GSI 3DVar-Based Ensemble―Variational Hybrid Data Assimilation for NCEP Global Forecast System: Single-Resolution Experiments von XUGUANG WANG, PARRISH, David, KLEIST, Daryl, WHITAKER, Jeffrey

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Clean Air for Megacities von Parrish, David D., Zhu, Tong

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Long-term trend of ozone pollution in China during 2014–2020: distinct seasonal and spatial characteristics and ozone sensitivity von Wang, Wenjie, Parrish, David D, Wang, Siwen, Bao, Fengxia, Ni, Ruijing, Li, Xin, Yang, Suding, Wang, Hongli, Cheng, Yafang, Su, Hang

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Air quality progress in North American megacities: A review von Parrish, David D., Singh, Hanwant B., Molina, Luisa, Madronich, Sasha

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Challenges of a lowered U.S. ozone standard von Cooper, Owen R, Langford, Andrew O, Parrish, David D, Fahey, David W

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Volatile organic compounds (VOCs) in urban air: How chemistry affects the interpretation of positive matrix factorization (PMF) analysis von Yuan, Bin, Shao, Min, de Gouw, Joost, Parrish, David D., Lu, Sihua, Wang, Ming, Zeng, Limin, Zhang, Qian, Song, Yu, Zhang, Jianbo, Hu, Min

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Critical evaluation of US on-road vehicle emission inventories von Parrish, David D.

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Chemical data quantify Deepwater Horizon hydrocarbon flow rate and environmental distribution von Ryerson, Thomas B., Camilli, Richard, Kessler, John D., Kujawinski, Elizabeth B., Reddy, Christopher M., Valentine, David L., Atlas, Elliot, Blake, Donald R., de Gouw, Joost, Meinardi, Simone, Parrish, David D., Peischl, Jeff, Seewald, Jeffrey S., Warneke, Carsten

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Quantifying the role of PM2.5 dropping in variations of ground-level ozone: Inter-comparison between Beijing and Los Angeles von Shao, Min, Wang, Wenjie, Yuan, Bin, Parrish, David D., Li, Xin, Lu, Keding, Wu, Luolin, Wang, Xuemei, Mo, Ziwei, Yang, Suxia, Peng, Yuwen, Kuang, Ye, Chen, Weihua, Hu, Min, Zeng, Limin, Su, Hang, Cheng, Yafang, Zheng, Junyu, Zhang, Yuanhang

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Multiyear trends in volatile organic compounds in Los Angeles, California: Five decades of decreasing emissions von Warneke, Carsten, de Gouw, Joost A., Holloway, John S., Peischl, Jeff, Ryerson, Thomas B., Atlas, Elliot, Blake, Don, Trainer, Michael, Parrish, David D.

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Exploring the drivers of the increased ozone production in Beijing in summertime during 2005–2016 von Wang, Wenjie, Parrish, David D, Li, Xin, Shao, Min, Liu, Ying, Mo, Ziwei, Lu, Sihua, Hu, Min, Fang, Xin, Wu, Yusheng, Zeng, Limin, Zhang, Yuanhang

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Opinion: Establishing a science-into-policy process for tropospheric ozone assessment von Derwent, Richard G, Parrish, David D, Faloona, Ian C

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Introduction of the GSI into the NCEP Global Data Assimilation System von KLEIST, Daryl T, PARRISH, David F, DERBER, John C, TREADON, Russ, WU, Wan-Shu, LORD, Stephen

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Analysis of long‐term observations of NOx and CO in megacities and application to constraining emissions inventories von Hassler, Birgit, McDonald, Brian C., Frost, Gregory J., Borbon, Agnes, Carslaw, David C., Civerolo, Kevin, Granier, Claire, Monks, Paul S., Monks, Sarah, Parrish, David D., Pollack, Ilana B., Rosenlof, Karen H., Ryerson, Thomas B., Schneidemesser, Erika, Trainer, Michael

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Letter to the Editor: Biopsy Decisions von Parrish, David O, Finer, Christa M, Nedresky, Daniel A

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Estimating background contributions and US anthropogenic enhancements to maximum ozone concentrations in the northern US von Parrish, David D, Ennis, Christine A

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Changes in Anthropogenic Precursor Emissions Drive Shifts in the Ozone Seasonal Cycle Throughout the Northern Midlatitude Troposphere von Bowman, Henry, Turnock, Steven T., Bauer, Susanne E, Tsigaridis, Konstantinos, Deushi, Makoto, Oshima, Naga, O'Connor, Fiona M, Horowitz, Larry, Wu, Tongwen, Kubistin, Dagmar, Parrish, David D

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Impacts of Varying Estuarine Temperature and Light Conditions on Zostera marina (Eelgrass) and its Interactions With Ruppia maritima (Widgeongrass) von Moore, Kenneth A, Shields, Erin C, Parrish, David B

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Technical note: Northern midlatitude baseline ozone – long-term changes and the COVID-19 impact von Parrish, David D, Derwent, Richard G, Faloona, Ian C, Mims, Charles A

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The formation and mitigation of nitrate pollution: comparison between urban and suburban environments von Yang, Suxia, Yuan, Bin, Peng, Yuwen, Huang, Shan, Chen, Wei, Hu, Weiwei, Pei, Chenglei, Zhou, Jun, Parrish, David D, Wang, Wenjie, He, Xianjun, Cheng, Chunlei, Li, Xiao-Bing, Yang, Xiaoyun, Song, Yu, Wang, Haichao, Qi, Jipeng, Wang, Baolin, Wang, Chen, Wang, Chaomin, Wang, Zelong, Li, Tiange, Zheng, E, Wang, Sihang, Wu, Caihong, Cai, Mingfu, Ye, Chenshuo, Song, Wei, Cheng, Peng, Chen, Duohong, Wang, Xinming, Zhang, Zhanyi, Wang, Xuemei, Zheng, Junyu, Shao, Min

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