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- An experimental study of the reactivity of terpinolene and
β-caryophyllene with the nitrate radical
Abstract: An experimental study of the reactivity of terpinolene and β-caryophyllene with the nitrate radical
Axel Fouqueau, Manuela Cirtog, Mathieu Cazaunau, Edouard Pangui, Jean-François Doussin, and Bénédicte Picquet-Varrault
Atmos. Chem. Phys., 22, 6411–6434, https://doi.org/10.5194/acp-22-6411-2022, 2022
Biogenic volatile organic compounds are intensely emitted by forests and crops and react with the nitrate radical during the nighttime to form functionalized products. The purpose of this study is to furnish kinetic and mechanistic data for terpinolene and β-caryophyllene, using simulation chamber experiments. Rate constants have been measured using both relative and absolute methods, and mechanistic studies have been conducted in order to identify and quantify the main reaction products.
PubDate: 2022-05-18T22:39:58+02:00
- Inverse modeling of the 2021 spring super dust storms in East Asia
Abstract: Inverse modeling of the 2021 spring super dust storms in East Asia
Jianbing Jin, Mijie Pang, Arjo Segers, Wei Han, Li Fang, Baojie Li, Haochuan Feng, Hai Xiang Lin, and Hong Liao
Atmos. Chem. Phys., 22, 6393–6410, https://doi.org/10.5194/acp-22-6393-2022, 2022
Super dust storms reappeared in East Asia last spring after being absent for one and a half decades. Accurate simulation of such super sandstorms is valuable, but challenging due to imperfect emissions. In this study, the emissions of these dust storms are estimated by assimilating multiple observations. The results reveal that emissions originated from both China and Mongolia. However, for northern China, long-distance transport from Mongolia contributes much more dust than Chinese deserts.
PubDate: 2022-05-18T22:39:58+02:00
- Detection of Stratospheric Air Intrusion Events From Ground-based
High-resolution 10Be / 7Be by Accelerator Mass Spectrometry
Abstract: Detection of Stratospheric Air Intrusion Events From Ground-based High-resolution 10Be / 7Be by Accelerator Mass Spectrometry
Xu-Ke Liu, Yun-Chong Fu, Li Zhang, George S. Burr, Yan-Ting Bi, and Guo-Qing Zhao
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-282,2022
Preprint under review for ACP (discussion: open, 0 comments)
Based on the high-precision analysis of the accelerator mass spectrometer, the stratospheric air intrusion process of different intensities throughout the year was recorded for the first time with the daily resolution beryllium-10 / beryllium-7 ratio. The local weak stratospheric intrusion events in the Chinese Loess Plateau were directly detected on the ground, and it was found that these processes has a significant contribution to surface ozone.
PubDate: 2022-05-18T22:39:58+02:00
- Measurement Report: A new coupled method of pH titration and
size-resolved analysis to identify the structure, aging, and source of
water-soluble organic carbon
Abstract: Measurement Report: A new coupled method of pH titration and size-resolved analysis to identify the structure, aging, and source of water-soluble organic carbon
Yuanyuan Qin, Juanjuan Qin, Xiaobo Wang, Kang Xiao, Ting Qi, Yuwei Gao, Xueming Zhou, Shaoxuan Shi, Jingnan Li, Jingsi Gao, Ziyin Zhang, Jihua Tan, Yang Zhang, and Rongzhi Chen
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-321,2022
Preprint under review for ACP (discussion: open, 0 comments)
Deep interrogation of water-soluble organic carbon (WSOC) in aerosols is critical and challenging because WSOC is involved in many key particle-associated chemical reactions. This work examined how the chemical structure (distribution of functional groups) and optical properties (UV/fluorescence properties) of WSOC were affected by pH and particle size. We found that the pH-dependent and particle size-dependent behaviors could effectively reveal the structure, aging, and source of aerosol WSOC.
