Ground-Based Remote Sensing of Aerosol Properties over a Coastal Megacity of Pakistan
Joint Authors
Source
Issue
Vol. 2018, Issue 2018 (31 Dec. 2018), pp.1-12, 12 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2018-05-13
Country of Publication
Egypt
No. of Pages
12
Main Subjects
Abstract EN
Atmospheric aerosols are considered to be an important constituent of Earth’s atmosphere because of their climatic, environmental, and health effects.
Therefore, while studying the global climate change, investigation of aerosol concentrations and properties is essential both at local and regional levels.
In this paper, we have used relatively long-term Aerosol Robotic Network (AERONET) data during September 2006–August 2014 to analyze aerosol properties such as aerosol optical depth at 500 nm (AOD), Ångström exponent (440–870 nm) (AE), refractive index (RI), and asymmetry parameter over Karachi, a coastal megacity of Pakistan.
The average annual values of AOD and AE were found to be 0.48 ± 0.20 and 0.59 ± 0.29, respectively.
The peak (0.88 ± 0.31) AOD was recorded in July with corresponding AE of 0.30 ± 0.22 representing reasonably higher concentration of coarse size particles over Karachi.
The cluster analysis using the scatter plot between absorption AE and extinction AE revealed that desert dust prevailed in the atmosphere of Karachi in spring and summer, while biomass burning aerosols dominate in autumn and winter.
The peak values of volume concentrations of coarse and fine-mode particulate matter were found in summer and autumn, respectively.
Also, we found significant growing trend in single-scattering albedo with wavelength, indicating the domination of dust particles during summer and spring.
The peak value of the real part of the RI was observed in spring (1.53) and modest in winter (1.50).
On the contrary, the peak value of the imaginary part of the RI was observed to be constantly elevated in winter and lesser in spring.
American Psychological Association (APA)
Tariq, Salman& ul-Haq, Zia. 2018. Ground-Based Remote Sensing of Aerosol Properties over a Coastal Megacity of Pakistan. Advances in Meteorology،Vol. 2018, no. 2018, pp.1-12.
https://search.emarefa.net/detail/BIM-1118698
Modern Language Association (MLA)
Tariq, Salman& ul-Haq, Zia. Ground-Based Remote Sensing of Aerosol Properties over a Coastal Megacity of Pakistan. Advances in Meteorology No. 2018 (2018), pp.1-12.
https://search.emarefa.net/detail/BIM-1118698
American Medical Association (AMA)
Tariq, Salman& ul-Haq, Zia. Ground-Based Remote Sensing of Aerosol Properties over a Coastal Megacity of Pakistan. Advances in Meteorology. 2018. Vol. 2018, no. 2018, pp.1-12.
https://search.emarefa.net/detail/BIM-1118698
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1118698