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Mauri Pelto @mauri-pelto.bsky.social · 26/09/2026

Ultramarine Glacier, Alaska has had no accumulation zone in 2018, 2019, 2020, 2021, 2022, 2024 and 2026. The lack of a persistent accumulation zone indicates a glacier that cannot survive. The glacier has retreated 2.2 km since 1986. glacierchange.blog/2026/09/26/u...

glacierchange.blog

Ultramarine Glacier Retreat: 1986 to 2026 Landsat Insights

Discover dramatic retreat of Ultramarine Glacier, Alaska losing 2.2 km since 1986. After 2018 it lost all snow cover most years, indicating it can't survive.

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Mauri Pelto @mauri-pelto.bsky.social · 03/09/2026

Berg Lake, Alaska is dammed by Steller Glacier. This large lake 13 km2 drained in late August of 2026 as noted in a series of Landsat images. This drainage was later in the melt season than in 2023, 2024, or 2025. glacierchange.blog/2026/09/03/b...

glacierchange.blog

Berg Lake, Alaska Glacier Dammed Lake Outburst 2026

Berg Lake on Aug. 30th after drainage in this Landsat image. Yellow arrow indicates lake that has changed from dark blue seen in late July indicative of limited glacier input, to a lighter blue ind…

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Mauri Pelto @mauri-pelto.bsky.social · 01/09/2026

Worked on this project with NASA Earth Observatory examining movement of largest iceberg that calved in Northern Hemisphere in 2026. As of Aug. 31 it has moved 110 km from its origin, across and south into Kennedy Channel. #glaciology science.nasa.gov/earth/earth-...

science.nasa.gov

Ice Island Survives Run-In With Joe Island - NASA Science

In summer 2026, a substantial iceberg calved from Petermann Glacier in northwest Greenland and swiftly drifted into Nares Strait, colliding with an island along the way.

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Mauri Pelto @mauri-pelto.bsky.social · 17/08/2026

Petermann Glacier, NW Greenland Iceberg making 3 km/day headway toward open seas. U Ottawa researchers noticed this calving even that took place on Aug 4, 2026. The 75 km2 iceberg (ice island) calving not a surprise, leaves similar sized area in unstable position. glacierchange.blog/2026/08/17/p...

glacierchange.blog

Petermann Glacier, NW Greenland Releases Massive Iceberg in August 2026.

Petermann Glacier in Landsat images from July 21st and Aug. 13 2026. Indicating the rift that leads to iceberg calving of berg A-yellow arrows. Additional significant rifting inidicated by red arro…

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Mauri Pelto @mauri-pelto.bsky.social · 14/08/2026

Worked on Barnes Ice Cap project for NASA Earth Observatory, came out while I was in field. Continued evolution of the ice cap in an era where it does not have a persistent accumulation zone. science.nasa.gov/earth/earth-... #glaciology

science.nasa.gov

A Bare Summer for Barnes Ice Cap - NASA Science

The expanse of glacial ice on Canada’s Baffin Island lost its snow cover quickly and early in summer 2026, revealing a network of melt features.

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Mauri Pelto @mauri-pelto.bsky.social · 30/07/2026

Fieldwork today 7-29-2026 Lower Curtis Glacier terminus and runoff. Terminus front 44m high vs 70 m in 2018. This is our 43rd annual survey here.

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Mauri Pelto @mauri-pelto.bsky.social · 27/07/2026

Tomorrow we begin our 43rd field season observing the response of North Cascade glaciers to climate change. The region will experience another year of significant loss-we will document just how much with science data and art observations. glacierchange.blog/2026/07/23/4...

glacierchange.blog

43rd Field Season of North Cascade Glacier Climate Project

Lower Curtis Glacier terminus in 2025 with overall results of our work 1984-2025. 2026 Field Season: For the 43rd consecutive summer we are heading into the field to measure and communicate the imp…

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Mauri Pelto @mauri-pelto.bsky.social · 13/07/2026

I collaborated with Seattle Times Climate Lab on the Big Four Ice Caves looking at the ice and the biota of this unique location. In June 2026 it is the smallest for early summer in the last 50+ years. It may not survive the summer. #glaciology www.seattletimes.com/seattle-news...

seattletimes.com

Hunting for rare plants in the fragile ecosystem of Big Four's Ice Caves

The caves northeast of Seattle are succumbing to the Pacific Northwest’s hotter, drier summers and winters with dwindling snowpack.

