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- Measurement report: Long-range transport patterns into the tropical
northwest Pacific during the CAMP2Ex aircraft campaign: chemical
composition, size distributions, and the impact of convection
Abstract: Measurement report: Long-range transport patterns into the tropical northwest Pacific during the CAMP2Ex aircraft campaign: chemical composition, size distributions, and the impact of convection
Miguel Ricardo A. Hilario, Ewan Crosbie, Michael Shook, Jeffrey S. Reid, Maria Obiminda L. Cambaliza, James Bernard B. Simpas, Luke Ziemba, Joshua P. DiGangi, Glenn S. Diskin, Phu Nguyen, F. Joseph Turk, Edward Winstead, Claire E. Robinson, Jian Wang, Jiaoshi Zhang, Yang Wang, Subin Yoon, James Flynn, Sergio L. Alvarez, Ali Behrangi, and Armin Sorooshian
Atmos. Chem. Phys., 21, 3777–3802, https://doi.org/10.5194/acp-21-3777-2021, 2021
This study characterizes long-range transport from major Asian pollution sources into the tropical northwest Pacific and the impact of scavenging on these air masses. We combined aircraft observations, HYSPLIT trajectories, reanalysis, and satellite retrievals to reveal distinct composition and size distribution profiles associated with specific emission sources and wet scavenging. The results of this work have implications for international policymaking related to climate and health.
PubDate: Mon, 15 Mar 2021 08:48:30 +010
DOI: 10.5194/acp-21-3777-2021 2021
- Long-term multi-source data analysis about the characteristics of aerosol
optical properties and types over Australia
Abstract: Long-term multi-source data analysis about the characteristics of aerosol optical properties and types over Australia
Xingchuan Yang, Chuanfeng Zhao, Yikun Yang, and Hao Fan
Atmos. Chem. Phys., 21, 3803–3825, https://doi.org/10.5194/acp-21-3803-2021, 2021
We investigate the spatiotemporal distributions of aerosol optical properties and major aerosol types, along with the vertical distribution of the major aerosol types over Australia based on multi-source data. The results of this study provide significant information on aerosol optical properties in Australia, which can help to understand their characteristics and potential climate impacts.
PubDate: Mon, 15 Mar 2021 08:48:30 +010
DOI: 10.5194/acp-21-3803-2021 2021
- Speciation of VOC emissions related to offshore North Sea oil and gas
production
Abstract: Speciation of VOC emissions related to offshore North Sea oil and gas production
Shona E. Wilde, Pamela A. Dominutti, Grant Allen, Stephen J. Andrews, Prudence Bateson, Stephane J.-B. Bauguitte, Ralph R. Burton, Ioana Colfescu, James France, James R. Hopkins, Langwen Huang, Anna E. Jones, Tom Lachlan-Cope, James D. Lee, Alastair C. Lewis, Stephen D. Mobbs, Alexandra Weiss, Stuart Young, and Ruth M. Purvis
Atmos. Chem. Phys., 21, 3741–3762, https://doi.org/10.5194/acp-21-3741-2021, 2021
We use airborne measurements to evaluate the speciation of volatile organic compound (VOC) emissions from offshore oil and gas (O&G) installations in the North Sea. The composition of emissions varied across regions associated with either gas, condensate or oil extraction, demonstrating that VOC emissions are not uniform across the whole O&G sector. We compare our results to VOC source profiles in the UK emissions inventory, showing these emissions are not currently fully characterized.
PubDate: Fri, 12 Mar 2021 08:48:30 +010
DOI: 10.5194/acp-21-3741-2021 2021
- Identification and source attribution of organic compounds in ultrafine
particles near Frankfurt International Airport
Abstract: Identification and source attribution of organic compounds in ultrafine particles near Frankfurt International Airport
Florian Ungeheuer, Dominik van Pinxteren, and Alexander L. Vogel
Atmos. Chem. Phys., 21, 3763–3775, https://doi.org/10.5194/acp-21-3763-2021, 2021
We analysed the chemical composition of ultrafine particles from 10–56 nm near Frankfurt Airport based on cascade impactor samples. We used an offline non-target screening to determine size-resolved molecular fingerprints. Unambiguous attribution of two homologous ester series to jet engine oils enables a new strategy of source attribution and explains the majority of the detected compounds. In addition, we identified additives of jet oils and a detrimental thermal transformation product.
