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  Subjects -> METEOROLOGY (Total: 106 journals)
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Atmospheric Chemistry and Physics Discussions (ACPD)
Number of Followers: 14  

  This is an Open Access Journal Open Access journal
ISSN (Print) 1680-7367 - ISSN (Online) 1680-7375
Published by Copernicus Publications Homepage  [54 journals]
  • Exploring the inorganic composition of the Asian Tropopause Aerosol Layer
           using medium-duration balloon flights

    • Abstract: Exploring the inorganic composition of the Asian Tropopause Aerosol Layer using medium-duration balloon flights
      Hazel Vernier, Neeraj Rastogi, Hongyu Liu, Amit Kumar Pandit, Kris Bedka, Anil Patel, Madineni Venkat Ratnam, Buduru Suneel Kumar, Bo Zhang, Harish Gadhavi, Frank Wienhold, Gwenael Berthet, and Jean-Paul Vernier
      Atmos. Chem. Phys., 22, 12675–12694, https://doi.org/10.5194/acp-22-12675-2022, 2022
      The chemical composition of the stratospheric aerosols collected aboard high-altitude balloons above the summer Asian monsoon reveals the presence of nitrate/nitrite. Using numerical simulations and satellite observations, we found that pollution as well as lightning could explain some of our observations.
      PubDate: Thu, 29 Sep 2022 10:40:50 +020
      DOI: 10.5194/acp-22-12675-2022 2022

       
  • Technical note: Use of PM2.5 to CO ratio as an indicator of wildfire smoke
           in urban areas

    • Abstract: Technical note: Use of PM2.5 to CO ratio as an indicator of wildfire smoke in urban areas
      Daniel A. Jaffe, Brendan Schnieder, and Daniel Inouye
      Atmos. Chem. Phys., 22, 12695–12704, https://doi.org/10.5194/acp-22-12695-2022, 2022
      In this paper we use commonly measured pollutants (PM2.5 and carbon monoxide) to develop a Monte Carlo simulation of the mixing of urban pollution with smoke. The simulations compare well with observations from a heavily impacted smoke site and show that we can use standard regulatory measurements to quantify the amount of smoke in urban areas.
      PubDate: Thu, 29 Sep 2022 10:40:50 +020
      DOI: 10.5194/acp-22-12695-2022 2022

       
  • Long-range transported continental aerosol in the Eastern North Atlantic:
           three multiday event regimes influence cloud condensation nuclei

    • Abstract: Long-range transported continental aerosol in the Eastern North Atlantic: three multiday event regimes influence cloud condensation nuclei
      Francesca Gallo, Janek Uin, Kevin J. Sanchez, Richard H. Moore, Jian Wang, Robert Wood, Fan Mei, Connor Flynn, Stephen Springston, Eduardo B. Azevedo, Chongai Kuang, and Allison C. Aiken
      Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2022-637,2022
      Preprint under review for ACP (discussion: open, 0 comments)
      This study provides a summary statistic of multiday aerosol plume transport events influences on aerosol physical properties and cloud condensation nuclei budget at the U.S. Department of Energy Atmospheric Radiation Measurement Facility in the Eastern North Atlantic (ENA). An algorithm that integrates aerosol properties is developed and applied to identify multiday aerosol transport events. The influence of the aerosol plumes on aerosol populations at ENA is successively assessed.
      PubDate: Thu, 29 Sep 2022 10:40:50 +020
      DOI: 10.5194/acp-2022-6372022

       
  • Evaluation of tropical water vapour from CMIP6 global climate models using
           the ESA CCI Water Vapour climate data records

    • Abstract: Evaluation of tropical water vapour from CMIP6 global climate models using the ESA CCI Water Vapour climate data records
      Jia He, Helene Brogniez, and Laurence Picon
      Atmos. Chem. Phys., 22, 12591–12606, https://doi.org/10.5194/acp-22-12591-2022, 2022
      A 2003–2017 satellite-based atmospheric water vapour climate data record is used to assess climate models and reanalyses. The focus is on the tropical belt, whose regional variations in the hydrological cycle are related to the tropospheric overturning circulation. While there are similarities in the interannual variability, the major discrepancies can be explained by the presence of clouds, the representation of moisture fluxes at the surface and cloud processes in the models.
      PubDate: Wed, 28 Sep 2022 10:40:50 +020
      DOI: 10.5194/acp-22-12591-2022 2022

