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- Improved estimation of volcanic SO2 injections from satellite retrievals
and Lagrangian transport simulations: the 2019 Raikoke eruption
Abstract: Improved estimation of volcanic SO2 injections from satellite retrievals and Lagrangian transport simulations: the 2019 Raikoke eruption
Zhongyin Cai, Sabine Griessbach, and Lars Hoffmann
Atmos. Chem. Phys., 22, 6787–6809, https://doi.org/10.5194/acp-22-6787-2022, 2022
Using AIRS and TROPOMI sulfur dioxide retrievals and the Lagrangian transport model MPTRAC, we present an improved reconstruction of injection parameters of the 2019 Raikoke eruption. Reconstructions agree well between using AIRS nighttime and TROPOMI daytime retrievals, showing the potential of our approach to create a long-term volcanic sulfur dioxide inventory from nearly 20 years of AIRS retrievals.
PubDate: Wed, 25 May 2022 05:24:43 +020
DOI: 10.5194/acp-22-6787-2022 2022
- The 2019 methane budget and uncertainties at 1° resolution and each
country through Bayesian integration Of GOSAT total column methane data
and a priori inventory estimates
Abstract: The 2019 methane budget and uncertainties at 1° resolution and each country through Bayesian integration Of GOSAT total column methane data and a priori inventory estimates
John R. Worden, Daniel H. Cusworth, Zhen Qu, Yi Yin, Yuzhong Zhang, A. Anthony Bloom, Shuang Ma, Brendan K. Byrne, Tia Scarpelli, Joannes D. Maasakkers, David Crisp, Riley Duren, and Daniel J. Jacob
Atmos. Chem. Phys., 22, 6811–6841, https://doi.org/10.5194/acp-22-6811-2022, 2022
This paper is intended to accomplish two goals: 1) describe a new algorithm by which remotely sensed measurements of methane or other tracers can be used to not just quantify methane fluxes, but also attribute these fluxes to specific sources and regions and characterize their uncertainties, and 2) use this new algorithm to provide methane emissions by sector and country in support of the global stock take.
PubDate: Wed, 25 May 2022 05:24:43 +020
DOI: 10.5194/acp-22-6811-2022 2022
- Global total ozone recovery trends attributed to ozone-depleting substance
(ODS) changes derived from five merged ozone datasets
Abstract: Global total ozone recovery trends attributed to ozone-depleting substance (ODS) changes derived from five merged ozone datasets
Mark Weber, Carlo Arosio, Melanie Coldewey-Egbers, Vitali E. Fioletov, Stacey M. Frith, Jeannette D. Wild, Kleareti Tourpali, John P. Burrows, and Diego Loyola
Atmos. Chem. Phys., 22, 6843–6859, https://doi.org/10.5194/acp-22-6843-2022, 2022
Long-term trends in column ozone have been determined from five merged total ozone datasets spanning the period 1978–2020. We show that ozone recovery due to the decline in stratospheric halogens after the 1990s (as regulated by the Montreal Protocol) is evident outside the tropical region and amounts to half a percent per decade. The ozone recovery in the Northern Hemisphere is however compensated for by the negative long-term trend contribution from atmospheric dynamics since the year 2000.
PubDate: Wed, 25 May 2022 05:24:43 +020
DOI: 10.5194/acp-22-6843-2022 2022
- Global, regional and seasonal analysis of total ozone trends derived from
the 1995–2020 GTO-ECV climate data record
Abstract: Global, regional and seasonal analysis of total ozone trends derived from the 1995–2020 GTO-ECV climate data record
Melanie Coldewey-Egbers, Diego G. Loyola, Christophe Lerot, and Michel Van Roozendael
Atmos. Chem. Phys., 22, 6861–6878, https://doi.org/10.5194/acp-22-6861-2022, 2022
Monitoring the long-term evolution of ozone and the evaluation of trends is essential to assess the efficacy of the Montreal Protocol and its amendments. The first signs of recovery as a consequence of decreasing amounts of ozone-depleting substances have been reported, but the impact needs to be investigated in more detail. In the Southern Hemisphere significant positive trends were found, but in the Northern Hemisphere the expected increase is still not yet visible.
