, Ali, Tibet, July 19 (Reporter Sun Zifa) After China's second comprehensive scientific expedition to the Qinghai-Tibet Plateau (second Qinghai-Tibet scientific expedition), the scientific expedition team "History of Human Activities and Its Influence" completed the Langcuo sampling task. After a long journey of more than 700 kilometers on the plateau, on the morning of the 18th, he arrived at Gongzhucuo, which is more than 4,700 meters above sea level, in Burang County, Ngari Prefecture, Tibet to conduct scientific research.

Gongzhu is wrong.

Photo by China News Agency reporter Sun Zifa

Snow can be seen in the mountains on the shore of Gongzhucuo.

Photo by China News Agency reporter Sun Zifa

  Scientific expedition team member and doctoral student of the Institute of Tibetan Plateau Research of the Chinese Academy of Sciences (Tibetan Plateau Institute of the Chinese Academy of Sciences) led a team member to take an inflatable speedboat at the center of Gongzhucuo Lake at a depth of 24.5 meters, using a gravity drill sampler to obtain two lake sediment cores , And collect surface sediments from several lakes at the same time.

The scientific expedition team rushed to Shiquanhe Town, Ali.

Photo by China News Agency reporter Sun Zifa

  Another task of Gongzhu’s wrong scientific expedition was to find the lake water temperature monitoring device that was placed a few years ago. Affected by various factors such as the wrong water level of Gongzhu, changes in water flow and other factors, the scientific expedition team conducted a long search on the lake that day, but did not A temperature monitoring device can be found.

Gongzhucuo under the blue sky and white clouds.

Photo by China News Agency reporter Sun Zifa

  Ji Kejia introduced that placing thermometers in the lake from the water surface to the bottom of the lake can obtain the stratification type of plateau lakes, which helps scientists use various indicators in the lake to more accurately reconstruct past climate changes.

Since 2012, the Qinghai-Tibet Plateau Institute of the Chinese Academy of Sciences team has carried out temperature monitoring in more than ten plateau lakes.

The temperature monitoring of Gongzhucuo began in July 2015. Ten thermometers were placed in the center of the lake from the surface of the lake to the bottom of the lake to monitor the temperature profile changes. It was found that Gongzhucuo mixed under the lake from April to October and September to October. Floor.

The scientific expedition team prepares for expedition on the wrong bank of Gongzhu.

Photo by China News Agency reporter Sun Zifa

  However, finding thermometers in Gongzhu wrong in recent years has not gone smoothly. “We guessed that it might be the lake water level changes that made the thermometers undetectable”.

The latest research found that in recent years, the water level of lakes in the southern part of the plateau has generally declined, while the water level of lakes in the north has risen; the drop in lake water level may cause the lake to freeze in winter and move the thermometer position, and the rise in the water level will make the thermometer position too deep to be found.

The vehicles of the scientific expedition unit parked on the shore of the lake in Gongzhucuo.

Photo by China News Agency reporter Sun Zifa

  The scientific expedition team members said that scientific research work has never been smooth sailing, especially the high-altitude scientific expedition, which requires both physical and mental effort, and is full of greater risks and uncertainties. Therefore, the wrong thermometer was not found this time. The results are normal, and the researchers are reminded to continuously improve and perfect the scientific examination equipment and methods in the follow-up.

  In addition to the fact that the thermometer was not found, there were two episodes in Gongzhu’s wrong scientific examination that reflected the hard work of field surgical examinations: one of the two inflatable speedboats was running on the lake shortly after the engine malfunctioned. The team paddles and landed; second, the rear wheel of the truck loaded with scientific research equipment and work and living materials once fell into the bunker on the lake shore, and finally the surprise was solved.

  After completing the wrong scientific expedition in Gongzhu, the expedition team continued to the west without stopping and arrived at Shiquanhe Town, where the Ngari District Administrative Office is located, on the evening of the 18th.

From Lhasa to this point, the scientific expedition team has traveled more than 1,500 kilometers on the Qinghai-Tibet Plateau with an average altitude of more than 4,000 meters. The expedition team members will carry out field work, replenish daily necessities and take a rest here, which is special for the follow-up scientific expedition. It is necessary to prepare for camping work on the shores of plateau lakes.

After the scientific expedition team completed the wrong job on Gongzhu, they lifted the inflatable speedboat ashore.

Photo by China News Agency reporter Sun Zifa

The scientific expedition team rides on an inflatable speedboat on the surface of Gongzhucuo Lake.

Photo by China News Agency reporter Sun Zifa

  It is understood that Gongzhu Co is located in the fault basin between the Himalayas and Gangdis Mountains. It is the first plateau lake in Tibet entering the Ngari region via the southern line of Ngari. The 219 National Highway passes through its northern bank.

The area of ​​Gongzhucuo is 66.2 square kilometers, the lake is 4786 meters above sea level, the average annual temperature of the lake area is 0-2 ℃, and the average annual precipitation is 200-300 mm. The lake water is mainly supplied by surface runoff.