind surface ozone variations in China between 2015 and 2019. Our novel approaches show improved performance when compared to previous analysis methods. We highlight that nonlinearity in driver relationships and the impacts of large-scale meteorological phenomena are key to understanding ozone pollution. Moreover, we find that almost half of the observed ozone trend between 2015 and 2019 might have been driven by meteorology.
PubDate: Wed, 29 Jun 2022 05:02:21 +020
DOI: 10.5194/acp-22-8385-2022 2022
- A Single Parameter Hygroscopicity Model for Functionalized and Insoluble
Aerosol Surfaces
Abstract: A Single Parameter Hygroscopicity Model for Functionalized and Insoluble Aerosol Surfaces
Chun-Ning Mao, Kanishk Gohil, and Akua Asa-Awuku
Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2022-339,2022
Preprint under review for ACP (discussion: open, 0 comments)
The impact of molecular level surface chemistry for aerosol water-uptake and droplet growth is not well understood. In this work we show changes in molecular level surface chemistry can be measured and quantified. In addition, we develop a single-parameter model, representing changes in aerosol chemistry that can be used in global climate models to reduce the uncertainty in aerosol-cloud predictions.
PubDate: Wed, 29 Jun 2022 05:02:21 +020
DOI: 10.5194/acp-2022-3392022
- Spatio-temporal variation of radionuclide dispersion from nuclear power
plant accidents using FLEXPART ensemble modeling
Abstract: Spatio-temporal variation of radionuclide dispersion from nuclear power plant accidents using FLEXPART ensemble modeling
Seyed Omid Nabavi, Theodoros Christoudias, Yiannis Proestos, Christos Fountoukis, Huda Al-Sulaiti, and Jos Lelieveld
Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2022-383,2022
Preprint under review for ACP (discussion: open, 0 comments)
We studied the diurnal and seasonal changes in the dispersion of radionuclides using a four-member ensemble based on FLEXPART and FLEXPAR-WRF. We found that simulations are affected by the spatio-temporal resolution of meteorological inputs, the seasonal and diurnal changes in meteorological conditions, and the simulation code of choice. The preparedness programs for potential nuclear accidents, the FLEXPART community, and radionuclide dispersion modelers may benefit from our findings.
PubDate: Wed, 29 Jun 2022 05:02:21 +020
DOI: 10.5194/acp-2022-3832022
- Temporal and vertical distributions of the occurrence of cirrus clouds
over a coastal station in the Indian monsoon region
Abstract: Temporal and vertical distributions of the occurrence of cirrus clouds over a coastal station in the Indian monsoon region
Saleem Ali, Sanjay Kumar Mehta, Aravindhavel Ananthavel, and Tondapu Venkata Ramesh Reddy
Atmos. Chem. Phys., 22, 8321–8342, https://doi.org/10.5194/acp-22-8321-2022, 2022
Multiple cirrus clouds frequently occur over regions of deep convection in the tropics. Tropical convection has a strong diurnal pattern, with peaks in the afternoon to early evening, over the continents. Continuous micropulse lidar observations over a coastal station in the Indian monsoon region enable us, for the first time, to demonstrate a robust diurnal pattern of single and multiple cirrus occurrences, with peaks during the late afternoon and early morning hours, respectively.
PubDate: Tue, 28 Jun 2022 05:02:21 +020
DOI: 10.5194/acp-22-8321-2022 2022
- A new assessment of global and regional budgets, fluxes, and lifetimes of
atmospheric reactive N and S gases and aerosols
Abstract: A new assessment of global and regional budgets, fluxes, and lifetimes of atmospheric reactive N and S gases and aerosols
Yao Ge, Massimo Vieno, David S. Stevenson, Peter Wind, and Mathew R. Heal
Atmos. Chem. Phys., 22, 8343–8368, https://doi.org/10.5194/acp-22-8343-2022, 2022
Reactive N and S gases and aerosols are critical determinants of air quality. We report a comprehensive analysis of the concentrations, wet and dry deposition, fluxes, and lifetimes of these species globally as well as for 10 world regions. We used the EMEP MSC-W model coupled with WRF meteorology and 2015 global emissions. Our work demonstrates the substantial regional variation in these quantities and the need for modelling to simulate atmospheric responses to precursor emissions.
