Nagaraju Chilukoti

• Ph.D
• Assistant Professor at National Institute of Technology Rourkela

Changing climate has substantially altered the spatio-temporal rainfall pattern, especially over the Indian subcontinent where the Indian Summer Monsoon (ISM) predominates from June to September. This study explores the changes in the rainfall variability over Northern India (NI) for the period 1981–2020 and this region exhibits topographic diversi...

Glacial earthquakes, which are primarily linked to the iceberg calving process, occur more frequently in polar regions with large ice masses. These events are triggered by the sudden movement of glaciers or ice sheets and are highly sensitive to climatic forces. This study focuses on the seasonal and inter-annual patterns of glacial earthquakes fro...

This study provides comprehensive analysis on the contrasting effects caused by the 1997 and 2015 historical El Nino ˜ events linked with the Indian Summer Monsoon (ISM) rainfall. The presence of strong southeast-northwest oriented cold Sea Surface Temperature (SST) anomalies during 1997, that spatially extended from southwest Pacific to Southeast...

The analysis reveals that the occurrence of summer Monsoon Depressions (MDs) over the North Arabian Sea is doubling during 2001–2022 compared to the 1981–2000 period. This increase stems from changes in the region’s dynamic and thermodynamic conditions. The heightened genesis potential parameter with sea surface temperature and moisture flux transp...

This study investigates changes in rainfall patterns over Northwest India (NWI) and the warming of the Northwestern Arabian Sea (NWAS) since 2000. These changes are attributed to the Silk Road Pattern (SRP) phase change in the late 1990s. The SRP positive phase triggers geostrophic deformation over the Tibetan Plateau (TP) by inducing an anomalous...

The concentrations of atmospheric pollutants are a serious concern due to their adverse impacts on human health. The ventilation coefficient (VC) is an indicator that measures the dispersion capacity of air pollutants (air pollution potential) in the atmosphere, providing insights into air quality. In this study, we aim to investigate the spatio-te...

Historically, El Niño events have consistently signalled below-average monsoon rainfall in India excluding years like 1997. Despite 2023 being an El Niño year, India experienced normal monsoon seasonal rainfall (-6% of the Long Period Average: LPA) with above-average rainfall (+ 13% of LPA) during July and September but unadorned deficit rainfall i...

Interannual variability of summer monsoon depressions (MDs) over the Bay of Bengal (BoB) is investigated with special emphasis on developing and decaying El Niño phases during the period 1979–2020. Previous studies have overlooked the relationship between MDs frequency and El Niño phenomena, despite of their stronger association with Indian Summer...

Summer monsoon rainfall over India depends on synoptic-scale phenomena like lows and depressions. India's summer monsoon season 2020 saw above-average rainfall. North Indian Ocean had 12 LPAs in summer 2020 in JJAS season. This monsoon season has the highest all-India rainfall since 1976 in August 2020. 50% of seasonal LPAs emerged in August 2020,...

The seasonal summer monsoon rainfall over India has substantially depended on the synoptic-scale systems such as monsoon lows and depressions. India has received above-average rainfall during the 2020 summer monsoon season. Total 12 Low Pressure Areas (LPAs) formed in the north Indian Ocean during summer 2020 (in JJAS season). The significance of t...

The present study investigates the variability of surface ozone (O3) and its precursors (NOX, CO) at different time scales for 3-year period (2016–2018) using continuous ground-based observations from 25 stations located within the Indian Capital Delhi (28.83°N, 77.81°E). Observations indicate that there is a clear spatial heterogeneity and seasona...

Land use and land cover change (LULCC) is one of the most important forcings affecting climate in the past century. This study evaluates the global and regional LULCC impacts in 1950-2015 by employing an annually updated LULCC map in a coupled land-atmosphere-ocean model. The difference between LULCC and control experiments shows an overall land su...

Earlier studies of land use land cover change (LULCC) normally used only a specified LULCC map with no interannual variations. In this study, using an Atmospheric General Circulation Model (AGCM) coupled with a land surface model, biophysical impacts of LULCC on global and regional climate are investigated by using a LULCC map which covers 63 years...

In this work, we evaluate the upper tropospherichumidity (UTH) in a regional atmospheric model in conjunction with remote sensing observations and reanalysis products during the Indian summer monsoon (ISM). We performed continuous Weather Research and Forecast (WRF) model simulations from 1st May to 1st October for every year during 2001 to 2011 at...

Using observed and reanalysed data sets, we investigate the potential role of Atlantic Multi‐decadal Oscillations (AMO) in weakening the in‐phase association between Indian summer monsoon rainfall (ISMR) and following Australian summer monsoon rainfall (ASMR) during the 1932–1966 period. This weakened inter‐monsoon link was earlier attributed to a...

Using observed and reanalysed data sets, we investigate the potential role of Atlan- tic Multi-decadal Oscillations (AMO) in weakening the in-phase association between Indian summer monsoon rainfall (ISMR) and following Australian sum- mer monsoon rainfall (ASMR) during the 1932–1966 period. This weakened inter- monsoon link was earlier attributed...

Ocean–met observations from INCOIS real-time automatic weather station on-board a ship RV Kaustubh served as strong ground truth for satellite-and model-derived forecasts during the very severe cyclonic storm Hudhud, which made a landfall at Visakha-patnam, India. The ship recorded maximum wind speed of 204 km/h (with a minimum central pressure of...

A coupled regional atmosphere–ocean modeling system is developed using the existing regional models WRF (Weather Research and Forecasting) and ROMS (Regional Ocean Modeling System) to study the influence of air–sea interactions on the simulation of the Indian summer monsoon (ISM). The two-way coupled regional model exchanges heat fluxes from atmosp...

In this study, we investigate a long-term modulation in the relationship between Indian summer monsoon rainfall with the subsequent Australian summer monsoon rainfall. The two monsoon rainfall time series are significantly correlated at 0.3 at the 99 % confidence level. However, the relationship weakens during the 1932–1966 period, with the inter-m...

The performance of a triple-nested mesoscale atmospheric model (MM5) implemented in the Online Nuclear Emergency Response System (ONERS) at Kalpakkam on southeast coast of India is evaluated. Real-time atmospheric model predictions are used to compute radiological plume dispersion in the mesoscale ranges using Lagrangian particle models. About 280...

Satellite Remote Sensing data and spatially generated field observations provide crucial parameters in numerical atmospheric models to define realistic surface boundary conditions. In this study two important parameters i.e., vegetation and soil categories are generated for application in the PSU/NCAR mesoscale model MM5 for realistic representatio...

A mesoscale atmospheric model PSU/NCAR MM5 is used to provide operational weather forecasts for a nuclear emergency response decision support system on the southeast coast of India. In this study the performance of the MM5 model with assimilation of conventional surface and upper-air observations along with satellite derived 2-d surface wind data f...