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Mauri Pelto @mauri-pelto.bsky.social · 06/07/2026

Hovgard Kystland Glacier, West Greenland retreat accelerated for the 2020-2026 period. The glacier lost 10.5 km2 in area and frontal recession was 2.5 km. The black dots indicate the 2026 terminus and the green dots 2020 on these Sentinel images. glacierchange.blog/2026/07/06/h...

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Mauri Pelto @mauri-pelto.bsky.social · 27/06/2026

Grosser Aletsch Glacier, Switz. has risen rapidly through June from 2450 m on June 11 to 2850 m on June 25, comparable to June 2022 and higher than June 2025 which also had June heat waves. In 2022 the end of summer snow line was a record high 3200 m. #glaciology glacierchange.blog/2026/06/27/g...

glacierchange.blog

Grosser Aletsch Glacier Rapid Snow Loss June 2026

In June of 2025 heat waves combined with limited winter snowpack set the stage for significant glacier loss, 3% of the volume of Swiss Glacier. This followed on the exceptional losses in 2022 and 2…

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Mauri Pelto @mauri-pelto.bsky.social · 25/06/2026

Argentiere Glacier, France has a 400 m snow line rise thus far in June as the ongoing heat wave leads to rapid melt. The snow line is now 100 m the end of summer long term average snow line. glacierchange.blog/2026/06/25/a...

glacierchange.blog

Argentiere Glacier, France Rapid Snow Line Rise June 2026

On June 1, 2026 the snowline is near the terminus of Argentiere Glacier at 2300 m, by June 24, 2026 the snowline has rise upglacier 3.3 km to 2700 m. The French Alps have expereienced a significant…

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Mauri Pelto @mauri-pelto.bsky.social · 23/06/2026

@pbsnews.org focussed on our 42 years of glacier work during the Newshour on June 22, 2026. We have observed in the field the melting and loss of glaciers in the North Cascades. We communicate these changes with art exhibits and science data publication. www.pbs.org/newshour/sho... #glaciology

pbs.org

The scientist and his family tracking melting glaciers for nearly half a century

The world’s glaciers are receding at an alarming rate, losing more than a trillion tons of ice a year. Fueled in part by climate change, it’s driving sea levels higher, which could threaten coastal co...

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Mauri Pelto @mauri-pelto.bsky.social · 14/04/2026

The extensive melt season in recent years have darkened ice surface and expanded lake. In this image high melt rate has increased water level as well in August 2025 False Color Sentinel image.

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Mauri Pelto @mauri-pelto.bsky.social · 09/04/2026

Our mass balance work focussed on glaciers in the North Cascades of Washington all of which lost over 1.5 m of water equivalent thickness.

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Mauri Pelto @mauri-pelto.bsky.social · 06/04/2026

Retreat of Cook Ice Cap oulet glaciers, Kerguelen Island is evident in Landsat images from 2001 (red arrows) to 2025 (yellow dots). This led to lake formation and expansion. Dumont D’Urville Gl.=-1.5 km, Vallot Gl.=-2.4 km, Naumann Gl.=4.0 km, Ampere Gl.=-3.3 km and Diosaz Gl.=-0.8 km. #glaciology

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Reposted by Mauri Pelto

Melaine Le Roy @subfossilguy.bsky.social · 24/03/2026

Perito Moreno 2023 | 2026 For recent mass balance estimate see: www.sciencedirect.com/science/arti... 📷 Landsat scenes via @mauri-pelto.bsky.social

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Mauri Pelto @mauri-pelto.bsky.social · 04/03/2026

Notice extensive thinning leading to lateral retreat denoted by trimlines T1 and T2, in Sentinel images from 2023 and 2026. There is expanded rifting at R. All accompanying the frontal retreat.

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Mauri Pelto @mauri-pelto.bsky.social · 15/02/2026

Glaciar Mayo, in Parque Nacionales Los Glaciares, Argentina, terminus has been pinned on north shore of an arm of Lago Argentino for 40 years. In the last 6 months the terminus has experienced its largest change, 1 km2 of area calving into a Melange (M) & icebergs (I) - Landsat and Sentinel images.

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Mauri Pelto @mauri-pelto.bsky.social · 11/02/2026

We celebrate International Day of Women and Girls in Science as the North Cascade Climate Project expeditions have been mainly powered by women in the last decade. We are artists and scientists, mostly doing both aspects during the field season. Toughness , collaboration and joy is the net result.

