The MARIS (Multi-Parameters Arctic Environmental Observations and Information Services) project team conducted a field experiment on lake ice surface in Wuliangsuhai Lake, Urad Front Banner, Bayan Nur, Inner Mongolia on January 16th to 23rd, 2019. The main scientific objectives of this experiment are lake ice physical observation and mechanism of remote sensing research, ground and air data acquisition, and the first verification test of remote sensing in lake ice phenology, thickness and lake ice classification in remote sensing monitoring of rivers, lakes, sea ice.
In order to cope with the ground verification of remote sensing and the decomposition of microwave hybrid pixels, two temperature chains with a distance of 1km are placed in the winter lake ice as the reference point, and an automatic ice weather station was set up to realize the uninterrupted observation during the winter and obtaining environmental information acquisition of different ice types through drones (including observation of lake ice on the edge of the lake). In the arrangement of the remote sensing experimental field, multiple observations were made on the sample position of each 0.5km in the 1×2km range on both sides of the temperature chain (as shown in Figure 1, the test field is involved), and multiple observations of ground air temperature, ice surface temperature, and ice temperature at 3cm, 5cm and 10cm were carried out for thirteen observation points. Focusing on the sensitivity of SAR to ice structure, the data acquisition of ice near surface structure (ice cracks and other structures) was carried out. The drones were used to carry out continuous observations of three voyages at 30m and 100m altitude, and the GPS location of the ice ridges in the lake ice and the detailed distribution of ice cracks were obtained. In the aspect of remote sensing data acquisition, passive microwave radiometer data, Gaofen-1 data, Sentinel data and TerraSAR data were obtained as the basis for further integration of ground and remote sensing.
Through this observation, ground-based verification observations of remote sensing and lake ice physical parameters were carried out for the first time in the field observation of lake ice, which can provide for the development of ice physics and microwave models, and provide passive microwave hybrid pixel decomposition and radar lake ice classification for important support. This test was carried out by the Aerospace Information Research Institute of the Chinese Academy of Sciences (CAS-AIR) and Dalian University of Technology. The team of the CAS-AIR was responsible for the design of the remote sensing verification test site, the collection of data such as drones and distribution points. The targeted acquisition of optical and radar satellite data in China and Europe was coordinated by the Institute of Electronics of the Aerospace Information Research Institute of the Chinese Academy of Sciences, and the ice engineering physics team of Dalian University of Technology set up an ice surface automatic weather station on the ice.
The campaign is funded partly by the partly by Chinese INTAROS counterpart project MARIS and the Strategic Priority Research Program of the Chinese Academy of Sciences (Modelling of the Snow microphysical-radiative interaction and its APPlications).
Date: Wednesday, January 16, 2019 to Wednesday, January 23, 2019
Location: Wuliangsuhai Lake, Inner Mongolia, China
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Text provided by: Yubao Qui, Aerospace Information Research Institute, Chinese Academy of Science (AIR, CAS)
(HiMAC activities : MARIS Project Team, Aerospace Information Research Institute, Chinese Academy of Science, China – AIR-CAS)