External particle mixing influences hygroscopicity in a sub-urban area by S. Deshmukh, L. Poulain, B. Wehner, S. Henning, J.-E. Petit, P. Fombelle, P. Fombelle, O. Favez, H. Herrmann, M. Pöhlker, M. Pöhlker

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Chemical Characterization of Marine Aerosols in a South Mediterranean Coastal Area Located in Bou Ismaïl, Algeria by Sidali Khedidji, Konrad Müller, Lyes Rabhi, Gerald Spindler, Khanneh Wadinga Fomba, Dominik van Pinxteren, Noureddine Yassaa, Hartmut Herrmann

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The Small Mobile Ozone Lidar (SMOL): instrument description and first results by F. Chouza, T. Leblanc, P. Wang, S. S. Brown, K. Zuraski, K. Zuraski, W. Chace, W. Chace, W. Chace, C. C. Womack, C. C. Womack, J. Peischl, J. Peischl, J. Hair, T. Shingler, J. Sullivan

“…<p>Ozone profile measurements at high temporal and vertical resolution are needed to better understand physical and chemical processes driving tropospheric ozone variability and to validate the tropospheric ozone measurements from spaceborne missions such as TEMPO (Tropospheric Emissions: Monitoring Pollution). …”
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The temporal evolution of HCHO and changes in atmospheric composition in the southeast of the United Kingdom by Balendra V.S. Chauhan, Kirsty L. Smallbone, Maureen Berg, Kevin P. Wyche

“…This case study investigates seasonal variations in HCHO concentrations and their relationship with tropospheric ozone (O3) levels in the Southeast of the United Kingdom. …”
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Polar mesospheric ozone loss initiates downward coupling of solar signal in the Northern Hemisphere by Annika Seppälä, Niilo Kalakoski, Pekka T. Verronen, Daniel R. Marsh, Alexey Yu. Karpechko, Monika E. Szelag

“…Here we show that initial reduction of polar mesospheric ozone and the resulting change in atmospheric heating rapidly couples to dynamics, transferring the signal downwards, shifting the tropospheric jet polewards. This pathway is not constrained to the polar vortex. …”
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Quantifying uncertainties in satellite NO₂ superobservations for data assimilation and model evaluation by P. Rijsdijk, P. Rijsdijk, P. Rijsdijk, H. Eskes, A. Dingemans, A. Dingemans, K. F. Boersma, K. F. Boersma, T. Sekiya, K. Miyazaki, S. Houweling, S. Houweling

“…<p>Satellite observations of tropospheric trace gases and aerosols are evolving rapidly. …”
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Global seasonal urban, industrial, and background NO₂ estimated from TROPOMI satellite observations by V. Fioletov, C. A. McLinden, D. Griffin, X. Zhao, H. Eskes

“…<p>The tropospheric NO<span class="inline-formula">₂</span> vertical column density (VCD) values measured by the Tropospheric Monitoring Instrument (TROPOMI) were used to study the NO<span class="inline-formula">₂</span> variability and estimate urban NO<span class="inline-formula">_<i>x</i></span> emissions for 261 major cities worldwide. …”
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Indoor Black Carbon Concentrations and their Sources in Residential Environments: Validation of an Input-adaptive Proxy Model by Jiangyue Zhao, Pak Lun Fung, Martha Arbayani Zaidan, Birgit Wehner, Kay Weinhold, Alfred Wiedensohler, Tareq Hussein

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Operational Monitoring of Trace Gases over the Mediterranean Sea by Giuseppe Grieco, Guido Masiello, Carmine Serio

“…IASI retrievals show a marked southeastern gradient, which is shown to be consistent with the general tropospheric circulation over the Mediterranean basin. …”
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Impact of COVID-19 on the Air Quality over China and India Using Long-term (2009–2020) Multi-satellite Data by Manish Soni, Sunita Verma, Hiren Jethava, Swagata Payra, Lok Lamsal, Priyanshu Gupta, Janhavi Singh

“…Over China, during COVID-19 lockdown a significant drop in columnar abundances of tropospheric NO2 (–37%), SO2 (–64%) and AOD (–8%) for 2020 in comparison to 11 years mean (2009–19) has been observed. …”
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Surprising Changes in Aerosol Loading over India amid COVID-19 Lockdown by Satyendra K. Pandey, V. Vinoj

