The influence of size-dependent droplet composition on pollutant processing by fogs

K. M. Fahey; S. N. Pandis; J. L. Collett; P. Herckes

doi:10.1016/j.atmosenv.2005.04.006

The influence of size-dependent droplet composition on pollutant processing by fogs

K. M. Fahey, S. N. Pandis, J. L. Collett, P. Herckes

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

44 Scopus citations

Abstract

The effects of size-dependent fog chemistry and physics on the pre-fog aerosol size/composition distribution are examined for a San Joaquin Valley fog. In this paper, we compare the results of a size-resolved fog model with measurements from Colorado State University's five-stage and bulk cloud collectors. The model reproduces the amounts and trends of the observed bulk fog water concentrations and size-dependent composition of the major species (sulfate, ammonium, nitrate, sodium, chloride, calcium). We examine the size-dependent evolution of the measured species and compare sulfate concentrations predicted by the highly size-resolved fog model with the variable size resolution model (VSRM) [Fahey and Pandis, 2001. Atmospheric Environment 35, 4471-4478]. It is shown that for lengthy fog events in relatively clean environments deposition of fog droplets is the most important process for the evolution of the size/composition distribution of aerosols over the course of fog processing. The results indicate a need for a larger number of measurements of deposition fluxes for individual species and the need for aqueous-phase concentration measurements from the early formation stage of fogs.

Original language	English (US)
Pages (from-to)	4561-4574
Number of pages	14
Journal	Atmospheric Environment
Volume	39
Issue number	25
DOIs	https://doi.org/10.1016/j.atmosenv.2005.04.006
State	Published - Aug 2005
Externally published	Yes

Keywords

Fog chemistry
SO oxidation
San Joaquin Valley
Sulfate
VSRM

ASJC Scopus subject areas

General Environmental Science
Atmospheric Science

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10.1016/j.atmosenv.2005.04.006

Cite this

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title = "The influence of size-dependent droplet composition on pollutant processing by fogs",

abstract = "The effects of size-dependent fog chemistry and physics on the pre-fog aerosol size/composition distribution are examined for a San Joaquin Valley fog. In this paper, we compare the results of a size-resolved fog model with measurements from Colorado State University's five-stage and bulk cloud collectors. The model reproduces the amounts and trends of the observed bulk fog water concentrations and size-dependent composition of the major species (sulfate, ammonium, nitrate, sodium, chloride, calcium). We examine the size-dependent evolution of the measured species and compare sulfate concentrations predicted by the highly size-resolved fog model with the variable size resolution model (VSRM) [Fahey and Pandis, 2001. Atmospheric Environment 35, 4471-4478]. It is shown that for lengthy fog events in relatively clean environments deposition of fog droplets is the most important process for the evolution of the size/composition distribution of aerosols over the course of fog processing. The results indicate a need for a larger number of measurements of deposition fluxes for individual species and the need for aqueous-phase concentration measurements from the early formation stage of fogs.",

keywords = "Fog chemistry, SO oxidation, San Joaquin Valley, Sulfate, VSRM",

author = "Fahey, {K. M.} and Pandis, {S. N.} and Collett, {J. L.} and P. Herckes",

note = "Funding Information: This work was funded by the National Science Foundation (ATM-0336296 and ATM-9980540) and the San Joaquin Valleywide Air Pollution Study Agency. The statements and conclusions in this report are those of the Contractor and not necessarily those of the California Air Resources Board, the San Joaquin Valleywide Air Pollution Study Agency, or its Policy Committee, their employees or their members. The mention of commercial products, their source, or their use in connection with material reported herein is not to be construed as actual or implied endorsement of such products. We are grateful to T. Lee, J. Reilly, H. Chang, G. Kang and S. Emert for assistance during the field experiment. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.",

year = "2005",

month = aug,

doi = "10.1016/j.atmosenv.2005.04.006",

language = "English (US)",

volume = "39",

pages = "4561--4574",

journal = "Atmospheric Environment",

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AU - Pandis, S. N.

AU - Collett, J. L.

AU - Herckes, P.

N1 - Funding Information: This work was funded by the National Science Foundation (ATM-0336296 and ATM-9980540) and the San Joaquin Valleywide Air Pollution Study Agency. The statements and conclusions in this report are those of the Contractor and not necessarily those of the California Air Resources Board, the San Joaquin Valleywide Air Pollution Study Agency, or its Policy Committee, their employees or their members. The mention of commercial products, their source, or their use in connection with material reported herein is not to be construed as actual or implied endorsement of such products. We are grateful to T. Lee, J. Reilly, H. Chang, G. Kang and S. Emert for assistance during the field experiment. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.

PY - 2005/8

Y1 - 2005/8

N2 - The effects of size-dependent fog chemistry and physics on the pre-fog aerosol size/composition distribution are examined for a San Joaquin Valley fog. In this paper, we compare the results of a size-resolved fog model with measurements from Colorado State University's five-stage and bulk cloud collectors. The model reproduces the amounts and trends of the observed bulk fog water concentrations and size-dependent composition of the major species (sulfate, ammonium, nitrate, sodium, chloride, calcium). We examine the size-dependent evolution of the measured species and compare sulfate concentrations predicted by the highly size-resolved fog model with the variable size resolution model (VSRM) [Fahey and Pandis, 2001. Atmospheric Environment 35, 4471-4478]. It is shown that for lengthy fog events in relatively clean environments deposition of fog droplets is the most important process for the evolution of the size/composition distribution of aerosols over the course of fog processing. The results indicate a need for a larger number of measurements of deposition fluxes for individual species and the need for aqueous-phase concentration measurements from the early formation stage of fogs.

AB - The effects of size-dependent fog chemistry and physics on the pre-fog aerosol size/composition distribution are examined for a San Joaquin Valley fog. In this paper, we compare the results of a size-resolved fog model with measurements from Colorado State University's five-stage and bulk cloud collectors. The model reproduces the amounts and trends of the observed bulk fog water concentrations and size-dependent composition of the major species (sulfate, ammonium, nitrate, sodium, chloride, calcium). We examine the size-dependent evolution of the measured species and compare sulfate concentrations predicted by the highly size-resolved fog model with the variable size resolution model (VSRM) [Fahey and Pandis, 2001. Atmospheric Environment 35, 4471-4478]. It is shown that for lengthy fog events in relatively clean environments deposition of fog droplets is the most important process for the evolution of the size/composition distribution of aerosols over the course of fog processing. The results indicate a need for a larger number of measurements of deposition fluxes for individual species and the need for aqueous-phase concentration measurements from the early formation stage of fogs.

KW - Fog chemistry

KW - SO oxidation

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The influence of size-dependent droplet composition on pollutant processing by fogs

Abstract

Keywords

ASJC Scopus subject areas

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