An evaluation of the ability of the Ozone Monitoring Instrument (OMI) to observe boundary layer ozone pollution across China: application to 2005–2017 ozone trends by L. Shen, D. J. Jacob, X. Liu, G. Huang, K. Li, H. Liao, T. Wang

“…<p>Nadir-viewing satellite observations of tropospheric ozone in the UV have been shown to have some sensitivity to boundary layer ozone pollution episodes, but so far they have not yet been compared to surface ozone observations collected by large-scale monitoring networks. …”
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Global ozone–CO correlations from OMI and AIRS: constraints on tropospheric ozone sources by P. S. Kim, D. J. Jacob, X. Liu, J. X. Warner, K. Yang, K. Chance, V. Thouret, P. Nedelec

“…We present a global data set of free tropospheric ozone–CO correlations with 2° × 2.5° spatial resolution from the Ozone Monitoring Instrument (OMI) and Atmospheric Infrared Sounder (AIRS) satellite instruments for each season of 2008. …”
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Validation of OMI total ozone retrievals from the SAO ozone profile algorithm and three operational algorithms with Brewer measurements by J. Bak, X. Liu, J. H. Kim, K. Chance, D. P. Haffner

“…The accuracy of total ozone computed from the Smithsonian Astrophysical Observatory (SAO) optimal estimation (OE) ozone profile algorithm (SOE) applied to the Ozone Monitoring Instrument (OMI) is assessed through comparisons with ground-based Brewer spectrometer measurements from 2005 to 2008. …”
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Improvement of OMI ozone profile retrievals in the upper troposphere and lower stratosphere by the use of a tropopause-based ozone profile climatology by J. Bak, X. Liu, J. C. Wei, L. L. Pan, K. Chance, J. H. Kim

“…Motivated by the need of obtaining a more accurate global ozone distribution in the upper troposphere and lower stratosphere (UTLS), we have investigated the use of a tropopause-based (TB) ozone climatology in ozone profile retrieval from the Ozone Monitoring Instrument (OMI). …”
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The Ozone Monitoring Instrument: overview of 14 years in space by P. F. Levelt, P. F. Levelt, J. Joiner, J. Tamminen, J. P. Veefkind, J. P. Veefkind, P. K. Bhartia, D. C. Stein Zweers, B. N. Duncan, D. G. Streets, H. Eskes, R. van der A, C. McLinden, V. Fioletov, S. Carn, J. de Laat, M. DeLand, S. Marchenko, R. McPeters, J. Ziemke, J. Ziemke, D. Fu, X. Liu, K. Pickering, K. Pickering, A. Apituley, G. González Abad, A. Arola, F. Boersma, F. Boersma, C. Chan Miller, K. Chance, M. de Graaf, J. Hakkarainen, S. Hassinen, I. Ialongo, Q. Kleipool, N. Krotkov, C. Li, L. Lamsal, P. Newman, C. Nowlan, R. Suleiman, L. G. Tilstra, O. Torres, H. Wang, K. Wargan, K. Wargan

“…This overview paper highlights the successes of the Ozone Monitoring Instrument (OMI) on board the Aura satellite spanning a period of nearly 14 years. …”
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Temporal variability of tropospheric ozone and ozone profiles in the Korean Peninsula during the East Asian summer monsoon: insights from multiple measurements and reanalysis datasets by J. Bak, E.-J. Song, E.-J. Song, H.-J. Lee, H.-J. Lee, X. Liu, J.-H. Koo, J. Kim, W. Jeon, W. Jeon, J.-H. Kim, C.-H. Kim, C.-H. Kim

