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- Title
Bridging Gas and Aerosol Properties between Northeast U.S. and Bermuda: Analysis of Eight Transit Flights.
- Authors
Soloff, Cassidy; Ajayi, Taiwo; Yonghoon Choi; Crosbie, Ewan C.; DiGangi, Joshua P.; Diskin, Glenn S.; Fenn, Marta A.; Ferrare, Richard A.; Gallo, Francesca; Hair, Johnathan W.; Hilario, Miguel Ricardo A.; Kirschler, Simon; Moore, Richard H.; Shingler, Taylor J.; Shook, Michael A.; Thornhill, Kenneth L.; Voigt, Christiane; Winstead, Edward L.; Ziemba, Luke D.; Sorooshian, Armin
- Abstract
The western North Atlantic Ocean is strongly influenced by continental outflow, making it an ideal region to study the atmospheric transition from a polluted coastline to the marine environment. Utilizing eight transit flights between NASA Langley Research Center (LaRC) in Hampton, Virginia and the remote island of Bermuda from NASA's Aerosol Cloud meTeorology Interactions oVer the western ATlantic Experiment (ACTIVATE), we examine the evolution of trace gas and aerosol properties off the U.S. East Coast. The first pair of flights flew along the wind trajectory of continental outflow, while the other flights captured a mix of marine and continental air mass sources. For measurements within the boundary layer (BL), there was an offshore decline in particle N<100 nm, N>100 nm, CH4, CO, and CO2 concentrations, all leveling off around ~900 km offshore from LaRC. These trends are strongest for the first pair of flights. In the BL, offshore declines in organic mass fraction and increases in sulfate mass fraction coincide with increasing hygroscopicity based on f(RH) measurements. Free troposphere measurements show a decline in N<100 nm but other measured parameters are more variable when compared to the prominent offshore gradients seen in the BL. Pollution layers exist in the free troposphere, such as smoke plumes, that can potentially entrain into the BL. This work provides detailed case studies with a broad set of high-resolution measurements to further our understanding of the transition between continental and marine environments.
- Subjects
ATLANTIC Coast (U.S.); HAMPTON (Va.); ATMOSPHERIC aerosols; AEROSOLS; UNITED States. National Aeronautics &; Space Administration; SMOKE plumes; BOUNDARY layer (Aerodynamics); CROWDSOURCING; AIR masses; TRACE gases; TROPOSPHERIC ozone
- Publication
Atmospheric Chemistry & Physics Discussions, 2024, p1
- ISSN
1680-7367
- Publication type
Article
- DOI
10.5194/egusphere-2024-926