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Mauri Pelto @mauri-pelto.bsky.social · 09/02/2026

Jorge Montt Glacier, outlet of Southern Patagonia Icefield has experienced a 2.5 km retreat in last 5 years. Contributions from tributary A-C reduced. Terminus in wider fjord reach providing no pinning point to slow retreat. #climatechange #glaciology

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Mauri Pelto @mauri-pelto.bsky.social · 07/02/2026

A decade of change for glaciers of South Georgia Is. revealed in Landsat images images. Retreat has led to detachment/separation at Twitcher, Risting, Novosilski, Salamon and Hindle Glacier. #climatechange #glaciology glacierchange.blog/2026/02/02/a...

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Mauri Pelto @mauri-pelto.bsky.social · 13/01/2026

Our ability to portray the detailed obs. of velocity on Jakobshavn Glacier in 1985-86 was more limited than the measurements. Contrast Fig. 3 from our paper below to the recent work published by Wuite et al (2025) above. Glacier and science acceleration. #glaciology www.cambridge.org/core/journal...

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Mauri Pelto @mauri-pelto.bsky.social · 26/12/2025

HPS-12 an outlet glacier drains west from the Southern Patagonia Icefield. In a 2017 NASA Earth Observatory project I reported the 13 km retreat 1985-2017 as the fastest in Chile. HPS-12 has now retreated 14.75 km 1985 to 2025, over 50% of its length. #glaciology glacierchange.blog/2025/12/26/h...

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Mauri Pelto @mauri-pelto.bsky.social · 19/12/2025

1/3-The International Year for Glaciers’ Preservation is 2025. Annual mass balance observations of alpine glaciers are reported to the World Glacier Monitoring Service (WGMS) by national reps with a Dec. 1 deadline each year, providing an excellent measure of how they did. Here are four examples.

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Mauri Pelto @mauri-pelto.bsky.social · 08/12/2025

Glaciers are supposed to maintain ~50% snow cover to the end of the summer. Many Rocky Mt. glaciers in Alberta lost all snow cover in 2025 leading to rapid thinning, fragmentation and rock outcrops emerging amidst the glacier. This is not a formula for survival. glacierchange.blog/2025/12/07/s...

glacierchange.blog

Snow Free Rocky Mountain Alberta Glaciers in 2025

Bonnet Glacier in Banff National Park in the 9-5-2025 Sentinel image has lost its snow cover in 2025. This is causing rapid expansion of bedrock amidst the glacier as the glacier thins (yellow arro…

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Mauri Pelto @mauri-pelto.bsky.social · 28/11/2025

Rikeva Glacier, Novaya Zemlya retreat releases new island (A) illustrated in Landsat images from 2000, 2013, 2020 and 2025. The island acted to stabilize glacier front, detachment led to rapid calving retreat from 2020-2025. @nasaearthwatch.bsky.social #glaciology glacierchange.blog/2025/11/28/r...

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Mauri Pelto @mauri-pelto.bsky.social · 28/11/2025

In 2025 Rocky Mt. glaciers in Alberta fared poorly. Here are several examples of glaciers that lost all snow cover. This leads to accelerated melting, thinning and fragmentation. A glaciers "income" is snow and this year was all expenditures (melt) no income. #glaciology #climatescience

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Mauri Pelto @mauri-pelto.bsky.social · 20/11/2025

Macbeth Icefield, British Columbia lost all snow cover in 2025 for first time. The firn has been darkened by nearby forest fires and several adjacent small glaciers have vanished. glacierchange.blog/2025/11/20/m... #climatechange #glaciology

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Mauri Pelto @mauri-pelto.bsky.social · 19/11/2025

On Heard Island, Stephenson Lagoon began forming after 1980 due to Stephenson Glacier retreat, it was largely ice filled until 2010. Yesterday area was 10 sqkm. This opened new king penguin coloniy areas, monitored by the Australian Antarctic Program. glacierchange.blog/2019/02/04/h... #glaciology

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Mauri Pelto @mauri-pelto.bsky.social · 18/11/2025

Silver Star Glacier is the last glacier in the Methow Valley, WA. There were a dozen others when I began working in the watershed in 1984. As summer glacier runoff declines, at lest beavers have returned to buffer late summer low flow glacierchange.blog/2025/11/15/s... #glaciology #climatechagne

glacierchange.blog

Silverstar Glacier, Last Glacier in Methow River Valley, WA

Silver Star Glacier image from August 18, 2025 indicating no retained snow cover. Ilustrates the glacier still has crevasses. The USGS (1971) North Cascade glacier Inventory identified 15 perennial…

