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3 cm: the rise in sea level caused by the melting of Greenland and Antarctica

The polar ice caps have contributed a third of the total sea level rise since the 70s, and their melting is accelerating

2 min

thaw — Icebergs in Ilulissat, Greenland. Michel Balada / Getty

Sunday

Info/graphic

Eduard ForrollandSònia Sánchez

28/09/2026 - 07:03 h

Unverified ENG translation

CAT
CAST

The rise in sea level is one of the impacts of the climate crisis that are already irreversible, as warned by the UN. As the oceans warm, the water rises mainly due to a phenomenon of thermal expansion, and to this is added the water poured into them by both melting terrestrial glaciers and continental ice from the poles when it thaws. It is precisely this last cause, the melting of the polar ice caps, that has been accelerating the most in recent years. Now, a new study published in Scientific Data, from the Nature group, offers the most precise portrait obtained to date regarding ice loss in Greenland and Antarctica.

Since the 1970s, these two territories have lost 11.3 trillion tons of ice, and this has caused the sea level to rise by 3.1 centimeters, according to the study conducted by the international team of polar scientists IMBIE, with the support of NASA and the European Space Agency (ESA). This rise is a quarter of the total of approximately 11 centimeters that the sea level has risen in this same period (adding, as we mentioned, the melting of terrestrial glaciers such as those in the Himalayas or Alaska, in addition to the effect of thermal expansion).

+110 mm

Ice loss in Greenland

and Antarctica accounts

for a quarter of all

sea level rise recorded

on the planet. This is 3

centimeters out of a total

of approximately 11 cm

calculated to have risen

since the last century.

+31,49 mm

Three centimeters of sea level rise may seem

insignificant, but it puts between six and nine

million more people at risk of coastal flooding

and erosion, the study authors warn.

+110 mm

Ice loss in Greenland

and Antarctica accounts

for a quarter of all

sea level rise recorded

on the planet. This is 3

centimeters out of a total

of approximately 11 cm

calculated to have risen

since the last century.

+31,49 mm

Three centimeters of sea

level rise may seem

insignificant, but it puts

between six and nine

million more people at risk

of coastal flooding and

erosion, the study authors warn.

+110 mm

Ice loss in Greenland

and Antarctica accounts

for a quarter of all

sea level rise recorded

on the planet. This is 3

centimeters out of a total

of approximately 11 cm

calculated to have risen

since the last century.

+31,49 mm

Three centimeters of sea

level rise may seem

insignificant, but it puts

between six and nine

million more people at risk

of coastal flooding and

erosion, the study authors warn.

Melting polar ice caps

GREENLAND

This large Danish island is the main driver of sea level rise coming from polar ice caps. The accelerated warming of the North Atlantic and the fact that the Arctic is warming four times faster than the global average means that ice melt is higher than at the South Pole.

The red on the map shows the areas where the most ice thickness has been lost: those with a deeper red have lost more than 20 meters

Why do we talk about Greenland and not the entire Arctic? Because the ice on this island–like that of Antarctica–is continental ice, which when it melts pours new water into the sea. The sea ice that covers the North Pole, on the other hand, is already floating on the water and, therefore, its melting does not cause the sea level to rise.

ANTARCTICA

Despite containing the largest ice reserve on the planet, its contribution to sea level rise is slightly lower than that of Greenland. Within the continent, there are varying rates of melting, and the greatest loss is concentrated in the western region.

The red on the map shows the areas where the most ice thickness has been lost: those with a more intense red have lost more than 20 meters

From the glaciers to our coasts

The new study has analyzed satellite data from the last three decades –with software developed by the Catalan company IsardSat– and they have detected the areas that have lost the most ice. Thus, we know that within Antarctica not all regions are melting at the same rate: the one that has poured the most water into the sea has been the western zone, while the Antarctic Peninsula and especially the east of the continent have poured much less.

Evolution of sea level rise

Monthly growth data in millimeters according to thaw source

Antarctica as a whole has raised the sea level by 1.3 cm since 1979, the first year for which data is available. But Greenland, despite being almost seven times smaller, has caused a rise of 1.7 cm since 1971. Both together add up to 3.14 cm since 1979, the year in which data began to be available for both.

84% of ice loss

has occurred in the glaciers

The new study also details that 84% of the ice loss from these two land masses has occurred in glaciers, while only 16% comes from ice that melts on the Earth's surface and ends up in rivers and aquifers. These data confirm that what happens to these large ice masses will be the decisive factor in the advance of the coastline over the coming decades.