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You are browsing the archive for Mauri Pelto, Author at AGU Blogosphere.

28 November 2022

North Annapurna Glacier, Nepal Retreat and Lake Development

North Annapurna Glacier in August 2022 Sentinel image. A=North Annapurna Base Camp, I=icefall base,  B= Prominent Knob, C=tributary that has separated by 2022. The green arrow marks the end of the active ice which is now 1.5 km upglacier of the terminus. Note Diki Cho (lake) is relatively free of icebergs that were plentiful in 2018. North Annapurna Glacier drains the northeast side of Annapurna (8091 m). The North Annapurna …

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22 November 2022

Suru Basin, Ladakh India Glaciers Bare of Snowcover in August 2022

Suru Basin glaciers in 1998 and 2022 Landsat images.  Red arrow marks the 1998 terminus location, yellow arrow the 2022 terminus location. S=Shafat Glacier, D=Dilung Glacier. Glacier 1-4 are unnamed glaciers that lost almost all snowcover in 2022. Glaciers of the Suru Basin, draining the Ladakh Range, a drier region of the Himalaya, was significantly by the 2022 pre-monsoon and monsoon season warmth. Here we focus on a group of …

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14 November 2022

Jiangpu and Daoge Glacier Retreat and Lake Expansion, China

Daoge and Jiangpu Glacier retreat and proglacial lake expansion in Landsat images from 1988 and 2022. Yellow arrow is the 2022 terminus location, red arrow the 1988 terminus location and purple dots the snowline. The Jiangpu Glacier and Daoge Glacier are the second and third largest glaciers in the Nyainqentanglha East Range. They flow south in adjacent valleys that feed the Yi’ong Tsangpo, which joins the Parlung Zangbo. Draining north …

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7 November 2022

Bara Shigri Glacier, India Separation of Tributaries

Bara Shigri Glacier in 1993 and 2022 Landsat images indicating the separation of a number of tributaries. Purple dots mark the snowline 1993=5050 m and 2022=5600 m. Bara Shigri Glacier, India is in Chandra Valley of the Western Himalaya. Chand et al (2017) report on the behavior of the glacier from the Little Ice Age to 2014 noting a retreat of 255 m from 1992-2002 and 168 m from 2002-2014. …

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28 October 2022

Suiattle, White River, Whitechuck and Honeycomb Glaciers North Cascade Range Diminishing Rapidly

USGS Map of the four glacier from 1984, with none of the seven lakes existing. In 1988 we mapped four glaciers arrayed around the Kololo Peaks just south of Glacier Peak; Honeycomb and White River feeding into Wenatchee Lake watershed, while Whitechuck and Suiatlle fed into the Suiattle River watershed. They had a combined area of 9.2 km². The glaciers had not developed a series of proglacial terminus lakes at …

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21 October 2022

Icemantle Glacier, British Columbia Declinining Rapidly

Icemantle Glacier in Landsat images from 2000-2022 illustrating the retreat exposing a new lake (Point A)  and separation at Point D. Also the lack of snowcover in 2009, 2015 and 2022 indicative of mass balance loss that drives retreat. Icemantle Glacier is on the north side of Greenmantle Peak just north of Snowcap Lake in the Lilloet River Basin of southwest British Columbia. Here we focus on the retreat and …

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12 October 2022

Brady Glacier Retreat Causes Ice Dammed Spur and Trick Lake Drawdown

Brady Glacier terminus region in September 28, 2022 Sentinel image. Red dots indicate the 2016 margin. Point A marks the new isthmus exposed by falling lake water level. Point B-D are the expanded drainage channels. Brady Glacier is a large Alaskan tidewater glacier in the Glacier Bay region that is beginning phase of substantial retreat that was forecast by Pelto et al (2013). The glacier has seven secondary termini in marginal …

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9 October 2022

Lyman Glacier Lost Half its area from 1979-2022

Map illustrating changes in Lyman Glacier 1890-2017- losing 87% of its area. Lyman Glacier which feeds into Lyman Lake and then Railroad Creek in the Lake Chelan drainage of the North Cascade Range, Washington has retreated a total of 1330 m from the 1890 moraine. In 1929 year the terminus position was mapped by the Washington Water Power Company. The Washington Water Power Company emplaced a benchmark from which to …

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27 September 2022

Tebenkof Glacier, Alaska Snowcover Loss Exposes Century of Annual Layers

Tebenkof Glacier in 2018 ESRI World Image with annual layers numbered. from near the divide to near the terminus. A couple of layers of layers buried near top of glacier by snowcover. This indicates 90-100 annual layers exposed at the surface as they emerge at the surface. Tebenkof Glacier is a land terminating glacier on the Kenai Peninsula just west of Blackstone Bay. WGMS (2021) documented the retreat rate from …

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20 September 2022

Nizkiy Glacier, Novaya Zemlya Embayment Drains via Terminus Breach

Nizkiy Glacier in Sentinel images from July 15 and Sept. 17 2022, before and after the breach of the terminus. Point A-D indicate emerging land due to falling water level as the embayment drains. The former outlet (O) is also noted. Nizkiy  Glacier is on the west coast of the island reaching the Barents Sea Coast.  Carr et al (2014) identified an average retreat rate of 52 meters/year for tidewater …