“…A simultaneous increase (decrease) in mid-tropospheric relative humidity (wind speed (WS) at 850 hPa) by +85 ± 6.0% (–12 ± 3.9%) occurred during the lockdown. …”
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Then and Now: COVID-19 Pandemic Lockdown Misfire Atmospheric Methane over India by Manoj Hari, Rajesh Kumar Sahu, MS Shyam Sunder, Bhishma Tyagi

“…The present study has analyzed the tropospheric CH4 trends over India during the pre-monsoon season (March-May) for 2003-2021 using AIRS data. …”
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An Overview on the Role of Relative Humidity in Airborne Transmission of SARS-CoV-2 in Indoor Environments by Ajit Ahlawat, Alfred Wiedensohler, Sumit Kumar Mishra

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Impact of COVID-19 Pandemic on Air Pollution in Poland Based on Surface Measurements and Satellite Data by Mikalai Filonchyk, Volha Hurynovich, Haowen Yan

“…During this study, aerosol optical depth (AOD) observations from the Moderate Resolution Imaging Spectroradiometer (MODIS) were used along with tropospheric NO2 and SO2 vertical column densities from TROPOspheric Monitoring Instrument (TROPOMI). …”
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Atmospheric Pollutants Assessment during the COVID-19 Lockdown Using Remote Sensing and Ground-based Measurements in Buenos Aires, Argentina by Natacha S. Represa, Lara S. Della Ceca, Gabriela Abril, María F. García Ferreyra, Carlos M. Scavuzzo

“…Also, we observed a reduction of the tropospheric NO2 column density mean by 54% at urban stations, and AOD values decreased between 38% and 66% during 2020. …”
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Doppler Positioning Performance of LEO Mega Constellation by Yulu ZHANG, Zhen LI, Chuang SHI, Guifei JING

“…This paper proposed a Doppler-only point-solution algorithm and analyzed the Doppler positioning performance based on the Starlink constellation.The Doppler positioning accuracy was about 3～6 m.To achieve the meter-level positioning accuracy, the satellite position and velocity errors should be within several meters and several centimeters per second, respectively.The ionospheric delay rates of C-band signal would cause about 2 m error in Doppler positioning.The positioning error would increase by dozens of meters if there were no corrections for the tropospheric errors.To ensure convergence in the LEO-based Doppler positioning, the initial receiver position error should be less than 300 km when the satellites orbit at an altitude of 550 km.…”
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Evaluation of the WRF-Chem performance for the air pollutants over the United Arab Emirates by Y. Yarragunta, D. Francis, R. Fonseca, N. Nelli

“…The comparison with TROPOMI column concentrations demonstrates that WRF-Chem performs well in simulating the spatio-temporal patterns of total column CO and tropospheric column NO<span class="inline-formula">₂</span> and O<span class="inline-formula">₃</span>, despite certain deficiencies in modelling tropospheric NO<span class="inline-formula">₂</span> column concentrations. …”
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Month-to-Month Variability of Autumn Sea Ice in the Barents and Kara Seas and Its Relationship to Winter Air Temperature in China by Chuhan Lu, Kaili Li, Shaoqing Xie, Zhaomin Wang, Yujing Qin

“…This regional tropospheric warming results in a higher barotropic positive height anomaly over the Ural Mountains, and then more active cold advection from the high latitude affects East Asia.…”
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Discriminating between “drizzle or rain” and sea salt aerosols in Cloudnet for measurements over the Barbados Cloud Observatory by J. Roschke, J. Witthuhn, J. Witthuhn, M. Klingebiel, M. Haarig, A. Foth, A. Kötsche, H. Kalesse-Los

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Sporadic E responds to the 2022 Tonga volcano eruptions recorded by the Meridian Project by YangYi Sun, Tao Yu, Jin Wang, Chi Long

“…The occurred intermittently after 13:00 UT following the arrival of the tropospheric Lamb wave. To examine the causal mechanism for the intermittence, we also included data of horizontal winds in the mesosphere and lower thermosphere region recorded by the meteor radars at Wuhan and Mohe in this study. …”
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