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Title: Quantifying spatially and temporally explicit CO2 fertilization effects on global terrestrial ecosystem carbon dynamics

Current terrestrial ecosystem models are usually driven with global average annual atmospheric carbon dioxide (CO2) concentration data at the global scale. However, high-precision CO2 measurement from eddy flux towers showed that seasonal, spatial surface atmospheric CO2 concentration differences were as large as 35 ppmv and the site-level tests indicated that the CO2 variation exhibited different effects on plant photosynthesis. Here we used a process-based ecosystem model driven with two spatially and temporally explicit CO2 data sets to analyze the atmospheric CO2 fertilization effects on the global carbon dynamics of terrestrial ecosystems from 2003 to 2010. Our results demonstrated that CO2 seasonal variation had a negative effect on plant carbon assimilation, while CO2 spatial variation exhibited a positive impact. When both CO2 seasonal and spatial effects were considered, global gross primary production and net ecosystem production were 1.7 Pg C•yr–1 and 0.08 Pg C•yr–1 higher than the simulation using uniformly distributed CO2 data set and the difference was significant in tropical and temperate evergreen broadleaf forest regions. Moreover, this study suggests that the CO2 observation network should be expanded so that the realistic CO2 variation can be incorporated into the land surface models to adequately account for CO2 fertilization effects onmore » global terrestrial ecosystem carbon dynamics.« less
Authors:
 [1] ;  [1] ;  [2] ;  [3]
  1. Purdue Univ., West Lafayette, IN (United States)
  2. Carnegie Institution for Science, Stanford, CA (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725; FG02-08ER64599
Type:
Published Article
Journal Name:
Ecosphere
Additional Journal Information:
Journal Volume: 7; Journal Issue: 7; Journal ID: ISSN 2150-8925
Publisher:
Ecological Society of America
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; atmospheric CO2; carbon dynamics; gross primary production; net ecosystem production; process-based ecosystem model
OSTI Identifier:
1271473
Alternate Identifier(s):
OSTI ID: 1328336; OSTI ID: 1345676