2019
DOI: 10.5194/acp-19-12397-2019
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Photomineralization mechanism changes the ability of dissolved organic matter to activate cloud droplets and to nucleate ice crystals

Abstract: Abstract. An organic aerosol particle has a lifetime of approximately 1 week in the atmosphere during which it will be exposed to sunlight. However, the effect of photochemistry on the propensity of organic matter to participate in the initial cloud-forming steps is difficult to predict. In this study, we quantify on a molecular scale the effect of photochemical exposure of naturally occurring dissolved organic matter (DOM) and of a fulvic acid standard on its cloud condensation nuclei (CCN) and ice nucleation… Show more

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Cited by 36 publications
(95 citation statements)
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References 92 publications
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“…These results demonstrate a high stability of Fusarium IN under oxidizing and nitrating conditions. This is in contrast to other biological IN, e.g., bacterial IN (Snomax ® ) (Kunert et al, 2018), birch and alder pollen (Gute and Abbatt, 2018), and dissolved organic matter (Borduas-Dedekind et al, 2019), where exposure to oxidizing agents reduced the IN activity.…”
Section: Stability Of Fusarium Inmentioning
confidence: 76%
“…These results demonstrate a high stability of Fusarium IN under oxidizing and nitrating conditions. This is in contrast to other biological IN, e.g., bacterial IN (Snomax ® ) (Kunert et al, 2018), birch and alder pollen (Gute and Abbatt, 2018), and dissolved organic matter (Borduas-Dedekind et al, 2019), where exposure to oxidizing agents reduced the IN activity.…”
Section: Stability Of Fusarium Inmentioning
confidence: 76%
“…In addition, we recognize that realistic atmospheric aging is further complicated by other factors such as multiphase chemistry involving gas to particle partitioning and photochemical processes in the cloud water and/or aqueous aerosol phase, largely determining the aqueous chemistry of organic aqueous species, that can affect the aerosol aging 107,108 and associated ice nucleation properties. 109 The largest challenge remains to further disentangle the contribution of changes from the physical properties versus those from chemical properties of the soot particles upon different aging processes, and the degree of their contribution to the enhanced ice nucleation ability. Certainly, one caveat of our analysis is that upon nebulizing soot particles from the bulk solutions, the particles can change their morphology.…”
Section: Limitationsmentioning
confidence: 99%
“…Lignin is not the most active INM in the sea surface microlayer, in sea spray, or in bioaerosols (Steinke et al, 2019), and so we were therefore surprised to notice the similarity in slope. However, organic matter n m data from several other studies are inconsistent with this slope, highlighting the difficulties in predicting the ice nucleating ability of organic matter (Borduas-Dedekind et al, 2019;Pummer et al, 2015;O'Sullivan et al, 2014;McCluskey et al, 2017).…”
Section: Intercomparison Results and Lignin's In Parameterizationmentioning
confidence: 86%
“…Lignin could therefore be termed a nano-INP (O Sullivan et al, 2015), as an INM (Pummer et al, 2015) and operationally defined as soluble (Borduas-Dedekind et al, 2019). The ability of lignin to be chemically recalcitrant further demonstrates its value as a standard.…”
Section: Lignin's Macromolecular Size and Reactivitymentioning
confidence: 99%
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