PubDate: Tue, 28 Jun 2022 05:02:21 +020
DOI: 10.5194/acp-22-8343-2022 2022
- Seasonal updraft speeds change cloud droplet number concentrations in
low-level clouds over the western North Atlantic
Abstract: Seasonal updraft speeds change cloud droplet number concentrations in low-level clouds over the western North Atlantic
Simon Kirschler, Christiane Voigt, Bruce Anderson, Ramon Campos Braga, Gao Chen, Andrea F. Corral, Ewan Crosbie, Hossein Dadashazar, Richard A. Ferrare, Valerian Hahn, Johannes Hendricks, Stefan Kaufmann, Richard Moore, Mira L. Pöhlker, Claire Robinson, Amy J. Scarino, Dominik Schollmayer, Michael A. Shook, K. Lee Thornhill, Edward Winstead, Luke D. Ziemba, and Armin Sorooshian
Atmos. Chem. Phys., 22, 8299–8319, https://doi.org/10.5194/acp-22-8299-2022, 2022
In this study we show that the vertical velocity dominantly impacts the cloud droplet number concentration (NC) of low-level clouds over the western North Atlantic in the winter and summer season, while the cloud condensation nuclei concentration, aerosol size distribution and chemical composition impact NC within a season. The observational data presented in this study can evaluate and improve the representation of aerosol–cloud interactions for a wide range of conditions.
PubDate: Tue, 28 Jun 2022 05:02:21 +020
DOI: 10.5194/acp-22-8299-2022 2022
- Measurement Report: Increasing trend of atmospheric ion concentrations in
the boreal forest
Abstract: Measurement Report: Increasing trend of atmospheric ion concentrations in the boreal forest
Juha Sulo, Janne Lampilahti, Xuemeng Chen, Jenni Kontkanen, Tuomo Nieminen, Veli-Matti Kerminen, Tuukka Petäjä, Markku Kulmala, and Katrianne Lehtipalo
Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2022-392,2022
Preprint under review for ACP (discussion: open, 0 comments)
We measured atmospheric ion concentrations continuously in a boreal forest between 2005 and 2021 and observed an increasing inter-annual trend. The increase in cluster ion concentrations can be largely explained by overall decreasing level of anthropogenic aerosols in the boreal forest. This suggests that the role of ions in atmospheric new particle formation may be more important in the future.
PubDate: Tue, 28 Jun 2022 05:02:21 +020
DOI: 10.5194/acp-2022-3922022
- Long-term Atmospheric Deposition of Nitrogen and Sulfur and Assessment of
Critical Loads Exceedances at Canadian Rural Locations
Abstract: Long-term Atmospheric Deposition of Nitrogen and Sulfur and Assessment of Critical Loads Exceedances at Canadian Rural Locations
Irene Cheng, Leiming Zhang, Zhuanshi He, Hazel Cathcart, Daniel Houle, Amanda Cole, Jian Feng, Jason O'Brien, Anne Marie Macdonald, Julian Aherne, and Jeffrey Brook
Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2022-400,2022
Preprint under review for ACP (discussion: open, 0 comments)
Nitrogen (N) and sulfur (S) deposition decreased significantly at 14 Canadian sites during 2000–2018. The greatest decline was observed in southeastern Canada owing to regional SO2 and NOx reductions. Wet deposition was more important than dry deposition, comprising 71–95 % of total N and 45–89 % of total S deposition. While critical loads (CL) were exceeded at a few sites in the early 2000s, acidic deposition has declined below CL after 2012, which signifies recovery from legacy acidification.
