@subfossilguy.bsky.social
Assiduous dendroglaciologist, moraine lover, wandering geomorphologist, living in the Holocene, climate (and eco-) anxious, @edytem.bsky.social https://www.researchgate.net/profile/Melaine-Le-Roy-2?ev=hdr_xprf
Close up photo of the growth rings of a subfossil tree showing the last rings produced before its burial by a glacier advance 9600 years ago
Last six years before glacier impact! ๐ง๐ฑ
In the intimacy of this larch tree buried by Tschierva Glacier in 7623 BCE (i.e. ~9650 years ago)! ๐ฒ๐
Note the significant growth reduction five years before the tree death! ๐
Zermatt and a random Alpine peak today at the very dawn! ๐๏ธ๐
From Milano-Paris commercial flight โ๏ธ
You may feel like it's winter, but what we're seeing here is unworthy of December, and flying is to blame!
Via MeteoValledAosta
Have you ever considered growing a glacier? ๐ง
That's what glacier marriages are about! ๐ฑ
To learn more, read the great story written by @glacioverse.bsky.social about this tradition from Baltistan (Pakistan) ๐๏ธ
medium.com/@tirthankarg...
A clear path! ๐คฉ
When the wood is full of resin and sticky, sanding doesn't allow the tree rings to be seen clearly enough ๐ง
It is then necessary to make a path with a razor blade filled with chalk ๐ฌ
Mer de Glace stone pine (300-500 CE) killed during the so-called 'Late Antique Little Ice Age' ๐ง๐ฅถ
Here we are!
What fascism and state lies do to Science and Truth...๐คฎ
Check the US Environmental Protection Agency website about the causes of climate change ๐ง
2024 vs 2025 ๐คฌ
Make the mountains shake! ๐๏ธ๐ฅ
Each new whitish area on today's Sentinel image below is a landslide triggered by the Hubbard Glacier M7 earthquake (Alaska) on Dec. 6th! ๐ฒ
Mostly ice, but also rockslides! ๐ง๐
We have updated the Hubbard Glacier Earthquake that happened at 11:41 am to a magnitude 7. More than 20 aftershocks over magnitude 3 have followed the mainshock so far, with the largest aftershocks ranging from M4 to M5.1.
06.12.2025 22:05 โ ๐ 30 ๐ 20 ๐ฌ 0 ๐ 2
USGS landslide potential maps for the Hubbard Glacier earthquake. It shows an area of significant potential.
This is the current USGS landslide potential maps from the M=7.0 #Hubbard #Glacier #earthquake, which occurred in the last few hours. It shows high landslide potential in the area of Mount Vancouver. The first set of satellite images are going to be interesting.
earthquake.usgs.gov/earthquakes/...
This view pre-dates the 1840 Ahora Gorge catastrophe, which profoundly changed the appearance of the northern slope of the mountain!
Worth read:
my.tretyakov.ru/app/masterpi...
www.tandfonline.com/doi/full/10....
www.sciencedirect.com/science/arti...
www.muchbetteradventures.com/magazine/fro...
'Travelers in the foothills of the Caucasus'
Nikanor Chernetov
1849
Early view of the ice-capped Mount Ararat/Aฤri Daฤi (5137โฏmโฏa.s.l.), contemplated here from the north by Chernetov the very year Friedrich Parrot made the 1st ascent (1829)! ๐๏ธ
But painted in studio only 20 years later... โ๐จ
1/
Vergara Glacier (Cordillera Darwin)
1928 | 2024
This glacier has retreated 3 km over the last century, date on which it still reached the De Agostini fjord ๐ง๐
๐ท
1928: Gunther Plรผschow (from 'Feuerland' vessel)
2024: Cristian Donoso (from kayak)
Human induced freezing height! ๐๐ฅ
Number of days per summer with maximum zero degree limit above 4000 (light red) and 5000 m (dark red), derived from radiosondes in Payerne (CH)
Imagine the consequences for glaciers and permafrost! ๐ง
Source: DWD/MeteoSwiss/GeoSphere Austria
Approx. 10,000 m3 for the Dent de Crolles rockfall๐
www.ledauphine.com/environnemen...
