Global ice sheets melting at 'worst-case' rates: UK scientists

27 Janvier, 2021, 16:16 | Auteur: Therese Cote
  • Earth Is Losing Ice Faster Today Than In The Mid-1990s Study

Annually, the melt rate is now about 57% faster than it was three decades ago, scientists report in a study published Monday in the journal The Cryosphere.

Dr. Slater says the study is the first of its kind to analyze ice disappearing using satellite observations.

The rate of loss has risen from 0.8 trillion tonnes per year in the 1990s to 1.3 trillion tonnes per year by 2017, with potentially disastrous consequences for people living in coastal areas.

"Although every region we studied lost ice, losses from the Antarctic and Greenland ice sheets have accelerated the most".

Global ice loss from all measured locations on the planet is occurring at the worst-case scenario pace.

Greenland's melting glaciers, which plunge into Arctic waters via steep-sided inlets, or fjords, are among the main contributors to global sea level rise in response to climate change.

"Over the past three decades there's been a huge worldwide effort to understand what's happening to individual components in Earth's ice system, revolutionized by satellites which allow us to routinely monitor the vast and inhospitable regions where ice can be found", lead study author Thomas Slater said in a news release.

He adds that over the past 3 decades, global efforts have been made to better understand the individual components of the planet's ice systems.

Marine Le Pen en tête au 1er tour — Présidentielles françaises
Selon ce sondage Marine le Pen , Présidente du Rassemblement national , obtiendrait ainsi de 26% à 27% des suffrages exprimés.

West Brom 0-5 Man City: Citizens go top of the league_china
Following the win, City reached the top of the Premier League table, becoming the ninth different side to do so this season. They are now on a 10-match winning run across all competitions and will want to extend on that run.

Wade Cut From Australia Test Squad For South Africa Series
The tours are expected to be held concurrently in March, although there hasnt been confirmation of the schedule for test series. Hohns said the T20 squad was created to give players a chance to push for selection at the 2021 T20 World Cup.

The paper mentions that loss was suffered by Arctic sea ice that is 7.6 trillion tonnes, Antarctic ice shelves with 6.5 trillion tonnes, mountain glaciers with 6.1 trillion tonnes, the Greenland ice sheet at 3.8 trillion tonnes, the Antarctic ice sheet 2.5 trillion tonnes, and Southern Ocean sea ice have all decreased in mass. At the edges of Greenland, the vast glaciers extending from the ice sheet travel slowly down valleys like icy conveyor belts, which pour into the fjords and then melt or break off (or calve) as icebergs. In total, these losses contributed 1.37 inches to sea level rise. White ice helps in reflecting solar radiation into space, maintaining the planet's temperature. The loss has been mainly observed from the polar ice sheets in Antarctica and Greenland that have melted drastically. And incremental but quickening sea level rise can play out in dramatic fashion when hurricanes roar ashore, pushing storm surge farther inland thanks to the climate change-driven boost.

For much of the 20th century, sea levels rose annually by some 1.4 millimeters a year.

This means that as ice shrinks, more solar energy is being stored on Earth causing the Arctic to warm faster than elsewhere on the planet.

The data collected suggests that half of all losses were from ice on land.

Scientific efforts to understand and predict sea level rise have largely focused on polar ice sheets, but mountain glaciers are disappearing at alarming rates.

It is forecasted that for every centimetre of sea-level increase, around a million people risk becoming displaced from low-lying homelands.

This data complements other surveys of the region - including OMG measurements via boat (which began in 2015) and observational data collected from the Landsat satellites from NASA and the U.S. Geologic Survey - and builds on a growing body of glacier research on ice-ocean interactions. "The retreat of glaciers around the world is therefore of crucial importance, at both local and global scales", Inès Otosaka, co-author of the study told the Guardian.

While the ice loss from the northern hemisphere was 58 per cent, the southern hemisphere lost 42 per cent ice.

Conseillé:



Populaire

Elderly Spanish woman who 'died' of COVID shows up at nursing home
Due to coronavirus protocols, they were unable to attend. "I could not believe it", her husband told the paper. The foundation did not immediately respond to a request from Reuters for comment.

Chaos ensues as protesting farmers breach barricades, police use tear gas
Singh said he was ready to hold talks with the government on legislation guaranteeing a minimum support price for wheat and rice. Police baton charged farmers at Chintamani Chowk in Shahdara when they broke barricades and smashed window panes of cars.

La terrible accusation d'agression sexuelle d'Asia Argento — Fast and furious
Cohen nie catégoriquement l'accusation d'agression sexuelle totalement fausse lancée contre lui par Asia Argento ". A l'époque, je ne savais pas ce que c'était. " Je me suis réveillée le matin nue dans son lit ", a-t-elle confié.

Hamilton boss blames 'upsets' in online meetings for contract delays
Hamilton's previous £40million-a-year deal with the sport's all-conquering team expired on the final day of December. We don't make life easy for them, of course, when we both argue over Zoom and keep sending curveballs to the lawyers.

Saurav Ganguly admitted to hospital again after chest pain complaints
He had undergone angioplasty for the same, and was discharged from the hospital on January 7. He thanked all the doctors and support staff for taking care of him.

Bug Cyberpunk 2077 avec la quête Takemura : voici comment l’éviter
Sur Xbox, l'utilisation de la mémoire dans différents sous-systèmes a été améliorée pour améliorer l'optimisation globale du jeu . Correction d'un problème où Delamain restait silencieux tout au long Épistrophie si le joueur a initialement refusé de l'aider.

Nigerian Service Chiefs resign
The new service chiefs took over from the ex-service chiefs -General Abayomi Gabriel Olonisakin ( Chief of Defence Staff); Lt. Presido Buhari congratulate di outgoing Service Chiefs on efforts to bring enduring peace to di kontri.

Covid-19 : Sanofi va aider Pfizer-BioNTech à produire son vaccin
En outre, Sanofi prévoit de débuter au premier trimestre 2021 une étude de phase I/II sur le vaccin à ARNm qu'il développe en partenariat avec Translate Bio.

Justin Timberlake worries about how his fame will affect his children
Justin and Dax both agreed that they were concerned that it would be hard for the kids to make real friendships due to their fame.

Semien, Blue Jays agree to $18M, 1-year contract
The Brewers may have been involved , but it's the Blue Jays who ultimately land free agent shortstop Marcus Semien . Semien hit.223 with seven homers, 23 RBIs and.679 OPS in 53 games last season, his sixth with Oakland.