PubDate: 2022-05-18T22:39:58+02:00
- Long-Term Monitoring of Cloud Water Chemistry at Whiteface Mountain: The
Emergence of a New Chemical Regime
Abstract: Long-Term Monitoring of Cloud Water Chemistry at Whiteface Mountain: The Emergence of a New Chemical Regime
Christopher E. Lawrence, Paul Casson, Richard Brandt, James J. Schwab, James E. Dukett, Phil Snyder, Elizabeth Yerger, Daniel Kelting, Trevor C. VandenBoer, and Sara Lance
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-313,2022
Preprint under review for ACP (discussion: open, 0 comments)
Atmospheric aqueous chemistry can have profound effects on our environment, as illustrated by historical data from Whiteface Mountain (WFM) that was critical for uncovering the process of acid rain. The current study updates the long-term trends in cloud water composition at WFM for the past 28 years (1994–2021). We highlight the emergence of a new chemical regime dominated by organics and ammonium, quite different from the highly acidic regime observed in the past, but not necessarily “clean”.
PubDate: 2022-05-18T22:39:58+02:00
- Measurement report: On the contribution of long-distance transport to the
secondary aerosol formation and aging
Abstract: Measurement report: On the contribution of long-distance transport to the secondary aerosol formation and aging
Haobin Zhong, Ru-Jin Huang, Chunshui Lin, Wei Xu, Jing Duan, Yifang Gu, Wei Huang, Haiyan Ni, Chongshu Zhu, Yan You, Yunfei Wu, Renjian Zhang, Jurgita Ovadnevaite, Darius Ceburnis, and Colin D. O'Dowd
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-270,2022
Preprint under review for ACP (discussion: open, 0 comments)
To investigate the physio-chemical properties of aerosol transported from major pollution regions in China, observations were conducted ~200 m above the ground at the junction location of the two key pollution areas. We found that the formation efficiency, oxidation state and production rate of secondary aerosol were different in the transport sectors from different pollution regions, and they were largely enhanced by the regional long-distance transport.
PubDate: 2022-05-18T22:39:58+02:00
- Evaluation of Isoprene Nitrate Chemistry in Detailed Chemical Mechanisms
Abstract: Evaluation of Isoprene Nitrate Chemistry in Detailed Chemical Mechanisms
Alfred W. Mayhew, Ben H. Lee, Joel A. Thornton, Thomas J. Bannan, James Brean, James R. Hopkins, James D. Lee, Beth S. Nelson, Carl Percival, Andrew R. Rickard, Marvin D. Shaw, Peter M. Edwards, and Jaqueline F. Hamilton
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-333,2022
Preprint under review for ACP (discussion: open, 0 comments)
Isoprene nitrates are chemical species commonly found in the atmosphere that are important for their impacts on air quality and climate. This paper compares 3 different representations of the chemistry of isoprene nitrates in computational models. We highlight that while all of the models generally represented isoprene nitrates well, there were cases where the choice of chemistry included in the models has significant impacts on the concentration and composition of the modelled nitrates.
PubDate: 2022-05-18T22:39:58+02:00
- Using atmospheric trace gas vertical profiles to evaluate model fluxes: a
case study of Arctic-CAP observations and GEOS simulations for the ABoVE
domain
Abstract: Using atmospheric trace gas vertical profiles to evaluate model fluxes: a case study of Arctic-CAP observations and GEOS simulations for the ABoVE domain
Colm Sweeney, Abhishek Chatterjee, Sonja Wolter, Kathryn McKain, Robert Bogue, Stephen Conley, Tim Newberger, Lei Hu, Lesley Ott, Benjamin Poulter, Luke Schiferl, Brad Weir, Zhen Zhang, and Charles E. Miller
Atmos. Chem. Phys., 22, 6347–6364, https://doi.org/10.5194/acp-22-6347-2022, 2022
The Arctic Carbon Atmospheric Profiles (Arctic-CAP) project demonstrates the utility of aircraft profiles for independent evaluation of model-derived emissions and uptake of atmospheric CO2, CH4, and CO from land and ocean. Comparison with the Goddard Earth Observing System (GEOS) modeling system suggests that fluxes of CO2 are very consistent with observations, while those of CH4 have some regional and seasonal biases, and that CO comparison is complicated by transport errors.
