Climatology of atmospheric circulation patterns of Arabian dust in western Iran

Being in vicinity of vast deserts, the west and southwest of Iran are characterized by high levels of dust events, which have adverse consequences on human health, ecosystems, and environment. Using ground based dataset of dust events in western Iran and NCEP/NCAR reanalysis data, the atmospheric ci...

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Bibliographic Details
Published in:Environmental monitoring and assessment 2017-09, Vol.189 (9), p.473-473, Article 473
Main Authors: Najafi, Mohammad Saeed, Sarraf, B. S., Zarrin, A., Rasouli, A. A.
Format: Article
Language:English
Subjects:
Air Pollutants - analysis
Airborne particulates
Anticyclones
Atmospheric circulation
Atmospheric circulation patterns
Atmospheric particulates
Atmospheric Protection/Air Quality Control/Air Pollution
Blocking patterns
Circulation
Circulation patterns
Climatology
Cyclonic Storms
Desert Climate
Desert environments
Deserts
Dust
Dust - analysis
Dust storms
Earth and Environmental Science
Ecology
Ecosystem
Ecosystems
Ecotoxicology
Environment
Environmental Management
Environmental monitoring
Environmental Monitoring - methods
Environmental science
Frontogenesis
Humans
Instability
Iran
Meteorology
Monitoring/Environmental Analysis
NCEP/NCAR reanalysis
Outdoor air quality
Seasons
Summer
Surface stability
Troposphere
Uplift
Wind
Wind speed
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Summary:Being in vicinity of vast deserts, the west and southwest of Iran are characterized by high levels of dust events, which have adverse consequences on human health, ecosystems, and environment. Using ground based dataset of dust events in western Iran and NCEP/NCAR reanalysis data, the atmospheric circulation patterns of dust events in the Arabian region and west of Iran are identified. The atmospheric circulation patterns which lead to dust events in the Arabian region and western Iran were classified into two main categories: the Shamal dust events that occurs in warm period of year and the frontal dust events as cold period pattern. In frontal dust events, the western trough or blocking pattern at mid-level leads to frontogenesis, instability, and air uplift at lower levels of troposphere in the southwest of Asia. Non-frontal is other pattern of dust event in the cold period and dust generation are due to the regional circulation systems at the lower level of troposphere. In Shamal wind pattern, the Saudi Arabian anticyclone, Turkmenistan anticyclone, and Zagros thermal low play the key roles in formation of this pattern. Summer and transitional patterns are two sub-categories of summer Shamal wind pattern. In summer trough pattern, the mid-tropospheric trough leads to intensify the surface thermal systems in the Middle East and causes instability and rising of wind speed in the region. In synthetic pattern of Shamal wind and summer trough, dust is created by the impact of a trough in mid-levels of troposphere as well as existing the mentioned regional systems which are contributed in formation of summer Shamal wind pattern.
ISSN:0167-6369
1573-2959
DOI:10.1007/s10661-017-6196-8