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Title: Reconciling satellite aerosol optical thickness and surface fine particle mass through aerosol liquid water: ALW AND AOT

Abstract

Summertime aerosol optical thickness (AOT) over the Southeast U.S. is sharply enhanced over wintertime values. This seasonal pattern is unique and of particular interest because temperatures there have not warmed over the past 100 years. Patterns in surface fine particle mass are inconsistent with satellite reported AOT. In this work, we attempt to reconcile the spatial and temporal distribution of AOT over the U.S. with particle mass measurements at the surface by examining trends in aerosol liquid water (ALW), a particle constituent that scatters radiation affecting the satellite AOT, but is removed in mass measurements at routine surface monitoring sites. We employ the thermodynamic model ISORROPIAv2.1 to estimate ALW mass concentrations at IMRPOVE sites using measured ion mass concentrations and NARR meteorological data. Our findings suggest ALW provides a plausible explanation for the geographical and seasonal patterns in AOT and can reconcile previously noted discrepancies with surface mass measurements.

Authors:
 [1]; ORCiD logo [2]; ORCiD logo [3]
  1. Department of Environmental Sciences, Rutgers University, New Brunswick New Jersey USA
  2. Environmental Science Division, Argonne National Laboratory, Argonne Illinois USA
  3. Department of Chemistry, University of California, Irvine California USA
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science - Office of Biological and Environmental Research - Atmospheric System Research; USEPA; National Science Foundation (NSF)
OSTI Identifier:
1392096
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 43; Journal Issue: 22; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
IMPROVE; aerosol liquid water; aerosol optical thickness; hygroscopicity; organic aerosol; particulate matter

Citation Formats

Nguyen, Thien Khoi V., Ghate, Virendra P., and Carlton, Annmarie G. Reconciling satellite aerosol optical thickness and surface fine particle mass through aerosol liquid water: ALW AND AOT. United States: N. p., 2016. Web. doi:10.1002/2016GL070994.
Nguyen, Thien Khoi V., Ghate, Virendra P., & Carlton, Annmarie G. Reconciling satellite aerosol optical thickness and surface fine particle mass through aerosol liquid water: ALW AND AOT. United States. doi:10.1002/2016GL070994.
Nguyen, Thien Khoi V., Ghate, Virendra P., and Carlton, Annmarie G. Tue . "Reconciling satellite aerosol optical thickness and surface fine particle mass through aerosol liquid water: ALW AND AOT". United States. doi:10.1002/2016GL070994.
@article{osti_1392096,
title = {Reconciling satellite aerosol optical thickness and surface fine particle mass through aerosol liquid water: ALW AND AOT},
author = {Nguyen, Thien Khoi V. and Ghate, Virendra P. and Carlton, Annmarie G.},
abstractNote = {Summertime aerosol optical thickness (AOT) over the Southeast U.S. is sharply enhanced over wintertime values. This seasonal pattern is unique and of particular interest because temperatures there have not warmed over the past 100 years. Patterns in surface fine particle mass are inconsistent with satellite reported AOT. In this work, we attempt to reconcile the spatial and temporal distribution of AOT over the U.S. with particle mass measurements at the surface by examining trends in aerosol liquid water (ALW), a particle constituent that scatters radiation affecting the satellite AOT, but is removed in mass measurements at routine surface monitoring sites. We employ the thermodynamic model ISORROPIAv2.1 to estimate ALW mass concentrations at IMRPOVE sites using measured ion mass concentrations and NARR meteorological data. Our findings suggest ALW provides a plausible explanation for the geographical and seasonal patterns in AOT and can reconcile previously noted discrepancies with surface mass measurements.},
doi = {10.1002/2016GL070994},
journal = {Geophysical Research Letters},
issn = {0094-8276},
number = 22,
volume = 43,
place = {United States},
year = {2016},
month = {11}
}

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