       
  • Ice-nucleating particles near two major dust source regions

    • Abstract: Ice-nucleating particles near two major dust source regions
      Charlotte M. Beall, Thomas C. J. Hill, Paul J. DeMott, Tobias Köneman, Michael Pikridas, Frank Drewnick, Hartwig Harder, Christopher Pöhlker, Jos Lelieveld, Bettina Weber, Minas Iakovides, Roman Prokeš, Jean Sciare, Meinrat O. Andreae, M. Dale Stokes, and Kimberly A. Prather
      Atmos. Chem. Phys., 22, 12607–12627, https://doi.org/10.5194/acp-22-12607-2022, 2022
      Ice-nucleating particles (INPs) are rare aerosols that can trigger ice formation in clouds and affect climate-relevant cloud properties such as phase, reflectivity and lifetime. Dust is the dominant INP source, yet few measurements have been reported near major dust sources. We report INP observations within hundreds of kilometers of the biggest dust source regions globally: the Sahara and the Arabian Peninsula. Results show that at temperatures> −15 °C, INPs are dominated by organics.
      PubDate: Wed, 28 Sep 2022 10:40:50 +020
      DOI: 10.5194/acp-22-12607-2022 2022

       
  • Impact of urbanization on gas-phase pollutant concentrations: a
           regional-scale, model-based analysis of the contributing factors

    • Abstract: Impact of urbanization on gas-phase pollutant concentrations: a regional-scale, model-based analysis of the contributing factors
      Peter Huszar, Jan Karlický, Lukáš Bartík, Marina Liaskoni, Alvaro Patricio Prieto Perez, and Kateřina Šindelářová
      Atmos. Chem. Phys., 22, 12647–12674, https://doi.org/10.5194/acp-22-12647-2022, 2022
      Urbanization turns rural land cover into artificial land cover, while due to human activities, it introduces a great quantity of emissions. We attempt to quantify the impact of urbanization on the final air pollutant levels by looking not only at these emissions, but also the way urban land cover influences meteorological conditions, how the removal of pollutants changes due to urban land cover, and how biogenic emissions from vegetation change due to less vegetation in urban areas.
      PubDate: Wed, 28 Sep 2022 10:40:50 +020
      DOI: 10.5194/acp-22-12647-2022 2022

       
  • 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., 22, 12629–12646, https://doi.org/10.5194/acp-22-12629-2022, 2022
      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 the Yangtze River Delta (YRD). OH + NO2 contributes 60 %–83 % of the TNO3 production rates, and the N2O5 heterogeneous pathway contributes 10 %–36 %. The N2O5 heterogeneous pathway becomes more important in cold seasons. Local emissions and regional transportation contribute 50 %–62 % and 38 %–50 % to YRD NO3- concentrations, respectively.
      PubDate: Wed, 28 Sep 2022 10:40:50 +020
      DOI: 10.5194/acp-22-12629-2022 2022

       
  • Observed changes in stratospheric circulation: Decreasing lifetime of N2O,
           2005–2021

    • Abstract: Observed changes in stratospheric circulation: Decreasing lifetime of N2O, 2005–2021
      Michael J. Prather, Lucien Froidevaux, and Nathaniel J. Livesey
      Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2022-650,2022
      Preprint under review for ACP (discussion: open, 0 comments)
      From the satellite data for nitrous oxide (N2O), ozone, and temperature, we calculate the monthly loss of N2O, and find it is increasing faster than expected, resulting in a shorter lifetime, which reduces the impact of anthropogenic emissions. The cause of the increasing loss is enhanced vertical lofting of high-N2O air in the tropical middle stratosphere, where it is destroyed photochemically. This presents a new, distinct, but minor, negative climate-chemistry feedback.
      PubDate: Tue, 27 Sep 2022 10:40:50 +020
      DOI: 10.5194/acp-2022-6502022

       
  • Flaring efficiencies and NOx emission ratios measured for offshore oil and
           gas facilities in the North Sea

