Geodesy

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

Khosro Ghobadi-Far, edited by Öykü Koç and Bramha Dutt Vishwakarma February 7, 2024

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]

Bits and Bites of Geodesy — Where is the centre of the Earth? Why do we care?

Marius Schlaak and edited by Bene Aschenneller January 19, 2024

Figure courtesy: Öykü Koç

We introduce you to our new blog series Bits & Bites of Geodesy. In this blog post series, we aim to communicate small chunks of geodetic fun facts that are easy to digest. In short, posts meant for everyone, facts about geodetic measurement techniques, challenges, and concepts are presented. These bite-sized articles will unravel the often-overlooked details and intricate aspects of geodetic ...[Read More]

Geodesy Division Year In Review 2023

Öykü Koç and edited by Rebekka Steffen January 9, 2024

Hi EGU Community! We hope that you had some rest during the holidays and are ready for this new year ahead! With the first blog post of 2024, we want to look back at what happened in the G Division during the last year and give an outlook on what you can expect for the coming year! Looking back on 2023 Over the past year, we published a total of 20 blog posts. We introduced a new series in Februar ...[Read More]

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

Yucheng Lin, edited by Marius Schlaak and Bramha Dutt Vishwakarma December 22, 2023

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]