PubDate: 2022-05-17T22:39:58+02:00
- An evaluation of new particle formation events in Helsinki during a Baltic
Sea cyanobacterial summer bloom
Abstract: An evaluation of new particle formation events in Helsinki during a Baltic Sea cyanobacterial summer bloom
Roseline C. Thakur, Lubna Dada, Lisa J. Beck, Lauriane L. J. Quéléver, Tommy Chan, Marjan Marbouti, Xu-Cheng He, Carlton Xavier, Juha Sulo, Janne Lampilahti, Markus Lampimäki, Yee Jun Tham, Nina Sarnela, Katrianne Lehtipalo, Alf Norkko, Markku Kulmala, Mikko Sipilä, and Tuija Jokinen
Atmos. Chem. Phys., 22, 6365–6391, https://doi.org/10.5194/acp-22-6365-2022, 2022
Every year intense cyanobacterial and macroalgal blooms occur in the Baltic Sea and in the coastal areas surrounding Helsinki, yet no studies have addressed the impact of biogenic emissions from these blooms on gas vapor concentrations, which in turn could influence new particle formation. This is the first study of its kind to address the chemistry driving new particle formation (NPF) during a bloom period in this region, highlighting the role of biogenic sulfuric acid and iodic acid.
PubDate: 2022-05-17T22:39:58+02:00
- Oceanic emissions of dimethyl sulfide and methanethiol and their
contribution to sulfur dioxide production in the marine atmosphere
Abstract: Oceanic emissions of dimethyl sulfide and methanethiol and their contribution to sulfur dioxide production in the marine atmosphere
Gordon A. Novak, Delaney B. Kilgour, Christopher M. Jernigan, Michael P. Vermeuel, and Timothy H. Bertram
Atmos. Chem. Phys., 22, 6309–6325, https://doi.org/10.5194/acp-22-6309-2022, 2022
We describe field measurements of the mixing ratio and oceanic emission flux of dimethyl sulfide (DMS) and methanethiol (MeSH) from a coastal ocean site. DMS is known to impact aerosol formation and growth in the marine atmosphere, influencing cloud formation and climate. Measurements of MeSH, which is produced by the same oceanic source as DMS, are rare. We show that MeSH emissions are large and must be measured alongside DMS to understand marine sulfur chemistry and aerosol formation.
PubDate: 2022-05-17T22:39:58+02:00
- An investigation into the chemistry of HONO in the marine boundary layer
at Tudor Hill Marine Atmospheric Observatory in Bermuda
Abstract: An investigation into the chemistry of HONO in the marine boundary layer at Tudor Hill Marine Atmospheric Observatory in Bermuda
Yuting Zhu, Youfeng Wang, Xianliang Zhou, Yasin F. Elshorbany, Chunxiang Ye, Matthew Hayden, and Andrew J. Peters
Atmos. Chem. Phys., 22, 6327–6346, https://doi.org/10.5194/acp-22-6327-2022, 2022
The daytime chemistry of nitrous acid (HONO), which plays an important role in the oxidation capacity of the troposphere, is not well understood. In this work, we report new field measurement results of HONO and the relevant parameters in the marine boundary layer at Tudor Hill Marine Atmospheric Observatory in Bermuda. We evaluate the daytime HONO budgets in air masses under different types of interaction with the island and examine the strengths of different HONO formation and loss mechanisms.
PubDate: 2022-05-17T22:39:58+02:00
- Arctic tropospheric ozone: assessment of current knowledge and model
performance
Abstract: Arctic tropospheric ozone: assessment of current knowledge and model performance
Cynthia H. Whaley, Kathy S. Law, Jens Liengaard Hjorth, Henrik Skov, Stephen R. Arnold, Joakim Langner, Jakob Boyd Pernov, Rong-You Chien, Jesper H. Christensen, Makoto Deushi, Xinyi Dong, Gregory Faluvegi, Mark Flanner, Joshua S. Fu, Michael Gauss, Ulas Im, Louis Marelle, Tatsuo Onishi, Naga Oshima, David A. Plummer, Luca Pozzoli, Jean-Christophe Raut, Ragnhild Skeie, Manu A. Thomas, Kostas Tsigaridis, Svetlana Tsyro, Steven T. Turnock, Knut von Salzen, and David W. Tarasick
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-319,2022
Preprint under review for ACP (discussion: open, 0 comments)
This study summarizes recent research on ozone in the Arctic, a sensitive and rapidly warming region. We find that the seasonal cycles of near-surface atmospheric ozone is variable depending on whether near the coast or in-land. Several global model simulations were evaluated and we found that because models lack some of the ozone chemistry that is important for the coastal Arctic locations, they do not accurate simulate ozone there.
