干旱区生态环境知识资源中心(Arid): Synoptic analysis of the most durable pollution and clean waves during 2009-2019 in Tehran City (capital of Iran)

Arid

DOI	10.1007/s11069-021-04990-5
	Synoptic analysis of the most durable pollution and clean waves during 2009-2019 in Tehran City (capital of Iran)
	Hombari, Farzaneh Jafari; Pazhoh, Farshad
通讯作者	Pazhoh, F (corresponding author), Kharazmi Univ, Dept Phys Geog, Tehran, Iran.
来源期刊	NATURAL HAZARDS
ISSN	0921-030X
EISSN	1573-0840
出版年	2021-08
英文摘要	The present study was done to analyze and compare synoptic conditions during the most durable pollution and clean waves (MDPW and MDCW) in Tehran City (capital of Iran). For this purpose, air quality index (AQI) data were first obtained during 2009-2019 from the Tehran Air Quality Control Company in Tehran Province. Then, a threshold of (AQI <= 101) representing a polluted and unhealthy atmosphere was considered as MDPW, and a threshold of (AQI <= 50) representing a clean (good) air was selected as MDCW in Tehran City by identifying the polluted days. The results showed the presence of MDPW during 43 polluted days from November 21, 2010 to January 2, 2011. Intensity and frequency of the polluted days during statistical period showed a decreasing trend that coincided with an increasing trend of precipitation. Analysis of synoptic conditions occurred during 43 days of MDPW indicated penetration of Siberian high-pressure from the east at sea level and extension of sub-tropical anticyclone in mid-level from the west that led to development of an anticyclone circulation with descending and converging flow in Iran and surrounding region. As a result, a calm and sustainable climate and stable concentration of pollutants were observed throughout Tehran City. Backward trajectory of sources and entry route of the polluted air to Tehran City during peak days of pollution showed that desert regions of southern Iraq and central Iran along the southern and southwestern parts played a major role in increasing concentration of pollutants during occurrence of durable wave. Different routes were observed in entry of dusty and the polluted air to Tehran City according to hybrid single-particle Lagrangian integrated trajectory (HY SPLIT) model, but in most of peak days, the areas that were near and adjacent to Tehran City with height of less than 1000 m played a greater role in particle transport. Investigation of instability indices during MDPW showed that in most days of pollution, values of instability intensity were classified into weak class and lower troposphere (1000-850 hPa) compared to higher levels, and degree of stability and calmness of the atmosphere was more. So that, the highest frequency of temperature inversions occurred near the earth's surface.
英文关键词	Polluted air Air quality index Durable wave Stable atmosphere Tehran
类型	Article ; Early Access
语种	英语
开放获取类型	Green Published, Bronze
收录类别	SCI-E
WOS记录号	WOS:000686883700001
WOS关键词	MOISTURE FLUX CONVERGENCE ; AIR-POLLUTION ; PATTERNS ; ASSOCIATION ; REANALYSIS ; EMISSIONS ; QUALITY
WOS类目	Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences ; Water Resources
WOS研究方向	Geology ; Meteorology & Atmospheric Sciences ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/364216
作者单位	[Hombari, Farzaneh Jafari] Shahid Beheshti Univ, Dept Phys Geog, Tehran, Iran; [Pazhoh, Farshad] Kharazmi Univ, Dept Phys Geog, Tehran, Iran
推荐引用方式 GB/T 7714	Hombari, Farzaneh Jafari,Pazhoh, Farshad. Synoptic analysis of the most durable pollution and clean waves during 2009-2019 in Tehran City (capital of Iran)[J],2021.
APA	Hombari, Farzaneh Jafari,&Pazhoh, Farshad.(2021).Synoptic analysis of the most durable pollution and clean waves during 2009-2019 in Tehran City (capital of Iran).NATURAL HAZARDS.
MLA	Hombari, Farzaneh Jafari,et al."Synoptic analysis of the most durable pollution and clean waves during 2009-2019 in Tehran City (capital of Iran)".NATURAL HAZARDS (2021).