Supporting data for Tradeoff of CO2 and CH4 emissions from global peatlands under water-table drawdown

data_revision1.csv collects flux measurements from water table manipulation experiments listed in Reference.doc. site_chara_filled_revision1.csv collects site characteristics, soil, climate, management and topographic information. data_in_shape_permu_revision1.r is the script that combines previous two csv datasets and reorganize it into high-low water table pair for each flux. data_in_shape_permu_revision1.r generate files XXXX_ final_data_revision1.csv that are used in analysing and plotting. pred_nee_future_map_rev2_full.py and pred_ch4_future_map_rev2_long_full.py generate gridded global predictions of future CO2 and CH4 in response to water table drawdown through machine learning models (random forest) trained by the collected water table manipulation experimental datasets. Code in the uncertainty folder combines bootstrap resampling and ensemble predictions to generate 95% confidence intervals. For the response of CO2, the code randomly sampled 80% of observation samples to build one random forest model. This random model was then used to make future predictions with different combinations of predictor datasets. This bootstrap resampling, random forest model building and future prediction was repeated 200 times. In total, the code generated 25200 (200 x 21 CO2,initial datasets x 2 WTDinitial datasets x 3 Climate datasets) ensemble members and estimated the 95% interval as the indicator of prediction uncertainty. For the response of CH4, the code generated 8400 ensemble members through 200 times bootstrap resampling, 7 CH4,initial datasets, 2 WTDinitial datasets and 3 climate datasets. Scripts in the “Figures” folder are used to generate figures in the main text and the supplementary information with, FigureS referring to figures in supplementary information. delta_rcp85_figshare.nc stores means and the 95% confidence intervals of future CO2 and CH4 emissions in response to water table drawdown across the globe under RCP8.5 climate conditions, in unit of mg CO2-eq m-2 h-1. delta_rcp26_figshare.nc stores means and the 95% confidence intervals of the response under RCP2.6 conditions. We assume CH4 has a global warming potential that is 25 times CO2 over a 100-year time horizon. Note for site_chara_filled_revision1.csv WT: >0 below soil surface; Flux: positive sign = release gas to the atmosphere Manipulation length: s: within 1 year; m, 1-10 years; l, >10 years Arctic: North of 66.5N; Boreal, 50-66.5; Temperate, 30-50; tropical, -30 – 30 CH4, unit, µg m-2h-1 CO2, unit, mg m-2h-1