PubDate: Tue, 28 Jun 2022 05:02:21 +020
DOI: 10.5194/acp-2022-4002022
- On the fingerprint of the Antarctica ozone hole in ice core nitrate
isotopes: a case study based on a South Pole ice core
Abstract: On the fingerprint of the Antarctica ozone hole in ice core nitrate isotopes: a case study based on a South Pole ice core
Yanzhi Cao, Zhuang Jiang, Becky Alexander, Jihong Cole-Dai, Joel Savarino, Joseph Erbland, and Lei Geng
Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2022-417,2022
Preprint under review for ACP (discussion: open, 0 comments)
We investigate the potential of ice-core preserved nitrate isotopes as proxies of stratospheric ozone variability by measuring nitrate isotopes in a shallow ice core from the South Pole. The large variability of snow accumulation rate and its slight increase after the 1970s masked any signals caused by ozone hole. Meanwhile, the nitrate oxygen isotope decrease may reflect changes in the atmospheric oxidation environment in the Southern Ocean.
PubDate: Tue, 28 Jun 2022 05:02:21 +020
DOI: 10.5194/acp-2022-4172022
- Supercooled liquid water clouds observed over Dome C, Antarctica:
temperature sensitivity and surface radiation impact
Abstract: Supercooled liquid water clouds observed over Dome C, Antarctica: temperature sensitivity and surface radiation impact
Philippe Ricaud, Massimo Del Guasta, Angelo Lupi, Romain Roehrig, Eric Bazile, Pierre Durand, Jean-Luc Attié, Alessia Nicosia, and Paolo Grigioni
Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2022-433,2022
Preprint under review for ACP (discussion: open, 0 comments)
Clouds affect the Earth climate with an impact that depends on the cloud type (solid/liquid water). From observations made at Concordia (Antarctica), we show that, in supercooled liquid water (liquid water for temperature less than 0 °C) clouds (SLWCs), temperature increases with liquid water and SLWCs positively impact the net surface radiation, up to 30 W m-2 extrapolated over the Antarctic Peninsula. This stresses the importance of accurately modelling SLWCs to forecast the Earth Climate.
PubDate: Tue, 28 Jun 2022 05:02:21 +020
DOI: 10.5194/acp-2022-4332022
- Seasonal modeling analysis of nitrate formation pathways in Yangtze River
Delta region, China
Abstract: Seasonal modeling analysis of nitrate formation pathways in Yangtze River Delta region, China
Jinjin Sun, Momei Qin, Xiaodong Xie, Wenxing Fu, Yang Qin, Li Sheng, Lin Li, Jingyi Li, Ishaq Dimeji Sulaymon, Lei Jiang, Lin Huang, Xingna Yu, and Jianlin Hu
Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2022-426,2022
Preprint under review for ACP (discussion: open, 0 comments)
NO3- has become the dominant and the least reduced chemical component of fine particulate matter in China. NO3- formation is mostly in the NH3-rich regime in YRD. OH+NO2 pathway contributes to 60–83 % of the TNO3 production rates, and the N2O5 heterogeneous pathway contributes to 10–36 %. N2O5 heterogeneous pathway becomes more important in cold seasons. Local emissions and regional transportation contribute to YRD NO3- concentrations by 50–62 % and 38–50 %, respectively.
PubDate: Tue, 28 Jun 2022 05:02:21 +020
DOI: 10.5194/acp-2022-4262022
- Assessing the representativity of NH3 measurements influenced by
boundary-layer dynamics and the turbulent dispersion of a nearby emission
source
Abstract: Assessing the representativity of NH3 measurements influenced by boundary-layer dynamics and the turbulent dispersion of a nearby emission source
Ruben B. Schulte, Margreet C. van Zanten, Bart J. H. van Stratum, and Jordi Vilà-Guerau de Arellano
Atmos. Chem. Phys., 22, 8241–8257, https://doi.org/10.5194/acp-22-8241-2022, 2022
We present a fine-scale simulation framework, utilizing large-eddy simulations, to assess NH3 measurements influenced by boundary-layer dynamics and turbulent dispersion of a nearby emission source. The minimum required distance from an emission source differs for concentration and flux measurements, from 0.5–3.0 km and 0.75–4.5 km, respectively. The simulation framework presented here proves to be a powerful and versatile tool for future NH3 research at high spatio-temporal resolutions.
