Slowing ablation speed The scientific research team is the highest cooling of the new technologies of the "cover quilt" of the ancient glacier "cover quilt", which can reach 10 ° C

Cover Journalist Wang Xianglong Leader Leng Yu's interviewee confessed the picture

On August 17, the weather turned fine. In the Dandu Glacier, Heishui County, Aba Prefecture, Sichuan Province, the scientific research team from Nanjing University, and the staff of the Dagu Glacier Administration, put a piece of "white film" on the glaciers of Da Gu 17. This is a new type of radiation refrigeration material based on Nanjing University's research team based on nano -spinning technology.

In order to slow down the melting speed of glaciers, since 2020, the research team of the Chinese Academy of Sciences began experiments, covering a layer of 500 square meters of "quilts" to Da Gu Glacier. This year, Nanjing University's scientific research team brought a new "cool quilt" to the "cover quilt" of glacier, upgraded to the "2.0" version.

▲ Researchers laid new types of radiation refrigeration technology materials on Da Gu Glacier

Slowing and intensive melting of one year 1.5 meters

Glacier "quilt" ushered in upgrading

With the warming of global climate, in recent years, most glaciers worldwide are melting rapidly. The Dagu Glacier, located on the eastern edge of the Qinghai -Tibet Plateau, is particularly sensitive to climate change. Studies have found that in the past 50 years, the area of ​​Dagu Glacier has been reduced by 70%.

In 2018, the Dagu Glacier Administration cooperated with the National Key Laboratory of the Science Science Science of the Chinese Academy of Sciences to conduct a trial of slowing glacier ablation research. On August 5, 2020, a small team of 20 people boarded the ancient glacier and conducted a 500 -square -meter "cover quilt" test on the glacier.

On October 15, 2021, the research team of the Northwest Ecological and Environmental Resources Research Institute of the Chinese Academy of Sciences went to Dagu 17 glaciers to launch application artificial measures to slow down the scientific research of ancient glacier ablation. This survey found that after a year, the melting speed of the ice body in the "cover of the quilt" area was significantly reduced. Compared with the ice body that was not covered, the thickness of the glacier was 1.5 meters.

On August 13 this year, the "Dagu Glacier Dynamic Change Observation and Copper Academic Symposium" co -sponsored by the Dagu Glacier Administration and Nanjing University and other units was held in Dagu Glacier. In response to the current situation of the accelerated ablation of Dagu Glacier, the new type of radiation refrigeration materials and applications developed by Nanjing University attracted attention. At the meeting, the radiation refrigeration technology has achieved preliminary results in the protection of glaciers. The small area experiments of Nanjing University team in Urumqi Tianshan No. 1 Glacier show that it has a significant relief effect on glaciers.

According to reports, the former glacier "cover quilt" project, due to the selection of materials such as "geomorphin weaving", has not achieved the ideal effect in terms of cooling, waterproofing, and moisturizing. In this context, the team of Nanjing University will optimize the comprehensive performance of the materials based on the new type of radiation refrigeration technology and conduct relevant tests.

▲ Researchers laid new types of radiation refrigeration technology materials on Da Gu Glacier

"Liang Qian" adopts new type of radiation refrigeration technology

The maximum cooling can reach up to 10 ° C or more

Drilling, piles, covering, nails ... On August 17, the staff was working in an orderly manner on the Glacier 17 glacier at an altitude of more than 4,800 meters.

"This work began on August 14th, and 200 square meters of new materials were laid for experiments. The climate on the glacier was great, and the hail was rained for two consecutive days. Zhang Fu, a staff member of the Scientific Research Division of the Dagu Glacier Administration, told the cover reporter that the "white film" covering the glacier is the new type of radiation refrigeration technology material prepared by Nanjing University.

According to reports, radiation refrigeration technology, as a emerging refrigeration technology, is based on the optical properties of regulating materials to achieve high -efficiency refrigeration. Generally, radiation refrigeration materials have two optical characteristics: "high solar light reflectance and high -school infrared band emission".

▲ Researchers laid new types of radiation refrigeration technology materials on the glacier

In the work engineering, the high sunlight reflectance enables the material to absorb the energy generated by the sunlight as little as possible and inhibit its own temperature rise. At the same time, the higher medium -infrared emission rate enables the material to continuously emit the energy through the atmospheric transmission window, and finally achieve its own cooling. Under the common effect of these two mechanisms, radiation refrigeration technology can achieve efficient cooling of objects on objects, and the maximum temperature can reach above 10 ° C.

Zhu Bin, an associate professor and doctoral supervisor at the School of Modern Engineering and Applied Sciences of Nanjing University, said that the new type of radiation refrigeration technology materials has more than 98%of the sunlight reflectance and more than 90%of the medium -infrared emission rate. The characteristics of controllable can meet the needs of different application scenarios.

It is reported that compared with the traditional glacier protection material "geomorician woven", the material has an active refrigeration capacity of all -weather. The daily cooling of the day is above 5 ° C, and the night cooling is above 7 ° C. The surface of the material is highly hydrophobic, it is not vulnerable to pollution, and it will not be adhered to the ice surface. It is easy to recycle. In addition, the form of materials is varied, and it can be customized according to the specific construction requirements on the spot.

"In order to better evaluate the protection of glaciers, the research team of Nanjing University also provides a variety of technical means to monitor the glacier situation in real time, including scanning the thickness of the ice layer, and the surface scanning of the drone laser radar. "Zhang Fu said that the first -hand data obtained by this will help to master the situation of glacier protection in real time, and can adjust the method and methods at any time. On the basis of this, the project will also evaluate the experiment in detail. The influence of refrigeration materials on environment and local biological diversity.

▲ Researchers laid new types of radiation refrigeration technology materials on the glacier

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