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Title: Revisiting particle dry deposition and its role in radiative effect estimates

Abstract

Wet and dry deposition remove aerosols from the atmosphere, and these processes control aerosol lifetime and thus impact climate and air quality. Dry deposition is a significant source of aerosol uncertainty in global chemical transport and climate models. Dry deposition parameterizations in most global models were developed when few particle deposition measurements were available. However, new measurement techniques have enabled more size-resolved particle flux observations. We combined literature measurements with data that we collected over a grassland in Oklahoma and a pine forest in Colorado to develop a dry deposition parameterization. We find that relative to observations, previous parameterizations overestimated deposition of the accumulation and Aitken mode particles, and underestimated in the coarse mode. These systematic differences in observed and modeled accumulation mode particle deposition velocities are as large as an order of magnitude over terrestrial ecosystems. As accumulation mode particles form most of the cloud condensation nuclei (CCN) that influence the indirect radiative effect, this model-measurement discrepancy in dry deposition alters modeled CCN and radiative forcing. We present a revised observationally driven parameterization for regional and global aerosol models. Using this revised dry deposition scheme in the Goddard Earth Observing System (GEOS)-Chem chemical transport model, we find that globalmore » surface accumulation-mode number concentrations increase by 62% and enhance the global combined anthropogenic and natural aerosol indirect effect by −0.63 W m −2 . Our observationally constrained approach should reduce the uncertainty of particle dry deposition in global chemical transport models.« less

Authors:
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Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1670471
Grant/Contract Number:  
DE‐SC0016259; SC0019000
Resource Type:
Published Article
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Name: Proceedings of the National Academy of Sciences of the United States of America; Journal ID: ISSN 0027-8424
Publisher:
Proceedings of the National Academy of Sciences
Country of Publication:
United States
Language:
English

Citation Formats

Emerson, Ethan W., Hodshire, Anna L., DeBolt, Holly M., Bilsback, Kelsey R., Pierce, Jeffrey R., McMeeking, Gavin R., and Farmer, Delphine K. Revisiting particle dry deposition and its role in radiative effect estimates. United States: N. p., 2020. Web. doi:10.1073/pnas.2014761117.
Emerson, Ethan W., Hodshire, Anna L., DeBolt, Holly M., Bilsback, Kelsey R., Pierce, Jeffrey R., McMeeking, Gavin R., & Farmer, Delphine K. Revisiting particle dry deposition and its role in radiative effect estimates. United States. doi:10.1073/pnas.2014761117.
Emerson, Ethan W., Hodshire, Anna L., DeBolt, Holly M., Bilsback, Kelsey R., Pierce, Jeffrey R., McMeeking, Gavin R., and Farmer, Delphine K. Mon . "Revisiting particle dry deposition and its role in radiative effect estimates". United States. doi:10.1073/pnas.2014761117.
@article{osti_1670471,
title = {Revisiting particle dry deposition and its role in radiative effect estimates},
author = {Emerson, Ethan W. and Hodshire, Anna L. and DeBolt, Holly M. and Bilsback, Kelsey R. and Pierce, Jeffrey R. and McMeeking, Gavin R. and Farmer, Delphine K.},
abstractNote = {Wet and dry deposition remove aerosols from the atmosphere, and these processes control aerosol lifetime and thus impact climate and air quality. Dry deposition is a significant source of aerosol uncertainty in global chemical transport and climate models. Dry deposition parameterizations in most global models were developed when few particle deposition measurements were available. However, new measurement techniques have enabled more size-resolved particle flux observations. We combined literature measurements with data that we collected over a grassland in Oklahoma and a pine forest in Colorado to develop a dry deposition parameterization. We find that relative to observations, previous parameterizations overestimated deposition of the accumulation and Aitken mode particles, and underestimated in the coarse mode. These systematic differences in observed and modeled accumulation mode particle deposition velocities are as large as an order of magnitude over terrestrial ecosystems. As accumulation mode particles form most of the cloud condensation nuclei (CCN) that influence the indirect radiative effect, this model-measurement discrepancy in dry deposition alters modeled CCN and radiative forcing. We present a revised observationally driven parameterization for regional and global aerosol models. Using this revised dry deposition scheme in the Goddard Earth Observing System (GEOS)-Chem chemical transport model, we find that global surface accumulation-mode number concentrations increase by 62% and enhance the global combined anthropogenic and natural aerosol indirect effect by −0.63 W m −2 . Our observationally constrained approach should reduce the uncertainty of particle dry deposition in global chemical transport models.},
doi = {10.1073/pnas.2014761117},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = ,
volume = ,
place = {United States},
year = {2020},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
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DOI: 10.1073/pnas.2014761117

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