@article{Thomas:2016:10.1002/2016GL070710,
author = {Thomas, RT and Prentice, IC and Graven, H and Ciais, P and Fisher, JB and Hayes, DJ and Huang, M and Huntzinger, DN and Ito, A and Jain, A and Mao, J and Michalak, AM and Peng, S and Poulter, B and Ricciuto, DM and Shi, X and Schwalm, C and Tian, H and Zeng, N},
doi = {10.1002/2016GL070710},
journal = {Geophysical Research Letters},
pages = {11339--11349},
title = {Increased light-use efficiency in northern terrestrial ecosystems indicated by CO2 and greening observations},
url = {http://dx.doi.org/10.1002/2016GL070710},
volume = {43},
year = {2016}
}

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TY  - JOUR
AB  - Observations show an increasing amplitude in the seasonal cycle of CO2 (ASC) north of 45°N of 56 ± 9.8% over the last 50 years and an increase in vegetation greenness of 7.5–15% in high northern latitudes since the 1980s. However, the causes of these changes remain uncertain. Historical simulations from terrestrial biosphere models in the Multiscale Synthesis and Terrestrial Model Intercomparison Project are compared to the ASC and greenness observations, using the TM3 atmospheric transport model to translate surface fluxes into CO2 concentrations. We find that the modeled change in ASC is too small but the mean greening trend is generally captured. Modeled increases in greenness are primarily driven by warming, whereas ASC changes are primarily driven by increasing CO2. We suggest that increases in ecosystem-scale light use efficiency (LUE) have contributed to the observed ASC increase but are underestimated by current models. We highlight potential mechanisms that could increase modeled LUE.
AU  - Thomas,RT
AU  - Prentice,IC
AU  - Graven,H
AU  - Ciais,P
AU  - Fisher,JB
AU  - Hayes,DJ
AU  - Huang,M
AU  - Huntzinger,DN
AU  - Ito,A
AU  - Jain,A
AU  - Mao,J
AU  - Michalak,AM
AU  - Peng,S
AU  - Poulter,B
AU  - Ricciuto,DM
AU  - Shi,X
AU  - Schwalm,C
AU  - Tian,H
AU  - Zeng,N
DO  - 10.1002/2016GL070710
EP  - 11349
PY  - 2016///
SN  - 1944-8007
SP  - 11339
TI  - Increased light-use efficiency in northern terrestrial ecosystems indicated by CO2 and greening observations
T2  - Geophysical Research Letters
UR  - http://dx.doi.org/10.1002/2016GL070710
UR  - http://hdl.handle.net/10044/1/41702
VL  - 43
ER  - 

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