About
33
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Introduction
The central theme of my research is to understand how water flows within natural landscapes, from the time it enters the ecosystem through rainfall or snowfall to the time it finally emerges into the nearby river or stream. In my current project, I am investigating how different precipitation phases (rainfall and snowfall) are partitioned into streamflow and evapotranspiration in the Swiss Alps using multiple data sources like stable water isotopes, plant phenology & remote sensing products.
Skills and Expertise
Current institution
Additional affiliations
December 2020 - present
Position
- PostDoc Position
Description
- The title of my project is "Partitioning of snowmelt and rainfall between trees and streams: hydrologic response of terrestrial ecosystems to drought". In this project, I am investigating how different precipitation phases (rainfall and snowfall) are partitioned into streamflow and evapotranspiration in the Swiss Alps using multiple data sources like stable water isotopes, remote sensing products and plant phenology datasets.
December 2020 - present
Position
- PostDoc Position
Description
- The title of my project is "Partitioning of snowmelt and rainfall between trees and streams: hydrologic response of terrestrial ecosystems to drought". In this project, I am investigating how different precipitation phases (rainfall and snowfall) are partitioned into streamflow and evapotranspiration in the Swiss Alps using multiple data sources like stable water isotopes, remote sensing products and plant phenology datasets.
May 2015 - July 2015
Education
September 2016 - October 2020
July 2011 - July 2016
Publications
Publications (33)
The last couple of decades have seen the outburst of a number of satellite-based precipitation products with Tropical Rainfall Measuring Mission (TRMM) as the most widely used for hydrologic applications. Transition of TRMM into the Global Precipitation Measurement (GPM) promises enhanced spatio-temporal resolution along with upgrades to sensors an...
From a water storage perspective, snowfall-dominated catchments are particularly challenging since incoming precipitation is stored over long time periods on ground before entering the subsurface. In a warming climate, more precipitation is expected to fall as liquid rain versus solid snow. Given that snow is often more efficient at recharging grou...
Snowfall may have different stable isotopic compositions compared with rainfall, allowing its contribution to potentially be tracked through the hydrological cycle. This review summarizes the state of knowledge of how different hydrometeorological processes affect the isotopic composition of snow in its different forms (snowfall, snowpack, and snow...
Tracers have been used for over half a century in hydrology to quantify water sources with the help of mixing models. In this paper, we build on classic Bayesian methods to quantify uncertainty in mixing ratios. Such methods infer the probability density function (PDF) of the mixing ratios by formulating PDFs for the source and target concentration...
Hydrological fluxes typically vary across seasons, with several existing metrics available to characterize their seasonality. These metrics are beneficial when many catchments across diverse climates and landscapes are studied 10 concurrently. Here, we present directional statistics to characterize streamflow seasonality, capturing the timing of st...
About 80 % of the precipitation at the Colorado River's headwaters is snow, and the resulting snowmelt-driven hydrograph is a crucial water source for about 40 million people. Snowmelt from alpine and subalpine snowpack contributes substantially to groundwater recharge and river flow. However, the dynamics of snowmelt progression are not well under...
About 80 % of the precipitation in the Colorado River’s headwaters is snow, and the resulting snowmelt-driven hydrograph is a crucial water source for about 40 million people. Snowmelt from alpine and subalpine snowpack contributes substantially to groundwater recharge and river flow. However, the dynamics of snowmelt progression are not well under...
Hydrological processes in high-elevation catchments are strongly influenced by alternating snow accumulation and melt in addition to summer rainfall. Although diverse water sources and flow paths that generate streamflow in the world's water towers emerge from these two driving inputs, a detailed process understanding remains poor. We measured a co...
In ice‐covered lakes, near‐bottom oxygen concentration decreases for most of the wintertime, sometimes down to the point that bottom waters become hypoxic. Studies insofar have reached divergent conclusions on whether climate change limits or reinforces the extent and duration of hypoxia under ice, raising the need for a comprehensive understanding...
Hydrological processes in high elevation catchments are largely influenced by snow accumulation and melt, as well as summer rainfall input. The use of the stable isotopes of water as a natural tracer has become popular over recent years to characterize water flow paths and storage in such environments, in conjunction with electric conductivity (EC)...
Spatial rainfall patterns exert a key control on the catchment-scale hydrologic response. Despite recent advances in radar-based rainfall sensing, rainfall observation remains a challenge, particularly in mountain environments. This paper analyzes the importance of high-density rainfall observations for a 13.4 km2 catchment located in the Swiss Alp...
Estimation of young water fractions (Fyw), defined as the fraction of water in a stream younger than approximately 2 – 3 months, provides key information for water resource management in catchments where runoff is dominated by snowmelt. Knowing the average dependence of summer flow on winter precipitation is essential context for comparing regional...
