A107-07
Long-range transport patterns into the tropical northwest Pacific during the CAMP2Ex aircraft campaign: chemical composition, size distributions, and the impact of convection

Thursday, 10 December 2020: 20:54
Virtual
Miguel Ricardo Hilario1,2, Ewan Crosbie3,4, Michael Shook4, Jeffrey S. Reid5, Maria Obiminda L. Cambaliza1,6, James Simpas1,6, Luke D Ziemba4, Joshua P DiGangi4, Glenn S Diskin7, Phu Nguyen8, Joseph Turk9, Edward Winstead3,4, Claire E Robinson3,4, Jian Wang10, Jiaoshi Zhang10, Yang Wang11, Subin Yoon12, James Flynn12, Sergio Luiz Alvarez12, Ali Behrangi2,13 and Armin Sorooshian2,14, (1)Manila Observatory, Quezon City, Philippines, (2)University of Arizona, Department of Hydrology and Atmospheric Sciences, Tucson, AZ, United States, (3)Science Systems and Applications, Inc., Hampton, VA, United States, (4)NASA Langley Research Center, Hampton, VA, United States, (5)Marine Meteorology Division, Monterey, CA, United States, (6)Ateneo de Manila University, Department of Physics, Quezon City, Philippines, (7)NASA Langley Research Center, Chemistry and Dynamics Branch, Hampton, VA, United States, (8)University of California Irvine, Irvine, CA, United States, (9)NASA Jet Propulsion Laboratory, Pasadena, CA, United States, (10)Washington University in St Louis, Center for Aerosol Science and Engineering, Department of Energy, Environmental and Chemical Engineering, St. Louis, MO, United States, (11)Missouri University of Science and Technology, Civil, Architectural and Environmental Engineering, Rolla, MO, United States, (12)University of Houston, Department of Earth and Atmospheric Sciences, Houston, TX, United States, (13)University of Arizona, Department of Geosciences, Tucson, AZ, United States, (14)University of Arizona, Department of Chemical and Environmental Engineering, Tucson, AZ, United States
Recorded Presentation
Abstract:
The tropical Western North Pacific (TWNP) is a receptor for multiple pollution sources throughout Asia while being highly susceptible to climate change, making it imperative to understand long-range transport in this complex aerosol-meteorological environment. Combining measurements from 24 Aug to 5 Oct 2019 during the NASA Cloud, Aerosol, and Monsoon Processes Philippines Experiment (CAMP2Ex) with back trajectories from the National Oceanic and Atmospheric Administration Hybrid Single Particle Lagrangian Integrated Trajectory Model (HYSPLIT), we examined transport into the TWNP from the Maritime Continent (MC), Peninsular Southeast Asia (PSEA), East Asia (EA), and West Pacific (WP). Pronounced wind shear associated with the southwest monsoon (before 20 Sep) led to low-level air from MC and air aloft from PSEA, resulting in distinct aerosol loading between vertical levels. During the monsoon transition (after 20 Sep), transport from EA and WP were driven by Pacific northeasterlies, continental anticyclones, and well-developed cyclones over the East China Sea. Composition profiles of the regions were delineated primarily by emission source and passage through convective regions, indicated by accumulated precipitation along trajectories (APT). Comparing transport of low APT and high transport efficiency (ΔBC/ΔCO) reveals distinct boundary layer composition: MC air was characterized by biomass burning tracers (CO, NO3-, organics) while major components of EA air (O3, CH4, NH4+, SO42-) pointed to anthropogenic outflow and secondary formation. Comparing transport by APT suggests particle scavenging in PSEA air, which had lower levels of anthropogenic species, higher APT, lower ΔBC/ΔCO, and smaller particle sizes than MC and EA air. Such differences are explainable by the lofting and scavenging of PSEA air over convective areas. As a result, PSEA air was to some degree more similar to that of WP than those of MC and EA, particularly for PSEA air lofted into the free troposphere. Understanding long-range transport in the TWNP and processes impacting air masses are important for improving modeling of the aerosol lifecycle in this meteorologically complex region as well as guiding international policymaking on public health and climate.
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