TY  - Data
T1  - 2018-2024 Annual global land 0.05° daily scale column average dry air methane mole fraction (XCH4) dataset
A1  - jiawei wang
DO  - 10.12072/ncdc.atmosphere.db7690.2026
PY  - 2026
DA  - 2026-07-27
PB  - National Cryosphere Desert Data Center
AB  - This dataset provides the daily scale column average dry air methane mole fraction (XCH4) for the global land area from January 1, 2018 to December 31, 2024, with a spatial resolution of 0.05° and a coverage range of 60°S-90°N. Data were generated using a two-stage model framework: first, Swin-Unet was used to reconstruct the continuous global terrestrial spatial distribution of XCH4 using multi-source satellite observations and environmental auxiliary variables; then, TabM was trained using ground-based Total Carbon Column Observation Network (TCCON) observation data. The residual calibration model was used to correct the system bias of the first-stage results. The dataset contains a total of 2,557 single-band GeoTIFF files, using the WGS84 coordinate system (EPSG:4326), the pixel type is float32, and the XCH4 unit is ppb. The files are named according to "Y-MM-DD.tif", and areas outside the mask of marine and fixed products are set to NoData. Each file contains 6,290,183 valid land pixels. This data set can be used for global and regional methane spatio-temporal patterns, interannual changes, long-term trends, model comparisons and climate environment research.
DB  - NCDC
UR  - http://www.ncdc.ac.cn/portal/metadata/3a73361c-23d7-47c3-8ddb-5ba8e6e12d88
ER  -