PubDate: 2022-05-17T22:39:58+02:00
- Seasonal characteristics of atmospheric formaldehyde (HCHO) in a coastal
city of southeast China: Formation mechanism and photochemical effects
Abstract: Seasonal characteristics of atmospheric formaldehyde (HCHO) in a coastal city of southeast China: Formation mechanism and photochemical effects
Taotao Liu, Yiling Lin, Jinsheng Chen, Gaojie Chen, Chen Yang, Lingling Xu, Mengren Li, Xiaolong Fan, Yanting Chen, Liqian Yin, Yuping Chen, Xiaoting Ji, Ziyi Lin, Fuwang Zhang, Hong Wang, and Youwei Hong
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-292,2022
Preprint under review for ACP (discussion: open, 0 comments)
Field observations and models analysis were carried out in a coastal city to study HCHO formation mechanism and its impacts on photochemistry. HCHO contributed to atmospheric oxidation by around 10 %, reflecting its significance in photochemistry. Disabling HCHO mechanism made net O3 production rates decrease by 31 %, which were dominated by the reductions of pathways relating to radical reactions, indicating the HCHO affected O3 mainly by controlling the efficiencies of radical propagation.
PubDate: 2022-05-17T22:39:58+02:00
- Four-dimensional Variational Assimilation for SO2 Emission and its
Application around the COVID-19 lockdown in the spring 2020 over China
Abstract: Four-dimensional Variational Assimilation for SO2 Emission and its Application around the COVID-19 lockdown in the spring 2020 over China
Yiwen Hu, Zengliang Zang, Xiaoyan Ma, Yi Li, Yanfei Liang, Wei You, Xiaobin Pan, and Zhijin Li
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-301,2022
Preprint under review for ACP (discussion: open, 0 comments)
This study developed a four-dimensional variational assimilation (4DVAR) system based on WRF-Chem to optimize SO2 emissions. The system was applied to investigate the changes in SO2 emission in China during the COVID-19 lockdown, with special focus on Central China, by assimilating surface hourly SO2 observations. The results showed that the 4DVAR system can effectively optimize the emissions to describe the actual change in SO2 emissions during special events and improve the forecast skill.
PubDate: 2022-05-17T22:39:58+02:00
- Understanding greenhouse gas (GHG) column concentrations in Munich using
WRF
Abstract: Understanding greenhouse gas (GHG) column concentrations in Munich using WRF
Xinxu Zhao, Jia Chen, Julia Marschall, Michal Gałkowski, Stephan Hachinger, Florian Dietrich, Ankit Shekhar, Johannes Gensheimer, Adrian Wenzel, and Christoph Gerbig
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-281,2022
Preprint under review for ACP (discussion: open, 0 comments)
We develop a modeling framework using the Weather Research and Forecasting (WRF) model at a high spatial resolution (up to 400 m) to simulate the atmospheric transport of GHGs and interpret the column observations. The output is validated against local weather stations and column measurements in August 2018. Our study concludes with a refined application of the differential column method aided by air-mass transport tracing with STILT, also applied for an exploratory measurement interpretation.
PubDate: 2022-05-17T22:39:58+02:00
- Trends in secondary inorganic aerosol pollution in China and its responses
to emission controls of precursors in wintertime
Abstract: Trends in secondary inorganic aerosol pollution in China and its responses to emission controls of precursors in wintertime
Fanlei Meng, Yibo Zhang, Jiahui Kang, Mathew R. Heal, Stefan Reis, Mengru Wang, Lei Liu, Kai Wang, Shaocai Yu, Pengfei Li, Jing Wei, Yong Hou, Ying Zhang, Xuejun Liu, Zhenling Cui, Wen Xu, and Fusuo Zhang
Atmos. Chem. Phys., 22, 6291–6308, https://doi.org/10.5194/acp-22-6291-2022, 2022
PM2.5 pollution is a pressing environmental issue threatening human health and food security globally. We combined a meta-analysis of nationwide measurements and air quality modeling to identify efficiency gains by striking a balance between controlling NH3 and acid gas emissions. Persistent secondary inorganic aerosol pollution in China is limited by acid gas emissions, while an additional control on NH3 emissions would become more important as reductions in SO2 and NOx emissions progress.
