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dc.contributor.author
Damanafshan, Mahsa
dc.contributor.author
Ali Aliakbari Bidokhti, Abbas
dc.contributor.author
Alizadeh, Omid
dc.contributor.author
Sprenger, Michael
dc.date.accessioned
2023-06-28T11:42:33Z
dc.date.available
2023-05-29T03:31:26Z
dc.date.available
2023-06-08T12:43:17Z
dc.date.available
2023-06-28T11:42:33Z
dc.date.issued
2023-03
dc.identifier.issn
2008-0336
dc.identifier.issn
2783-168X
dc.identifier.other
10.30499/IJG.2022.344755.1429
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/614013
dc.description.abstract
In this study, the distribution of tropospheric ozone as an air pollutant and an important greenhouse gas has been investigated in various layers of the troposphere over Southwest Asia. This research has been conducted for a 5-year period (2012-2016) using the Copernicus Atmosphere Monitoring Service Reanalysis (CAMSRA) dataset, the result of the third European Centre for Medium-Range Weather Forecasts (ECMWF) project on atmospheric composition reanalysis. The analysis of the monthly mean concentration of tropospheric ozone over Southwest Asia and its time series (6-hourly data for the 5-year period) over three areas in northwestern and southeastern Iran, and Tehran show that the concentration of ozone has an annual cycle, with the maximum in summer. The maximum ozone in different layers of the troposphere (at the surface, and 700 and 500 hPa) occurs during summer. The maximum concentration in the lower layers (up to 700 hPa) is mostly caused by anthropogenic sources, while in the middle to upper troposphere, it is the result of the injection of stratospheric air into the troposphere. The high concentration of NO2 in highly populated metropolitan areas, such as Tehran and industrial areas in the Persian Gulf and the Gulf of Oman, contributes to the photochemical production of ozone. In these areas, the concentration of ozone is higher during the daytime and summer compared to the nighttime and winter. This is due to the increase in the photochemical production of ozone when the incoming solar radiation is high. Moreover, there are two hot spots of ozone concentration at 500 hPa over two regions: the eastern Mediterranean region and the east of the Caspian Sea toward Afghanistan. Large-scale subsidence and the occurrence of the tropopause fold and/or the stratosphere to troposphere transport (STT) in these two regions, linked to the Indian summer monsoon, are the main causes of the occurrence of high concentrations of ozone in the middle troposphere. The monsoon diabatic heating can induce Gill-type Rossby waves that propagate westward and cause descent via the interaction with the midlatitude westerlies. The topography of the region, e.g., the Zagros Mountains, is also effective in increasing this descent. In general, every horizontal airflow that encounters steep isentropic slopes at the upper and middle troposphere is forced to descend. We were able to detect a wave-like pattern in ozone concentration at the 300 hPa level, which can be linked to a corresponding pattern of vertical velocities in the region. Furthermore, the statistical analysis indicates that high ozone concentration events frequently occur in southeastern Iran. This could be due to transient variations in the monsoon circulation over India, the Tibetan anticyclone, and the mid-level anticyclone, all of which also affect the transport of the stratospheric ozone in the region.
en_US
dc.language.iso
fa
en_US
dc.publisher
Iranian Geophyisical Society
en_US
dc.subject
Tropospheric ozone
en_US
dc.subject
Tropopause fold
en_US
dc.subject
Stratospheric ozone
en_US
dc.subject
Southwest Asia
en_US
dc.title
Distribution of tropospheric ozone over southwest Asia
en_US
dc.title.alternative
توزیع ازون وردسپهری در منطقه جنوب غرب آسیا و عوامل مؤثر بر آن
en_US
dc.type
Journal Article
ethz.journal.title
Iranian Journal of Geophysics
ethz.journal.volume
17
en_US
ethz.journal.issue
1
en_US
ethz.pages.start
185
en_US
ethz.pages.end
204
en_US
ethz.identifier.scopus
ethz.publication.place
Tehran
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02717 - Institut für Atmosphäre und Klima / Inst. Atmospheric and Climate Science::03854 - Wernli, Johann Heinrich / Wernli, Johann Heinrich
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02717 - Institut für Atmosphäre und Klima / Inst. Atmospheric and Climate Science::03854 - Wernli, Johann Heinrich / Wernli, Johann Heinrich
ethz.date.deposited
2023-05-29T03:31:27Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Metadata only
en_US
ethz.rosetta.installDate
2023-06-08T12:43:18Z
ethz.rosetta.lastUpdated
2024-02-03T00:42:46Z
ethz.rosetta.versionExported
true
ethz.COinS
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