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 CO_2,initial
datasets x 2 WTD_initial 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 CH_4,initial datasets, 2 WTD_initial
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 CH₄emissions 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; <0 above 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

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