Oxidative Processing Lowers the Ice Nucleation Activity of Birch and Alder Pollen

Gute, Ellen; Abbatt, Jonathan P. D.

doi:10.1002/2017gl076357

Cited by 28 publications

(24 citation statements)

References 47 publications

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“…In fact, atmospheric photochemical processing of organic aerosols has been shown to increase CCN ability (Slade et al, 2017;Wong et al, 2011). However, the effect of photochemical processing of organic matter on ice nucleation is unknown, although recent work on pollen in deposition freezing mode suggests a decrease in ice activity (Gute and Abbatt, 2018). Our study links a photochemical mechanism with CCN and with INP efficiencies applicable for an atmospheric organic aerosol.…”

Section: Introductionmentioning

confidence: 64%

Photomineralization mechanism changes the ability of dissolved organic matter to activate cloud droplets and to nucleate ice crystals

Borduas-Dedekind¹,

Ossola²,

David³

et al. 2019

Preprint

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Abstract. An organic aerosol particle has a lifetime of approximately one week in the atmosphere during which it will be exposed to sunlight. Yet, 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 ability to form mixed-phase clouds, by acting as cloud condensation nuclei (CCN) and by acting as ice nucleating particles (INPs). We find that photochemical processing, equivalent to 4.6 days in the atmosphere, of DOM increases its ability to form cloud droplets by up to a factor of 2.5 but decreases its ability to form ice crystals at a loss rate of &#8722;0.04&#176;CT50 h&#8722;1 of sunlight at ground level. In other words, the ice nucleation activity of photooxidized DOM can require up to 4 degrees colder temperatures for 50&#8201;% of the droplets to activate as ice crystals under immersion freezing conditions. This temperature change could impact the ratio of ice to water droplets within a mixed phase cloud by delaying the onset of glaciation and by increasing the supercooled liquid fraction of the cloud, thereby modifying the radiative properties and the lifetime of the cloud. Concurrently, a photomineralization mechanism was quantified by monitoring the loss of organic carbon and the simultaneous production of organic acids, such as formic, acetic, oxalic and pyruvic acids, CO and CO2. This mechanism explains and predicts the observed increase in CCN and decrease in INP efficiencies. Indeed, we show that photochemical processing can be a dominant atmospheric aging process, impacting CCN and INP efficiencies and concentrations. Photomineralization can thus alter the aerosol-cloud radiative effects of organic matter by modifying the supercooled liquid water-to-ice crystal ratio in mixed-phase clouds with implications for cloud lifetime, precipitation patterns and the hydrological cycle.

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Section: Introductionmentioning

confidence: 64%

Photomineralization mechanism changes the ability of dissolved organic matter to activate cloud droplets and to nucleate ice crystals

Borduas-Dedekind¹,

Ossola²,

David³

et al. 2019

Preprint

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“…Amato et al (2015) show that typical IN active bacteria retain their activity on time scales characteristic for the transport between the source and the cloud. Gute and Abbatt (2018) report no effect on IN activity due to UV or sunlight exposure; however, for deposition freezing mode they found that chemical in-cloud oxidation lowers the IN activity of pollen but not of mineral dust.…”

Section: Atmospheric and Postdepositional Alteration Of Inpmentioning

confidence: 92%

Variation of Ice Nucleating Particles in the European Arctic Over the Last Centuries

Hartmann

Blunier

Brügger

et al. 2019

Geophysical Research Letters

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The historical development of ice nucleating particle concentrations (NINP) is still unknown. Here, we present for the first time NINP from the past 500 years at two Arctic sites derived from ice core samples. The samples originate from the EUROCORE ice core (Summit, Central Greenland) and from the Lomo09 ice core (Lomonosovfonna, Svalbard). No long‐term trend is obvious in the measured samples, and the overall range of NINP is comparable to present‐day observations. We observe that the short‐term variations in NINP is larger than the long‐term variability, but neither anthropogenic pollution nor volcanic eruptions seem to have influenced NINP in the measured temperature range. Shape and onset temperature of several INP spectra suggest that INP of biogenic origin contributed to the Arctic INP population throughout the past.

