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Cloud System Evolution in the Trades (CSET): Following the Evolution of Boundary Layer Cloud Systems with the NSF–NCAR GV

https://doi.org/10.1175/BAMS-D-17-0180.1

Albrecht, Bruce ; Ghate, Virendra ; Mohrmann, Johannes ; Wood, Robert ; Zuidema, Paquita ; Bretherton, Christopher ; Schwartz, Christian ; Eloranta, Edwin ; Glienke, Susanne ; Donaher, Shaunna ; et al ( January 2019 , Bulletin of the American Meteorological Society)

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Chemical feedbacks weaken the wintertime response of particulate sulfate and nitrate to emissions reductions over the eastern United States

https://doi.org/10.1073/pnas.1803295115

Shah, Viral ; Jaeglé, Lyatt ; Thornton, Joel A. ; Lopez-Hilfiker, Felipe D. ; Lee, Ben H. ; Schroder, Jason C. ; Campuzano-Jost, Pedro ; Jimenez, Jose L. ; Guo, Hongyu ; Sullivan, Amy P. ; et al ( July 2018 , Proceedings of the National Academy of Sciences)
Widespread Pollution From Secondary Sources of Organic Aerosols During Winter in the Northeastern United States

https://doi.org/10.1029/2018GL081530

Shah, Viral ; Jaeglé, Lyatt ; Jimenez, Jose L. ; Schroder, Jason C. ; Campuzano‐Jost, Pedro ; Campos, Teresa L. ; Reeves, John M. ; Stell, Meghan ; Brown, Steven S. ; Lee, Ben H. ; et al ( March 2019 , Geophysical Research Letters)

Abstract
Secondary organic aerosol (SOA) from pollution sources is thought to be a minor component of organic aerosol (OA) and fine particulate matter beyond the urban scale. Here we present airborne observations of OA in the northeastern United States, showing that 58% of OA over the region during winter is secondary and originates from pollution sources. We observed a doubling of OA mass from SOA formation in aged emissions, with unexpected similarity to OA growth observed in polluted areas in the summer. A regional model with a simple SOA parameterization based on summer measurements reproduces these winter observations and shows that pollution SOA is widespread, accounting for 14% of submicron particulate matter in near‐surface air. This source of particulate matter is largely unaccounted for in air quality management in the northeastern United States and other polluted areas.

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Stratospheric Injection of Brominated Very Short-Lived Substances: Aircraft Observations in the Western Pacific and Representation in Global Models

https://doi.org/10.1029/2017JD027978

Wales, Pamela A. ; Salawitch, Ross J. ; Nicely, Julie M. ; Anderson, Daniel C. ; Canty, Timothy P. ; Baidar, Sunil ; Dix, Barbara ; Koenig, Theodore K. ; Volkamer, Rainer ; Chen, Dexian ; et al ( May 2018 , Journal of Geophysical Research: Atmospheres)