“…<p>We investigate the temporal variations of ground-level ozone and balloon-based ozone profiles at Pohang (36.02<span class="inline-formula">^∘</span> N, 129.23<span class="inline-formula">^∘</span> E) in the Korean Peninsula. …”
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Trans-Pacific transport of reactive nitrogen and ozone to Canada during spring by T. W. Walker, R. V. Martin, A. van Donkelaar, W. R. Leaitch, A. M. MacDonald, K. G. Anlauf, R. C. Cohen, T. H. Bertram, L. G. Huey, M. A. Avery, A. J. Weinheimer, F. M. Flocke, D. W. Tarasick, A. M. Thompson, D. G. Streets, X. Liu

“…Enhancements of ozone over Canada from Asian anthropogenic emissions reflect a combination of trans-Pacific transport of ozone produced over Asia, and ozone produced in the eastern Pacific through decomposition of peroxyacetyl nitrates (PANs). …”
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Remote sensed and in situ constraints on processes affecting tropical tropospheric ozone by B. Sauvage, R. V. Martin, R. V. Martin, A. van Donkelaar, X. Liu, K. Chance, L. Jaeglé, P. I. Palmer, S. Wu, T.-M. Fu

“…We use a global chemical transport model (GEOS-Chem) to evaluate the consistency of satellite measurements of lightning flashes and ozone precursors with in situ measurements of tropical tropospheric ozone. …”
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Transport of substantial stratospheric ozone to the surface by a dying typhoon and shallow convection by Z. Chen, Z. Chen, J. Liu, J. Liu, X. Qie, X. Cheng, Y. Shen, M. Yang, R. Jiang, X. Liu

“…<p>Stratospheric ozone transported to the troposphere is estimated to account for 5 %–15 % of the tropospheric ozone sources. …”
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Improved ozone profile retrievals from GOME data with degradation correction in reflectance by X. Liu, K. Chance, T. P. Kurosu

“…These results are consistent with previous studies using radiative transfer models and ozone observations. The degradation causes retrieval biases of up to ~3% (10 DU, 1 DU=2.69&times;10¹⁶ molecules cm^&minus;2), 30% (10 DU), 10%, and 40% in total column ozone, tropospheric column ozone, stratospheric ozone and tropospheric ozone, respectively, from our GOME ozone profile retrieval algorithm. …”
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Tropical tropospheric ozone derived using Clear-Cloudy Pairs (CCP) of TOMS measurements by M. J. Newchurch, D. Sun, J. H. Kim, X. Liu, X. Liu

“…Using TOMS total-ozone measurements over high-altitude cloud locations and nearby paired clear locations, we describe the Clear-Cloudy Pairs (CCP) method for deriving tropical tropospheric ozone. …”
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Associations of interannual variation in summer tropospheric ozone with the Western Pacific Subtropical High in China from 1999 to 2017 by X. Zhang, R. Zhugu, X. Jian, X. Liu, K. Chen, S. Tao, J. Liu, H. Gao, T. Huang, J. Ma

“…<p>Associations between tropospheric ozone (<span class="inline-formula">O₃</span>) and climate variations have been extensively investigated worldwide. …”
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Understanding offshore high-ozone events during TRACER-AQ 2021 in Houston: insights from WRF–CAMx photochemical modeling by W. Li, Y. Wang, X. Liu, E. Soleimanian, T. Griggs, J. Flynn, P. Walter

“…<p>Mechanisms for high offshore ozone (<span class="inline-formula">O₃</span>) events in the Houston area have not been systematically examined due to limited <span class="inline-formula">O₃</span> measurements over water. …”
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An improved OMI ozone profile research product version 2.0 with collection 4 L1b data and algorithm updates by J. Bak, X. Liu, K. Yang, G. Gonzalez Abad, E. O'Sullivan, K. Chance, C.-H. Kim, C.-H. Kim

“…<p>We describe the new and improved version 2 of the ozone profile research product from the Ozone Monitoring Instrument (OMI) on the Aura satellite. …”
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Evaluating WRF-GC v2.0 predictions of boundary layer height and vertical ozone profile during the 2021 TRACER-AQ campaign in Houston, Texas by X. Liu, Y. Wang, S. Wasti, W. Li, E. Soleimanian, J. Flynn, T. Griggs, S. Alvarez, J. T. Sullivan, M. Roots, L. Twigg, G. Gronoff, T. Berkoff, P. Walter, M. Estes, J. W. Hair, T. Shingler, A. J. Scarino, M. Fenn, L. Judd

