Fig. 2: Riverine CO2 emissions and land carbon uptake between 2000-2020.
From: Recent intensified riverine CO2 emission across the Northern Hemisphere permafrost region
a The distribution of riverine CO2 emissions at a spatial resolution of 1 km between 2000 and 2020. The land boundary of the Tibetan Plateau is derived from ref. 72, while the boundaries for other regions are obtained from Natural Earth (https://www.naturalearthdata.com/). b–g Annual riverine CO2 emissions and land CO2 uptake during May to October in Alaska, East Siberia, Tibetan Plateau, West Siberia, North Europe and Canada, and (h) in the whole Northern Hemisphere permafrost regions. The error bars represent the 95% confidence interval. The percentages represent the average proportions of land CO2 uptake offset by riverine CO2 emissions during 2000-2020. The dashed lines indicate the linear fit for the annual offsetting ratios through the years and the S represents the changing trends. The shadow represents a standard deviation of riverine CO2 emissions offsetting carbon sink. The significances are given as *P < 0.05, **P < 0.01, and ***P < 0.001.