PubDate: Wed, 25 May 2022 05:24:43 +020
DOI: 10.5194/acp-22-6861-2022 2022
- A comprehensive study on hygroscopic behaviour and nitrate depletion of
NaNO3 and dicarboxylic acid mixtures: Implication for the influence
factors of nitrate depletion
Abstract: A comprehensive study on hygroscopic behaviour and nitrate depletion of NaNO3 and dicarboxylic acid mixtures: Implication for the influence factors of nitrate depletion
Shuaishuai Ma, Qiong Li, and Yunhong Zhang
Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2022-328,2022
Preprint under review for ACP (discussion: open, 0 comments)
The nitrate phase state can play a critical role in determining the occurrence and extent of nitrate depletion in internally mixed NaNO3/DCAs particles, which may be instructive for relevant aerosol reaction systems. Besides, organic acids have a potential to deplete nitrate based on the comprehensive consideration of acidity, particle-phase state, droplet water activity, as well as HNO3 gas phase diffusion.
PubDate: Wed, 25 May 2022 05:24:43 +020
DOI: 10.5194/acp-2022-3282022
- DLM estimates of long-term Ozone trends from Dobson and Brewer Umkehr
profiles
Abstract: DLM estimates of long-term Ozone trends from Dobson and Brewer Umkehr profiles
Eliane Maillard Barras, Alexander Haefele, René Stübi, Achille Jouberton, Herbert Schill, Irina Petropavlovskikh, Koji Miyagawa, Martin Stanek, and Lucien Froidevaux
Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2022-344,2022
Preprint under review for ACP (discussion: open, 0 comments)
Continuous intercomparisons of the two ground-based triads (3 Dobson and 3 Brewer spectrophotometers) from Arosa/Davos, Switzerland, are used for anomalies detection and homogenization of the longest continuous Umkehr measurement time series world-wide. Dynamic Linear Modeling (DLM) reveals a significant positive trend after 2004 in the upper stratosphere and a persistent negative trend in the middle and the lower stratosphere with different levels of significance depending on the dataset.
PubDate: Wed, 25 May 2022 05:24:43 +020
DOI: 10.5194/acp-2022-3442022
- Measurement report: Atmospheric mercury in a coastal city of Southeast
China: inter-annual variations and influencing factors
Abstract: Measurement report: Atmospheric mercury in a coastal city of Southeast China: inter-annual variations and influencing factors
Jiayan Shi, Yuping Chen, Lingling Xu, Youwei Hong, Mengren Li, Xiaolong Fan, Liqian Yin, Yanting Chen, Chen Yang, Gaojie Chen, Taotao Liu, Xiaoting Ji, and Jinsheng Chen
Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2022-367,2022
Preprint under review for ACP (discussion: open, 0 comments)
Gaseous elemental mercury (GEM) along with conventional air pollutants and meteorological parameters were simultaneously observed in Southeast China over the period 2012–2020. The observed GEM concentrations showed no distinct inter-annual trends. The interpretation rate of anthropogenic emissions decreased among years, but meteorological conditions was likely the more important factor driving the inter-annual trend of GEM in the study region.
PubDate: Wed, 25 May 2022 05:24:43 +020
DOI: 10.5194/acp-2022-3672022
- Exceptional middle latitude electron precipitation detected by balloon
observations: implications for atmospheric composition
Abstract: Exceptional middle latitude electron precipitation detected by balloon observations: implications for atmospheric composition
Irina Mironova, Miriam Sinnhuber, Galina Bazilevskaya, Mark Clilverd, Bernd Funke, Vladimir Makhmutov, Eugene Rozanov, Michelle L. Santee, Timofei Sukhodolov, and Thomas Ulich
Atmos. Chem. Phys., 22, 6703–6716, https://doi.org/10.5194/acp-22-6703-2022, 2022
From balloon measurements, we detected unprecedented, extremely powerful, electron precipitation over the middle latitudes. The robustness of this event is confirmed by satellite observations of electron fluxes and chemical composition, as well as by ground-based observations of the radio signal propagation. The applied chemistry–climate model shows the almost complete destruction of ozone in the mesosphere over the region where high-energy electrons were observed.
