Journal
ENVIRONMENTAL RESEARCH LETTERS
Volume 13, Issue 8, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1748-9326/aad505
Keywords
carbon cycle; regional scale; net ecosystem exchange; atmospheric CO2; attribution; drivers
Funding
- National Aeronautics and Space Administration (NASA) [NNH14AY37I, NNH16AC91I, 80NSSC18K0165, NNX13AC48G]
- NASA ROSES Grant [NNX10AG01A, NNH10AN681]
- NASA Carbon Cycle Science program [NNH10DA001N]
- NOAAs Climate Program Office
- National Science Foundation Biocomplexity in the Environment Program [ATM-0221850]
- DOE Office of Science-Terrestrial Carbon Processes program
- US Department of Energy [DE-AC090-8SR22470]
- California Energy Commission's Public Interest Environmental Research Program [DE-AC02-05CH11231]
- US Department of Energy Office of Science TCP program [DE-FG02-06ER64315]
- US Department of Commerce, NOAA office of Global Programs [NA08OAR4310533]
- NOAA [NA11OAR4310056]
- [DE-AC09-08SR22470]
Ask authors/readers for more resources
Understanding what drives the interannual variability (IAV) of the land carbon sink is crucial for improving future predictions of this important, yet uncertain, component of the climate system. While drivers of global and hemispheric-scale net ecosystem exchange (NEE) IAV have been investigated, our understanding of the drivers of NEE IAV at regional scales (e.g. sub-continental, biome-level) is quite poor. Here we explore the biome-level attribution and drivers of North American NEE using inverse estimates derived from a dense network of atmospheric CO2 observations. We find that deciduous broadleaf and mixed forests are the primary regions responsible for North American NEE IAV, which differs from the ecoregions identified for the globe and Northern Hemisphere. We also find that a suite of terrestrial biosphere models (TBMs) do not agree on the dominant biome contributing to NEE IAV, with TBMs falling along an apparent spectrum ranging between those with IAV dominated primarily by forested ecosystems to those with IAV dominated by non-forested ecosystems. Furthermore, this regional trade-off in TBM NEE IAV is found to be linked to differing regional responses to environmental drivers among TBMs. This work displays the importance of extra-tropical forests in driving continental NEE IAV and also highlights the challenges and limitations of using TBMs to inform regional-scale carbon flux dynamics.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available