PubDate: Fri, 12 Mar 2021 08:48:30 +010
DOI: 10.5194/acp-21-3763-2021 2021
- Modelling the influence of biotic plant stress on atmospheric aerosol
particle processes throughout a growing season
Abstract: Modelling the influence of biotic plant stress on atmospheric aerosol particle processes throughout a growing season
Ditte Taipale, Veli-Matti Kerminen, Mikael Ehn, Markku Kulmala, and Ülo Niinemets
Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2021-141,2021
Preprint under review for ACP (discussion: open, 0 comments)
Larval feeding and fungal infections of leaves can change the emission of volatile compounds from plants a lot and thereby influence aerosol processes in the air. We developed a model which considers the dynamics of larvae and fungi and the dependency of the emission on the severity of stress. We show that the infections can be highly atmospherically relevant during long periods of time and at times be more important to consider than the parameters which are currently used in emission models.
PubDate: Fri, 12 Mar 2021 08:48:30 +010
DOI: 10.5194/acp-2021-1412021
- Impact of wind pattern and complex topography on snow
microphysics during
ICE-POP 2018
Abstract: Impact of wind pattern and complex topography on snowmicrophysics during ICE-POP 2018
Kwonil Kim, Wonbae Bang, Eun-Chul Chang, Francisco J. Tapiador, Chia-Lun Tsai, Eunsil Jung, and Gyuwon Lee
Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2021-128,2021
Preprint under review for ACP (discussion: open, 0 comments)
This study analyzed the microphysical characteristics of snow in complex terrain and nearby ocean according to topography and wind pattern during the ICE-POP 2018. The observations from collocated vertically pointing radars and disdrometers indicate the riming in the mountainous region is likely caused by a strong shear and turbulence. The different behaviors of aggregation and riming were found by three different synoptic patterns (air-sea interaction, cold low, and warm low).
PubDate: Fri, 12 Mar 2021 08:48:30 +010
DOI: 10.5194/acp-2021-1282021
- Origins and characterization of CO and O3 in the African upper troposphere
Abstract: Origins and characterization of CO and O3 in the African upper troposphere
Victor Lannuque, Bastien Sauvage, Brice Barret, Hannah Clark, Gilles Athier, Damien Boulanger, Jean-Pierre Cammas, Jean-Marc Cousin, Alain Fontaine, Eric Le Flochmoën, Philippe Nédélec, Hervé Petetin, Isabelle Pfaffenzeller, Susanne Rohs, Herman G. J. Smit, Pawel Wolff, and Valérie Thouret
Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2021-115,2021
Preprint under review for ACP (discussion: open, 0 comments)
African intertropical troposphere is one of the world areas where the increase in ozone mixing ratio is most marked since 1980 and where high carbon monoxide mixing ratios are found in altitude. In this article, IAGOS aircraft measurements, IASI satellite instrument observations and SOFT-IO model products are used to explore the seasonal distribution variations and the origin of ozone and carbon monoxide over the African upper troposphere.
PubDate: Fri, 12 Mar 2021 08:48:30 +010
DOI: 10.5194/acp-2021-1152021
- Coupled and decoupled stratocumulus-topped boundary layers:
turbulence
properties
Abstract: Coupled and decoupled stratocumulus-topped boundary layers:turbulence properties
Jakub L. Nowak, Holger Siebert, Kai-Erik Szodry, and Szymon P. Malinowski
Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2021-214,2021
Preprint under review for ACP (discussion: open, 0 comments)
Turbulence properties in two cases of marine stratocumulus-topped boundary layer have been compared using high resolution helicopter-borne in situ measurements. In the coupled one, small-scale turbulence was close to isotropic and reasonably followed inertial range scaling according to Kolmogorov theory. In the decoupled one, turbulence was more anisotropic and the scaling deviated from theory. This was more pronounced in the cloud and subcloud layer in comparison to the surface mixed layer.