Spatial rainfall patterns exert a key control on the catchment scale hydrologic response. Despite recent advances in radar-based rainfall sensing, rainfall observation remains a challenge particularly in mountain environments. This paper analyzes the importance of high-density rainfall observations for a 13.4 km2 catchment located in the Swiss Alps...
In snow-influenced catchments around the world, snowmelt is more efficient at recharging groundwater than rainfall. As climate warms, more precipitation is expected to fall in the form of liquid rain than as solid snow. The future accumulated snowpacks will melt earlier and more often, resulting in shallower snowpacks that are more ephemeral, i.e....
The last century of hydrological research has led to significant improvements in rainfall-runoff modeling with improved representation of the different hydrological processes occurring within a catchment. However, there has not been a significant rise in the number of hydrometeorological variables monitored within a catchment. Consequently, hydrolo...
Tracers have been used for over half a century in hydrology to quantify water sources with the help of mixing models. In this paper, we build on classic Bayesian methods to quantify uncertainty in mixing ratios. Such methods infer the probability density function (pdf) of the mixing ratios by formulating pdfs for the source and target concentration...
A number of recent studies have suggested that snow-dominated catchments experience disproportionally higher groundwater recharge from snowmelt than rainfall. However, the mechanism of this phenomenon is unknown but critical to uncover, given that climate warming will increase the quantity of rainfall relative to that of snowfall. In this work, we...
Stable isotopes of water have been used for over half a century to quantify the amount of groundwater recharge that comes from rainfall vs snowmelt. Classically, this has been done by solving a linear equation with one unknown variable, which in this case is snow fraction. In order to improve the reliability of the estimates of snow fraction, Bayes...
Mountainous regions are often considered as water towers with above average precipitation and seasonal storage under a solid form. This water is a paramount resource during spring and summer for natural ecosystems but also many human activities. Due to its high spatio-temporal variability, defining the precipitation over an entire catchment is stil...
The Young Hydrologic Society (YHS) is a grassroots initiative to stimulate the interaction and active participation of early career hydrologists within the hydrological sciences community and beyond. Our vision is to reform hydrologic community towards a more active and inclusive involvement of early career hydrologists. YHS mission is to “connect”...
Precipitation which once fell as snow is predicted to fall more often as liquid rain now that climate is, and continues, warming. Within snow dominated areas, preferential winter groundwater recharge has been observed, however a shorter winter season and smaller snow fraction results in earlier snowmelt and thinner snowpacks. This has the potential...
The Hydrology Section Student Subcommittee, H3S, is dedicated to a number of ideas and issues within the geosciences complementary to those highlighted by the larger Hydrology Section. We strive to provide student members with opportunities for professional development as well as social interaction and networking within the broader geosciences comm...
The Young Hydrologic Society (YHS) is a bottom-up initiative to catalyze the interaction and active participation of young hydrologists within the hydrological science community and beyond. The first five years of YHS have progressively cultivated many inspiring accomplishments which led to a connected science community for early-career hydrologist...
Snowfall may have different stable isotopic compositions compared to rainfall, allowing its contribution to potentially be tracked through the hydrological cycle. This review summarizes the state of knowledge of how different hydro-meteorological processes affect the isotopic composition of snow, and, through selected examples, discusses how stable...
Last couple of decades have seen the outburst of a number of satellite based precipitation products with Tropical Rainfall Measuring Mission (TRMM) as the most widely used for hydrologic applications. Transition of TRMM into Global Precipitation Mission (GPM) promises enhanced spatio-temporal resolution along with upgrades in sensors and rainfall e...
Increasing frequency of hydrologic extremes in a warming climate call for the development of reliable flood forecasting systems. The unavailability of meteorological parameters in real-time, especially in the developing parts of the world, makes it a challenging task to accurately predict flood, even at short lead times. The satellite-based Tropica...
High resolution satellite precipitation products such as Tropical Rainfall Measuring Mission (TRMM), Climate Forecast System Reanalysis (CFSR), European Centre for Medium-Range Weather Forecasts (ECMWF), etc., offer a promising alternative to flood forecasting in data scarce regions. At the current state-of-art, these products cannot be used in the...
The Chesapeake Bay watershed encompasses parts of six states – Delaware, Maryland, New York, Pennsylvania, Virginia and West Virginia – and the entire District of Columbia, stretching across 166,000 square kilometers, with more than 150 rivers and streams and 17 million people in the watershed. The Chesapeake Bay watershed loses 100 acres of forest...
Climate change will affect the hydrologic budget in the Chesapeake Bay watershed. Future changes in
temperature and precipitation distribution will affect water budget components such as groundwater
flow, evapotranspiration (ET), and runoff. Understanding changes to the hydrologic budget caused byclimate change is vital in properly managing water r...
