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Land water loss causes sea level rise in 21st century

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01 Apr, 2025

This post was originally published on Sustainability Matters

An international team of scientists, led jointly by The University of Melbourne and Seoul National University, has found global water storage on land has plummeted since the start of the 21st century, overtaking glacier melt as the leading cause of sea level rise and measurably shifting the Earth’s pole of rotation.

Published in Science, the research combined global soil moisture data estimated by the European Centre for Medium-Range Weather Forecast (ECMWF) Reanalysis v5 (ERA5), global mean sea level measurements and observations of Earth’s pole movement in order to estimate changes in terrestrial (land) water storage (TWS) from 1979 to 2016.

“The study raises critical questions about the main drivers of declining water storage on land and whether global lands will continue to become drier,” University of Melbourne author Professor Dongryeol Ryu said.

“Water constantly cycles between land and oceans, but the current rate of water loss from land is outpacing its replenishment. This is potentially irreversible because it’s unlikely this trend will reverse if global temperatures and evaporative demand continue to rise at their current rates. Without substantial changes in climate patterns, the imbalance in the water cycle is likely to persist, leading to a net loss of water from land to oceans over time.”

Between 2000 and 2002, soil moisture decreased by around 1614 gigatonnes (1 Gt equals 1 km3 of water) — nearly double Greenland’s ice loss of about 900 Gt in 2002–2006. From 2003 to 2016, soil moisture depletion continued, with an additional 1009 Gt lost.

Soil moisture had not recovered as of 2021, with little likelihood of recovery under present climate conditions. The authors say this decline is corroborated by independent observations of global mean sea level rise (~4.4 mm) and Earth’s polar shift (~45 cm in 2003–2012).

Water loss was most pronounced across East and Central Asia, Central Africa, and North and South America. In Australia, the growing depletion has impacted parts of Western Australia and south-eastern Australia, including western Victoria, although the Northern Territory and Queensland saw a small replenishment of soil moisture.

Image credit: iStock.com/ZU_09

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ABB receives EPD status for gearless mill drive ring motor

ABB receives EPD status for gearless mill drive ring motor

ABB has gained Environmental Product Declaration (EPD) status for its Gearless Mill Drive (GMD) ring motor — technology used to drive large grinding mills in the mining industry.

An EPD is a standardised document that provides detailed information about the environmental impact of a product throughout its life cycle. Based on a comprehensive Life Cycle Assessment (LCA) study, the EPD highlights ABB’s commitment to transparency, environmental responsibility and supporting customers in making informed decisions on sustainability in their supply chains.

ABB analysed the environmental impact of a ring motor across its entire life cycle from supply chain and production to usage and end-of-life disposal. The study was conducted for a ring motor of a semi-autogenous grinding (SAG) mill with an installed power of 24 MW and was based on a reference service life of 25 years.

“Sustainability is at the core of our purpose at ABB, influencing how we operate and innovate for customers,” said Andrea Quinta, Sustainability Specialist at ABB. “By earning the Environmental Product Declaration for our ring motor, we emphasise our environmental stewardship and industry leadership for this technology. We adhered to the highest standards throughout this process, as we do in the ABB Ring Motor factory every day. This recognition highlights to the mining industry what they are bringing into their own operations when they work with ABB.”

The comprehensive LCA was conducted at ABB’s factory in Bilbao, Spain, and was externally verified and published in accordance with international standards ISO 14025 and ISO 14040/14044. It will remain valid for five years.

The ring motor, a key component of the GMD, is a drive system without any gears where the transmission of the torque between the motor and the mill is done through the magnetic field in the air gap between the motor stator and the motor rotor. It optimises grinding applications in the minerals and mining industries by enabling variable-speed operation, leading to energy and cost savings.

The full EPD for the ABB GMD Ring Motor can be viewed on EPD International.

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