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128192 https://hdl.handle.net/2286/R.I.44922 <p>Zhang, X., Gurney, K. R., Rayner, P., Baker, D., &amp; Liu, Y. (2016). Sensitivity of simulated CO2 concentration to sub-annual variations in fossil fuel CO2 emissions. Atmospheric Chemistry and Physics, 16(4), 1907-1918. doi:10.5194/acp-16-1907-2016</p> 10.5194/acp-16-1907-2016 1680-7316 1680-7324 http://rightsstatements.org/vocab/InC/1.0/ open access http://creativecommons.org/licenses/by/4.0 2016-02-19 12 pages eng Zhang, Xia Gurney, Kevin Rayner, Peter Baker, David Liu, Yu-ping College of Liberal Arts and Sciences This article and any associated published material is distributed under the Creative Commons Attribution 3.0 License. View the article as published at: https://www.atmos-chem-phys.net/16/1907/2016/ <p>Recent advances in fossil fuel CO₂ (FFCO₂) emission inventories enable sensitivity tests of simulated atmospheric CO₂ concentrations to sub-annual variations in FFCO₂ emissions and what this implies for the interpretation of observed CO₂. Six experiments are conducted to investigate the potential impact of three cycles of FFCO₂ emission variability (diurnal, weekly and monthly) using a global tracer transport model. Results show an annual FFCO₂ rectification varying from −1.35 to +0.13 ppm from the combination of all three cycles. This rectification is driven by a large negative diurnal FFCO₂ rectification due to the covariation of diurnal FFCO₂ emissions and diurnal vertical mixing, as well as a smaller positive seasonal FFCO₂ rectification driven by the covariation of monthly FFCO₂ emissions and monthly atmospheric transport. The diurnal FFCO₂ emissions are responsible for a diurnal FFCO₂ concentration amplitude of up to 9.12 ppm at the grid cell scale. Similarly, the monthly FFCO₂ emissions are responsible for a simulated seasonal CO₂ amplitude of up to 6.11 ppm at the grid cell scale. The impact of the diurnal FFCO₂ emissions, when only sampled in the local afternoon, is also important, causing an increase of +1.13 ppmv at the grid cell scale. The simulated CO₂ concentration impacts from the diurnally and seasonally varying FFCO₂ emissions are centered over large source regions in the Northern Hemisphere, extending to downwind regions. This study demonstrates the influence of sub-annual variations in FFCO₂ emissions on simulated CO₂ concentration and suggests that inversion studies must take account of these variations in the affected regions.</p> Text Sensitivity of Simulated CO2 Concentration to Sub-Annual Variations in Fossil Fuel CO2 Emissions