Ice nucleating particles in the Canadian High Arctic during the fall of 2018

Yun, Jingwei; Evoy, Erin; Worthy, Soleil; Fraser, Melody; Veber, Daniel; Rawlings, Kevin; Platt, Andrew W.G.; Sharma, Sangeeta; Leaitch, W. R.; Bertram, Allan K.

doi:10.1039/d1ea00068c

Cited by 9 publications

(5 citation statements)

References 79 publications

(230 reference statements)

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“…The association between ARs and p‐AARs could be used to understand both how aerosols modify cloud properties and for understanding aerosol wet deposition. BC and DU aerosols are important species when it comes to liquid and mixed‐phase clouds, as BC can act as CCN (Quinn et al., 2011; Zieger et al., 2023) and DU can act as INP (Irish et al., 2019; Kawai et al., 2023; Yun et al., 2022). Therefore, when ARs and p‐AARs are combined, cloud properties could be different compared to AR‐only cases, with impacts on cloud albedo and/or precipitation timing.…”

Section: Potential Applications Of P‐aarsmentioning

confidence: 99%

Polar Aerosol Atmospheric Rivers: Detection, Characteristics, and Potential Applications

Lapere,

Thomas,

Favier

et al. 2024

JGR Atmospheres

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Aerosols play a key role in polar climate, and are affected by long‐range transport from the mid‐latitudes, both in the Arctic and Antarctic. This work investigates poleward extreme transport events of aerosols, referred to as polar aerosol atmospheric rivers (p‐AAR), leveraging the concept of atmospheric rivers (AR) which signal extreme transport of moisture. Using reanalysis data, we build a detection catalog of p‐AARs for black carbon, dust, sea salt and organic carbon aerosols, for the period 1980–2022. First, we describe the detection algorithm, discuss its sensitivity, and evaluate its validity. Then, we present several extreme transport case studies, in the Arctic and in the Antarctic, illustrating the complementarity between ARs and p‐AARs. Despite similarities in transport pathways during co‐occurring AR/p‐AAR events, vertical profiles differ depending on the species, and large‐scale transport patterns show that moisture and aerosols do not necessarily originate from the same areas. The complementarity between AR and p‐AAR is also evidenced by their long‐term characteristics in terms of spatial distribution, seasonality and trends. p‐AAR detection, as a complement to AR, can have several important applications for better understanding polar climate and its connections to the mid‐latitudes.

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Section: Potential Applications Of P‐aarsmentioning

confidence: 99%

Polar Aerosol Atmospheric Rivers: Detection, Characteristics, and Potential Applications

Lapere,

Thomas,

Favier

et al. 2024

JGR Atmospheres

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“…A droplet freezing technique similar to Whale et al (2015) was used to determine the freezing temperature spectrum of aqueous suspensions. We have previously used this technique to study the ice-nucleating properties of inorganic, organic, and environmental INS samples (Irish et al 2019;Worthy et al 2021;Xi et al 2021;Yun et al 2020;Yun et al 2022). Hydrophobic glass slides (Hampton Research HR3-239) were rinsed with ultrapure water, dried with nitrogen gas, and placed on a cold stage (Grant Asymptote EF600 cryocooler).…”

Section: Droplet-freezing Experimentsmentioning

confidence: 99%

A method for separating and quantifying organic and inorganic ice nucleating substances in atmospheric samples based on density gradient centrifugation

Worthy,

Chen,

Uppal

et al. 2024

Preprint

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Ice nucleating substances (INSs) influence the properties and frequencies of ice and mixed-phase clouds in the atmosphere, and hence, climate and the hydrological cycle. INSs can be classified as inorganic (e.g., mineral dust, volcanic ash) or organic (e.g., bacterial cells, cell-free proteins). While the properties of both INS classes have been studied in the laboratory, the amounts in the atmosphere are still poorly constrained. Here, we demonstrate a new method for separating and quantifying inorganic and organic INSs. First, INS suspensions were separated into a high-density isolate containing inorganic INSs and a low-density isolate containing organic INSs using density gradient centrifugation, and then INSs were quantified in each isolate using a droplet freezing technique. Inorganic K-feldspar and organic Snomax INSs were used to test our method. The average K-feldspar INS recovery in the high-density isolate was 54%, with no evidence of K-feldspar INSs in the low-density isolate. The average Snomax INS recovery in the low-density isolate was 27%, with small amounts of Snomax contaminating the high-density isolate. A mixture of K-feldspar and Snomax was successfully separated, with recoveries comparable to those observed for K-feldspar and Snomax individually. Recoveries less than 100% can be explained by losses of INSs to vessel walls, accidental mixing of the different density layers during pipetting, and incomplete collection of material during pipetting.

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“…Recent studies have suggested the importance of Arctic dust as INPs under conditions relevant for the formation of mixed‐phase clouds (Sanchez‐Marroquin et al., 2020; Tobo et al., 2019; Xi et al., 2022; Yun et al., 2022). Tobo et al.…”

Section: Introductionmentioning

confidence: 99%

“…Recent studies have suggested the importance of Arctic dust as INPs under conditions relevant for the formation of mixed-phase clouds (Sanchez-Marroquin et al, 2020;Tobo et al, 2019;Xi et al, 2022;Yun et al, 2022). Tobo et al (2019) showed that Arctic dust collected from the surface of a glacial outwash plain in the Svalbard Islands has a remarkably high ice nucleating ability, especially at high temperatures (>−20°C), and suggested that this high ice nucleating ability is caused by the presence of certain organic matter contained in the dust.…”

mentioning

confidence: 99%

Dominant Role of Arctic Dust With High Ice Nucleating Ability in the Arctic Lower Troposphere

Kawai

Matsui

Tobo

2023

Geophysical Research Letters

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Recent observations show that dust emitted within the Arctic (Arctic dust) has a remarkably high ice nucleating ability, especially between −20°C and −5°C, but its impacts on the number concentrations of ice nucleating particles (INPs) and radiative balance in the Arctic are not well understood. Here we incorporate an observation‐based ice‐nucleation parameterization indicating the high ice nucleating ability of Arctic dust into a global aerosol‐climate model. A simulation using this parameterization better reproduces INP observations in the Arctic and estimates >100 times higher dust INP number concentrations with ∼100% contribution from Arctic dust in the Arctic lower troposphere (>60°N and >700 hPa) during summer and fall (June–November) than a simulation applying a standard ice‐nucleation parameterization suitable for desert dust to Arctic dust. Our results demonstrate the importance of considering an ice‐nucleation parameterization suitable for Arctic dust when simulating INPs and their effects on aerosol‐cloud interactions in the Arctic.

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Ice nucleating particles in the Canadian High Arctic during the fall of 2018

Abstract: Ice nucleating particles (INPs) are a small subset of atmospheric particles that can initiate the formation of ice in mixed-phase clouds. Here we report concentrations of INPs during October and...

Cited by 9 publications

References 79 publications

Polar Aerosol Atmospheric Rivers: Detection, Characteristics, and Potential Applications

Polar Aerosol Atmospheric Rivers: Detection, Characteristics, and Potential Applications

A method for separating and quantifying organic and inorganic ice nucleating substances in atmospheric samples based on density gradient centrifugation

Dominant Role of Arctic Dust With High Ice Nucleating Ability in the Arctic Lower Troposphere

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