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Increased light-use efficiency in northern terrestrial ecosystems indicated by CO2 and greening observations
File | Description | Size | Format | |
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Thomas_et_al-2016-Geophysical_Research_Letters.pdf | Published version | 876.49 kB | Adobe PDF | View/Open |
Title: | Increased light-use efficiency in northern terrestrial ecosystems indicated by CO2 and greening observations |
Authors: | Thomas, RT Prentice, IC Graven, H Ciais, P Fisher, JB Hayes, DJ Huang, M Huntzinger, DN Ito, A Jain, A Mao, J Michalak, AM Peng, S Poulter, B Ricciuto, DM Shi, X Schwalm, C Tian, H Zeng, N |
Item Type: | Journal Article |
Abstract: | 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. |
Issue Date: | 4-Nov-2016 |
Date of Acceptance: | 12-Oct-2016 |
URI: | http://hdl.handle.net/10044/1/41702 |
DOI: | https://dx.doi.org/10.1002/2016GL070710 |
ISSN: | 1944-8007 |
Publisher: | American Geophysical Union (AGU) |
Start Page: | 11339 |
End Page: | 11349 |
Journal / Book Title: | Geophysical Research Letters |
Volume: | 43 |
Issue: | 21 |
Copyright Statement: | © 2016. American Geophysical Union. All Rights R eserved. |
Sponsor/Funder: | AXA Research Fund |
Funder's Grant Number: | AXA Chair Programme in Biosphere and Climate Impacts |
Keywords: | Science & Technology Physical Sciences Geosciences, Multidisciplinary Geology ATMOSPHERIC CARBON-DIOXIDE MODEL INTERCOMPARISON PROJECT PROGRAM MULTISCALE SYNTHESIS SEASONAL AMPLITUDE BIOSPHERE MODELS ELEVATED CO2 LAND-USE VEGETATION TRENDS CLIMATE Meteorology & Atmospheric Sciences MD Multidisciplinary |
Publication Status: | Published |
Appears in Collections: | Space and Atmospheric Physics Physics Department of Life Sciences Grantham Institute for Climate Change Faculty of Natural Sciences |