Research

  • CRYOSPHERE-RIVER-CLIMATE CHANGE LINKAGES

    Global warming and climate change issues have been adversely affecting the Himalayan glaciers, which feed a number of large rivers in Indian subcontinent. However, the impacts of climate change on the hydrological budget of these rivers are currently not well known. Our group is trying to develop a hydro-geochemical model for snow/ice meltwaters to the headwaters of the Ganges River. The model will be developed using time-series observations of water discharge, physical (temperature, turbidity, and conductivity) and chemical (major ion and trace element concentrations, pH, dissolved oxygen, hydrogen and oxygen, as well as strontium isotopes) parameters of water samples near glaciated Ganges headwaters. We expect to characterize the seasonal and inter-annual δ18O and δ2H variability of Ganges River headwaters, and construct multi-component isotope and geochemical mixing models to quantify the relative contributions of rainwater, glacial melt, snow melt, and groundwater flow to the total discharge. Source apportionment of river water will be used to assess the impact on downstream ecosystem services due to the modification of hydrological regime, and will enable future predictions of change. We are also tracing the primary drivers of increased glacial melt in the central part of the Himalayan Glaciers

  • AEROSOL PARTICLE CHEMISTRY

    Our group has recently (2015) installed PM10, PM2.5, and PM1 (particles less than 10, 205, and 1 μm in diameter) aerosol samplers at several locations including Kanpur, Harsil (remote village in Himalaya at 2500 m elevation) and Leh (Ladhak region) to understand the long distance transport and source of airborne particles in the Indo-Gangetic plains. We are using radioactive isotopes (Rb-Sr, Sm-Nd, U-Th-Pb, Re-Os) and trace element geochemistry in airborne particulate matters to understand their sources and pathways. The overarching goal is to combine aerosol geochemistry and atmospheric models to better understand atmospheric processes.

  • LARGE RIVER SYSTEMS

    Our group in close collaboration with Woods Hole Oceanographic Institution is studying the river water chemistry of Ganges River to understand the processes operating in the Ganges watershed area. In particular, we are trying to understand the chemical connection between Indian subcontinent and Bay of Bengal by quantifying chemical fluxes from land-to-ocean. We are also studying small flood plain rivers and trying to quantify their roles in controlling the chemistry of large river systems.  

  • Ongoing Projects
     

    1.     On-Site Detection of Arsenic Fluoride & Hardness in Drinking Water, PI, Kent RO, 2019-2021

    2.     Developing Statistical Donwscaling To Improve Water Quality Understanding & Management In The Ramganga Sub-Basin, co-PI, EPSRC, 2019-2021

    3.     Magnitude and Pathways of Anthropogenic Platinum Group Elements: Emerging Environmental Contaminant in India, PI, DST, 2019-2021

    4.     Improved description of the water-cycle in the Upper-Ganga Catchment using isotopic, geochemical data and model simulations, PI, MoES, 2018-2021

    5.     Dust or soot? Tracing the primary drivers of increased glacial melt of the Himalayan glaciers, PI, DST. 2018-2021

    6.     Design and Development of Aquatic Autonomous Observatory (Niracara Svayamsasita VedhShala - NSVS) for In situ Monitoring, Real Time Data Transmission and Web based Visualization, co-PI, DST-IUSSTF, 2017-2020