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Gottlieb and Mankin overcame this problem by assessing the relationship between snow mass and the two driving variables - precipitation and temperature - through analysis of an extensive data set of observations in the Northern Hemisphere. The analysis revealed that anthropogenic influence had a decreasing effect on March snow mass between 1981 and 2020 in river-drainage basins south of the latitude 60° N. However, Gottlieb and Mankin also showed that human-induced changes increased snow mass modestly over the same period in several high-latitude cold basins that drain into the Arctic Ocean. Owing to observational uncertainties, it is unclear how well ensemble approaches can represent spatial detailson the scale of basins in the Northern Hemisphere. [...]observational uncertainties limit the accuracy of climate reconstructions and predictions.