Extensive Soot Compaction by Cloud Processing from Laboratory and Field Observations

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Bhandari , J , China , S , Chandrakar , K K , Kinney , G , Cantrell , W , Shaw , R A , Mazzoleni , L R , Girotto , G , Sharma , N , Gorkowski , K , Gilardoni , S , Decesari , S , Facchini , M C , Zanca , N , Pavese , G , Esposito , F , Dubey , M K , Aiken , A C , Chakrabarty , R K , Moosmüller , H , Onasch , T B , Zaveri , R A , Scarnato , B , Fialho , P & Mazzoleni , C 2019 , ' Extensive Soot Compaction by Cloud Processing from Laboratory and Field Observations ' , Scientific Reports , vol. 9 , 11824 . https://doi.org/10.1038/s41598-019-48143-y

Title: Extensive Soot Compaction by Cloud Processing from Laboratory and Field Observations
Author: Bhandari, Janarjan; China, Swarup; Chandrakar, Kamal Kant; Kinney, Greg; Cantrell, Will; Shaw, Raymond A.; Mazzoleni, Lynn R.; Girotto, Giulia; Sharma, Noopur; Gorkowski, Kyle; Gilardoni, Stefania; Decesari, Stefano; Facchini, Maria Cristina; Zanca, Nicola; Pavese, Giulia; Esposito, Francesco; Dubey, Manvendra K.; Aiken, Allison C.; Chakrabarty, Rajan K.; Moosmüller, Hans; Onasch, Timothy B.; Zaveri, Rahul A.; Scarnato, Barbara; Fialho, Paulo; Mazzoleni, Claudio
Contributor: University of Helsinki, Department
Date: 2019-08-14
Language: eng
Number of pages: 12
Belongs to series: Scientific Reports
ISSN: 2045-2322
URI: http://hdl.handle.net/10138/305537
Abstract: Soot particles form during combustion of carbonaceous materials and impact climate and air quality. When freshly emitted, they are typically fractal-like aggregates. After atmospheric aging, they can act as cloud condensation nuclei, and water condensation or evaporation restructure them to more compact aggregates, affecting their optical, aerodynamic, and surface properties. Here we survey the morphology of ambient soot particles from various locations and different environmental and aging conditions. We used electron microscopy and show extensive soot compaction after cloud processing. We further performed laboratory experiments to simulate atmospheric cloud processing under controlled conditions. We find that soot particles sampled after evaporating the cloud droplets, are significantly more compact than freshly emitted and interstitial soot, confirming that cloud processing, not just exposure to high humidity, compacts soot. Our findings have implications for how the radiative, surface, and aerodynamic properties, and the fate of soot particles are represented in numerical models.
Subject: AEROSOL LIGHT-ABSORPTION
BLACK CARBON PARTICLES
MIXING STATE
DROPLET ACTIVATION
OPTICAL-PROPERTIES
FRACTAL DIMENSION
ORGANIC-COMPOUNDS
PART 1
MORPHOLOGY
SIZE
116 Chemical sciences
114 Physical sciences
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