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14 September 2022

Freemanbreen, Svalbard Retreat Leads to Island Formation

Freemanbreen in 1990 and 2022 Landsat images.  Both are years with limited retained snowcover (S) and some area of retained firn (F). The glacier has retreated from a new island that had formed at Point D. At Point A-C glacier melt and resultant thinning has exposed and expanded bedrock areas. Freemanbreen is the primary southern outlet glacier of the icecap that dominates Barentsøya, Svlabard. Here we examine Landsat imagery from …

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7 September 2022

North Cascade Glacier 2022 Initial Observations-39th Field Season

2022 North Cascade Glacier Climate Project Field Team Science Director: Mauri S. Pelto, [email protected] Art Director: Jill Pelto, [email protected] For the 39th consecutive summer we were in the field to measure and communicate the impact of climate change on North Cascade glaciers. We completed detailed measurements on 10 glaciers, three of which are part of the World Glacier Monitoring Service reference glacier network (42 glaciers globally), which have 30+ consecutive years of …

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31 August 2022

Alpine Glaciers Section-State of the Climate 2021

The 32nd annual State of the Climate report was published today. For the 14th year I have written the Alpine Glacier section chronicling their response for the the hydrological 2020/21 utilizing the World Glacier Monitoring Service (WGMS) data sets. WGMS reference glaciers (30+ years of continuous observation) experienced a mass balance loss of -900 mm w.e., compared to -700 mm w.e. in 2019/20. From 1970-2021 the eight most negative mass …

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29 August 2022

Edgeøya, Svalbard Ice Caps Snow Free in 2022; Fragmentation Ongoing

Langjokulen (La), Kvitisen (Kv), Bergfonna (Be) and Blaisen (Bl) ice caps on Edgeøya in Landsat images from 1990 and 2022. Two years of excepational melt where the ice caps lost all of their snow cover. Here the changes in the ice caps are reviwed at Points A-J. Edgeøya, Svalbard is ~40% ice covered had a number of ice caps some reaching tidewater and others in the interior (Dowdeswell and Bamber …

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26 August 2022

Whitney Glacier, Mount Shasta snow free again in 2022

Whitney Glacier on August 25, 2022 in Sentinel image. Green arrows separation points, yellow arrows remaining snowpack The summer of 2021 proved to be catastrophic for Whitney Glacier on Mount Shasta, California in terms of volume loss, ~15% leading to long term impacts, such as the 50% area reduction and 1000 m retreat since 2005.  The glacier lost 100% of its 2021 snowpack and was in the process of separating …

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21 August 2022

Speel Glacier Retreats out of Alaska

Speel Glacier in 1984 and 2022 Landsat images illustrating lake expansion and detachment of tributaries A-C. Red arrow is 1984 terminus location and yellow arrow is 2022 terminus location. In 1984 I observed Speel Glacier while flying into Juneau, AK to work with the Juneau Icefield Research Program. Speel Glacier is south of the Taku Inlet and the Juneau Icefield draining west from a shared accumulation area with Wright Glacier. …

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29 July 2022

NORTH CASCADE GLACIER CLIMATE PROJECT 2022-39th Annual Field Program

Mount Baker camp for Rainbow and Sholes Glacier (Illustration by Megan Pelto) Science Director: Mauri S. Pelto, [email protected] Art Director: Jill Pelto, [email protected] 2022 Field Season: For the 39th consecutive summer we are heading into the field to measure and communicate the impact of climate change on North Cascade glaciers. We will complete detailed measurements on 10 glaciers, three of which are part of the World Glacier Monitoring Service reference glacier network …

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26 July 2022

Deming Glacier Icefall Deceleration 2017-2022 Driven by Mass Balance Loss

Deming Glacier velocity from NASA MEaSUREs ITS_Live at four locations from below icefall at blue X to above icefall at red X. There is not a significant change in velocity above the icefall (red X), but significant deceleration in the icefall and below the icefall.  The Deming Glacier drains the southwest side of the summit of Mount Baker a stratovolcano in the North Cascades of Washington, with a massive icefall …

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20 July 2022

Glacier Landslides and Collapses Preconditioned by Warming

Lamplugh Glacier, Alaska in 2015 (before) and 2016 (after) landslide in Landsat images. The Landslide covered 17 km2 of the glacier, yellow dots. B=Brady, L=Lamplugh, R=Reid Glacier. Ice whether as permafrost, in a glacier, filling cracks or coating surfaces literally helps stabilize materials on mountain slopes. Climbers who ascend glaciated peaks have long practiced early starts to avoid the heat of the day. The goal to avoid falling, rock, ice …

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19 July 2022

Swiss Alps Exceptionally High Glacier Snowlines Mid-July 2022

Rhone Glacier snowline at end of 2003 melt season, July 9, 2022 and July 17, 2022. Rhone Glacier Sentinel images indicating the snowline position mid July 2021 and 2022 and mid-June 2022. Rhone Glacier Sentinel images indicating the snowline position at the end of the melt season in 2018 and July 18, 2022.  Rhone Glacier is a temperate valley glacier and is the primary headwaters for the Rhone River. Easy …

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