A5070446990- Climate variability and models
- Hydrology and Drought Analysis
- Meteorological Phenomena and Simulations
- Tropical and Extratropical Cyclones Research
- Climate change impacts on agriculture
- Plant Water Relations and Carbon Dynamics
- Flood Risk Assessment and Management
- Oceanographic and Atmospheric Processes
- Tree-ring climate responses
- Hydrology and Watershed Management Studies
- Agricultural risk and resilience
- Ocean Waves and Remote Sensing
- Precipitation Measurement and Analysis
- Arctic and Antarctic ice dynamics
- Cryospheric studies and observations
- Science and Climate Studies
- Municipal Solid Waste Management
- Coastal and Marine Dynamics
- Solar Radiation and Photovoltaics
- Plant Ecology and Soil Science
- Rangeland and Wildlife Management
- Remote Sensing in Agriculture
- Disaster Management and Resilience
- Hydrological Forecasting Using AI
- Atmospheric and Environmental Gas Dynamics
Indian Institute of Technology Dhanbad
2022-2024
Helmholtz Centre for Environmental Research
2019-2022
Universitäres Zentrum für Zahnmedizin Basel
2021
Indian Institute of Technology Bombay
2013-2020
University of Iowa
2019-2020
Manipal Academy of Higher Education
2017
Abstract Since the spring 2018, a large part of Europe has been in midst record-setting drought. Using long-term observations, we demonstrate that occurrence 2018–2019 (consecutive) summer drought is unprecedented last 250 years, and its combined impact on growing season vegetation activities stronger compared to 2003 European suite climate model simulation outputs, underpin role anthropogenic warming exacerbating future risk such consecutive event. Under highest Representative Concentration...
During the period 2018–2020, Europe experienced a series of hot and dry weather conditions with significant socioeconomic environmental consequences. Yet, extremity these multi-year is not recognized. Here, we provide comprehensive spatio-temporal assessment drought hazard over by benchmarking past exceptional events during from 1766 to 2020. We identified 2018–2020 event as new benchmark having an unprecedented intensity that persisted for more than 2 years, exhibiting mean areal coverage...
India's agricultural output, economy, and societal well-being are strappingly dependent on the stability of summer monsoon rainfall, its variability extremes. Spatial aggregate intensity frequency extreme rainfall events over Central India significantly increasing, while at local scale they spatially non-uniform with increasing spatial variability. The reasons behind such increase in extremes poorly understood trends mean have been greatly overlooked. Here, by using multi-decadal gridded...
Abstract Spatially aggregated extreme rainfall over India shows an increasing trend the last 50 years of 20th century, while fine‐resolution analysis reveals a spatially nonuniform trend. Analysis 104 (1901–2004) precipitation at 1° resolution, using Extreme Value Theory, that post‐1950 characteristics (intensity, duration, and frequency) their trends are significantly different from those before 1950, with spatial nonuniformity. Majority locations in have extremes sign as compared to...
Compound extremes pose immense challenges and hazards to communities, this is particularly true for compound hydrometeorological associated with deadly floods, surges, droughts, heat waves. To mitigate better adapt extremes, we need understand the state of knowledge such extremes. Here review current advances in understanding extremes: wave drought (hot-dry), stress extreme precipitation (hot-wet), cold-wet, cold-dry flooding. We focus on drivers these methods used investigate quantify their...
Abstract Flash droughts are caused by a rapid depletion of soil moisture, and they severely affect vegetation growth agricultural production. Notwithstanding the growing importance flash under warming climate, drivers across Europe not well understood. Here we estimate changes in characteristics using ERA5 reanalysis dataset for 1950–2019 period. We find substantial increase frequency spatial extent (with 79% total area) during season with at-least one fourth domain showing two-fold recent...
