In the summer of 2019, 22 lake water samples were collected in selinco area of Nam Co, Tibet. They were put into plastic bottles. Some samples were titrated on site by alkalinity kit to obtain the concentrations of CO32 - and HCO3 - ions. The rest samples were stored in the refrigerator. After they were brought back to the laboratory, the concentrations of main cations K +, Na +, Ca2 +, Mg2 + were measured by ICP-OES, The concentrations of HNO3 -, SO42 -, F - and Cl - were measured by anion chromatography. The results showed that the highest concentration of Ca2 + in 22 lakes was 34.8ppm in yueqiaco, and the lowest was 1.8ppm in zhangnaicuo, with an average of 11.9ppm. The highest K + ion concentration was 745.6ppm, the lowest was 1.0ppm, the average was 270.9ppm. The highest concentration of Mg2 + was 1632.8ppm in Jiangcuo, and the lowest was 2.5ppm in mudadaryuco, with an average of 180.1ppm. The highest concentration of Na1 + is 5446.0ppm of daze Cuo, and the lowest is 13.8ppm of Mu Cuo, with an average of 1675.3ppm. The highest F-ion concentration was 0.3 mmol / L, the lowest was 0.1 mmol / L, and the average was 0.1 mmol / L. The highest concentration of Cl - was 73.0 mmol / L, the lowest was 0.4 mmol / L, and the average was 19.0 mmol / L. The highest concentration of NO3 - was 0.2 mmol / L, the lowest was 0.1 mmol / L, and the average was 0.2 mmol / L. The highest concentration of S042 - was 219.3 mmol / L, the lowest was 0.1 mmol / L, and the average was 33.3 mmol / L. The highest concentration of CO32 - was 54.0 mmol / L, the lowest was 0.0 mmol / L, and the average was 15.5 mmol / L. The highest concentration of HCO3 - was 50.7 mmol / L, the lowest was 2.0 mmol / L, and the average was 21.1 mmol / L.
In the summer of 2019, the surface sediments of Nam Co, Wuru Co, Gren Co, Qiago Co, Dazz Co, Saibu Co, Gomang Co, Guomang Co, Bamu Co, Nurma Co, Nariping Co, Zhi Co, Jiang Co, Daru Co and Yueqia Co lakes in Nam Co and Siling Co area were collected by grab. The lake sediments were brought back to the laboratory and frozen, and then put into the freeze dryer for freeze drying, The freeze-dried samples were ground to powder by agate mortar, and then the samples were tested by XPert3 Powder X-ray diffraction method. Based on the analysis of Highscore Plus0 software, the content of each major mineral was obtained. The results show that the main minerals in this area are stalagmite, aragonite, calcite and illite.
The wind speed data in the lower boundary layer of Namco, Mt. Qomolangma and sun earth in Tibet Autonomous Region were obtained by using the acoustic radar instrument aq510. Aq510 acoustic radar is based on Doppler effect. There are three loudspeakers in aq510 acoustic radar, which emit sound waves into the air one after another, about once every five seconds. The sound waves emitted into the air will be reflected when encountering small temperature changes in the atmosphere, and the reflected sound waves will be received by the loudspeaker. Due to the Doppler effect, the frequency of reflected sound wave will change during the relative motion of sound wave and wind. The velocity and direction of wind can be calculated simultaneously by using the difference between the frequency of received (reflected) and transmitted sound wave. The data includes wind speed and direction with an interval of 5m between 40-200m, and the time resolution is 10 minutes. It is mainly used for the study of wind resource characteristics.
This data includes the daily average water temperature data at different depths of Nam Co Lake in Tibet which is obtained through field monitoring. The data is continuously recorded by deploying the water quality multi-parameter sonde and temperature thermistors in the water with the resolution of 10 minutes and 2 hours, respectively, and the daily average water temperature is calculated based on the original observed data. The instruments and methods used are very mature and data processing is strictly controlled to ensure the authenticity and reliability of the data; the data has been used in the basic research of physical limnology such as the study of water thermal stratification, the study of lake-air heat balance, etc., and to validate the lake water temperature data derived from remote sensing and different lake models studies. The data can be used in physical limnology, hydrology, lake-air interaction, remote sensing data assimilation verification and lake model research.
This data set includes the daily values of temperature, air pressure, relative humidity, wind speed, precipitation, total radiation, etc. observed at Namuco station from January 1, 2017 to December 31, 2018.