On March 21, 2008, Yun-12 aircraft carried L & amp; The K-band microwave radiometer has carried out aviation flight test, and the flight time is 8:25 to 11:15bjt. The main parameters of ground synchronous observation include surface radiation temperature, surface physical temperature, weight and water content of soil profile 0-1cm, 1-3cm and 3-5cm (drying and weighing method), surface soil freezing and thawing status (expressed in freezing depth) and snow depth.
Due to the snowfall in biandukou area at night, the surface is covered with about 10cm of new snow. As the time approaches noon, the surface snow shows signs of melting. Due to different altitudes in the flight area, the time of snow melting is also different. However, since the snow analyzer was not prepared in advance, there was no measurement of snow related parameters.
1) The observation angle of microwave radiometer is vertical to the surface, so there is no polarization of radiometer data.
2) The surface radiation temperature and physical temperature are measured by hand-held infrared thermometer, and the short-range measurement mode is adopted. The surface physical temperature adopts the thermocouple thermometer attached to the hand-held infrared thermometer (needle thermistor thermometer is also used at some sample points).
3) The measurement method of freezing and thawing depth is to judge the freezing and thawing depth by inserting chopsticks into the soil to feel its hardness or directly digging out the frozen layer on the surface of the soil to measure the thickness of the frozen layer. Measured directly with a ruler, when the soil hardness is large and there are ice crystals, it is considered that the soil is frozen; On the contrary, it is considered that the soil is not frozen.
4) The depth of snow is measured directly with a ruler.
5) Soil moisture: take 0-1cm, 1-3cm and 3-5cm soil samples, put them into self sealing bags, and then dry them in microwave oven to calculate the soil weight and water content. The volumetric water content of the soil can be calculated from the bulk density data. Data can be opened with Microsoft office software.
This data set includes the ground observation data and sample point coordinate data of each ground synchronous sampling point.
On March 21, 2008, Yun-12 aircraft carried out aviation flight test with LK band microwave radiometer, and the flight time was 8:25 to 11:15bjt. The main parameters of ground synchronous observation include surface radiation temperature, surface physical temperature, weight and water content of soil profile 0-1cm, 1-3cm and 3-5cm (drying and weighing method), surface soil freezing and thawing status (expressed in freezing depth) and snow depth.
Due to the snowfall in biandukou area at night, the surface is covered with about 10cm of new snow. As the time approaches noon, the surface snow shows signs of melting. Due to different altitudes in the flight area, the time of snow melting is also different. However, since the snow analyzer was not prepared in advance, there was no measurement of snow related parameters.
The observation angle of microwave radiometer is vertical to the surface, so there is no polarization of radiometer data.
2) The surface radiation temperature and physical temperature are measured by hand-held infrared thermometer, and the short-range measurement mode is adopted. The surface physical temperature adopts the thermocouple thermometer attached to the hand-held infrared thermometer (needle thermistor thermometer is also used at some sample points).
3) The measurement method of freezing and thawing depth is to judge the freezing and thawing depth by inserting chopsticks into the soil to feel its hardness or directly digging out the frozen layer on the surface of the soil to measure the thickness of the frozen layer. Measured directly with a ruler, when the soil hardness is large and there are ice crystals, it is considered that the soil is frozen; On the contrary, it is considered that the soil is not frozen.
4) The depth of snow is measured directly with a ruler.
5) Soil moisture: take 0-1cm, 1-3cm and 3-5cm soil samples, put them into self sealing bags, and then dry them in microwave oven to calculate the soil weight and water content. The volumetric water content of the soil can be calculated from the bulk density data. Data can be opened with Microsoft office software.
Good data quality
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CSTR:11738.11.ncdc.NIEER.2021.1833
10.12072/ncdc.NIEER.db1884.2022