Multi-Model Evaluation of Meteorological Drivers, Air Pollutants and Quantification of Emission Sources over the Upper Brahmaputra Basin

Saikia, Arshini; Pathak, Binita; Singh, Prashant; Bhuyan, Pradip Kumar; Adhikary, Bhupesh

doi:10.3390/atmos10110703

Cited by 9 publications

(4 citation statements)

References 101 publications

(126 reference statements)

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“…In this kind of setup, we were able to overcome computational limitations in terms of storage and processing capacity. Both of the simulations (25 km and 4 km resolutions) used National Center for Environmental Prediction Final Analysis (NCEP-FNL) for the meteorological initial conditions [7,24], whereas boundary conditions for the simulation at WC/WRF25 used NCEP-FNL and the simulations at WC/WRF4 used meteorological data from WC/WRF25. In a similar way, the WC25 simulations used chemical boundary conditions from a global simulation model for ozone and related chemical tracers, version 4(Mozart-4) [33].…”

Section: Model Setupmentioning

confidence: 99%

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Vertical Distribution of Aerosols during Deep-Convective Event in the Himalaya Using WRF-Chem Model at Convection Permitting Scale

2021

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The Himalayan region is facing frequent cloud bursts and flood events during the summer monsoon season. The Kedarnath flooding of 2013 was one of the most devastating recent events, which claimed thousands of human lives, heavy infrastructure, and economic losses. Previous research reported that the combination of fast-moving monsoon, pre-existing westerlies, and orographic uplifting were the major reasons for the observed cloud burst over Kedarnath. Our study illustrates the vertical distribution of aerosols during this event and its possible role using the Weather Research and Forecasting model coupled with chemistry (WRF-Chem) simulations. Model performance evaluation shows that simulations can capture the spatial and temporal patterns of observed precipitation during this event. Model simulation at 25 km and 4 km horizontal grid resolution, without any changes in physical parameterization, shows a very minimal difference in precipitation. Simulation at convection-permitting scale shows detailed information related to parcel motion compared to coarser resolution. This indicates that the parameterization at different resolutions needs to be further examined for a better outcome. The modeled result shows changes of up to 20–50% in the rainfall over the area near Kedarnath due to the presence of aerosols. Simulation at both resolutions shows the significant vertical transport of natural (increases by 50%+) and anthropogenic aerosols (increases by 200%+) during the convective event, which leads to significant changes in cloud properties, rain concentration, and ice concentration in the presence of these aerosols. Simulations can detect changes in important instability indices such as convective available potential energy (CAPE), convective inhibition energy (CIN), vorticity, etc., near Kedarnath due to aerosol–radiation feedback.

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Section: Model Setupmentioning

confidence: 99%

“…A previous study has indicated that the presence of aerosols can enhance or suppress rain over Asian regions [4]. The Indo-Gangetic Plain (IGP), which is known as a hotspot of anthropogenic pollution in South Asia [5][6][7], as well as the deserts of Rajasthan and middle east Asia [8], supply ample aerosols to the Himalayan region.…”

Section: Introductionmentioning

confidence: 99%

Vertical Distribution of Aerosols during Deep-Convective Event in the Himalaya Using WRF-Chem Model at Convection Permitting Scale

2021

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“…Barman and Gokhale ( 2019 ) reported enhanced BC mass concentration (BCC) over Guwahati city, mainly contributed by vehicular emissions. Saikia et al ( 2019 ) stated that open biomass burning is the region’s dominant source of BC and CO.…”

Section: Introductionmentioning

confidence: 99%

Impact of Biomass Burning on Black Carbon and NO2 Over North Eastern Region of India Using Multi-satellite Observations

Borgohain

Gogoi

Barman

et al. 2023

J Indian Soc Remote Sens

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Large scale biomass burning like forest fires and crop residue burning can significantly impact the physical environment, including land cover, land use, ecology, habitats, and climate change. We investigated the effect of fire counts on surface Black Carbon mass concentration (BCC) and Tropospheric Columnar NO 2 (TCN) over the North Eastern Region (NER) of India in the domain: 20° N–30° N and 88° E–98° E for 15 years from 2006 to 2020 using MODIS, MERRA-2 and OMI data. Significant fire counts are recorded in January, February, March, and April. An average of 65,000 fire counts is recorded in March and April during the 15 years of study over the domain. TCN is high in Mizoram, Manipur, and Nagaland, followed by Assam, Tripura, and Meghalaya in March and April, which varies from 18.79 × 10 14 to 29.08 × 10 14 cm −2 in March, 10.76 × 10 14 –15.81 × 10 14 cm −2 in January and February, and 12.67 × 10 14 –14.2 × 10 14 cm −2 in April. Spatially averaged BC varies from 1.80 to 2.76 µg m −3 in January and February and 1.82–2.36 µg m −3 in March. BCC is high in Mizoram, Tripura, Manipur, Nagaland, and Brahmaputra valley of Assam than in the rest of the NER.

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“…36 Only a few studies have reported the association of reanalysis data of carbonaceous aerosol mass concentrations with groundbased observations over South Asia. For example, Saikia et al 37 and Pathak et al 38 reported the association of ground-based measured BC with CAMS and MERRA-2 at Dibrugarh, located in India's northeast region. Prabhu et al 21 reported the association of ground-based measured BC with CAMS and MERRA-2 at Dehradun, located in the foothills of western Himalayas.…”

Section: Introductionmentioning

confidence: 99%

Multiple site ground-based evaluation of carbonaceous aerosol mass concentrations retrieved from CAMS and MERRA-2 over the Indo-Gangetic Plain

Soni

Mandariya

Rajeev

et al. 2021

Environ. Sci.: Atmos.

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Multi-Model Evaluation of Meteorological Drivers, Air Pollutants and Quantification of Emission Sources over the Upper Brahmaputra Basin

Cited by 9 publications

References 101 publications

Vertical Distribution of Aerosols during Deep-Convective Event in the Himalaya Using WRF-Chem Model at Convection Permitting Scale

Vertical Distribution of Aerosols during Deep-Convective Event in the Himalaya Using WRF-Chem Model at Convection Permitting Scale

Impact of Biomass Burning on Black Carbon and NO2 Over North Eastern Region of India Using Multi-satellite Observations

Multiple site ground-based evaluation of carbonaceous aerosol mass concentrations retrieved from CAMS and MERRA-2 over the Indo-Gangetic Plain

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