Melaine Le Roy
@subfossilguy
Assiduous dendroglaciologist, moraine lover, wandering geomorphologist, living in the Holocene, climate (and eco-) anxious, @edytem_fr
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Still at #merdeglace for Day 6 of #7daysoffieldwork to celebrate 10 years of sampling and ~400 subfossil wood samples retrieved from this single moraine ! 🌲💍 #treerings #fieldwork #chamonix
Subfossil spruce Bossons Glacier 80-253 CE Tree buried during an early glacier advance post Roman Warm Period 🧊🌲💍 Repeated phases with compression wood show this tree lived in a dynamic environment (avalanche, landslides?) ❄️💧 #ILoveTreeRings
The Sierra Nevada’s glaciers—now projected to disappear by 2100 CE—have never before vanished throughout human history in the Americas. Learn more in @ScienceAdvances: scim.ag/4nvULqr
Cold War insanity! 😱 In 1965, a plutonium-packed generator was lost on one of world’s highest mtns - Nanda Devi (7,816 m) - in a US covert mission to spy on China! It’s likely still buried in a glacier feeding the Ganges - a river supporting ~600 M! 😲 nytimes.com/interactive/20…
A typical Stone Pine (Pinus cembra L.) 'ringscape' 🥰🌲💍 - Narrow latewood - large resin canals (creating those 'bumps!) - More complacent growth than larch We are here ~8,300 years ago above 2,000 m asl in the Alps 🏔️🧊 Average ring width ~0.3 mm 🔬
New study found the largest lahar of the last millennium occurred at Mt Rainier (4.392 m, WA) at the end of the year 1507! 🌊⌚ Wonderful tree rings... 🥰🌲💍 Below are sampling pics of excavated trees with Mt Rainier in the background 🏔️ pubs.geoscienceworld.org/gsa/geology/ar…
Aiguille du Midi (3842 m) 1957 | 2025 Upper 'Mallory Glacier' (N aspect) and Aig. du Midi from the east! Remember that we are here “on top” of Alpine glaciers! Only 5 to 17 m of ice left here. In some places, up to 18 m have melted since 2003 only! 🔥 Source: Xavier Cailhol 🙏
Last six years before glacier impact! 🧊😱 In the intimacy of this larch tree buried by Tschierva Glacier in 7623 BCE (i.e. ~9650 years ago)! 🌲💍 Note the significant growth reduction five years before the tree death! 🌊
Zermatt and a random Alpine peak today at the very dawn! 🏔️🌄 From Milano-Paris commercial flight ✈️ You may feel like it's winter, but what we're seeing here is unworthy of December, and flying is to blame! Via MeteoValledAosta
A clear path! 🤩 When the wood is sticky, sanding doesn't allow the tree rings to be seen clearly enough 🧐 It is then necessary to make a path with a razor blade filled with chalk 🔬 Mer de Glace stone pine (300-500 CE) killed during the 'Late Antique Little Ice Age' 🧊🥶
Here we are! What fascism and state lies do to Science and Truth...🤮 Check the US Environmental Protection Agency website about the causes of climate change 🧐 2024 vs 2025 🤬
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.
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 🧊🌊 📷 1928: Gunther Plüschow (from 'Feuerland' vessel) 2024: Cristian Donoso (from kayak)
But let's assume classifying weather stations by their surrounding population density is at least somewhat useful for eliminating biases. How does the global land average from the 19% of very rural stations compare to the average of all stations? They are extremely similar. 5/
Human-induced freezing height! 📈🔥 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! 💧 Source: DWD/MeteoSwiss/GeoSphere Austria
A historic December warm spell is about sweeping Europe. Exceptional mild air will cross all Europe from SW to NE with Minimums locally >15C and >10C even in some Scandinavia spots ! Expect Hundreds if not thousands of records allover. Only Italy won't see any exceptional warmth
Approx. 10,000 m3 for the Dent de Crolles rockfall👇 ledauphine.com/environnement/…
Impressive rock avalanche on the Dent de Crolles (2062 m asl) in the Chartreuse Massif, French Prealps yesterday 😲 Release area ~1800 m asl 📷 Sylvain Thiabaud
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'! ❄️🧊⏱️ I could never tire of handling samples like these! 🌲💍 Pure Natural Art from the Holocene! 🥰
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