This is a larch tree killed 8,175 yr ago by a glacier advance in the Alps - likely the regional expression of the well-known '8.2 ka event'! โ๏ธ๐งโฑ๏ธ
I could never tire of handling samples like these! ๐ฒ๐
Pure Natural Art from the Holocene! ๐ฅฐ
Marinelli Glacier (Cordillera Darwin)
1913 | 2024
Another mind-boggling comparison! ๐ง๐ฅ
Marinelli Glacier has lost >15 km during this period! ๐ฒ
Monte Shipton (2,568 m) at the background is the highest peak in CD ๐๏ธ
๐ท 1913: pano made of 5 images by Alberto de Agostini
๐ฝ๏ธ 2024: Cristian Donoso
Les rides en question ont l'air perpendiculaires aux paleo-flux glaciaire, venant de l'E et du S pour la zone en question ici
02.12.2025 21:56 โ ๐ 0 ๐ 0 ๐ฌ 0 ๐ 0Par rapport ร d'autres contextes oรน les moraines et formations glaciaires/fluvioglaciaires ont รฉtรฉ รฉrodรฉes par la suite (= dans les vallรฉes), les hรฉritages sont bien prรฉservรฉes pour leur รขge sur le plateau de la Dombes.
Il s'agit lร de l'extension maximale des glaciations alpines (N de la Dombes).
Voir aussi รงa
www.persee.fr/doc/quate_00...
Y'a plusieurs gรฉnรฉrations de moraines frontales dรฉjร ... en haut et au milieu (glaciation ancienne, prรฉ-LGM).
Pour ce qui est des rides rรฉguliรจres (milieu, bas et droite) je dirais des loess recouvrant des dรฉpรดts glaciaires (push moraines?), mais pas spรฉcialiste de cette rรฉgion
Heatwaves are deadly! ๐ฅโ ๏ธ
Here are daily deaths for a region which is (was!) one of the coolest in France in summer, Bretagne!
The red curve shows the mortality linked to 2022 heatwaves (~200 deaths), when regional record was broken: 41.6ยฐC! ๐ฅต
See toll difference with the more typical 2020 year!
Breiรฐamerkurjรถkull (SE Iceland)
1984 | 2025
6 km frontal retreat over 40 years for the 4th largest glacier in Iceland (900 kmยฒ in 2010), an outlet of the Vatnajรถkull ice cap! ๐ง๐ฅ
The LIA max is tangent to coastline ๐
See this paper:
www.researchgate.net/publication/...
GIF Author: Amir Hamedpour
Maladeta Glacier 2025 Mass Blance! ๐ง๐ฅ
8th worst year, out of the 34 measured (since 1992)!
Thickness reduction of 189 cm in average! ๐
Full report (@CH_Ebro, ERHIN programme):
chebro.es/documents/20...
This is the largest known retrogressive thaw slump in the world (Yakutia)! ๐ง๐ฅ
It exposes a remarkable sequence of Ice Age permafrost that record interaction of colluvial/eolian/periglacial processes on a hillslope episodically forested during last 650โka! ๐ฒ
onlinelibrary.wiley.com/doi/full/10....
A giant low angle glacier detachment (40 M m3) occurred on 1st Nov. 2022 in the remote Kunlun range (Tibet, 90.869ยฐ E, 35.969ยฐ N) and was discovered only 2 years later! ๐ฒ๐ง๐
Before collapsing the glacier reached speeds of up to 46 m/day! โก๏ธ
Must read! ๐ฅ
www.researchsquare.com/article/rs-5...
Drone footage of the Blatten deposit shot on 12th November! ๐ฒ
๐ฅ epfl_lhe_lab
The A294 cave contains the worldโs known oldest firn cave deposit, 6100 year old! ๐ง๐ฆ
Ice stratigraphy suggests unprecedented melting conditions since ice began to form! ๐ฅ
'We encourage the scientific community to study these archives before they are lost forever'
tc.copernicus.org/articles/19/...
Dreamy snowscape from the slopes of Mont Buet (3,096 m asl) towards Aiguille Verte, Grandes Jorasses and Mont Blanc today! ๐๏ธ๐คฉ
๐ท @lomdumtblanc.bsky.social ๐
Yes, there are conifers in Greenland! ๐ฒ
500 yr-long Juniperus tree ring-based temperature reconstruction with oldest living shrub 367 yo! ๐ช
Striking here: 1/3 of corpus is from archive (collected end of 19th c)
Highlights importance of reanalysing old samples using modern analytical techniques! ๐
Impressive rock avalanche on the Dent de Crolles (2062 m asl) in the Chartreuse Massif, French Prealps yesterday ๐ฒ
Release area ~1800 m asl
๐ท Sylvain Thiabaud