PubDate: Tue, 24 May 2022 05:24:43 +020
DOI: 10.5194/acp-22-6703-2022 2022
- Modeling impacts of ice-nucleating particles from marine aerosols on
mixed-phase orographic clouds during 2015 ACAPEX field campaign
Abstract: Modeling impacts of ice-nucleating particles from marine aerosols on mixed-phase orographic clouds during 2015 ACAPEX field campaign
Yun Lin, Jiwen Fan, Pengfei Li, Lai-yung Ruby Leung, Paul J. DeMott, Lexie Goldberger, Jennifer Comstock, Ying Liu, Jong-Hoon Jeong, and Jason Tomlinson
Atmos. Chem. Phys., 22, 6749–6771, https://doi.org/10.5194/acp-22-6749-2022, 2022
How sea spray aerosols may affect cloud and precipitation over the region by acting as ice-nucleating particles (INPs) is unknown. We explored the effects of INPs from marine aerosols on orographic cloud and precipitation for an atmospheric river event observed during the 2015 ACAPEX field campaign. The marine INPs enhance the formation of ice and snow, leading to less shallow warm clouds but more mixed-phase and deep clouds. This work suggests models need to consider the impacts of marine INPs.
PubDate: Tue, 24 May 2022 05:24:43 +020
DOI: 10.5194/acp-22-6749-2022 2022
- Time dependence of heterogeneous ice nucleation by ambient aerosols:
laboratory observations and a formulation for models
Abstract: Time dependence of heterogeneous ice nucleation by ambient aerosols: laboratory observations and a formulation for models
Jonas K. F. Jakobsson, Deepak B. Waman, Vaughan T. J. Phillips, and Thomas Bjerring Kristensen
Atmos. Chem. Phys., 22, 6717–6748, https://doi.org/10.5194/acp-22-6717-2022, 2022
Long-lived cold-layer clouds at subzero temperatures are observed to be remarkably persistent in their generation of ice particles and snow precipitation. There is uncertainty about why this is so. This motivates the present lab study to observe the long-term ice-nucleating ability of aerosol samples from the real troposphere. Time dependence of their ice nucleation is observed to be weak in lab experiments exposing the samples to isothermal conditions for up to about 10 h.
PubDate: Tue, 24 May 2022 05:24:43 +020
DOI: 10.5194/acp-22-6717-2022 2022
- Measurement report: Hygroscopic growth of ambient fine particles measured
at five sites in China
Abstract: Measurement report: Hygroscopic growth of ambient fine particles measured at five sites in China
Lu Chen, Fang Zhang, Dongmei Zhang, Xinming Wang, Wei Song, Jieyao Liu, Jingye Ren, Sihui Jiang, Xue Li, and Zhanqing Li
Atmos. Chem. Phys., 22, 6773–6786, https://doi.org/10.5194/acp-22-6773-2022, 2022
Aerosol hygroscopicity is critical when evaluating its effect on visibility and climate. Here, the size-resolved particle hygroscopicity at five sites in China is characterized using field measurements. We show the distinct behavior of hygroscopic particles during pollution evolution among the five sites. Moreover, different hygroscopic behavior during NPF events were also observed. The dataset is helpful for understanding the spatial variability in particle composition and formation mechanisms.
PubDate: Tue, 24 May 2022 05:24:43 +020
DOI: 10.5194/acp-22-6773-2022 2022
- Modeling Diurnal Variation of SOA Formation via Multiphase Reactions of
Biogenic Hydrocarbons
Abstract: Modeling Diurnal Variation of SOA Formation via Multiphase Reactions of Biogenic Hydrocarbons
Sanghee Han and Myoseon Jang
Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2022-327,2022
Preprint under review for ACP (discussion: open, 0 comments)
The diurnal pattern in biogenic SOA formation is simulated by using the UNIPAR model, which predicts SOA growth via multiphase reactions of hydrocarbons under varying NOx levels, aerosol acidity, humidity, and temperature. The simulation suggests that nighttime SOA formation, even in the urban environments where anthropogenic emission is high, is dominated by products from ozonolysis and NO3-initiated oxidation of biogenic hydrocarbons.
