An observational study of aerosol optical properties and their relationships with meteorological parameters over Bangladesh

Mamun, Mainul Islam

doi:10.9790/0990-02617584

Cited by 7 publications

(7 citation statements)

References 25 publications

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“…CO and NO 2 trends show good similarities in monthly variations. A quite apparent similarity of monthly variations in trace gases with AOD is also found, as AOD also increases from the start of each year and reaches its peak values during the summer months, in general June, and then again decreases (Mamun et al 2014b). The trace gases show strong seasonal variations.…”

Section: Decadal Trends Of Trace Gases Over Bangladeshmentioning

confidence: 55%

“…Seasonal variation of trace gases also has a good correlation with AOD. The highest level of AOD was observed in the pre-monsoon, and a decreasing trend in AOD was observed after summer and at the start of the monsoon (Mamun et al 2014b). …”

Section: Monthly and Seasonal Mean Variations Of Trace Gasesmentioning

confidence: 90%

“…The highest loading of O 3 was seen in the northwestern Rajshahi and Dinajpur districts, and the lowest loading of O 3 was found in the southeastern Bandarban and coastal Cox-bazar districts (Figure 2(c)). In general, loading of trace gases shows a good association with aerosol loading, as Mamun et al (2014b), in their analysis, found higher aerosol concentration in the western part of Bangladesh. Hence, strong aerosol concentrations enhance the emission of trace gases.…”

Section: Spatial Variations In Trace Gases Over Bangladeshmentioning

confidence: 92%

“…The results show a clear increase in trace gases loading with aerosols over Bangladesh during the last decade. During the pre-monsoon, all the trace gases and aerosols loading (Mamun et al 2014b) show highest levels with increasing trends during the last decade, indicating that pre-monsoon or summer is the most important season in Bangladesh that has a severe impact on air quality.…”

Section: Seasonal Climatological Trends Of Trace Gasesmentioning

confidence: 97%

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Pattern analysis of trace gases over Bangladesh using satellite remote sensing

Islam

Mamun

Rasel

et al. 2015

International Journal of Remote Sensing

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Trace gases are important components for climate change process, and Earth's climate is sensitive to change in their atmospheric concentrations; therefore, proper assessment of trace gases is essential for ongoing global climate simulation. The spatio-temporal variations of four trace gases, namely carbon monoxide (CO), nitrogen dioxide (NO 2 ), ozone (O 3 ), and carbon dioxide (CO 2 ), over Bangladesh during the last decade are analysed using the remote-sensing data sets of the Atmospheric Infrared Sounder (AIRS) and Ozone Monitoring Instrument (OMI). Monthly, seasonal, and annual mean variations of trace gases were assessed. Higher CO, O 3 , and CO 2 concentrations show west-to-east gradient, indicating the impact of both local meteorology and emissions on variations in trace gases. On the other hand, total NO 2 concentration increases over Dhaka because of large population density, high traffic emission, larger industrial activities, and highly polluted air. The inter-annual variations of trace gases are mainly due to large-scale climatic phenomena such as El Niño and La Niña conditions. All the trace gases show strong seasonality, with higher levels during pre-monsoon season and lower levels during monsoon season, which are caused by the seasonal variations in biomass burning (BB), long-range transportation, and rainfall in South and Southeast Asia (S-SE Asia). However, O 3 concentration reveals minimum loading during winter season, associated with the reduction of O 3 formation in cold days due to insufficient heat. These findings are important to estimate regional climate variability due to trace gases.

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Section: Decadal Trends Of Trace Gases Over Bangladeshmentioning

confidence: 55%

Section: Monthly and Seasonal Mean Variations Of Trace Gasesmentioning

confidence: 90%

Section: Spatial Variations In Trace Gases Over Bangladeshmentioning

confidence: 92%

Section: Seasonal Climatological Trends Of Trace Gasesmentioning

confidence: 97%

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Pattern analysis of trace gases over Bangladesh using satellite remote sensing

Islam

Mamun

Rasel

et al. 2015

International Journal of Remote Sensing

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“…From BB sources many primary species are emitted are the precursors of O 3 and secondary organic aerosol (SOA). In western part of India (Mamun et al, 2014b), in their analysis found that the concentration of higher aerosol present and significance of trace gas shows an interlinked with aerosol loading. The highest column of O 3 seen in the northern and eastern part of India region during period 2006-2015 in winter, and spring season due to biomass burning etc., and in season summer and autumn O 3 was highest in northeast and northern part of India region, whereas column amount of O 3 decreasing in season winter and spring in southern and in season summer and autumn in north, northwest, and west part of India region are shown above in Figure (1).…”

Section: Resultsmentioning

confidence: 98%

A Study of Annual and Seasonal Variations in Tropospheric Ozone (O<sub>3</sub>) Concentrations over India

Gupta¹,

Saha²

2020

Preprint

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India is one of the large sources of the anthropogenic pollutants and their increasing emission due to the recent economic growth in India. In this study we analyzed the annual and seasonal behaviors of ozone (O3) gas using satellite remote sensing dataset from the sources Ozone Monitoring Instrument (OMI) over India region from 2006-2015. The study focuses on the seasonal behaviors of O3 gas i.e., monthly, seasonal, annual mean variations of trace gas and also trend analysis of O3 gas and comparison of the seasonal behavior of the ozone gas by trend analysis were assessed. In this study we also taken eleven cities to show the increment and decrement in four seasons of O3 gas by taking 2006 as a base year and investigate the behaviors of gases during (2007-2015) years. Higher concentrations of O3 south-to-north gradient, indicating the variations due to the impact of emissions and local meteorology. Ozone concentrations were higher during the warmer months. However, in winter season lowest concentration of O3 seen due to the less amount of heat and due to cold days and ozone holes in the stratosphere. Instead, total O3 concentrations rises over Delhi, Lucknow and Kolkata due to large population density, high traffic emission, highly polluted air and larger industrial activities.

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