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Mauri Pelto @mauri-pelto.bsky.social · 13/11/2025

Tyndall Glacier, Chile is a major outlet of the Southern Patagonia Icefield. Sentinel images illustrate the 2 km retreat from Nov. 2022 to Nov. 2025. The terminus has 1 sqkm of heavily crevassed/rifted area that will calve this summer. #glaciology #climatechange

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Mauri Pelto @mauri-pelto.bsky.social · 10/11/2025

We measured the mass balance annually on three glaciers on Mount Baker, North Cascades of Washington. This year Easton, Rainbow and Sholes Glacier lost more than 2 m w.e. Here is a Sentinel time lapse of snowpack evolution on the the mountain and glaciers. Measured 1.7 m ablation in August.

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Mauri Pelto @mauri-pelto.bsky.social · 29/10/2025

Steffen Glacier, Northern Patagonia Icefield has retreated 3.75 km from Oct. 2023 (black arrow) to Oct. 2025 (yellow arrow). This produced many new icebergs including iceberg X. Laguan de Los Tempanos (T) has also partially drained. More details at: glacierchange.blog/2024/04/21/s...

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Mauri Pelto @mauri-pelto.bsky.social · 28/10/2025

Southern Patagonia Icefield glaciers HPS38 separates into northern and southern arm in 10-26-2025 Sentinel 2 image. This glacier is on west side of the icefield adjacent to Tyndall Glacier to the east that has had a recent rapid calving retreat. glacierchange.blog/2023/04/18/t...

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Mauri Pelto @mauri-pelto.bsky.social · 22/09/2025

Hofsjolkull East, Iceland is a small ice cap east of Vatnajokull that lost all snow cover again in 2025. The lack of accumulation area leads to rapid thinning, bedrock expansion and indicates a glacier that cannot survive. #glaciology glacierchange.blog/2025/09/22/h...

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Mauri Pelto @mauri-pelto.bsky.social · 17/09/2025

Fidtjovbreen and Gonfjordbreen, two adjacent glaciers in Svalbard lost all snow cover in 2024 and 2025. You can walk 15 km from terminus upglacier to the divide and down the other glacier to the terminus without touching any snow, which sustains glaciers. @drheidisevestre.bsky.social #glaciology

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Reposted by Mauri Pelto

University of Southampton @unisouthampton.bsky.social · 09/09/2025

From sun-blocking chemicals to thickening sea ice 🧊🌊 Researchers have found five geoengineering ideas to tackle climate breakdown, but found these are unlikely to work, could harm ecosystems, and may reduce our chances of reaching net zero. Read more 👉 tr.ee/6jto7T @frontiersin.bsky.social

Two people in bright jackets stand on vast, white sea ice scattered with numerous blue melt ponds, creating a striking contrast against the pristine Arctic ice.

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Mauri Pelto @mauri-pelto.bsky.social · 08/09/2025

Worked with Lindsey Doermann at NASA Earth Observatory on article about new island in Alaska created by Alsek Glacier retreat, revealed by a sequence of Landsat images from 1984 to 2025. earthobservatory.nasa.gov/images/15476... #glaciology

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Mauri Pelto @mauri-pelto.bsky.social · 03/09/2025

Stonebreen an ice cap on Edgeoya, Svalbard in recent years has lost nearly all snow/firn cover, retaining no accumulation. This has led to retreat from 2020-2025, indicated on the false color Sentinel images. The bare ice surface is darker and can no longer retain any meltwater. #glaciology

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Reposted by Mauri Pelto

Jeremy Bassis @bassisjeremy.bsky.social · 26/08/2025

Let’s start with the effect of climate on ice sheets. Ice sheets are driven by climate but the Antarctic ice sheet is cold and there is little surface melt. Most of what we see in Antarctica relates to the oceans eroding floating ice shelves from beneath. 2/

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Mauri Pelto @mauri-pelto.bsky.social · 21/08/2025

The retreat of Alsek Glacier, Alaska has in 2025 generated a new island-Prow Knob in Alsek Lake-that has an area of 5 km2. In 1984 the knob was nearly encircled by the glacier. As these Landsat images reveal the loss ofconnection between the glacier and the knob at the end of July/early Aug. 2025.

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