The 0°C isotherm height is a significant characteristic layer in atmospheric sounding, reflecting the thermal conditions of the middle and lower troposphere. The rise and fall of this layer influence the surface elevation of the 0°C isotherm in mountainous regions, thereby affecting the freeze-thaw processes of water in these areas.By analyzing upper-air data from 39 high-altitude observation stations in western China since 1979 (with some stations having later observation records), including standard-level heights and temperatures, the summer (June-August) 0°C isotherm height was calculated. Using Kriging interpolation and regression analysis, the variation of the summer 0°C isotherm height in the Qaidam Basin from 1985 to 2018 was derived. Additionally, a fishnet tool was employed to statistically assess the 0°C isotherm height change per 100 km grid.
The raw data were obtained from China's upper-air meteorological station observations, comprising upper-air measurements from 89 radiosonde stations across China. These data were acquired by the National Meteorological Information Center (NMIC) through the domestic meteorological telecommunication system and include the following variables at standard pressure levels and significant levels: geopotential height, temperature, dew-point temperature, wind direction, and wind speed.
Using geopotential height and temperature data from standard pressure levels at 39 upper-air stations in western China, we calculated the summer (June-August) 0°C isotherm height. Through Kriging interpolation and regression analysis at 1 km spatial resolution, we derived the variations of summer 0°C isotherm over the Qaidam Basin during 1985-2018. A fishnet grid analysis was employed to quantify altitude changes of the 0°C isotherm per 1 km grid cell.
The data quality is good.
| # | number | name | type |
| 1 | 2018YFC0406600 | National key R & D plan |
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CSTR:11738.11.ncdc.Hydro.db2423.2022
10.12072/ncdc.Hydro.db2423.2022