“…The model underestimates free-tropospheric ozone (2–3 km aloft) by 9 %–22 % but overestimates near-ground ozone (<span class="inline-formula">&lt;50</span> m aloft) by 6 %-39 % during the two ozone episodes. …”
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Intensive photochemical oxidation in the marine atmosphere: evidence from direct radical measurements by G. Zhang, G. Zhang, R. Hu, P. Xie, P. Xie, P. Xie, C. Hu, X. Liu, L. Zhong, H. Cai, B. Zhu, S. Xia, X. Huang, X. Li, W. Liu

“…For coastal cities, the particularity of the HONO chemistry tends to influence the ozone-sensitive system and eventually magnifies the background ozone. …”
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GEM-AQ, an on-line global multiscale chemical weather modelling system: model description and evaluation of gas phase chemistry processes by J. W. Kaminski, L. Neary, J. Struzewska, J. C. McConnell, A. Lupu, J. Jarosz, K. Toyota, S. L. Gong, J. Côté, X. Liu, K. Chance, A. Richter

“…We find that GEM-AQ is able to capture the spatial details of the chemical fields in the middle and lower troposphere. The modelled ozone consistently shows good agreement with observations, except over tropical oceans. …”
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Rapid O₃ assimilations – Part 1: Background and local contributions to tropospheric O₃ changes in China in 2015–2020 by R. Zhu, Z. Tang, X. Chen, X. Liu, Z. Jiang

“…<p>A single ozone (O<span class="inline-formula">₃</span>) tracer mode was developed in this work to build the capability of the Goddard Earth Observing System model with Chemistry (GEOS-Chem) for rapid O<span class="inline-formula">₃</span> simulation. …”
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Characterization of errors in satellite-based HCHO&thinsp;∕&thinsp;NO₂ tropospheric column ratios with respect to chemistry, column-to-PBL translation, spatial represent... by A. H. Souri, A. H. Souri, A. H. Souri, M. S. Johnson, G. M. Wolfe, J. H. Crawford, A. Fried, A. Wisthaler, A. Wisthaler, W. H. Brune, D. R. Blake, A. J. Weinheimer, T. Verhoelst, S. Compernolle, G. Pinardi, C. Vigouroux, B. Langerock, S. Choi, S. Choi, L. Lamsal, L. Lamsal, L. Zhu, L. Zhu, S. Sun, S. Sun, R. C. Cohen, R. C. Cohen, K.-E. Min, C. Cho, S. Philip, X. Liu, K. Chance

“…This implies that the FNR has an inherent 20 % standard error (<span class="inline-formula">1<i>σ</i></span>) resulting from not accurately describing the <span class="inline-formula">RO_<i>x</i></span>–<span class="inline-formula">HO_<i>x</i></span> cycle. We calculate high ozone production rates (PO<span class="inline-formula">₃</span>) dominated by large HCHO <span class="inline-formula">×</span> NO<span class="inline-formula">₂</span> concentration levels, a new proxy for the abundance of ozone precursors. …”
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Rapid O₃ assimilations – Part 2: Tropospheric O₃ changes accompanied by declining NO_<i>x</i> emissions in the USA and Europe in 2005–2020 by R. Zhu, Z. Tang, X. Chen, X. Liu, Z. Jiang

“…Here we investigate the changes in surface and free-tropospheric O<span class="inline-formula">₃</span> accompanied by NO<span class="inline-formula">₂</span> changes over the USA and Europe in 2005–2020 by assimilating the Ozone Monitoring Instrument (OMI) and U.S. Air Quality System (AQS) and European AirBase network O<span class="inline-formula">₃</span> observations. …”
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