PubDate: Mon, 27 Jun 2022 05:57:39 +020
DOI: 10.5194/acp-22-8241-2022 2022
- A sulfuric acid nucleation potential model for the atmosphere
Abstract: A sulfuric acid nucleation potential model for the atmosphere
Jack S. Johnson and Coty N. Jen
Atmos. Chem. Phys., 22, 8287–8297, https://doi.org/10.5194/acp-22-8287-2022, 2022
Sulfuric acid nucleation forms particles in Earth's atmosphere that influence cloud formation and climate. This study introduces the Nucleation Potential Model, which simplifies the diverse reactions between sulfuric acid and numerous precursor gases to predict nucleation rates. Results show that the model is capable of estimating the potency and concentration of mixtures of precursor gases from laboratory and field observations and can be used to model nucleation across diverse environments.
PubDate: Mon, 27 Jun 2022 05:57:39 +020
DOI: 10.5194/acp-22-8287-2022 2022
- An evaluation of the liquid cloud droplet effective radius derived from
MODIS, airborne remote sensing, and in situ measurements from CAMP2Ex
Abstract: An evaluation of the liquid cloud droplet effective radius derived from MODIS, airborne remote sensing, and in situ measurements from CAMP2Ex
Dongwei Fu, Larry Di Girolamo, Robert M. Rauber, Greg M. McFarquhar, Stephen W. Nesbitt, Jesse Loveridge, Yulan Hong, Bastiaan van Diedenhoven, Brian Cairns, Mikhail D. Alexandrov, Paul Lawson, Sarah Woods, Simone Tanelli, Sebastian Schmidt, Chris Hostetler, and Amy Jo Scarino
Atmos. Chem. Phys., 22, 8259–8285, https://doi.org/10.5194/acp-22-8259-2022, 2022
Satellite-retrieved cloud microphysics are widely used in climate research because of their central role in water and energy cycles. Here, we provide the first detailed investigation of retrieved cloud drop sizes from in situ and various satellite and airborne remote sensing techniques applied to real cumulus cloud fields. We conclude that the most widely used passive remote sensing method employed in climate research produces high biases of 6–8 µm (60 %–80 %) caused by 3-D radiative effects.
PubDate: Mon, 27 Jun 2022 05:57:39 +020
DOI: 10.5194/acp-22-8259-2022 2022
- Investigating the cloud radiative effect of Arctic cirrus
Abstract: Investigating the cloud radiative effect of Arctic cirrus
Andreas Marsing, Ralf Meerkötter, Romy Heller, Stefan Kaufmann, Tina Jurkat-Witschas, Martina Krämer, Christian Rolf, and Christiane Voigt
Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2022-395,2022
Preprint under review for ACP (discussion: open, 0 comments)
We employ highly resolved aircraft measurements of profiles of the ice water content (IWC) in Arctic cirrus clouds in winter and spring, where solar irradiation is low. Using calculations on the transfer of radiation, we assess the cloud radiative effect over different surfaces like snow or ocean. The variability of IWC in the clouds affects their overall radiative effect and drives internal processes. This helps in understanding the role of cirrus in a rapidly changing Arctic environment.
