Fractal-like Tar Ball Aggregates from Wildfire Smoke
© 2018 American Chemical Society. Tar balls are atmospheric particles that are abundant in slightly aged biomass burning smoke and have a significant, but highly uncertain, role in Earth's radiative balance. Tar balls are typically detected using electron microscopy and generally, they are obse...
Published in: | Environmental Science & Technology Letters |
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ftmichigantuniv:oai:digitalcommons.mtu.edu:michigantech-p-27103 2023-05-15T17:33:18+02:00 Fractal-like Tar Ball Aggregates from Wildfire Smoke Girotto, Giulia China, Swarup Bhandari, Janarjan Gorkowski, Kyle Scarnato, Barbara V. Capek, Tyler Marinoni, Angela Veghte, Daniel P. Kulkarni, Gourihar Aiken, Allison C. Dubey, Manvendra Mazzoleni, Claudio 2018-06-12T07:00:00Z https://digitalcommons.mtu.edu/michigantech-p/7801 https://doi.org/10.1021/acs.estlett.8b00229 unknown Digital Commons @ Michigan Tech https://digitalcommons.mtu.edu/michigantech-p/7801 https://doi.org/10.1021/acs.estlett.8b00229 Michigan Tech Publications text 2018 ftmichigantuniv https://doi.org/10.1021/acs.estlett.8b00229 2022-04-28T17:40:35Z © 2018 American Chemical Society. Tar balls are atmospheric particles that are abundant in slightly aged biomass burning smoke and have a significant, but highly uncertain, role in Earth's radiative balance. Tar balls are typically detected using electron microscopy and generally, they are observed as individual spheres. Here, we report new observations of a significant fraction of tar ball aggregates (∼27% by number) from samples collected in a plume of the Whitewater-Baldy Complex fire in New Mexico. The structure of these aggregates is fractal-like and follows a scale invariant power law similar to that of soot particles, despite the considerably larger size and smaller number of monomers. We also present observations of tar ball aggregates from four other geographical locations, including a remote high-elevation site in the North Atlantic Ocean. Aggregation affects the particle optical properties and, therefore, their climatic impact. We performed numerical simulations based on the observed morphology and estimated the effects of aggregation on the optical properties of the tar balls. On the basis of single-particle numerical simulations, we find that aggregates had a single scattering albedo up to 41% and 23% higher than that of individual tar balls at 550 nm and 350 nm, respectively. Text North Atlantic Michigan Technological University: Digital Commons @ Michigan Tech Environmental Science & Technology Letters 5 6 360 365 |
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Michigan Technological University: Digital Commons @ Michigan Tech |
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© 2018 American Chemical Society. Tar balls are atmospheric particles that are abundant in slightly aged biomass burning smoke and have a significant, but highly uncertain, role in Earth's radiative balance. Tar balls are typically detected using electron microscopy and generally, they are observed as individual spheres. Here, we report new observations of a significant fraction of tar ball aggregates (∼27% by number) from samples collected in a plume of the Whitewater-Baldy Complex fire in New Mexico. The structure of these aggregates is fractal-like and follows a scale invariant power law similar to that of soot particles, despite the considerably larger size and smaller number of monomers. We also present observations of tar ball aggregates from four other geographical locations, including a remote high-elevation site in the North Atlantic Ocean. Aggregation affects the particle optical properties and, therefore, their climatic impact. We performed numerical simulations based on the observed morphology and estimated the effects of aggregation on the optical properties of the tar balls. On the basis of single-particle numerical simulations, we find that aggregates had a single scattering albedo up to 41% and 23% higher than that of individual tar balls at 550 nm and 350 nm, respectively. |
format |
Text |
author |
Girotto, Giulia China, Swarup Bhandari, Janarjan Gorkowski, Kyle Scarnato, Barbara V. Capek, Tyler Marinoni, Angela Veghte, Daniel P. Kulkarni, Gourihar Aiken, Allison C. Dubey, Manvendra Mazzoleni, Claudio |
spellingShingle |
Girotto, Giulia China, Swarup Bhandari, Janarjan Gorkowski, Kyle Scarnato, Barbara V. Capek, Tyler Marinoni, Angela Veghte, Daniel P. Kulkarni, Gourihar Aiken, Allison C. Dubey, Manvendra Mazzoleni, Claudio Fractal-like Tar Ball Aggregates from Wildfire Smoke |
author_facet |
Girotto, Giulia China, Swarup Bhandari, Janarjan Gorkowski, Kyle Scarnato, Barbara V. Capek, Tyler Marinoni, Angela Veghte, Daniel P. Kulkarni, Gourihar Aiken, Allison C. Dubey, Manvendra Mazzoleni, Claudio |
author_sort |
Girotto, Giulia |
title |
Fractal-like Tar Ball Aggregates from Wildfire Smoke |
title_short |
Fractal-like Tar Ball Aggregates from Wildfire Smoke |
title_full |
Fractal-like Tar Ball Aggregates from Wildfire Smoke |
title_fullStr |
Fractal-like Tar Ball Aggregates from Wildfire Smoke |
title_full_unstemmed |
Fractal-like Tar Ball Aggregates from Wildfire Smoke |
title_sort |
fractal-like tar ball aggregates from wildfire smoke |
publisher |
Digital Commons @ Michigan Tech |
publishDate |
2018 |
url |
https://digitalcommons.mtu.edu/michigantech-p/7801 https://doi.org/10.1021/acs.estlett.8b00229 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Michigan Tech Publications |
op_relation |
https://digitalcommons.mtu.edu/michigantech-p/7801 https://doi.org/10.1021/acs.estlett.8b00229 |
op_doi |
https://doi.org/10.1021/acs.estlett.8b00229 |
container_title |
Environmental Science & Technology Letters |
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5 |
container_issue |
6 |
container_start_page |
360 |
op_container_end_page |
365 |
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1766131770772684800 |