    • Abstract: Flaring efficiencies and NOx emission ratios measured for offshore oil and gas facilities in the North Sea
      Jacob T. Shaw, Amy Foulds, Shona Wilde, Patrick Barker, Freya Squires, James Lee, Ruth Purvis, Ralph Burton, Ioana Colfescu, Stephen Mobbs, Stéphane J.-B. Bauguitte, Stuart Young, Stefan Schwietzke, and Grant Allen
      Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2022-679,2022
      Preprint under review for ACP (discussion: open, 0 comments)
      Flaring is used by the oil and gas sector to dispose of unwanted natural gas. However, few studies have assessed the efficiency with which the gas is combusted. We sampled flaring emissions from offshore facilities in the North Sea. Average measured flaring efficiencies were ~98 % but with a skewed distribution including many flares of lower efficiency. NOx and ethane emissions were also measured. Inefficient flaring practices could be a target for mitigating carbon emissions.
      PubDate: Tue, 27 Sep 2022 10:40:50 +020
      DOI: 10.5194/acp-2022-6792022

       
  • Radical chemistry in the Pearl River Delta: observations and modeling of
           OH and HO2 radicals in Shenzhen in 2018

    • Abstract: Radical chemistry in the Pearl River Delta: observations and modeling of OH and HO2 radicals in Shenzhen in 2018
      Xinping Yang, Keding Lu, Xuefei Ma, Yue Gao, Zhaofeng Tan, Haichao Wang, Xiaorui Chen, Xin Li, Xiaofeng Huang, Lingyan He, Mengxue Tang, Bo Zhu, Shiyi Chen, Huabin Dong, Limin Zeng, and Yuanhang Zhang
      Atmos. Chem. Phys., 22, 12525–12542, https://doi.org/10.5194/acp-22-12525-2022, 2022
      We present the OH and HO2 radical observations at the Shenzhen site (Pearl River Delta, China) in the autumn of 2018. The diurnal maxima were 4.5 × 106 cm−3 for OH and 4.2 × 108 cm−3 for HO2 (including an estimated interference of 23 %–28 % from RO2 radicals during the daytime). The OH underestimation was identified again, and it was attributable to the missing OH sources. HO2 heterogeneous uptake, ROx sources and sinks, and the atmospheric oxidation capacity were evaluated as well.
      PubDate: Mon, 26 Sep 2022 11:00:21 +020
      DOI: 10.5194/acp-22-12525-2022 2022

       
  • Climate-driven deterioration of future ozone pollution in Asia predicted
           by machine learning with multisource data

    • Abstract: Climate-driven deterioration of future ozone pollution in Asia predicted by machine learning with multisource data
      Huimin Li, Yang Yang, Jianbing Jin, Hailong Wang, Ke Li, Pinya Wang, and Hong Liao
      Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2022-550,2022
      Preprint under review for ACP (discussion: open, 0 comments)
      Future climate change will aggravate ozone pollution in Asia, especially in high forcing scenarios. Ozone pollution in China will expand from North China to South China and extend into the cold season in a warmer future. The emphasis of this work is to quantify the impacts of future climate change on O3 pollution in Asia, which is of great significance for the future O3 pollution mitigation strategies.
      PubDate: Mon, 26 Sep 2022 11:00:21 +020
      DOI: 10.5194/acp-2022-5502022

       
  • Hemispheric-wide climate response to regional COVID-19-related aerosol
           emission reductions: the prominent role of atmospheric circulation
           adjustments

    • Abstract: Hemispheric-wide climate response to regional COVID-19-related aerosol emission reductions: the prominent role of atmospheric circulation adjustments
      Nora Lea Sophie Fahrenbach and Massimo Alberto Bollasina
      Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2022-558,2022
      Preprint under review for ACP (discussion: open, 0 comments)
      We studied the monthly-scale climate response to COVID-19 aerosol emission reductions during January–May 2020 using climate models. Our results show global temperature and rainfall anomalies driven by circulation changes. The climate patterns reverse polarity from JF to MAM due to a shift of the main SO2 reduction region from China to India. This real-life example of rapid climate adjustments to abrupt, regional aerosol emission reduction has large implications for future climate projections.
      PubDate: Mon, 26 Sep 2022 11:00:21 +020
      DOI: 10.5194/acp-2022-5582022

       
  • Signatures of gravity wave-induced instabilities in balloon lidar
           soundings of polar mesospheric clouds