Abstract The intensification of precipitation extremes in a warming world has been reported on global scale and is traditionally explained with the Clausius-Clapeyron (C-C) relation. relationship observed to be valid mid-latitudes; however, debate persists tropical monsoon regions, Indian Summer Monsoon Rainfall (ISMR) being prime example. Here, we present comprehensive study dependence ISMR both 2 m surface air temperature over India sea Ocean. Remarkably, exhibit no significant association...
Abstract Global and local environmental changes are likely to introduce nonstationarity in the characteristics of Indian Summer Monsoon Rainfall (ISMR) extremes. Here we perform a nonstationary frequency analysis on ISMR extremes Generalized Additive Model for Location, Scale Shape framework with cluster 74 models, considering different possible combinations. Interestingly, observe significant urbanizing/developing‐urban areas (transitioning from rural urban), compared completely urbanized...
Abstract Since 2002, there has been a clear increase in Indian summer monsoon rainfall (ISMR). We demonstrate that this is associated with change the dynamics of Intertropical Convergence Zone (ITCZ). Using recently released reanalysis product from 1980–2016, we show ITCZ strengthened and propagated northward since 2002. Analysis total energy budget reveals an divergence atmospheric diabatic heating, which consistent changes ITCZ. Although global aerosol optical depth shows significant...
Abstract The impacts of hazard events such as extreme rainfall, heatwaves, and droughts are substantial represent an increasing threat over India. Effective adaptations to these hazards require in-depth understanding their physical socioeconomic drivers. While characteristic models have been substantially improved, compelling evidence the spatio-temporal analysis social vulnerability (SoV) throughout India still lacking. Here, we provide first SoV disasters at a national-scale for past two...
Abstract Increased occurrence of heatwaves across different parts the world is one characteristic signatures anthropogenic warming. With a 1.3 billion population, India hot spots that experience deadly during May-June – yet large-scale physical mechanism and teleconnection patterns driving such events remain poorly understood. Here using observations controlled climate model experiments, we demonstrate significant footprint far-reaching Pacific Meridional Mode (PMM) on heatwave intensity...
Due to global warming, climate extremes like heatwave events will rise further in the 21st century. Earlier, characteristics duration, intensity, and frequency have been studied independently, ignoring interdependence among them, leading biases impact assessment. The intensity duration frequency(HIDF) model provides a feasible framework incorporating interdependencies characteristics, helping quantify hazards more accurately. HIDF curves are produced for six metropolitan cities, namely,...
Tropical cyclone-related losses are projected to increase globally due climate change and socio-economic factors, with storm surges posing a significant threat coastal regions. Enhanced preparedness among populations is essential reduce the impact of this trend. This study evaluates surge hazards risks using multi-attribute decision-making method develops risk maps based on empirical data. The integration hazard, vulnerability, exposure indices highlights eastern coast (Bay Bengal) as region...
ABSTRACT India is a major agrarian country strongly impacted by spatio‐temporal variations in the Indian monsoon. The impact assessment usually accomplished implementing projections from general circulation models (GCMs). Unfortunately, these cannot capture dynamicity of monsoon and require either statistical (SD) or dynamical (DD) downscaling GCM to finer resolution. Both techniques can variation climatic variables but are marred uncertainty resulting choice method, which affects climate...
Abstract Indian agriculture is globally well-documented to reflect the impacts of changing climate significantly. However, adaptation efforts are often hindered due inadequate assessment coupled human-environment interactions. In this study, we propose a novel unified country-level framework quantify decadal agricultural risks derived from multiple hydro-meteorological exposures and adaptive consequences. We identify, for first time, that rice wheat have increased in recent decade, with at...
Abstract The fast depletion of soil moisture in the top layers characterizes flash drought events. Due to their rapid onset and intensification, droughts severely impact ecosystem productivity. Thus understanding initialization mechanisms is essential for improving skill forecasting systems. Here, we examine role antecedent meteorological conditions that lead across Europe over last 70 years (1950–2019) using ERA5 dataset. We find two major flash-drought types based on a sequence development...