Icebergs are dangerous to sea navigation, and icebergs are also a kind of freshwater resource.

According to Liu Jianqiang, deputy director of the National Satellite Ocean Application Center of the Ministry of Natural Resources, since the launch of the Ocean-1 C/D satellite, a large amount of iceberg data has been accumulated, which provides a data basis for the study of iceberg generation and disappearance and drift. The direction and speed of ocean currents, analyze the changing laws of material migration, and guide the choice of ship routes.

　　△At 4:25 UTC on September 25, 2019, the ocean water color water temperature scanner captured that the ice shelf had collapsed and the iceberg drifted off the ice shelf and moved to the ocean.

　　On September 25, 2019, the image obtained by the Ocean One C satellite ocean water color and water temperature scanner showed that an iceberg had fallen off the Amery ice shelf. The iceberg was numbered D28, October 8, 2019 The image of the coastal zone imager of the Ocean-1C satellite is more clear. After measuring, the length of the iceberg is about 62 kilometers, the width is about 38 kilometers, and the area reaches 1,730 square kilometers, which is larger than the area of ​​Shanghai Chongming Island and equivalent to the area of ​​Zhuhai. The D28 iceberg first drifted with the waves in Prydz Bay, and began to drift away from Prydz Bay in April 2020, heading westward, flowing almost parallel to the coast.

△Comparison of images between November 16, 2020 and January 15, 2021 reveals that the D28 iceberg has turned 180 degrees

　　In November 2020, the D28 iceberg reached the shore of enderby land. During the two months from November 16, 2020 to January 18, 2021, the D28 iceberg made a 180 After turning around, the iceberg continued to flow westward.

D28 began to turn in December 2020, and the iceberg was perpendicular to the coast on December 30, and then began to turn.

Until January 15, 2021, the iceberg was flowing parallel to the coast again. For two months, one end of the iceberg moved about 150 kilometers and the direction turned 180 degrees.

　　The D28 iceberg has traveled nearly 1,500 kilometers and spanned 20 longitudes in less than 500 days since the collapse of the Emory ice shelf.

It was verified from the flow direction that the Antarctic drifted westward, and at the same time, it was calculated that the average moving distance per day is 3 kilometers, that is, the average flow velocity is 0.035 m/s. The flow velocity is different in the area, sea surface wind field, and seabed topography each day.

　　(CCTV reporter Li Jie Zheng Tianhao)