PubDate: Tue, 24 May 2022 05:24:43 +020
DOI: 10.5194/acp-2022-3272022
- African Smoke Particles Act as Cloud Condensation Nuclei in the Wintertime
Tropical North Atlantic Boundary Layer over Barbados
Abstract: African Smoke Particles Act as Cloud Condensation Nuclei in the Wintertime Tropical North Atlantic Boundary Layer over Barbados
Haley M. Royer, Mira L. Pöhlker, Ovid Krüger, Edmund Blades, Peter Sealy, Nurun Nahar Lata, Zezhen Cheng, Swarup China, Andrew P. Ault, Patricia K. Quinn, Paquita Zuidema, Christopher Pöhlker, Ulrich Pöschl, and Cassandra Gaston
Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2022-341,2022
Preprint under review for ACP (discussion: open, 0 comments)
This paper presents atmospheric particle chemical composition and measurements of aerosol water uptake properties collected at Ragged Point, Barbados during the winter of 2020. The result of this study indicates the importance of small African smoke particles on cloud droplet formation in the tropical North Atlantic and highlights the large spatial and temporal pervasiveness of smoke over the Atlantic Ocean.
PubDate: Tue, 24 May 2022 05:24:43 +020
DOI: 10.5194/acp-2022-3412022
- Impact of a subtropical high and a typhoon on a severe ozone pollution
episode in the Pearl River Delta, China
Abstract: Impact of a subtropical high and a typhoon on a severe ozone pollution episode in the Pearl River Delta, China
Shanshan Ouyang, Tao Deng, Run Liu, Jingyang Chen, Guowen He, Jeremy Cheuk-Hin Leung, Nan Wang, and Shaw Chen Liu
Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2022-290,2022
Preprint under review for ACP (discussion: open, 0 comments)
A record-breaking severe O3 pollution episode occurred under the influence of a Pacific subtropical high followed by Typhoon Mina in the Pearl River Delta (PRD) in early Autumn 2019. Through the WRF-CMAQ model simulations, we propose that the enhanced photochemical production of O3 during the episode is a major cause of the most severe O3 pollution year since the official O3 observation started in PRD in 2006.
PubDate: Tue, 24 May 2022 05:24:43 +020
DOI: 10.5194/acp-2022-2902022
- Atmospheric gas-phase composition over the Indian Ocean
Abstract: Atmospheric gas-phase composition over the Indian Ocean
Susann Tegtmeier, Christa Marandino, Yue Jia, Birgit Quack, and Anoop S. Mahajan
Atmos. Chem. Phys., 22, 6625–6676, https://doi.org/10.5194/acp-22-6625-2022, 2022
In the atmosphere over the Indian Ocean, intense anthropogenic pollution from Southeast Asia mixes with pristine oceanic air. During the winter monsoon, high pollution levels are regularly observed over the entire northern Indian Ocean, while during the summer monsoon, clean air dominates. Here, we review current progress in detecting and understanding atmospheric gas-phase composition over the Indian Ocean and its impacts on the upper atmosphere, oceanic biogeochemistry, and marine ecosystems.
PubDate: Mon, 23 May 2022 09:20:55 +020
DOI: 10.5194/acp-22-6625-2022 2022
- A global view on stratospheric ice clouds: assessment of processes related
to their occurrence based on satellite observations
Abstract: A global view on stratospheric ice clouds: assessment of processes related to their occurrence based on satellite observations
Ling Zou, Sabine Griessbach, Lars Hoffmann, and Reinhold Spang
Atmos. Chem. Phys., 22, 6677–6702, https://doi.org/10.5194/acp-22-6677-2022, 2022
Ice clouds in the stratosphere (SICs) greatly affect the water vapor balance and radiation budget in the upper troposphere and lower stratosphere (UTLS). We quantified the global SICs and analyzed their relationships with tropopause temperature, double tropopauses, UTLS clouds, gravity waves, and stratospheric aerosols. The correlations between SICs and all abovementioned processes indicate that the occurrence of and variability in SICs are spatiotemporally dependent on different processes.