PubDate: Fri, 12 Mar 2021 08:48:30 +010
DOI: 10.5194/acp-2021-2142021
- Unraveling Pathways of Elevated Ozone Induced by the 2020 Lockdown in
Europe by an Observationally Constrained Regional Model: Non-Linear Joint
Inversion of NOx and VOC Emissions using TROPOMI
Abstract: Unraveling Pathways of Elevated Ozone Induced by the 2020 Lockdown in Europe by an Observationally Constrained Regional Model: Non-Linear Joint Inversion of NOx and VOC Emissions using TROPOMI
Amir H. Souri, Kelly Chance, Juseon Bak, Caroline R. Nowlan, Gonzalo González Abad, Yeonjin Jung, David C. Wong, Jingqiu Mao, and Xiong Liu
Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2021-121,2021
Preprint under review for ACP (discussion: open, 0 comments)
The global pandemic is believed to have an impulsive impact on emissions of air pollutants such as nitrogen dioxide (NO2) and formaldehyde (HCHO). This study rigorously quantifies the changes in the amount of NOx and VOC emissions via state-of-the-art inverse modeling technique using satellite observations during the lockdown 2020 with respect to a baseline over Europe, which in turn, it permits unraveling atmospheric processes being responsible for ozone formation.
PubDate: Fri, 12 Mar 2021 08:48:30 +010
DOI: 10.5194/acp-2021-1212021
- Spatial distributions of XCO2 seasonal cycle amplitude and phase over
northern high latitude regions
Abstract: Spatial distributions of XCO2 seasonal cycle amplitude and phase over northern high latitude regions
Nicole Jacobs, William R. Simpson, Kelly A. Graham, Christopher Holmes, Frank Hase, Thomas Blumenstock, Qiansi Tu, Matthias Frey, Manvendra K. Dubey, Harrison A. Parker, Debra Wunch, Rigel Kivi, Pauli Heikkinen, Justus Nothold, Christof Petri, and Thorsten Warneke
Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2021-185,2021
Preprint under review for ACP (discussion: open, 0 comments)
Spatial patterns of carbon dioxide seasonal cycle amplitude and summer drawdown timing derived from the OCO-2 satellite over northern high latitudes agree well with corresponding estimates from two models. The Asian Boreal Forest is anomalous with the largest amplitude and earliest seasonal drawdown. Modeled land contact tracers suggest that accumulated CO2 exchanges during atmospheric transport play a major role in shaping carbon dioxide seasonality in northern high latitude regions.
PubDate: Fri, 12 Mar 2021 08:48:30 +010
DOI: 10.5194/acp-2021-1852021
- Sensitivities to biological aerosol particle properties and ageing
processes: potential implications for aerosol–cloud interactions and
optical properties
Abstract: Sensitivities to biological aerosol particle properties and ageing processes: potential implications for aerosol–cloud interactions and optical properties
Minghui Zhang, Amina Khaled, Pierre Amato, Anne-Marie Delort, and Barbara Ervens
Atmos. Chem. Phys., 21, 3699–3724, https://doi.org/10.5194/acp-21-3699-2021, 2021
Although primary biological aerosol particles (PBAPs, bioaerosols) represent a small fraction of total atmospheric aerosol burden, they might affect climate and public health. We summarize which PBAP properties are important to affect their inclusion in clouds and interaction with light and might also affect their residence time and transport in the atmosphere. Our study highlights that not only chemical and physical but also biological processes can modify these physicochemical properties.
PubDate: Thu, 11 Mar 2021 08:53:26 +010
DOI: 10.5194/acp-21-3699-2021 2021
- Influence of the El Niño–Southern Oscillation on entry stratospheric
water vapor in coupled chemistry–ocean CCMI and CMIP6 models
Abstract: Influence of the El Niño–Southern Oscillation on entry stratospheric water vapor in coupled chemistry–ocean CCMI and CMIP6 models
Chaim I. Garfinkel, Ohad Harari, Shlomi Ziskin Ziv, Jian Rao, Olaf Morgenstern, Guang Zeng, Simone Tilmes, Douglas Kinnison, Fiona M. O'Connor, Neal Butchart, Makoto Deushi, Patrick Jöckel, Andrea Pozzer, and Sean Davis
Atmos. Chem. Phys., 21, 3725–3740, https://doi.org/10.5194/acp-21-3725-2021, 2021
Water vapor is the dominant greenhouse gas in the atmosphere, and El Niño is the dominant mode of variability in the ocean–atmosphere system. The connection between El Niño and water vapor above ~ 17 km is unclear, with single-model studies reaching a range of conclusions. This study examines this connection in 12 different models. While there are substantial differences among the models, all models appear to capture the fundamental physical processes correctly.
