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Temporal Record of Atmospheric Sulphur dioxide Column Densities over Pakistan by using Satellite Observations

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dc.contributor.author Palwasha Khattak
dc.date.accessioned 2020-10-21T10:19:19Z
dc.date.available 2020-10-21T10:19:19Z
dc.date.issued 2013
dc.identifier.uri http://10.250.8.41:8080/xmlui/handle/123456789/2963
dc.description Supervisor: Dr. Muhammad Fahim Khokhar en_US
dc.description.abstract Sulfur dioxide (SO2) is a chemically active trace gas and one of the major criteria pollutants. Pakistan lacks the monitoring facility on a larger scale to measure atmospheric gases on regular bases. This study presents the results of atmospheric SO2 column densities obtained from satellite observation over Pakistan during the time period of 2004 – 2012. level-2 data product of satellite instruments SCIAMACHY onboard ENVISAT, OMI onboard Aura and GOME-2 onboard Metop retrieved by using Differential optical absorption spectroscopy (DOAS) technique are used. Spatio-temporal distribution of SO2 column densities along with the seasonal variation over main cities and regions of Pakistan has been discussed. The Nabro volcano eruption in 2011 had caused high SO2 columns over East Africa, Middle East and South Asian regions. Satellite images tracked the transported SO2 pollution over Pakistan during this event. Other significant volcanic eruptions and their trans boundary effect over Pakistan’s atmosphere have also been discussed in this study. Back trajectory analysis is performed to track the origin of air masses with high SO2 column densities detected over Pakistan. Temporal evolution of SO2 column densities exhibited an overall increase of 70% (125% with fraction of trans-boundary SO2 pollution from regional volcanoes) during the time period of 2004-2012. Spatial and temporal analyses of SO2 pollution over Pakistan by using satellite observation has been discussed for the first time in Pakistan. en_US
dc.publisher National University of Sciences and Technology en_US
dc.subject Environmental Engineering ,Atmospheric Sulphur dioxide Column en_US
dc.title Temporal Record of Atmospheric Sulphur dioxide Column Densities over Pakistan by using Satellite Observations en_US
dc.type Thesis en_US


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