A new global ST dataset, the China Merged Surface Temperature (CMST) dataset is developed recently. CMST is created by merging the China-Land Surface Air Temperature (C-LSAT) with the sea surface temperature (SST) data from the Extended Reconstructed Sea Surface Temperature version 5 (ERSSTv5). readme of the data files CMST The CMST（China Merged Surface Temperature） is produced by merging data from the C-LSAT land surface air temperature dataset and the ERSSTv5 sea-surface temperature dataset.-------------------------------------------------------------------------------------------------------------------All values are stored as temperature anomalies in degrees celsius Missing data are set to the value -999.99 Grids are 5x5deg monthly reference_period = [1961 1990] Time：190001-201812（size：1416） Data Array (36x72) Item (1,1) stores the value for the 5-deg-area centred at 0° and 87.5°S Item (36,72) stores the value for the 5-deg-area centred at 360° and 87.5°N

This is the updated version of CMST: https://doi.org/10.1594/PANGAEA.901295. In this version, the dataset has been extended to the period of 1854-2019, and the overall uncertainities has been evaluated by adding up the uncertainties of C-LSAT2.0 and ERSSTv5.