Journal of Glaciology, March 2 This new inventory of potential future lakes detected more than 25,000 “overdeepenings” (valleys gouged into the bedrock underneath glaciers due to water erosion) in High Mountain Asia that are over 1,000 m2 large, and nearly 3,000 overdeepenings over 10,000 m2. Water from precipitation and ice melt can accumulate in these deep […]

One Earth, December 18, 2020 In relation to the above work on Antarctic sea-level rise, this late 2020 paper by several past and present IPCC authors may be of interest.  It addresses concerns that many current ice sheet models and data sets may well underestimate projections of sea-level rise from the Greenland and Antarctic ice […]

The Cryosphere, February 26 The contribution of Antarctica to global sea level rise by 2100 varies widely based on the many different models included in the new “ISMIP6” effort. This work is based on the CMIP6 earth systems models developed for the next IPCC Assessment Report, AR6, Part 1 of which will be released in […]

Nature Geoscience, February 25 After a long and relatively stable period, one of Earth’s largest ocean circulation systems — the Atlantic Meridional Overturning Circulation (AMOC) —started weakening during the early 19th century; followed by a second, more rapid, decline in the mid-20th century. Over the past few months, according to this study the AMOC has […]

The Cryosphere, March 3 The response of glaciers in southern European mountain ranges, such as the Pyrenees, to previous warm periods in the Holocene (an epoch covering the previous 12,000 years) has not been well documented. This study concludes that the Monte Perdido Glacier, located in the Central Pyrenees of northeastern Spain, lost significant mass […]

The Cryosphere, February 26 The contribution of Greenland to global sea level rise by 2100 can be as low as 20 mm, and as high as 160 mm (16 cm), depending on whether we follow low or high emissions pathways during the rest of this century; based on modeling from the new “ISMIP6” effort.  This work is based […]

Journal of Glaciology, February 17 In northwestern Greenland, rapid increases in meltwater from Qaanaaq Glacier resulted in two abnormally intense floods during the summers of 2015 and 2016.  The high discharge associated with the 2015 flood, over three times higher than normal from this glacier, came from intense melt caused by warm temperatures and strong […]

Journal of Glaciology, February 17 Although several southern glaciers on Svalbard have retreated significantly in recent decades, the amount of ice overall has remained the same or shown very slight gains through 2018.  However, over the next forty years the average mass of Svalbard glaciers is anticipated to enter a phase of accelerating decline. This pattern […]

Environmental Research Letters, December 22 Emissions from subsea permafrost – existing in near-coastal waters, mostly inundated at the end of the last Ice Age – long have comprised a question mark for global carbon budgets.  This expert assessment, with 32 co-authors estimated the total amount of subsea permafrost as containing 560 Gt carbon in organic […]

Preliminary analysis of satellite images reveals that the massive, catastrophic floods in the Chamoli region of northern India last weekend could be the result of a large landslide. The slab – made of ice and rock – was 500 m across at the top and 150 m thick. The huge mass came crashing down the […]

Nature, February 4 Over the past 140 years, the Cordillera Blanca region of the Peruvian Andes has warmed by 1°C, with 95% of that warming attributed to human emissions. This warming has triggered a dramatic acceleration in the retreat of the Palcaraju Glacier, with its meltwater causing expansion of Lake Palcacocha at the glacier’s base. […]

The Cryosphere, February 11 The massive Denman Glacier in East Antarctica, a 19 km-wide stream of ice that flows over the deepest undersea canyon of the continent, holds 1.5m of sea-level rise and is beginning to show signs of instability; potentially in response to the warming ocean at its base. During the past 50 years, […]

Nature, February 3 During the two most recent ice ages, the Arctic Ocean was almost completely isolated from the rest of the world’s oceans by a thick ice shelf bordering the polar ice sheets covering the Arctic Ocean and parts of North America and northern Europe. This ice shelf cut off connections to the Atlantic […]

Ocean Science, February 2 Ice sheets and oceans take centuries to fully respond to changes in greenhouse gas concentrations and atmospheric temperatures, and the amount of sea level rise that will take place by 2100 is only the beginning of this response, which will take place over many centuries.  New models that correlate average global […]

Nature Reviews Earth & Environment, February 2 Glacier melt and meltwater run-off in the Himalayan region will likely peak in the next few decades (around 2050 under a medium emissions scenario) and then decline as the glaciers shrink. Glaciers in nearly all this region have seen accelerating rates of ice loss for the past several […]