%0 Journal Article
%A Anderson, J
%A Heathcote, A
%A Engstrom, D
%A Ryves, D
%A Mills, K
%A Prairie, Y
%A del Giorgio, P
%A Bennion, H
%A Turner, S
%A Rose, N
%A Jones, V
%A Solovieva, N
%A Cook Shinneman, A
%A Umbanhowar, C
%A Fritz, S
%A Verschuren, D
%A Saros, J
%A Russell, J
%A Bindler, R
%A Valero-Garces, B
%A Edlund, M
%A Dietz, R
%A Myrbo, A
%D 2020
%F discovery:10091588
%J Science Advances
%N 16
%T Anthropogenic alteration of nutrient supply increases the global freshwater carbon sink
%U https://discovery.ucl.ac.uk/id/eprint/10091588/
%V 6
%X Lakes have a disproportionate effect on the global carbon (C) cycle relative to their area, mediating C transfer from land to atmosphere, and burying organic-C in their sediments. The magnitude and temporal variability of C burial is, however, poorly constrained, and the degree to which humans have influenced lake C cycling through landscape alteration has not been systematically assessed. Here, we report global and biome specific trajectories of lake C sequestration based on 516 lakes and show that some lake C burial rates (i.e., those in tropical forest and grassland biomes) have quadrupled over the last 100 years. Global lake C-sequestration (~0.12 Pg year−1) has increased by ~72 Tg year−1 since 1900, offsetting 20% of annual CO2 freshwater emissions rising to ~30% if reservoirs are included and contributing to the residual continental C sink. Nutrient availability explains ~70% of the observed increase, while rising temperatures have a minimal effect.
%Z © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).  This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.