A multi-year aerosol characterization for the greater tehran area using satellite, surface, and modeling data

Ewan Crosbie, Armin Sorooshian, Negar Abolhassani Monfared, Taylor Shingler, Omid Esmaili

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

This study reports a multi-year (2000-2009) aerosol characterization for metropolitan Tehran and surrounding areas using multiple datasets (Moderate Resolution Imaging Spectroradiometer (MODIS), Multi-angle Imaging Spectroradiometer (MISR), Total Ozone Mapping Spectrometer (TOMS), Goddard Ozone Chemistry Aerosol Radiation and Transport (GOCART), and surface and upper air data from local stations). Monthly trends in aerosol characteristics are examined in the context of the local meteorology, regional and local emission sources, and air mass back-trajectory data. Dust strongly affects the region during the late spring and summer months (May-August) when aerosol optical depth (AOD) is at its peak and precipitation accumulation is at a minimum. In addition, the peak AOD that occurs in July is further enhanced by a substantial number of seasonal wildfires in upwind regions. Conversely, AOD is at a minimum during winter; however, reduced mixing heights and a stagnant lower atmosphere trap local aerosol emissions near the surface and lead to significant reductions in visibility within Tehran. The unique meteorology and topographic setting makes wintertime visibility and surface aerosol concentrations particularly sensitive to local anthropogenic sources and is evident in the noteworthy improvement in visibility observed on weekends. Scavenging of aerosol due to precipitation is evident during the winter when a OPEN ACCESS consistent increase in surface visibility and concurrent decrease in AOD is observed in the days after rain compared with the days immediately before rain.

Original languageEnglish (US)
Pages (from-to)178-197
Number of pages20
JournalATMOSPHERE
Volume5
Issue number2
DOIs
StatePublished - 2014

Fingerprint

aerosol
modeling
visibility
optical depth
meteorology
MISR
TOMS
winter
anthropogenic source
wildfire
air mass
MODIS
trajectory
ozone
dust
atmosphere
air
summer

Keywords

  • Aerosol
  • Iran
  • MISR
  • MODIS
  • Visibility
  • Wet scavenging

ASJC Scopus subject areas

  • Environmental Science (miscellaneous)
  • Atmospheric Science

Cite this

A multi-year aerosol characterization for the greater tehran area using satellite, surface, and modeling data. / Crosbie, Ewan; Sorooshian, Armin; Monfared, Negar Abolhassani; Shingler, Taylor; Esmaili, Omid.

In: ATMOSPHERE, Vol. 5, No. 2, 2014, p. 178-197.

Research output: Contribution to journalArticle

Crosbie, Ewan ; Sorooshian, Armin ; Monfared, Negar Abolhassani ; Shingler, Taylor ; Esmaili, Omid. / A multi-year aerosol characterization for the greater tehran area using satellite, surface, and modeling data. In: ATMOSPHERE. 2014 ; Vol. 5, No. 2. pp. 178-197.
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