@article{886f52d2cd924c17bac15338ae3fbec1,
title = "Constraining estimates of terrestrial carbon uptake: new opportunities using long-term satellite observations and data assimilation",
abstract = "Summary: The response of terrestrial carbon uptake to increasing atmospheric [CO2], that is the CO2 fertilization effect (CFE), remains a key area of uncertainty in carbon cycle science. Here we provide a perspective on how satellite observations could be better used to understand and constrain CFE. We then highlight data assimilation (DA) as an effective way to reconcile different satellite datasets and systematically constrain carbon uptake trends in Earth System Models. As a proof-of-concept, we show that joint DA of multiple independent satellite datasets reduced model ensemble error by better constraining unobservable processes and variables, including those directly impacted by CFE. DA of multiple satellite datasets offers a powerful technique that could improve understanding of CFE and enable more accurate forecasts of terrestrial carbon uptake.",
keywords = "CO fertilization, Earth System Model, data assimilation, gross primary productivity, light use efficiency, satellite remote sensing, water use efficiency",
author = "Smith, {William K.} and Fox, {Andrew M.} and Natasha MacBean and Moore, {David J.P.} and Parazoo, {Nicholas C.}",
note = "Funding Information: We thank Dr Rich Norby for encouraging us to write this paper. WKS, AMF and DJPM acknowledge funding from NASA Terrestrial Ecosystems Grant 80NSSC19M0103. We also acknowledge support of the data assimilation analysis by DOE Regional and Global Climate Modeling DE-SC0016011 and NSF Macrosystems 1241851. Finally, we acknowledge the useful and stimulating discussions during the Integrating CO2 Fertilization Evidence Streams and Theory (ICOFEST) meeting September, 2018, part of the FACE model Data-Synthesis project funded by the US Department of Energy, Office of Science, Office of Biological and Environmental Research. A portion of this research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under contract with NASA. Support from the Earth Science Division MEaSUREs program is acknowledged. All rights reserved. Publisher Copyright: {\textcopyright} 2019 The Authors. New Phytologist {\textcopyright} 2019 New Phytologist Trust",
year = "2020",
month = jan,
day = "1",
doi = "10.1111/nph.16055",
language = "English (US)",
volume = "225",
pages = "105--112",
journal = "New Phytologist",
issn = "0028-646X",
publisher = "Wiley-Blackwell",
number = "1",
}