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Geodesy

Bramha Dutt Vishwakarma

Bramha is an Assistant Professor at the Indian Institute of science (IISc), India. He is working on understanding the changes in the Earth system due to climate change and direct human interventions. He did his PhD in Geodesy from University of Stuttgart and then moved to University of Bristol as a research postdoc and then a research fellow. He joined IISc in 2021 and is leading a group: Geodesy for Earth system science.

Combining GRACE and Kalman filter to get superior evapotranspiration estimates

, and October 25, 2024
Combining GRACE and Kalman filter to get superior evapotranspiration estimates
(source: Getty/Oleh_Slobodeniuk)

Knowledge gaps in our understanding of the Hydrological Cycle  The water cycle continuously provides us with fresh water.  A critical process in the water cycle is evapotranspiration (ET), meaning that water evaporates from the surface and transpires from plants into the atmosphere. ET plays a crucial role in climate stability and the regulation of global water resources, but it is one of the most ...[Read More]

High resolution terrestrial water storage changes from combination of GRACE and models

, and February 7, 2024
High resolution terrestrial water storage changes from combination of GRACE and models
Image credits: Jakob Keck (distributed via imaggeo.egu.eu)

The Gravity Recovery and Climate Experiment (GRACE) satellite mission (2002-2017) consisted of two satellites at ~500 km altitude separated by 200 km, following each other in the same orbit. The distance between the two GRACE satellites changes because of the gravitational pull of the masses beneath the satellites. As such, mass changes at or near the Earth’s surface caused variations in the dista ...[Read More]

Calculating postglacial sea-level change within few seconds: a statistical emulator for GIA

, and December 22, 2023
Calculating postglacial sea-level change within few seconds: a statistical emulator for GIA
Figure 1. Map of the global ice sheet and topography during the Last Glacial Maximum. Areas with dark green colour indicate land created by sea-level lowering. Figure courtesy of J. Austermann; Dendy et al., 2017.

Sea-level change serves as a direct indicator of climate change with profound implications for coastal areas. Since 1900, the global mean sea level (GMSL) has risen over 20 cm, leading to beach erosion, delta inundation, and increased flooding worldwide. Over glacial cycles spanning tens of thousands of years, interactions between ocean and continental-scale ice sheets can cause GMSL to fluctuate ...[Read More]