Aerosol black carbon quantification in the central Indo-Gangetic Plain: Seasonal heterogeneity and source apportionment

https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2019EA000620

On the Relationship Between Aerosol and Boundary Layer Height in Summer in China Under Different Thermodynamic Conditions

A better understanding of land cover/land use changes (LCLUC) and their interactions with the atmospheric environment is essential for the sustainable management of natural resources, environmental protection, air quality, agricultural planning and food security. The 15 papers published in this focus issue showcase a variety of studies relating to drivers and impacts of LCLUC and air pollution in different South/Southeast Asian (S/SEA) countries. This synthesis article, in addition to giving context to the articles in this focus issue, also reviews the broad linkages between population, LCLUC and air pollution. Additionally, we identify knowledge gaps and research priorities that are essential in addressing air pollution issues in the region. We conclude that for effective pollution mitigation in S/SEA countries, quantifying drivers, sources and impacts of pollution need a thorough data analysis through ground-based instrumentation, models and integrated research approaches. We also stress the need for the development of sustainable technologies and strengthening the scientific and resource management communities through capacity building and training activities to address air pollution issues in S/SEA countries.

https://iopscience.iop.org/article/10.1088/1748-9326/aa9c5d/pdf

Land cover, land use changes and air pollution in Asia: a synthesis

Exceedances and trends of particulate matter (PM2.5) in five Indian megacities.

Black carbon aerosol in India: A comprehensive review of current status and future prospects

https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2018RS006614

Gravity Wave Behavior in Lower Stratosphere During Tropical Cyclones Over the Bay of Bengal

The present study deals with the interplay of multiple atmospheric processes in changing the microphysical properties of precipitation during the pre-monsoon season (March–May) using the long-term experimental data of raindrop size distributions (DSDs) spanning over 15 years (2005–2019) obtained at an urban tropical location, Kolkata (22.57°N, 88.37°E), near the land–sea boundary. The changing pattern of air mass flows from the maritime and continental region, which contribute to the formation of precipitation processes, has been responsible for the varying characteristics of rain. Changes in raindrop sizes are related to aerosol properties, cloud features, temperature, and relative humidity that change mass-weighted mean drop diameter (<inline-formula> <tex-math notation="LaTeX">$D_{m}$ </tex-math></inline-formula>) differently in low and high rain rate regimes. <inline-formula> <tex-math notation="LaTeX">$D_{m}$ </tex-math></inline-formula> has shown an increasing trend over time for low rain rates (< 15 mm/h), but a decreasing trend for high rain rate regimes (≥15 mm/h). An increase (decrease) in mean temperature (relative humidity) below the atmospheric boundary layer (< 1.6 km) has enhanced the evaporation of small raindrops and altered rain microphysical features. Based on satellite observations, it has been found that the increasing aerosol optical depth (AOD) has been accompanied by an increase in cloud effective radius (CER), resulting in the anti-Twomey effect, which is due to the dominance of maritime influence over continental activities. Because of the predominant maritime activities, sea salt aerosols have a greater presence, causing an increase in CER, which consequently prevents raindrops from becoming large enough before they fall, thereby reducing <inline-formula> <tex-math notation="LaTeX">$D_{m}$ </tex-math></inline-formula> at high rainfall rates.

Soumyajyoti Jana

Papers

Gravity Wave Behavior in Lower Stratosphere During Tropical Cyclones Over the Bay of Bengal

Long-Term Impact of Continental and Maritime Airflow on Aerosol Environment and Rain Microstructure Near Land–Sea Boundary

Columnar Aerosol Optical Depth, Water Vapor and Ozone over a semi-arid urban location of western India: Potential Sources and Direct Radiative Effects

Gravity Wave Activities Associated with Convective Phenomena at a Tropical Location near Land‐Sea Boundary

The Effect of Aerosol on Gravity Wave Characteristics above the Boundary Layer over a Tropical Location