Variability in a four-network composite of atmospheric CO2 differences between three primary baseline sites
Roger J. Francey et al.
CSIRO Oceans and Atmosphere GASLAB data October 2018, Commonwealth Scientific and Industrial Research Organisation ftp://gaspublic:email@example.com/pub/data/gaslab/
Cold & Warm Episodes by Season, data from Climate Prediction Center, National Oceanic and Atmospheric Administration 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 ftp://aftp.cmdl.noaa.gov/data/trace_gases/co2/flask/surface/