PubDate: Mon, 27 Jun 2022 05:57:39 +020
DOI: 10.5194/acp-2022-3952022
- Aerosol activation characteristics and prediction at the central European
ACTRIS research station Melpitz, Germany
Abstract: Aerosol activation characteristics and prediction at the central European ACTRIS research station Melpitz, Germany
Yuan Wang, Silvia Henning, Laurent Poulain, Chunsong Lu, Frank Stratmann, Yuying Wang, Shengjie Niu, Mira L. Pöhlker, Hartmut Herrmann, and Alfred Wiedensohler
Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2022-427,2022
Preprint under review for ACP (discussion: open, 0 comments)
Aerosol particle activation affects cloud, precipitation, radiation, and thus the global climate. Its long-term measurements are important but still scarce. In this study, more than 4-year measurements at a central European station were analyzed. The overall characteristics and seasonal changes of aerosol particle activation are summarized. The power-law fit between particle hygroscopicity factor and diameter was recommended for predicting CCN number concentration.
PubDate: Mon, 27 Jun 2022 05:57:39 +020
DOI: 10.5194/acp-2022-4272022
- An assessment of land energy balance over East Asia from multiple lines
and the roles of Tibet Plateau, aerosols, and clouds
Abstract: An assessment of land energy balance over East Asia from multiple lines and the roles of Tibet Plateau, aerosols, and clouds
Qiuyan Wang, Hua Zhang, Su Yang, Qi Chen, Xixun Zhou, Bing Xie, Yuying Wang, Guangyu Shi, and Martin Wild
Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2022-451,2022
Preprint under review for ACP (discussion: open, 0 comments)
The present-day land energy balance over East Asia is estimated for the first time. Results indicate that high aerosol loadings, clouds, and the Tibet Plateau (TP) over East Asia play vital roles in the shortwave budgets, while the TP is responsible for the longwave budgets during this regional energy budget assessment. This study provides a perspective to understand fully how the potential factors influence the diversifying regional energy budget assessments.
PubDate: Mon, 27 Jun 2022 05:57:39 +020
DOI: 10.5194/acp-2022-4512022
- Daily evolution of VOCs in Beijing: chemistry, emissions, transport, and
policy implications
Abstract: Daily evolution of VOCs in Beijing: chemistry, emissions, transport, and policy implications
Marios Panagi, Roberto Sommariva, Zoë L. Fleming, Paul S. Monks, Gongda Lu, Eloise A. Marais, James R. Hopkins, Alastair C. Lewis, Qiang Zhang, James D. Lee, Freya A. Squires, Lisa K. Whalley, Eloise J. Slater, Dwayne E. Heard, Robert Woodward-Massey, Chunxiang Ye, and Joshua D. Vande Hey
Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2022-379,2022
Preprint under review for ACP (discussion: open, 0 comments)
A dispersion model and a box model were combined to investigate the evolution of VOCs in Beijing once they are emitted from anthropogenic sources. It was determined that during the winter time the VOC concentrations in Beijing are driven predominantly by sources within Beijing and by a combination of transport and chemistry during the summer. Furthermore, the results in the paper highlight the need for a season specific policy.
PubDate: Mon, 27 Jun 2022 05:57:39 +020
DOI: 10.5194/acp-2022-3792022
- Transport of substantial stratospheric ozone to the surface by a dying
typhoon and shallow convection
Abstract: Transport of substantial stratospheric ozone to the surface by a dying typhoon and shallow convection
Zhixiong Chen, Jane Liu, Xiushu Qie, Xugeng Cheng, Yukun Shen, Mengmiao Yang, Rubin Jiang, and Xiangke Liu
Atmos. Chem. Phys., 22, 8221–8240, https://doi.org/10.5194/acp-22-8221-2022, 2022
A vigorous surface ozone surge event of stratospheric origin occurred in the North China Plain at night. Surface ozone concentrations were 40–50 ppbv higher than the corresponding monthly mean, whereas surface carbon monoxide concentrations declined abruptly, which confirmed the direct stratospheric intrusions to the surface. We further addressed the notion that a combined effect of the dying typhoon and mesoscale convective systems was responsible for this vigorous ozone surge.
PubDate: Fri, 24 Jun 2022 02:43:40 +020
DOI: 10.5194/acp-22-8221-2022 2022
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