Researchers, including scientists from the Austrian Academy of Sciences, have extracted and analysed an ice core from the Wei\u00dfseespitze summit in Tyrol, providing a continuous record of climate and environmental conditions spanning several millennia. The results also underscore the accelerated rate of glacier loss in the Eastern Alps: since 2019, the ice mass at the summit has been reduced by almost half.<\/p>\n
Situated at an elevation of 3,499 metres, the glacier on the Wei\u00dfseespitze in the \u00d6tztal Alps has preserved stratified atmospheric records, capturing signals of climate variability, weather dynamics, foehn activity, forest fire events, and early anthropogenic pollution. At this high-altitude site, researchers from the University of Venice, working in collaboration with the Austrian Academy of Sciences (\u00d6AW), Geosphere Austria, and the University of Innsbruck, identified a climate archive dating back approximately 6,000 years within a summit ice cap only around ten metres thick.<\/p>\n
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This archive was chemically analysed, providing data spanning from Roman times to the early modern period. However, the archive is now undergoing rapid ablation: at the drilling site, only about 5.5 metres of ice remain. Within a few years, it may be entirely lost.<\/p>\n
\u201cWe are scrambling to preserve these archives before the stored information is irretrievably lost,\u201d says Andrea Fischer, glaciologist at the Institute for Interdisciplinary Mountain Research of the Austrian Academy of Sciences and co-author of the study.<\/p>\n
A melting archive<\/p>\n
Ice cores function as high-resolution archives of past atmospheric composition. \u201cAll substances transported through the atmosphere are deposited and preserved in the ice, along with precipitation and snow,\u201d explains Fischer. \u201cThis enables us to reconstruct a wide range of environmental parameters, including the origin of precipitation, moisture source regions, and precipitation intensity. We can also identify particulate inputs such as mineral dust, Saharan aerosols, and charcoal, as well as infer broader atmospheric circulation patterns and climate variability.\u201d<\/p>\n
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Such long-term datasets are essential for contextualising current climate change. \u201cExtended time series are necessary to understand the full range of climatic mechanisms,\u201d Fischer adds. \u201cThe ice archive allows us to quantify the frequency and duration of droughts and wet phases, providing a baseline for evaluating future climate scenarios.\u201d<\/p>\n
A unique location<\/p>\n
Lower-elevation glaciers in the Eastern Alps have historically been considered less suitable for preserving undisturbed palaeoclimate records than those in the Western Alps, largely due to uncertainties regarding melt-induced disturbance. However, the present study demonstrates that, under favourable geomorphological conditions, well-preserved ice can persist for millennia. The Wei\u00dfseespitze represents such a site. \u201cIts flattened summit geometry and symmetrical ice distribution allow for robust modelling of ice dynamics and accumulation processes,\u201d says Fischer.<\/p>\n
Close to human activity<\/p>\n
In 2019, an ice core was extracted to a depth of nearly ten metres. Using advanced dating techniques\u2014including the argon-39 (\u00b3\u2079Ar) method developed in collaboration with the University of Heidelberg\u2014researchers determined that the uppermost sampled layer was already approximately 371 years old. This indicates that the most recent stratigraphic layers had already been lost due to surface melting.<\/p>\n
Geochemical analyses identified 18 trace elements, organic acids, and additional chemical proxies. The ice record captures both natural inputs, such as marine aerosols and mineral dust, and anthropogenic signals linked to mining, metallurgy, and land-use change. \u201cThe Wei\u00dfseespitze archive is particularly significant because it reflects environmental conditions in close proximity to human activity, including deforestation and mining,\u201d Fischer notes.<\/p>\n
Geochemical evidence indicates that between approximately AD 700 and 1200, concentrations of lead and other heavy metals remained low, consistent with a predominantly unpolluted pre-industrial background. \u201cFrom around AD 950 onwards, elevated concentrations of arsenic, lead, copper, and silver are observed, corresponding to periods of intensified medieval mining and smelting activity across the Alps and wider Europe,\u201d says Azzura Spagnesi, lead author of the study from Ca\u2019 Foscari University of Venice. These results corroborate and complement palaeoenvironmental data derived from pollen records in peat bogs within the Geosphere Austria network.<\/p>\n
For researchers, such ice archives represent a substantial advancement in palaeoclimate reconstruction. \u201cAn archive like this constitutes a quantum leap in terms of research potential and insight.\u201d However, the temporal window for investigation is rapidly narrowing. Since 2019, several additional metres of ice have been lost. Material accumulated over 6,000 years may disappear within only a few decades\u2014or even a few summers.<\/p>\n
Header Image Credit : Andrea Fischer<\/p>\n