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“…The geographical dispersion of anemophilous plants largely relies on pollen dispersal, which in turn depends on the emission, transport and deposition of pollen grains; therefore, pollen plays a key role in the evolution of many ecosystems (Womack et al, 2010;Fröhlich-Nowoisky et al, 2016). In addition, PBAPs can serve as giant cloud condensation nuclei (CCN) and ice nucleating particles (INPs), significantly impacting the formation and properties of clouds and thus radiative balance and precipitation (Möhler et al, 2007;Ariya et al, 2009;Pratt et al, 2009;Pope, 2010;Pummer et al, 2012; Gute and Abbatt, 2018). It has also been proposed that PBAPs may have significant impacts on chemical composition of aerosol particles via heterogeneous and multiphase chemistry (Deguillaume et al, 2008;Estillore et al, 2016;Reinmuth-Selzle et al, 2017;Shiraiwa et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Water adsorption and hygroscopic growth of six anemophilous pollen species: the effect of temperature

Tang¹,

Gu²,

Ma³

et al. 2018

Preprint

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Abstract. Hygroscopicity largely affects environmental and climatic impacts of pollen grains, one important type of primary biological aerosol particles in the troposphere. However, our knowledge in pollen hygroscopicity is rather limited, and especially the effect of temperature has rarely been explored before. In this work three different techniques, including a vapor sorption analyzer, diffusion reflectance infrared Fourier transform spectroscopy (DRIFTS) and transmission Fourier transform infrared spectroscopy (transmission FTIR) were employed to characterize six anemophilous pollen species and to investigate their hygroscopic properties as a function of relative humidity (RH, up to 95&#8201;%) and temperature (5 or 15, 25 and 37&#8201;&#176;C). Substantial mass increase due to water uptake was observed for all the six pollen species, and at 25&#8201;&#176;C the relative mass increase at 90&#8201;% RH, when compared to that at <&#8201;1&#8201;% RH, ranged from ~&#8201;30 to ~&#8201;50&#8201;%, varying with pollen species. The modified &#954;-K&#246;hler theory can well approximate the mass hygroscopic growth of all the six pollen species, and the single hygroscopicity parameter (&#954;) was determined to be in the range of 0.034&#8201;&#177;&#8201;0.001 to 0.061&#8201;&#177;&#8201;0.007 at 25&#8201;&#176;C. In-situ DRIFTS measurements suggested that water adsorption by pollen species was mainly contributed by OH groups of organic compounds they contained. Good correlations were indeed found between hygroscopicity of pollen grains and the amount of OH groups, as determined using transmission FTIR. Increase in temperature would in general lead to decrease in hygroscopicity, except for pecan pollen. For example, &#954; values decreased from 0.073&#8201;&#177;&#8201;0.006 at 5&#8201;&#176;C to 0.061&#8201;&#177;&#8201;0.007 at 25&#8201;&#176;C and to 0.057&#8201;&#177;&#8201;0.004 at 37&#8201;&#176;C for populus tremuloides pollen, and decreased from 0.060&#8201;&#177;&#8201;0.001 at 15&#8201;&#176;C to 0.054&#8201;&#177;&#8201;0.001 at 25&#8201;&#176;C to 0.050&#8201;&#177;&#8201;0.002 at 37&#8201;&#176;C for paper mulberry pollen.

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Oxidative Processing Lowers the Ice Nucleation Activity of Birch and Alder Pollen

Cited by 28 publications

References 47 publications

Photomineralization mechanism changes the ability of dissolved organic matter to activate cloud droplets and to nucleate ice crystals

Photomineralization mechanism changes the ability of dissolved organic matter to activate cloud droplets and to nucleate ice crystals

Variation of Ice Nucleating Particles in the European Arctic Over the Last Centuries

Water adsorption and hygroscopic growth of six anemophilous pollen species: the effect of temperature

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