Pollen Emissions of Subpollen Particles and Ice Nucleating Particles

Brianna H. Matthews; Alyssa N. Alsante; Sarah D. Brooks

doi:10.1021/acsearthspacechem.3c00014

Pollen Emissions of Subpollen Particles and Ice Nucleating Particles

Brianna H. Matthews, Alyssa N. Alsante, Sarah D. Brooks

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

Pollen grains significantly contribute to the aerosol population, and levels are predicted to increase in the future. Under humid atmospheric conditions, pollen grains can rupture creating pollen grain fragments referred to as subpollen particles (SPPs) which are dispersed into the atmosphere with wind. In this laboratory study, SPP emission factors were determined for ryegrass, Lolium sp., and giant ragweed,Ambrosia trifida, in terms of the number of SPPs produced per pollen grain and the number of SPPs produced per m², which were compared to previously measured live oak,Quercus virginiana, emission factors. The SPP emission factors were 4.9 × 10¹³ ± 4.3 × 10¹³ SPPs per m² for ryegrass, 1.3 × 10¹⁵ ± 1.1 × 10¹⁵ SPPs per m² for giant ragweed, and 1.1 × 10¹⁵ ± 1.6 × 10¹⁵ SPPs per m² for live oak. SPPs and whole pollen grains from these species were evaluated for their ice nucleation efficiency in immersion and contact mode freezing. Measurements of the ice nucleation efficiency indicate that SPPs are weakly effective INPs in immersion mode, but that pollen grains represent a source of moderately efficient INPs in immersion and contact modes.

Original language	English
Pages (from-to)	1207-1218
Number of pages	12
Journal	ACS Earth and Space Chemistry
Volume	7
Issue number	6
DOIs	https://doi.org/10.1021/acsearthspacechem.3c00014
State	Published - Jun 15 2023
Externally published	Yes

Funding

The funding was provided by the National Science Foundation Collaborative Grant #AGS-1821095.

Keywords

emission factors
giant ragweed
ice nucleation
live oak
pollen
ryegrass
subpollen particles

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10.1021/acsearthspacechem.3c00014

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title = "Pollen Emissions of Subpollen Particles and Ice Nucleating Particles",

abstract = "Pollen grains significantly contribute to the aerosol population, and levels are predicted to increase in the future. Under humid atmospheric conditions, pollen grains can rupture creating pollen grain fragments referred to as subpollen particles (SPPs) which are dispersed into the atmosphere with wind. In this laboratory study, SPP emission factors were determined for ryegrass, Lolium sp., and giant ragweed,Ambrosia trifida, in terms of the number of SPPs produced per pollen grain and the number of SPPs produced per m2, which were compared to previously measured live oak,Quercus virginiana, emission factors. The SPP emission factors were 4.9 × 1013 ± 4.3 × 1013 SPPs per m2 for ryegrass, 1.3 × 1015 ± 1.1 × 1015 SPPs per m2 for giant ragweed, and 1.1 × 1015 ± 1.6 × 1015 SPPs per m2 for live oak. SPPs and whole pollen grains from these species were evaluated for their ice nucleation efficiency in immersion and contact mode freezing. Measurements of the ice nucleation efficiency indicate that SPPs are weakly effective INPs in immersion mode, but that pollen grains represent a source of moderately efficient INPs in immersion and contact modes.",

keywords = "emission factors, giant ragweed, ice nucleation, live oak, pollen, ryegrass, subpollen particles",

author = "Matthews, {Brianna H.} and Alsante, {Alyssa N.} and Brooks, {Sarah D.}",

note = "Publisher Copyright: {\textcopyright} 2023 American Chemical Society.",

year = "2023",

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doi = "10.1021/acsearthspacechem.3c00014",

language = "English",

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AU - Matthews, Brianna H.

AU - Alsante, Alyssa N.

AU - Brooks, Sarah D.

PY - 2023/6/15

Y1 - 2023/6/15

N2 - Pollen grains significantly contribute to the aerosol population, and levels are predicted to increase in the future. Under humid atmospheric conditions, pollen grains can rupture creating pollen grain fragments referred to as subpollen particles (SPPs) which are dispersed into the atmosphere with wind. In this laboratory study, SPP emission factors were determined for ryegrass, Lolium sp., and giant ragweed,Ambrosia trifida, in terms of the number of SPPs produced per pollen grain and the number of SPPs produced per m2, which were compared to previously measured live oak,Quercus virginiana, emission factors. The SPP emission factors were 4.9 × 1013 ± 4.3 × 1013 SPPs per m2 for ryegrass, 1.3 × 1015 ± 1.1 × 1015 SPPs per m2 for giant ragweed, and 1.1 × 1015 ± 1.6 × 1015 SPPs per m2 for live oak. SPPs and whole pollen grains from these species were evaluated for their ice nucleation efficiency in immersion and contact mode freezing. Measurements of the ice nucleation efficiency indicate that SPPs are weakly effective INPs in immersion mode, but that pollen grains represent a source of moderately efficient INPs in immersion and contact modes.

AB - Pollen grains significantly contribute to the aerosol population, and levels are predicted to increase in the future. Under humid atmospheric conditions, pollen grains can rupture creating pollen grain fragments referred to as subpollen particles (SPPs) which are dispersed into the atmosphere with wind. In this laboratory study, SPP emission factors were determined for ryegrass, Lolium sp., and giant ragweed,Ambrosia trifida, in terms of the number of SPPs produced per pollen grain and the number of SPPs produced per m2, which were compared to previously measured live oak,Quercus virginiana, emission factors. The SPP emission factors were 4.9 × 1013 ± 4.3 × 1013 SPPs per m2 for ryegrass, 1.3 × 1015 ± 1.1 × 1015 SPPs per m2 for giant ragweed, and 1.1 × 1015 ± 1.6 × 1015 SPPs per m2 for live oak. SPPs and whole pollen grains from these species were evaluated for their ice nucleation efficiency in immersion and contact mode freezing. Measurements of the ice nucleation efficiency indicate that SPPs are weakly effective INPs in immersion mode, but that pollen grains represent a source of moderately efficient INPs in immersion and contact modes.

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Pollen Emissions of Subpollen Particles and Ice Nucleating Particles

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