COMBLE ARM Mobile Facility (AMF) Measurements of Ice Nucleating Particles Field Campaign Report

DeMott, Paul J.; Pnnl, Bnl; Hill, T. C. J.

doi:10.2172/1767118

Cited by 7 publications

(9 citation statements)

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“…The predominance of biological INPs at temperatures above −20°C emphasizes the need for parameterization of this INP class, which should include their short‐term variation caused by precipitation (e.g., fit parameterization derived by Mignani et al., 2021) and high relative humidity. Work to investigate whether the concentrations, characteristics and dynamics of the surface‐level INPs are also applicable to observations at the altitude of clouds is ongoing (DeMott & Hill, 2020; Varble et al., 2021).…”

Section: Discussionmentioning

confidence: 99%

Ice Nucleating Particle Connections to Regional Argentinian Land Surface Emissions and Weather During the Cloud, Aerosol, and Complex Terrain Interactions Experiment

et al. 2021

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Here, we present a multi‐season study of ice‐nucleating particles (INPs) active via the immersion freezing mechanism, which took place in north‐central Argentina, a worldwide hotspot for mesoscale convective storms. INPs were measured untreated, after heating to 95°C, and after hydrogen peroxide digestion. No seasonal cycle of INP concentrations was observed. Heat labile INPs, which we define as “biological” herein, dominated the population active at −5 to −20°C, while non‐heat‐labile organic INPs (decomposed by peroxide) dominated at lower temperatures, from −20 to −28°C. Inorganic INPs (remaining after peroxide digestion), were minor contributors to the overall INP activity. Biological INP concentration active around −12°C peaked during rain events and under high relative humidity, reflecting emission mechanisms independent of the background aerosol concentration. The ratio of non‐heat‐labile organic and inorganic INPs was generally constant, suggesting they originated from the same source, presumably from regional arable topsoil based on air mass histories. Single particle mass spectrometry showed that soil particles aerosolized from a regionally common agricultural topsoil contained known mineral INP sources (K‐feldspar and illite) as well as a significant organic component. The INP activity observed in this study correlates well with agricultural soil INP activities from this and other regions of the world, suggesting that the observed INP spectra might be typical of many arable landscapes. These results demonstrate the strong influence of regional continental landscapes, emitting INPs of types that are not yet well represented in global models.

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Section: Discussionmentioning

confidence: 99%

Ice Nucleating Particle Connections to Regional Argentinian Land Surface Emissions and Weather During the Cloud, Aerosol, and Complex Terrain Interactions Experiment

et al. 2021

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“…The predominance of biological INPs at temperatures above −20°C emphasizes the need for parameterization of this INP class, which should include their short-term variation caused by precipitation (e.g., fit parameterization derived by Mignani et al, 2021) and high relative humidity. Work to investigate whether the concentrations, characteristics and dynamics of the surface-level INPs are also applicable to observations at the altitude of clouds is ongoing (DeMott & Hill, 2020;Varble et al, 2021).…”

Section: Discussionmentioning

confidence: 99%

Ice nucleating particle connections to regional Argentinian land surface emissions and weather during the Cloud, Aerosol, and Complex Terrain Interactions experiment

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Hill

Marsden

et al. 2021

Preprint

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“…Number concentrations of immersion freezing INPs ( n INPs ) were measured during the MARCUS and SOCRATES studies using the Colorado State University (CSU) ice spectrometer (IS, Barry, Hill, Jentzsch, et al., 2021; P. J. DeMott, 2018; P. J. DeMott et al., 2018). During MARCUS, total suspended ambient particles were collected onto filters in open‐faced filter holders that were approximately 18 m above the ocean surface (Table 1).…”

Section: Methodsmentioning

confidence: 99%

Simulating Southern Ocean Aerosol and Ice Nucleating Particles in the Community Earth System Model Version 2

et al. 2023

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Southern Ocean (SO) low‐level mixed phase clouds have been a long‐standing challenge for Earth system models to accurately represent. While improvements to the Community Earth System Model version 2 (CESM2) resulted in increased supercooled liquid in SO clouds and improved model radiative biases, simulated SO clouds in CESM2 now contain too little ice. Previous observational studies have indicated that marine particles are major contributor to SO low‐level cloud heterogeneous ice nucleation, a process that initiates a number of cloud processes that govern cloud radiative properties. In this study, we utilize detailed aerosol and ice nucleating particle (INP) measurements from two recent measurement campaigns to assess simulated aerosol abundance, number size distributions, and composition and INP parameterizations for use in CESM2. Our results indicate that CESM2 has a positive bias in simulated surface‐level total aerosol surface area at latitudes north of 58°S. Measured INP populations were dominated by marine INPs and we present evidence of refractory INPs present over the SO assumed here to be mineral dust INPs. Results highlight a critical need to assess simulated mineral dust number and size distributions in CESM2 in order to adequately represent SO INP populations and their response to long‐term changes in atmospheric transport patterns and land use change. We also discuss important cautions and limitations in applying a commonly used mineral dust INP parameterization to remote regions like the pristine SO.

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COMBLE ARM Mobile Facility (AMF) Measurements of Ice Nucleating Particles Field Campaign Report

Cited by 7 publications

References 0 publications

Ice Nucleating Particle Connections to Regional Argentinian Land Surface Emissions and Weather During the Cloud, Aerosol, and Complex Terrain Interactions Experiment

Ice Nucleating Particle Connections to Regional Argentinian Land Surface Emissions and Weather During the Cloud, Aerosol, and Complex Terrain Interactions Experiment

Ice nucleating particle connections to regional Argentinian land surface emissions and weather during the Cloud, Aerosol, and Complex Terrain Interactions experiment

Simulating Southern Ocean Aerosol and Ice Nucleating Particles in the Community Earth System Model Version 2

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