Dr. Usha K Hasyagar
Climate Science & Earth System Modelling

Dr. Usha K Hasyagar

डॉ. उषा के. हास्यागार
Scientist — CSIR Fourth Paradigm Institute (CSIR-4PI), Bengaluru
Assistant Professor — Academy of Scientific and Innovative Research (AcSIR)
usha.4pi@csir.res.in
Focus Areas

Research Interests

Climate Modelling (CESM · WRF · RegCM) Aerosol–Climate Interaction Air Quality Modelling Monsoon Simulation & Variability Land–Atmosphere Coupling Cryosphere-Climate Feedbacks Solar Radiation Management(SRM) Quantum Computing
Career

Experience

Jul 2025
– Present
Assistant Professor Academy of Scientific and Innovative Research (AcSIR)
Apr 2025
– Present
Scientist - C CSIR Fourth Paradigm Institute (CSIR-4PI), Bengaluru
May 2024
– Apr 2025
Assistant Professor Atria University, Bengaluru
May 2023
– Apr 2024
Project Scientist I Indian Institute of Science (IISc), Bengaluru
Jul 2018
– Jun 2021
Senior Research Fellow (SRF) Space Physics Laboratory, Vikram Sarabhai Space Centre (VSSC), Thiruvananthapuram
Jun 2016
– Jun 2018
Junior Research Fellow (JRF) Space Physics Laboratory, Vikram Sarabhai Space Centre (VSSC), Thiruvananthapuram
Peer-reviewed Research

Publications

Sensitivity of the global hydrological cycle to the altitude of stratospheric sulphate aerosol layer
K. H. Usha, Govindasamy Bala, Anu Xavier
Environmental Research Letters 2024 Vol. 19, No. 8, p. 084024
An investigation of the relationship between tropical monsoon precipitation changes and stratospheric sulfate aerosol optical depth
Anu Xavier, Govindasamy Bala, Shinto Roose, Usha K H
Oxford Open Climate Change 2024 Vol. 4, Issue 1, kgae016
Elevation-dependence of warming due to aerosol-induced snow darkening over the Himalayan-Tibetan region
Vijayakumar S. Nair, K. H. Usha, S. Suresh Babu
Environmental Research Letters 2024 Vol. 19, No. 1, p. 014049
Effects of atmospheric aerosols on heat stress over South Asia
Parottil Ajay, Vijayakumar S. Nair, S. Suresh Babu, Chiranjit Das, Usha K H
Environmental Research: Climate 2023 Vol. 2, No. 4, p. 045007
Deciphering the role of aerosol-induced snow albedo feedback on dust emission over the Tibetan Plateau
K. H. Usha, Vijayakumar S. Nair, S. Suresh Babu
Journal of Geophysical Research: Atmospheres 2022 doi: 10.1029/2021JD036384
Effects of aerosol-induced snow albedo feedback on the seasonal snowmelt over the Himalayan region
K. H. Usha, Vijayakumar S. Nair, S. Suresh Babu
Water Resources Research 2022 doi: 10.1029/2021WR030140
Effect of aerosol-induced snow darkening on the direct radiative effect of aerosols over the Himalayan region
K. H. Usha, Vijayakumar S. Nair, S. Suresh Babu
Environmental Research Letters 2021 Vol. 16, No. 6, p. 064004
Amplification of South Asian haze by water vapour–aerosol interactions
V. S. Nair, F. Giorgi, U. Keshav Hasyagar
Atmospheric Chemistry and Physics 2020 Vol. 20, pp. 14457–14471
Modeling of aerosol induced snow albedo feedbacks over the Himalayas and its implications on regional climate
K. H. Usha, Vijayakumar S. Nair, S. Suresh Babu
Climate Dynamics 2020 Vol. 54, pp. 4191–4210