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Title: Frequency and Character of Extreme Aerosol Events in the Southwestern United States: A Case Study Analysis in Arizona

Abstract

This study uses more than a decade's worth of data across Arizona to characterize the spatiotemporal distribution, frequency, and source of extreme aerosol events, defined as when the concentration of a species on a particular day exceeds that of the average plus two standard deviations for that given month. Depending on which of eight sites studied, between 5% and 7% of the total days exhibited an extreme aerosol event due to either extreme levels of PM10, PM2.5, and/or fine soil. Grand Canyon exhibited the most extreme event days (120, i.e., 7% of its total days). Fine soil is the pollutant type that most frequently impacted multiple sites at once at an extreme level. PM10, PM2.5, fine soil, non-Asian dust, and Elemental Carbon extreme events occurred most frequently in August. Nearly all Asian dust extreme events occurred between March and June. Extreme Elemental Carbon events have decreased as a function of time with statistical significance, while other pollutant categories did not show any significant change. Extreme events were most frequent for the various pollutant categories on either Wednesday or Thursday, but there was no statistically significant difference in the number of events on any particular day or on weekends versus weekdays.

Authors:
 [1];  [1];  [2];  [3];  [3];  [4]
  1. Univ. of Arizona, Tucson, AZ (United States). Department of Chemical and Environmental Engineering
  2. National Aeronautics and Space Administration Langley Research Center, Hampton, VA (United States). Chemistry and Dynamics Branch; Oak Ridge Associated Univ., Oak Ridge, TN (United States)
  3. Univ. of Arizona, Tucson, AZ (United States). Department of Hydrology and Atmospheric Sciences
  4. Univ. of Arizona, Tucson, AZ (United States). Department of Chemical and Environmental Engineering and Department of Hydrology and Atmospheric Sciences
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1480704
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Atmosphere (Basel)
Additional Journal Information:
Journal Name: Atmosphere (Basel); Journal Volume: 7; Journal Issue: 1; Journal ID: ISSN 2073-4433
Publisher:
MDPI
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; aerosol; dust; IMPROVE; Asian dust; Arizona; air quality; extreme events

Citation Formats

Lopez, David, Rabbani, Michael, Crosbie, Ewan, Raman, Aishwarya, Arellano, Avelino, and Sorooshian, Armin. Frequency and Character of Extreme Aerosol Events in the Southwestern United States: A Case Study Analysis in Arizona. United States: N. p., 2015. Web. doi:10.3390/atmos7010001.
Lopez, David, Rabbani, Michael, Crosbie, Ewan, Raman, Aishwarya, Arellano, Avelino, & Sorooshian, Armin. Frequency and Character of Extreme Aerosol Events in the Southwestern United States: A Case Study Analysis in Arizona. United States. doi:10.3390/atmos7010001.
Lopez, David, Rabbani, Michael, Crosbie, Ewan, Raman, Aishwarya, Arellano, Avelino, and Sorooshian, Armin. Wed . "Frequency and Character of Extreme Aerosol Events in the Southwestern United States: A Case Study Analysis in Arizona". United States. doi:10.3390/atmos7010001. https://www.osti.gov/servlets/purl/1480704.
@article{osti_1480704,
title = {Frequency and Character of Extreme Aerosol Events in the Southwestern United States: A Case Study Analysis in Arizona},
author = {Lopez, David and Rabbani, Michael and Crosbie, Ewan and Raman, Aishwarya and Arellano, Avelino and Sorooshian, Armin},
abstractNote = {This study uses more than a decade's worth of data across Arizona to characterize the spatiotemporal distribution, frequency, and source of extreme aerosol events, defined as when the concentration of a species on a particular day exceeds that of the average plus two standard deviations for that given month. Depending on which of eight sites studied, between 5% and 7% of the total days exhibited an extreme aerosol event due to either extreme levels of PM10, PM2.5, and/or fine soil. Grand Canyon exhibited the most extreme event days (120, i.e., 7% of its total days). Fine soil is the pollutant type that most frequently impacted multiple sites at once at an extreme level. PM10, PM2.5, fine soil, non-Asian dust, and Elemental Carbon extreme events occurred most frequently in August. Nearly all Asian dust extreme events occurred between March and June. Extreme Elemental Carbon events have decreased as a function of time with statistical significance, while other pollutant categories did not show any significant change. Extreme events were most frequent for the various pollutant categories on either Wednesday or Thursday, but there was no statistically significant difference in the number of events on any particular day or on weekends versus weekdays.},
doi = {10.3390/atmos7010001},
journal = {Atmosphere (Basel)},
number = 1,
volume = 7,
place = {United States},
year = {2015},
month = {12}
}

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