PubDate: Mon, 23 May 2022 05:24:43 +020
DOI: 10.5194/acp-22-6677-2022 2022
- Age spectra and other transport diagnostics in the North American monsoon
UTLS from SEAC4RS in situ trace gas measurements
Abstract: Age spectra and other transport diagnostics in the North American monsoon UTLS from SEAC4RS in situ trace gas measurements
Eric A. Ray, Elliot L. Atlas, Sue Schauffler, Sofia Chelpon, Laura Pan, Harald Bönisch, and Karen H. Rosenlof
Atmos. Chem. Phys., 22, 6539–6558, https://doi.org/10.5194/acp-22-6539-2022, 2022
The movement of air masses and the trace gases they contain from the Earth’s surface into the upper troposphere and lower stratosphere (UTLS) can have important implications for the radiative and chemical balance of the atmosphere. In this study we build on recent techniques and use new ones to estimate a range of transport diagnostics based on simultaneously measured trace gases in the UTLS during the monsoon season in North America.
PubDate: Fri, 20 May 2022 09:40:44 +020
DOI: 10.5194/acp-22-6539-2022 2022
- Joint occurrence of heatwaves and ozone pollution and increased health
risks in Beijing, China: role of synoptic weather pattern and urbanization
Abstract: Joint occurrence of heatwaves and ozone pollution and increased health risks in Beijing, China: role of synoptic weather pattern and urbanization
Lian Zong, Yuanjian Yang, Haiyun Xia, Meng Gao, Zhaobin Sun, Zuofang Zheng, Xianxiang Li, Guicai Ning, Yubin Li, and Simone Lolli
Atmos. Chem. Phys., 22, 6523–6538, https://doi.org/10.5194/acp-22-6523-2022, 2022
Heatwaves (HWs) paired with higher ozone (O3) concentration at surface level pose a serious threat to human health. Taking Beijing as an example, three unfavorable synoptic weather patterns were identified to dominate the compound HW and O3 pollution events. Under the synergistic stress of HWs and O3 pollution, public mortality risk increased, and synoptic patterns and urbanization enhanced the compound risk of events in Beijing by 33.09 % and 18.95 %, respectively.
PubDate: Fri, 20 May 2022 09:40:44 +020
DOI: 10.5194/acp-22-6523-2022 2022
- An ensemble-variational inversion system for the estimation of ammonia
emissions using CrIS satellite ammonia retrievals
Abstract: An ensemble-variational inversion system for the estimation of ammonia emissions using CrIS satellite ammonia retrievals
Michael Sitwell, Mark W. Shephard, Yves Rochon, Karen Cady-Pereira, and Enrico Dammers
Atmos. Chem. Phys., 22, 6595–6624, https://doi.org/10.5194/acp-22-6595-2022, 2022
Observations of ammonia made using the satellite-borne CrIS instrument were used to improve the ammonia emissions used in the GEM-MACH model. These observations were used to refine estimates of the monthly mean ammonia emissions over North America for May to August 2016. The updated ammonia emissions reduced biases of GEM-MACH surface ammonia fields with surface observations and showed some improvements in the forecasting of species involved in inorganic particulate matter formation.
PubDate: Fri, 20 May 2022 09:20:55 +020
DOI: 10.5194/acp-22-6595-2022 2022
- Energy and mass exchange at an urban site in mountainous terrain – the
Alpine city of Innsbruck
Abstract: Energy and mass exchange at an urban site in mountainous terrain – the Alpine city of Innsbruck
Helen Claire Ward, Mathias Walter Rotach, Alexander Gohm, Martin Graus, Thomas Karl, Maren Haid, Lukas Umek, and Thomas Muschinski
Atmos. Chem. Phys., 22, 6559–6593, https://doi.org/10.5194/acp-22-6559-2022, 2022
This study examines how cities and their surroundings influence turbulent exchange processes responsible for weather and climate. Analysis of a 4-year observational dataset for the Alpine city of Innsbruck reveals several similarities with other (flat) city centre sites. However, the mountain setting leads to characteristic daily and seasonal flow patterns (valley winds) and downslope windstorms that have a marked effect on temperature, wind speed, turbulence and pollutant concentration.
PubDate: Fri, 20 May 2022 09:20:55 +020
DOI: 10.5194/acp-22-6559-2022 2022
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