PubDate: Thu, 11 Mar 2021 08:53:26 +010
DOI: 10.5194/acp-21-3725-2021 2021
- Mid-latitude mixed-phase stratocumulus clouds and their interactions with
aerosols: how ice processes affect microphysical, dynamic and
thermodynamic development in those clouds and interactions'
Abstract: Mid-latitude mixed-phase stratocumulus clouds and their interactions with aerosols: how ice processes affect microphysical, dynamic and thermodynamic development in those clouds and interactions'
Seoung Soo Lee, Kyung-Ja Ha, Manguttathil Gopalakrishnan Manoj, Mohammad Kamruzzaman, Hyungjun Kim, Nobuyuki Utsumi, and Jianping Guo
Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2020-1318,2021
Preprint under review for ACP (discussion: open, 0 comments)
Using a modeling framework, a mid-latitude stratocumulus-cloud system is simulated. It is found that cloud mass in the system becomes very low due to interactions between ice and liquid particles as compared to that in the absence of ice particles. It is also found that interactions between cloud mass and aerosols lead to a reduction in cloud mass in the system and this is contrary to an aerosol-induced increase in cloud mass in the absence of ice particles.
PubDate: Thu, 11 Mar 2021 08:53:26 +010
DOI: 10.5194/acp-2020-13182021
- Spatial and temporal variations of CO2 mole fractions observed at Beijing,
Xianghe and Xinglong in North China
Abstract: Spatial and temporal variations of CO2 mole fractions observed at Beijing, Xianghe and Xinglong in North China
Yang Yang, Minqiang Zhou, Ting Wang, Bo Yao, Pengfei Han, Denghui Ji, Wei Zhou, Yele Sun, Gengchen Wang, and Pucai Wang
Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2021-103,2021
Preprint under review for ACP (discussion: open, 0 comments)
This study introduces the in situ CO2 measurement system installed in Beijing(urban), Xianghe(suburban), and Xinglong(rural) in North China for the first time. The spatial and temporal variations of CO2 mole fractions at the three sites between June 2018 and April 2020 are discussed on both seasonal and diurnal scales.
PubDate: Thu, 11 Mar 2021 08:53:26 +010
DOI: 10.5194/acp-2021-1032021
- Polycyclic aromatic hydrocarbons (PAHs) and their nitrated and
oxygenated
derivatives in the Arctic boundary layer: Seasonal trends
and local
anthropogenic influence
Abstract: Polycyclic aromatic hydrocarbons (PAHs) and their nitrated andoxygenated derivatives in the Arctic boundary layer: Seasonal trendsand local anthropogenic influence
Tatiana Drotikova, Alena Dekhtyareva, Roland Kallenborn, and Alexandre Albinet
Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2021-193,2021
Preprint under review for ACP (discussion: open, 0 comments)
86 PACs, the toxic compounds mainly emitted after combustion of fossil fuels, were measured during 8 months in the urban air of Longyearbyen (78° N, 15° E), the most populated settlement in Svalbard, the European Arctic. Contrary to a stereotype of the pristine Arctic conditions with very low human activities, considerable PAC concentrations were detected, with the spring levels comparable to the European. Air pollution was caused by local snowmobile driving in spring and shipping in summer.
PubDate: Thu, 11 Mar 2021 08:53:26 +010
DOI: 10.5194/acp-2021-1932021
- Highly Oxygenated Organic Molecules Produced by the Oxidation of
Benzene
and Toluene in a Wide Range of OH Exposure and NOx Conditions
Abstract: Highly Oxygenated Organic Molecules Produced by the Oxidation ofBenzene and Toluene in a Wide Range of OH Exposure and NOx Conditions
Xi Cheng, Qi Chen, Yong Jie Li, Yan Zheng, Keren Liao, and Guancong Huang
Atmos. Chem. Phys. Discuss., https//doi.org/10.5194/acp-2021-201,2021
Preprint under review for ACP (discussion: open, 0 comments)
In this study we conducted laboratory studies to investigate the formation of gas-phase highly oxygenated organic molecules (HOMs). We provide a thorough analysis on the importance of multi-step auto-oxidation and multi-generation OH reaction. It also gives intensive investigation on the roles of high-NO2 conditions that represent a wide range of anthropogenically influenced environments.