PubDate: 2022-05-16T22:39:58+02:00
- A process-oriented evaluation of CAMS reanalysis ozone during tropopause
folds over Europe for the period 2003–2018
Abstract: A process-oriented evaluation of CAMS reanalysis ozone during tropopause folds over Europe for the period 2003–2018
Dimitris Akritidis, Andrea Pozzer, Johannes Flemming, Antje Inness, Philippe Nédélec, and Prodromos Zanis
Atmos. Chem. Phys., 22, 6275–6289, https://doi.org/10.5194/acp-22-6275-2022, 2022
We perform a process-oriented evaluation of Copernicus Atmosphere Monitoring Service (CAMS) reanalysis (CAMSRA) O3 over Europe using WOUDC (World Ozone and Ultraviolet Radiation Data Centre) ozonesondes and IAGOS (In-service Aircraft for a Global Observing System) aircraft measurements. Chemical data assimilation assists CAMSRA to reproduce the observed O3 increases in the troposphere during the examined folding events, but it mostly results in O3 overestimation in the upper troposphere.
PubDate: 2022-05-16T22:39:58+02:00
- Interannual variability of winds in the Antarctic mesosphere and lower
thermosphere over Rothera (67° S, 68° W) in radar observations and
WACCM-X
Abstract: Interannual variability of winds in the Antarctic mesosphere and lower thermosphere over Rothera (67° S, 68° W) in radar observations and WACCM-X
Phoebe Noble, Neil Hindley, Corwin Wright, Chihoko Cullens, Scott England, Nicholas Pedatella, Nicholas Mitchell, and Tracy Moffat-Griffin
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-150,2022
Preprint under review for ACP (discussion: open, 0 comments)
We use long term radar data and the WACCM-X model to study the impact of dynamical phenomena, including the 11-year solar cycle, ENSO, QBO and SAM, on Antarctic mesospheric winds. We find that in summer, the zonal wind (both observationally and in the model) is strongly correlated with the solar cycle. We also see important differences in the results from the other processes. In addition we find important and large biases in the winter model zonal winds relative to the observations.
PubDate: 2022-05-16T22:39:58+02:00
- Mapping the dependence of BC radiative forcing on emission region and
season
Abstract: Mapping the dependence of BC radiative forcing on emission region and season
Petri Räisänen, Joonas Merikanto, Risto Makkonen, Mikko Savolahti, Alf Kirkevåg, Maria Sand, Øyvind Seland, and Antti-Ilari Partanen
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-288,2022
Preprint under review for ACP (discussion: open, 0 comments)
A climate model is used to evaluate how the radiative forcing (RF) associated with black carbon (BC) emissions depends on the latitude, longitude and seasonality of emissions. It is found that both the direct RF (BC absorption of solar radiation in air) and snow RF (BC absorption in snow/ice) depend strongly on the emission region and season. The results suggest that for a given mass of BC emitted, climatic impacts are likely to be largest for high-latitude emissions due to their large snow RF.
PubDate: 2022-05-16T22:39:58+02:00
- Ozone depletion events in the Arctic spring of 2019: A new modeling
approach to bromine emissions
Abstract: Ozone depletion events in the Arctic spring of 2019: A new modeling approach to bromine emissions
Maximilian Herrmann, Moritz Schöne, Christian Borger, Simon Warnach, Thomas Wagner, Ulrich Platt, and Eva Gutheil
Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2022-334,2022
Preprint under review for ACP (discussion: open, 0 comments)
Ozone depletion events (ODEs) are a common occurence in the boundary layer during Arctic spring. Ozone is depleted by bromine species in an auto-catalytic reaction cycle. Previous modeling studies assumed an infinite bromine source at the ground. An alternative emission scheme is presented in which a finite amount of bromide in the snow is tracked over time. The Weather Research and Forecasting model coupled with Chemistry (WRF-Chem) is used to study ODEs in the Arctic from February to May 2019.
PubDate: 2022-05-16T22:39:58+02:00
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