Variability in a four-network composite of atmospheric CO<sub>2</sub> differences between three primary baseline sites

Francey, Roger J.; Frederiksen, Jorgen S.; Steele, L. Paul; Langenfelds, Ray L.

doi:https://doi.org/10.5194/acp-19-14741-2019

Articles | Volume 19, issue 23

https://doi.org/10.5194/acp-19-14741-2019

© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue:

The 10th International Carbon Dioxide Conference (ICDC10)...

https://doi.org/10.5194/acp-19-14741-2019

© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 19, issue 23

Research article

|

09 Dec 2019

Research article |

| 09 Dec 2019

Variability in a four-network composite of atmospheric CO₂ differences between three primary baseline sites

Roger J. Francey, Jorgen S. Frederiksen, L. Paul Steele, and Ray L. Langenfelds

Supplement

https://doi.org/10.5194/acp-19-14741-2019-supplement

Data sets

CSIRO Oceans and Atmosphere GASLAB data October 2018, Commonwealth Scientific and Industrial Research Organisation CSIRO ftp://gaspublic:gaspublic@pftp.csiro.au/pub/data/gaslab/

Cold & Warm Episodes by Season, data from Climate Prediction Center, National Oceanic and Atmospheric Administration NOAA https://origin.cpc.ncep.noaa.gov/products/analysis_monitoring/ensostuff/ONI_v5.php

Atmospheric Carbon Dioxide Dry Air Mole Fractions from the NOAA ESRL Carbon Cycle Cooperative Global Air Sampling Network, 1968-2013 E. J. Dlugokencky, P. M. Lang, K. A. Masarie, A. M. Crotwell, and M. J. Crotwell ftp://aftp.cmdl.noaa.gov/data/trace_gases/co2/flask/surface/

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Short summary

25-year composites of interhemispheric baseline CO₂ differences demonstrate close agreement between 4 monitoring networks. Variability from monthly to multiyear time frames mostly reflects variability in upper troposphere dynamical indices chosen to represent eddy and mean transport interhemispheric exchange. Monthly interhemispheric atmospheric fluxes are much larger than air–surface terrestrial exchanges. The composite differences offer unusual constraints on transport in global carbon models.

Variability in a four-network composite of atmospheric CO2 differences between three primary baseline sites

Supplement

Data sets

Variability in a four-network composite of atmospheric CO₂ differences between three primary baseline sites