Learning About Glaciers: Scientists Extract Ice Cores in Tajikistan
A group of international scientists is on a complex, arduous expedition to learn more about the glaciers of the Pamir Mountains in Tajikistan, drilling and extracting two deep ice cores in what the team descibes as a race against the impact of global warming.
Scientists from the Swiss-funded PAMIR Project and their Tajik partners are working at an altitude of 5,800 meters on the Kon Chukurbashi ice cap, taking ice samples down to the bedrock at an estimated depth of just over 100 meters.
“The Pamirs remain to date one of the last major high-altitude regions where no deep ice core has ever been retrieved,” the PAMIR Project said in a statement. “If many glaciers in the Pamir Mountains of Tajikistan still seem resilient in the face of global warming, scientists do not know how long this will last.”
The two-week expedition began on September 24. If successful, it will secure environmental information from air bubbles and chemical trace concentrations and isotopes, and possibly organisms trapped in the ice, and help future generations anticipate and adapt to changes in Earth’s climate and ecosystems, the project said. The expedition is being coordinated by the University of Fribourg in Switzerland and conducted by the National Academy of Sciences of Tajikistan along with Swiss, Japanese, and American universities.
Because of the extreme altitude, team members had prepared for gradual acclimatization with a plan for a base camp and a camp at higher altitude. Logistical difficulties and the challenges of site access have prevented such an expedition in the past.
The Pamir glaciers are a riddle to scientists who have observed both health and decay in the reaction of the high-altitude ecosystems to climate change. Various theories, including more wind-induced precipitation at high elevations and summertime cooling, have been put forward. But field measurements are lacking and the theories have not been tested against scientific data.
At an international conference on glacier preservation in Dushanbe this year, President Emomali Rahmon of Tajikistan called for the establishment of a regional lab to study the topic. Most of Central Asia’s glaciers are in Tajikistan.
The United Nations said last month that some 1,000 glaciers out of the total number of 14,000 that have existed in Tajikistan in recent decades have disappeared and many small ones are expected to vanish in the next 30-40 years.
A recent study published in the Communications Earth & Environment journal noted the relative stability of some glaciers in Central Asia, but said there had been a recent drop in glacier health in the Northwestern Pamirs following significantly lower snowfall and snow depth since 2018.
One of the authors of that study is Evan Miles, a Switzerland-based glaciologist who is leading the current PAMIR Project expedition.
“This ice holds hundreds and possibly even thousands of years of physical records of snowfall, temperature, dust, and atmospheric chemistry,” Miles said, according to the project statement. “We are racing against time to retrieve it before climate-change induced melt damages these natural archives forever.”
Of the two ice cores marked for extraction, one will be used for research and the other will go to a storage site to be built at the French-Italian Concordia station in Antarctica.
The goal of the site is to “collect, save and manage ice cores from selected glaciers currently in danger of degradation or disappearance, with their yielded information for decades and centuries to come,” said the Ice Memory Foundation, a France-based group that was created by scientific institutions.
