Resources
3 Datasets 1 Publications
Related Research Areas
Carbon Cycle & Ecosystems, Climate Variability & Change

PNAS_paper Previous studies have highlighted the occurrence and intensity of El Niño–Southern Oscillation as important drivers of the interannual variability of the atmospheric CO2 growth rate, but the underlying biogeophysical mechanisms governing such connections remain unclear. In this study we show a strong and persistent coupling (r2 ≈ 0.50) between interannual variations of the CO2 growth rate and tropical land–surface air temperature during 1959 to 2011, with a 1 °C tropical temperature anomaly leading to a 3.5 ± 0.6 Petagrams of carbon per year (PgC/y) CO2 growth-rate anomaly on average. Analysis of simulation results from Dynamic Global Vegetation Models suggests that this temperature–CO2 coupling is contributed mainly by the additive responses of heterotrophic respiration (Rh) and net primary production (NPP) to temperature variations in tropical ecosystems. However, we find a weaker and less consistent (r2 ≈ 0.25) interannual coupling between CO2 growth rate and tropical land precipitation than diagnosed from the Dynamic Global Vegetation Models, likely resulting from the subtractive responses of tropical Rh and NPP to precipitation anomalies that partly offset each other in the net ecosystem exchange (i. e., net ecosystem exchange ≈ Rh − NPP). Variations in other climate variables (e.g., large-scale cloudiness) and natural disturbances (e.g., volcanic eruptions) may induce transient reductions in the temperature–CO2 coupling, but the relationship is robust during the past 50 y and shows full recovery within a few years after any such major variability event. Therefore, it provides an important diagnostic tool for improved understanding of the contemporary and future global carbon cycle.

Attachments

Tags

Everyone's Tags

Popular Resources

  • NASA GISS surface temperature

    A Dataset, Variations in atmospheric CO2 growth rates coupled with tropical temperature - 9 months ago

    Globally gridded monthly temperature anomalies relative to the base period 1951-1980.

  • long-term records of atmospheric CO2

    A Dataset, Variations in atmospheric CO2 growth rates coupled with tropical temperature - 9 months ago

    Long-term measurement of atmospheric CO2 data started by Dr. C.D. Keeling and continued by scientists at NOAA/ESRL and SIO.

  • The Global Carbon Budget between 1959-2011

    A Dataset, Variations in atmospheric CO2 growth rates coupled with tropical temperature - 9 months ago

    Data set compiled by the global carbon project.

Discussions

Log in to start a discussion.

Project Highlight

1 members / 4 resources

Started: Jul 24, 2013

Last Activity: Jul 24, 2013

Admin:

What can I do on this project?
  • Any registered users can join
  • Anybody can view this project
  • Any registered users can leave comments
  • Anybody can view comments

New Member

Need help?

Visit our help center