50 years’ melting of Dagu glacier 70% of scientists tested “quilt” mitigation

, ,

,

,

,

the experimental site

,

on August 5, 2020, a small team of 20 people boarded the Dagu glacier in Aba, Sichuan Province, not for tourism, but to cover the Dagu glacier. Wang Feiteng, deputy director of the State Key Laboratory of Cryosphere science of the Chinese Academy of Sciences, told reporters that this is the first experiment in China to apply “geoengineering” measures to slow down glacier melting. In the past half century, the Dagu glacier has been melting rapidly, and the whole glacier area has been melting by 70%. In order to slow down its melting rate, Dagu glacier Scenic Area Administration has cooperated with the State Key Laboratory of Cryosphere science of Chinese Academy of Sciences in 2018. This time, the method of covering the surface of the glacier with heat-insulating and reflective materials was selected to carry out a pilot project on a 500 square meter glacier. If the effect is good, this measure will be optimized and popularized.

According to the introduction of the

summary report of the trump glacier tourism research project issued by the National Key Laboratory of the frozen circle science of the Chinese Academy of Sciences in April 2018, the total glacier area of the ancient glaciers in the ancient city was 1.70 square kilometers, which was 25% lower than that in the second glacial census in 2007, which was 69.64% lower than that in the first glacial census from 1962 to 1971, and 4 of the glaciers disappeared. The “glacier” in 2016, the glacier research project of the ancient glacier, concluded that the total area of glacier was 25% trump. Wang Feiteng of

and

said that the reason why he chose to carry out the glacier melting experiment in Dagu glacier this time is mainly because Dagu glacier is a marine mountain glacier, which is the northernmost and easternmost glacier distribution area of China’s marine glaciers, which is known as the “hundred gardens of glacier relics”.

and

experimental schemes

and

are covered with geotextile to keep out sunlight and keep warm inside. At present, there are few researches on engineering measures to deal with glacier melting. Previously, the state started to protect glaciers in terms of energy conservation and emission reduction and preventing climate warming. We combined these two issues into one action plan to directly protect glaciers from specific aspects. ” Wang Feiteng, deputy director of the State Key Laboratory of Cryosphere science, Chinese Academy of Sciences, said the experiment was the first scientific experiment conducted by Chinese scientists using “geoengineering” measures in the face of glacier melting. “Geoengineering” refers to the large-scale transformation of the surface environment to cope with the impact of climate change.

,

, ,

,

it is reported that in 2018, Dagu glacier Scenic Area Administration and the State Key Laboratory of Cryosphere science decided to carry out glacier ablation experiments.

and

according to Wang Feiteng, similar experiments have been conducted in Austria and Switzerland to alleviate snow fields and glacier melting. Scientists covered the glacier with a white wool blanket to block and reflect solar radiation to alleviate glacier melting. “The effect is still in qualitative description, and there is no quantitative analysis.” So the lab decided to do an experiment to verify how much mitigation the paving material can have on glacier melting. After a series of indoor experiments of

and

, researchers chose geotextile as covering material and decided to conduct field experiments.

,

geotextile has high reflectivity, which can enhance the reflection of solar radiation, thus limiting the net radiation of glacier. At the same time, the geotextile reduces the sensible heat flux and latent heat flux between the glacier and the outside world, which can keep the glacier warm Wang Feiteng told reporters, “this experiment we use 5 to 8 mm geotextile, considering the cost problem, if successful, large-scale promotion can control the cost.” How can

and

cover the

and

cable cars to transport materials to high altitudes.

and

roll down the

and

by using the gravity of the material itself. August is the most severe time for the melting of Dagu glacier. Four experts from the laboratory and more than ten staff members of the scenic area decided to start laying materials on August 5. The researchers selected Glacier No. 17 in the middle and lower part of the glacier and set up a 500 square meter test site here. The insulation materials laid by

and

are 2m wide and 50m long. During construction, the materials are transported to 4860 meters above sea level by Dagu glacier cable car, and then laid to the construction area. During the construction, the researchers lay from the high place to the low place, and use the gravity of the material itself to roll down. After the whole material is laid, the adjacent materials are lapped together and pressed with sandbags. When laying, the sandbags shall be fixed with ropes tied to sandbags every 3 meters. Wang Feiteng of

and

said that it is also the first time in China to quantitatively measure the effect of heat insulation and anti glacier ablation. They will measure and judge the height and volume of glacier melting based on the flower rod network array laid near the glacier and three-dimensional laser scanner. “We put some poles on the glacier and judge the height and distance of glacier melting according to the number of poles exposed in two months. The volume of ablation was measured according to the height and the surface of the glacier. Comparing these areas with uncovered areas, the effect of laying thermal insulation materials can be obtained. ”

Chengdu Business Daily – Red Star journalist Shao Zhoubo intern reporter Guo Yimeng

original title: the Dagu glacier has been melting 70% in 50 years, scientists have been experimenting with “quilt” mitigation, and experts from Chinese Academy of Sciences: This is the first

in China