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Bhuyan, Kalyan
- Impact of Lockdown Due to COVID-19 Outbreak on O3 and its Precursor Gases, PM and BC Over Northeast India
Abstract Views :274 |
PDF Views:94
Authors
Binita Pathak
1,
Pradip Kumar Bhuyan
2,
Arshini Saikia
2,
Kalyan Bhuyan
1,
P. Ajay
2,
Sankar Jyoti Nath
2,
Shyam Lochan Bora
1
Affiliations
1 Department of Physics, Dibrugarh University, Dibrugarh 786 004, IN
2 Centre for Atmospheric Studies, Dibrugarh University, Dibrugarh 786 004, IN
1 Department of Physics, Dibrugarh University, Dibrugarh 786 004, IN
2 Centre for Atmospheric Studies, Dibrugarh University, Dibrugarh 786 004, IN
Source
Current Science, Vol 120, No 2 (2021), Pagination: 322-331Abstract
Copernicus Atmosphere Monitoring Service (CAMS) data are used to evaluate the impact of the lockdown (24 March–3 May 2020) on the concentrations of surface O3, NOx, CO, SO2, PM and BC compared to those measured during the same period in 2015–2019 over northeast India and adjoining areas. Measurements made at Dibrugarh complements the CAMS observations. The NOx, NO2, CO, SO2, BC and PM concentrations dipped appreciably over northeast India and nearby countries. Similar decrement is observed in Dibrugarh in 2020 over their reference levels. Reduction of precursor gases triggered an increase in O3 concentration across northeast India and adjoining South Asia and at Dibrugarh. The air quality over the region improved from moderate to satisfactory levels due to the lockdown.Keywords
Aerosols, Air Quality, COVID-19, Lockdown, Northeast India, Particulate Matter, Trace Gases.Full Text
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- Analysis of rainfall trend using non-parametric methods and innovative trend analysis during 1901–2020 in seven states of North East India
Abstract Views :207 |
PDF Views:89
Authors
Affiliations
1 Department of Physics, DDR College, Chabua, Dibrugarh 786 184, India; Department of Physics, Dibrugarh University, Dibrugarh 786 004, IN
2 Department of Physics, Dibrugarh University, Dibrugarh 786 004, IN
3 Department of Statistics, Dibrugarh University, Dibrugarh 786 004, IN
1 Department of Physics, DDR College, Chabua, Dibrugarh 786 184, India; Department of Physics, Dibrugarh University, Dibrugarh 786 004, IN
2 Department of Physics, Dibrugarh University, Dibrugarh 786 004, IN
3 Department of Statistics, Dibrugarh University, Dibrugarh 786 004, IN
Source
Current Science, Vol 122, No 7 (2022), Pagination: 801-811Abstract
In this study, we analysed the variability and trends in annual as well as seasonal rainfall in the seven states of North East India for the period 1901–2020, using non-parametric tests like Mann–Kendall, trend-free pre-whitening Mann–Kendall, modified Mann–Kendall (MMK), as well as using the innovative trend analysis (ITA). The study revealed the variabilities in annual and seasonal rainfall in these seven states. In most cases, the results of all the tests were identical. However, significant differences were observed in the case of post-monsoon rainfall of Assam and Meghalaya, pre-monsoon rainfall of Arunachal Pradesh, Mizoram and Tripura, as well as in winter rainfall of Arunachal Pradesh and monsoon rainfall of Tripura. Compared to the other states of NE India and other tests, ITA detected no significant annual trend for Tripura; however, the winter season exhibited a decreasing trend. It was observed that only the MMK test could predict such changes in rainfall distribution across seasons to a certain extent at varying significance levels in comparison to the other three methods. Since these states are vulnerable to water-related disasters, this study could help policymakers arrive at valuable climatic and water resource management decisions.Keywords
Climate change, innovative trend analysis, non-parametric tests, rainfall patterns, water resource management.Full Text
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