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

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 🏔️ https://t.co/YY6aIyJ65k

Why guess when you can know?

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

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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 🤬

This view pre-dates the 1840 Ahora Gorge catastrophe, which profoundly changed the appearance of the northern slope of the mountain! Worth read: https://t.co/qvaZ9xjWPs https://t.co/ePXYpjEl64 https://t.co/q2s192lDF2 https://t.co/lfQSLlyDqj 2/

'Travelers in the foothills of the Caucasus' Nikanor Chernetov 1849 Early view of the ice-capped Mount Ararat/Ağri Daği (5137 m asl), seen here from the N by Chernetov the very year Friedrich Parrot made the 1st ascent (1829)! 🏔️ But painted in studio 20 years later! ⌛🎨 1/

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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

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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👇 https://t.co/oykbShQFBj

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! 🥰

Marinelli Glacier (Cordillera Darwin) 1913 | 2024 Another mind-boggling comparison! 🧊🔥 Marinelli Gl. has lost >15 km during this period! 😲 Mte Shipton (2568 m) at the background is highest peak in CD 🏔️ 📷 1913: pano made of 5 pics by Alberto de Agostini 📽️ 2024: C. Donoso

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Heatwaves are deadly! 🔥☠️ This graph shows daily deaths for a region which is (was!) arguably one of the coolest in France in summer, Bretagne! The red curve shows the mortality linked to the 2022 heatwaves (totalling ~200 deaths), when regional record was broken (41.6°C!) 🥵

Breiðamerkurjökull (SE Iceland) 1984 | 2025 6 km frontal retreat over 40 years for the 4th largest glacier in Iceland (900 km² in 2010), an outlet of the Vatnajökull ice cap! 🧊🔥 LIA max is tangent to coastline 🌊 See this paper: https://t.co/c2IgtFwt0j GIF: Amir Hamedpour

Maladeta Glacier 2025 Mass Blance! 🧊🔥 8th worst year, out of the 34 measured (since 1992)! Thickness reduction of 189 cm in average! 📈 Full report (@CH_Ebro, ERHIN programme): https://t.co/cLES8gSMma

Recently, @BerkeleyEarth expanded our temperature database by integrating the HCLIM data set. https://t.co/ee9zg9dgFW The additional data rescued by HCLIM helps improve early reconstructions, but doesn't fundamentally change the large uncertainties due to sparse sampling. 1/

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