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Effect of heterogeneous atmospheric CO2 on simulated global carbon budget

February 10, 2013

The effects of rising atmospheric carbon dioxide (CO2) on terrestrial carbon (C) sequestration have been a key focus in global change studies. As anthropological CO2 emissions substantially increase, the spatial variability of atmospheric CO2 should be considered to reduce the potential bias on C source and sink estimations. In this study, the global spatial–temporal patterns of near surface CO2 concentrations for the period 2003-2009 were established using the SCIAMACHY satellite observations and the GLOBALVIEW-CO2 field observations. With this CO2 data and the Integrated Biosphere Simulator (IBIS), our estimation of the global mean annual NPP and NEP was 0.5% and 7% respectively which differs from the traditional C sequestration assessments. The Amazon, Southeast Asia, and Tropical Africa showed higher C sequestration than the traditional assessment, and the rest of the areas around the world showed slightly lower C sequestration than the traditional assessment. We find that the variability of NEP is less intense under heterogeneous CO2 pattern on a global scale. Further studies of the cause of CO2 variation and the interactions between natural and anthropogenic processes of C sequestration are needed.

Publication Year 2013
Title Effect of heterogeneous atmospheric CO2 on simulated global carbon budget
DOI 10.1016/j.gloplacha.2012.12.002
Authors Zhen Zhang, Hong Jiang, Jinxun Liu, Weimin Ju, Xiuying Zhang
Publication Type Article
Publication Subtype Journal Article
Series Title Global and Planetary Change
Index ID 70043284
Record Source USGS Publications Warehouse
USGS Organization Earth Resources Observation and Science (EROS) Center