    • Abstract: Signatures of gravity wave-induced instabilities in balloon lidar soundings of polar mesospheric clouds
      Natalie Kaifler, Bernd Kaifler, Markus Rapp, and David C. Fritts
      Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2022-572,2022
      Preprint under review for ACP (discussion: open, 0 comments)
      We used a lidar to measure polar mesospheric clouds from a balloon floating in the upper stratosphere. The thin-layered ice clouds at 83 km altitude are perturbed by waves. The high-resolution lidar soundings reveal small-scale structures induced by the breaking of those waves. We study these patterns and find that they occur very often. We show their morphology and discuss associated dynamical physical processes, which helps to interpret case studies as well as to guide modelling.
      PubDate: Mon, 26 Sep 2022 11:00:21 +020
      DOI: 10.5194/acp-2022-5722022

       
  • Measurement Report: Abundance and fractional solubilities of aerosol
           metals in urban Hong Kong: Insights into factors that control aerosol
           metal dissolution in an urban site in South China

    • Abstract: Measurement Report: Abundance and fractional solubilities of aerosol metals in urban Hong Kong: Insights into factors that control aerosol metal dissolution in an urban site in South China
      Junwei Yang, Lan Ma, Xiao He, Wing Chi Au, Yanhao Miao, Wen-Xiong Wang, and Theodora Nah
      Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2022-597,2022
      Preprint under review for ACP (discussion: open, 0 comments)
      Water-soluble metals play key roles in human health and atmospheric processes. We report the seasonal abundance and fractional solubilities of different metals in aerosols collected in urban Hong Kong, South China, and the key factors that modulated solubilities of various metals in fine aerosols. Our results highlight the dual roles (i.e., acidifying the aerosol particle and providing a liquid reaction medium) that sulfate plays in the acid dissolution of metals in fine aerosols in Hong Kong.
      PubDate: Mon, 26 Sep 2022 11:00:21 +020
      DOI: 10.5194/acp-2022-5972022

       
  • Foreign emissions exacerbate PM2.5 pollution in China through nitrate
           chemistry

    • Abstract: Foreign emissions exacerbate PM2.5 pollution in China through nitrate chemistry
      Jun-Wei Xu, Jintai Lin, Gan Luo, Jamiu Adeniran, and Hao Kong
      Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2022-646,2022
      Preprint under review for ACP (discussion: open, 0 comments)
      Research on the sources of Chinese PM2.5 pollution has focused on the contributions of China’s domestic emissions. However, the impact of foreign anthropogenic emissions has typically been simplified or neglected. Here we find that foreign anthropogenic emissions play an important role in Chinese PM2.5 pollution through chemical interactions between transported pollutants and China’s local emissions. Thus, foreign emission reductions are essential for improving Chinese air quality.
      PubDate: Mon, 26 Sep 2022 11:00:21 +020
      DOI: 10.5194/acp-2022-6462022

       
  • Multi-axis differential optical absorption spectroscopy (MAX-DOAS)
           observations of formaldehyde and nitrogen dioxide at three sites in Asia
           and comparison with the global chemistry transport model CHASER

    • Abstract: Multi-axis differential optical absorption spectroscopy (MAX-DOAS) observations of formaldehyde and nitrogen dioxide at three sites in Asia and comparison with the global chemistry transport model CHASER
      Hossain Mohammed Syedul Hoque, Kengo Sudo, Hitoshi Irie, Alessandro Damiani, Manish Naja, and Al Mashroor Fatmi
      Atmos. Chem. Phys., 22, 12559–12589, https://doi.org/10.5194/acp-22-12559-2022, 2022
      Nitrogen dioxide (NO2) and formaldehyde (HCHO) are essential trace graces regulating tropospheric ozone chemistry. These trace constituents are measured using an optical passive remote sensing technique. In addition, NO2 and HCHO are simulated with a computer model and evaluated against the observations. Such evaluations are essential to assess model uncertainties and improve their predictability. The results yielded good agreement between the two datasets with some discrepancies.
      PubDate: Mon, 26 Sep 2022 10:40:50 +020
      DOI: 10.5194/acp-22-12559-2022 2022

       
  • Correcting ozone biases in a global chemistry–climate model:
           implications for future ozone

