Aerosol responses to precipitation along North American air trajectories arriving at Bermuda

North American pollution outflow is ubiquitous over the western North Atlantic Ocean, especially in winter, making this location a suitable natural laboratory for investigating the impact of precipitation on aerosol particles along air mass trajectories. We take advantage of observational data colle...

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Bibliographic Details
Published in:Atmospheric Chemistry and Physics
Main Authors: H. Dadashazar, M. Alipanah, M. R. A. Hilario, E. Crosbie, S. Kirschler, H. Liu, R. H. Moore, A. J. Peters, A. J. Scarino, M. Shook, K. L. Thornhill, C. Voigt, H. Wang, E. Winstead, B. Zhang, L. Ziemba, A. Sorooshian
Format: Article in Journal/Newspaper
Language:English
Published: Copernicus Publications 2021
Subjects:
Physics
QC1-999
Chemistry
QD1-999
North Atlantic
Online Access:https://doi.org/10.5194/acp-21-16121-2021
https://doaj.org/article/a60d2bd817764bd0b1e3b69c9b680471
Description
Summary:North American pollution outflow is ubiquitous over the western North Atlantic Ocean, especially in winter, making this location a suitable natural laboratory for investigating the impact of precipitation on aerosol particles along air mass trajectories. We take advantage of observational data collected at Bermuda to seasonally assess the sensitivity of aerosol mass concentrations and volume size distributions to accumulated precipitation along trajectories (APT). The mass concentration of particulate matter with aerodynamic diameter less than 2.5 µm normalized by the enhancement of carbon monoxide above background (PM <math xmlns="http://www.w3.org/1998/Math/MathML" id="M2" display="inline" overflow="scroll" dspmath="mathml"><mrow><msub><mi/><mn mathvariant="normal">2.5</mn></msub><mo>/</mo><mi mathvariant="normal">Δ</mi></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="28pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="5ae6b0495bee251fbac1bfef6bb6209c"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="acp-21-16121-2021-ie00001.svg" width="28pt" height="14pt" src="acp-21-16121-2021-ie00001.png"/></svg:svg> CO) at Bermuda was used to estimate the degree of aerosol loss during transport to Bermuda. Results for December–February (DJF) show that most trajectories come from North America and have the highest APTs, resulting in a significant reduction (by 53 %) in PM <math xmlns="http://www.w3.org/1998/Math/MathML" id="M3" display="inline" overflow="scroll" dspmath="mathml"><mrow><msub><mi/><mn mathvariant="normal">2.5</mn></msub><mo>/</mo><mi mathvariant="normal">Δ</mi></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="28pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="c8fdc99ec2b4407938f2aa5aba123896"><svg:image ...

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