Tianfu's natural calendar 丨 "cold quilts" to glaciers to slow down the mellation (September 2, 2022)

Kawaguan News reporter Wang Daqiang

Recently, in the ancient glaciers of Heishui County, Aba Prefecture, the staff laid the "white film" on the Glacier No. 17 in Dagu. This is a new type of radiation refrigeration material based on Nanjing University's research team based on nano -spinning technology, which is equivalent to covering a "cold quilt" to the glacier to slow down the melting speed of glaciers.

Da Gu Glacier is a rare mountain glacier in my country. It is located in the transition zone of the Qinghai -Tibet Plateau to the Sichuan Basin. It is the northernmost latitude modern mountain glacier in my country. one.

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

In fact, as early as two years ago, some scientists tried to "cool the quilt" to Da Gu Glacier.

In August 2020, a small team of 20 people boarded the ancient glacier and performed a 500 -square -meter "cover quilt" test on the glacier. After more than a year, scientists found that the melting speed of the ice body in the "cover quilt" area was significantly reduced. Compared with ice bodies that were not covered, the thickness of glacier melted was 1.5 meters.

However, the former Dagu 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 research team of Nanjing University has prepared a new type of radiation refrigeration material.

The basic principle of radiation refrigeration technology is to regulate the optical properties of the material to achieve efficient refrigeration of all -weather. Generally, radiation refrigeration materials have two optical characteristics: "high solar light reflectance and high -school infrared band emission".

During the work, high sunlight reflectances can make the material absorb the energy generated by solar light as little as possible and inhibit their temperature rise. At the same time, the higher medium -infrared emission rate can make the material's energy continuously transmitted 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.