    • Abstract: Correcting ozone biases in a global chemistry–climate model: implications for future ozone
      Zhenze Liu, Ruth M. Doherty, Oliver Wild, Fiona M. O'Connor, and Steven T. Turnock
      Atmos. Chem. Phys., 22, 12543–12557, https://doi.org/10.5194/acp-22-12543-2022, 2022
      Weaknesses in process representation in chemistry–climate models lead to biases in simulating surface ozone and to uncertainty in projections of future ozone change. We develop a deep learning model to demonstrate the feasibility of ozone bias correction and show its capability in providing improved assessments of the impacts of climate and emission changes on future air quality, along with valuable information to guide future model development.
      PubDate: Mon, 26 Sep 2022 10:40:50 +020
      DOI: 10.5194/acp-22-12543-2022 2022

       
  • Mobile MAX-DOAS observations of tropospheric NO2 and HCHO during summer
           over the Three Rivers’ Source region in China

    • Abstract: Mobile MAX-DOAS observations of tropospheric NO2 and HCHO during summer over the Three Rivers’ Source region in China
      Siyang Cheng, Xinghong Cheng, Jianzhong Ma, Xiangde Xu, Wenqian Zhang, Jinguang Lv, Gang Bai, Bing Chen, Siying Ma, Steffen Dörner, Sebastian Donner, and Thomas Wagner
      Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2022-629,2022
      Preprint under review for ACP (discussion: open, 0 comments)
      We made mobile MAX-DOAS measurements in the background atmosphere over the Tibetan Plateau in summer 2021. We retrieved the tropospheric NO2 and HCHO vertical column densities (VCDs) along extended driving routes, and found a decreasing trend of the VCDs with altitude. Elevated NO2 VCDs along the driving routes could be attributed to enhanced traffic emissions from the towns crossed. The spatio-temporal distribution of the HCHO VCDs correlated strongly with the surface temperature.
      PubDate: Mon, 26 Sep 2022 10:40:50 +020
      DOI: 10.5194/acp-2022-6292022

       
  • Reconciling the total carbon budget for boreal forest wildfire emissions
           using airborne observations

    • Abstract: Reconciling the total carbon budget for boreal forest wildfire emissions using airborne observations
      Katherine L. Hayden, Shao-Meng Li, John Liggio, Michael J. Wheeler, Jeremy J. B. Wentzell, Amy Leithead, Peter Brickell, Richard L. Mittermeier, Zachary Oldham, Cristian M. Mihele, Ralf M. Staebler, Samar G. Moussa, Andrea Darlington, Mengistu Wolde, Daniel Thompson, Jack Chen, Debora Griffin, Ellen Eckert, Jenna C. Ditto, Megan He, and Drew R. Gentner
      Atmos. Chem. Phys., 22, 12493–12523, https://doi.org/10.5194/acp-22-12493-2022, 2022
      In this study, airborne measurements provided the most detailed characterization, to date, of boreal forest wildfire emissions. Measurements showed a large diversity of air pollutants expanding the volatility range typically reported. A large portion of organic species was unidentified, likely comprised of complex organic compounds. Aircraft-derived emissions improve wildfire chemical speciation and can support reliable model predictions of pollution from boreal forest wildfires.
      PubDate: Fri, 23 Sep 2022 11:00:21 +020
      DOI: 10.5194/acp-22-12493-2022 2022

       
  • Highly supercooled riming and unusual triple-frequency radar signatures
           over McMurdo Station, Antarctica

    • Abstract: Highly supercooled riming and unusual triple-frequency radar signatures over McMurdo Station, Antarctica
      Frederic Tridon, Israel Silber, Alessandro Battaglia, Stefan Kneifel, Ann Fridlind, Petros Kalogeras, and Ranvir Dhillon
      Atmos. Chem. Phys., 22, 12467–12491, https://doi.org/10.5194/acp-22-12467-2022, 2022
      The role of ice precipitation in the Earth water budget is not well known because ice particles are complex, and their formation involves intricate processes. Riming of ice crystals by supercooled water droplets is an efficient process, but little is known about its importance at high latitudes. In this work, by exploiting the deployment of an unprecedented number of remote sensing systems in Antarctica, we find that riming occurs at much lower temperatures compared with the mid-latitudes.
      PubDate: Fri, 23 Sep 2022 10:22:08 +020
      DOI: 10.5194/acp-22-12467-2022 2022

       
 
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