PubDate: Thu, 11 Mar 2021 08:53:26 +010
DOI: 10.5194/acp-2021-2012021
- Sensitivity of mixed-phase moderately deep convective clouds to
parameterizations of ice formation – an ensemble perspective
Abstract: Sensitivity of mixed-phase moderately deep convective clouds to parameterizations of ice formation – an ensemble perspective
Annette K. Miltenberger and Paul R. Field
Atmos. Chem. Phys., 21, 3627–3642, https://doi.org/10.5194/acp-21-3627-2021, 2021
The formation of ice in clouds is an important processes in mixed-phase and ice-phase clouds. However, the representation of ice formation in numerical models is highly uncertain. In the last decade, several new parameterizations for heterogeneous freezing have been proposed. Here, we investigate the impact of the parameterization choice on the representation of the convective cloud field and compare the impact to that of initial condition uncertainty.
PubDate: Wed, 10 Mar 2021 08:53:26 +010
DOI: 10.5194/acp-21-3627-2021 2021
- Source apportionment and impact of long-range transport on carbonaceous
aerosol particles in central Germany during HCCT-2010
Abstract: Source apportionment and impact of long-range transport on carbonaceous aerosol particles in central Germany during HCCT-2010
Laurent Poulain, Benjamin Fahlbusch, Gerald Spindler, Konrad Müller, Dominik van Pinxteren, Zhijun Wu, Yoshiteru Iinuma, Wolfram Birmili, Alfred Wiedensohler, and Hartmut Herrmann
Atmos. Chem. Phys., 21, 3667–3684, https://doi.org/10.5194/acp-21-3667-2021, 2021
We present results from source apportionment analysis on the carbonaceous aerosol particles, including organic aerosol (OA) and equivalent black carbon (eBC), allowing us to distinguish local emissions from long-range transport for OA and eBC sources. By merging online chemical measurements and considering particle number size distribution, the different air masses reaching the sampling place were described and discussed, based on their respective chemical composition and size distribution.
PubDate: Wed, 10 Mar 2021 08:53:26 +010
DOI: 10.5194/acp-21-3667-2021 2021
- Measurement report: PM2.5-bound nitrated aromatic compounds in Xi'an,
Northwest China – seasonal variations and contributions to optical
properties of brown carbon
Abstract: Measurement report: PM2.5-bound nitrated aromatic compounds in Xi'an, Northwest China – seasonal variations and contributions to optical properties of brown carbon
Wei Yuan, Ru-Jin Huang, Lu Yang, Ting Wang, Jing Duan, Jie Guo, Haiyan Ni, Yang Chen, Qi Chen, Yongjie Li, Ulrike Dusek, Colin O'Dowd, and Thorsten Hoffmann
Atmos. Chem. Phys., 21, 3685–3697, https://doi.org/10.5194/acp-21-3685-2021, 2021
We characterized the seasonal variations in nitrated aromatic compounds (NACs) in composition, sources, and their light absorption contribution to brown carbon (BrC) aerosol in Xi'an, Northwest China. Our results show that secondary formation and vehicular emission were dominant sources in summer (~80 %), and biomass burning and coal combustion were major sources in winter (~75 %), and they indicate that the composition and sources of NACs have a profound impact on the light absorption of BrC
PubDate: Wed, 10 Mar 2021 08:53:26 +010
DOI: 10.5194/acp-21-3685-2021 2021
- Attribution of the accelerating increase in atmospheric methane during
2010–2018 by inverse analysis of GOSAT observations
Abstract: Attribution of the accelerating increase in atmospheric methane during 2010–2018 by inverse analysis of GOSAT observations
Yuzhong Zhang, Daniel J. Jacob, Xiao Lu, Joannes D. Maasakkers, Tia R. Scarpelli, Jian-Xiong Sheng, Lu Shen, Zhen Qu, Melissa P. Sulprizio, Jinfeng Chang, A. Anthony Bloom, Shuang Ma, John Worden, Robert J. Parker, and Hartmut Boesch
Atmos. Chem. Phys., 21, 3643–3666, https://doi.org/10.5194/acp-21-3643-2021, 2021
We use 2010–2018 satellite observations of atmospheric methane to interpret the factors controlling atmospheric methane and its accelerating increase during the period. The 2010–2018 increase in global methane emissions is driven by tropical and boreal wetlands and tropical livestock (South Asia, Africa, Brazil), with an insignificant positive trend in emissions from the fossil fuel sector. The peak methane growth rates in 2014–2015 are also contributed by low OH and high fire emissions.
PubDate: Wed, 10 Mar 2021 08:53:26 +010
DOI: 10.5194/acp-21-3643-2021 2021
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