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Title: Variability of surface ozone and its impact on air quality over Kannur
Researcher: Nishanth T
Guide(s): Satheesh Kumar M K
Keywords: Ozone, Atmosphere
Upload Date: 21-Apr-2014
University: Kannur University
Completed Date: 2013
Abstract: Ozone (O3,) produced in the troposphere plays a vital role in the radiative and chemical processes of the atmosphere due to its strong oxidizing capability.Subsequently, surface O3 is one of the ideal trace gases present in the troposphere which can modulate the chemistry to a larger extent. Being a prominent green house gas and a good tracer with fairly small lifetime, the variation in the abundance of ground level O3is an ideal method to explore the photochemistry and dynamics of the atmosphere. The chemistry that leads to tropospheric O3 formation is generally initiated by the photolysis of NO2. In the presence of solar radiation NO2 photolysis to produce NO and atomic oxygen and this atomic oxygen reacts with O2 to produce O3. The conversion of NO to NO2 without O3 occurs through a combination of the reaction cycles of hydroxyl (OH) or peroxyl radicals (HO2). In these cycles, OH radicals are converted to HO2 or RO2, through their reaction with CO or hydrocarbons. The increasing trends in ground levelO3 in the urban and rural areas of industrialized regions are strongly linked to the changes in anthropogenic emissions of O3 precursors and revealed that its key role in imparting global warming and subsequent climate changes. Over the last few decades, several studies have revealed that background O3 in the troposphere has almost doubled that compared to the pre industrial era. In order to explore surface O3 chemistry and its transport at Kannur, a tropical coastal site in the state of Kerala, continuous observations has been going on since 2009 at Kannur University with the support of ISRO-GBP (AT-CTM) programme. This thesis is focused on the observations on the variations of ground level O3 mixing ratio and its precursors at Kannur (11.9oN and 75.4oE, 5m asl), in north Kerala confined in the coastal belt of Arabian Sea and Western Ghats. In order to discuss the objectivity effectively, the thesis is divided into seven chapters.
Pagination: xiv,176p.
Appears in Departments:Government Brennen College

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01_title.pdfAttached File76.97 kBAdobe PDFView/Open
02_certificate.pdf114.65 kBAdobe PDFView/Open
03_declaration.pdf89.51 kBAdobe PDFView/Open
04_acknowledgement.pdf208.07 kBAdobe PDFView/Open
05_abstract.pdf251.87 kBAdobe PDFView/Open
06_contents.pdf280.94 kBAdobe PDFView/Open
07_chapter 1.pdf2.23 MBAdobe PDFView/Open
08_chapter 2.pdf2.96 MBAdobe PDFView/Open
09_chapter 3.pdf10.86 MBAdobe PDFView/Open
10_chapter 4.pdf19 MBAdobe PDFView/Open
11_chapter 5.pdf2.35 MBAdobe PDFView/Open
12_chapter 6.pdf8.59 MBAdobe PDFView/Open
13_chapter 7.pdf312.02 kBAdobe PDFView/Open
14_references.pdf1.13 MBAdobe PDFView/Open

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