MLO and PTB amplitude and phase

Description

Observed peak-to-trough of amplitude and phase based on day of year of downward zero crossing of CO2 at Barrow, Alaska (71.3°N, blue dots, right axis) and Mauna Loa, Hawaii (19.5°N, black dots, left axis) as measured by the Scripps CO₂ program and the National Oceanic and Atmospheric Administration Global Monitoring Division, based on methods in Graven et al (2013). Phase is calculated as the Julian date of the downward zero crossing.

PTB data are from NOAA (https://gml.noaa.gov/aftp/data/trace_gases/co2/in-situ/surface/brw/co2_brw_surface-insitu_1_ccgg_DailyData.txt) and MLO data are from the Scripps CO2 program

NOAA PTB dataset citation: K.W. Thoning, A.M. Crotwell, and J.W. Mund (2021), Atmospheric Carbon Dioxide Dry Air Mole Fractions from continuous measurements at Mauna Loa, Hawaii, Barrow, Alaska, American Samoa and South Pole. 1973-2019, Version 2021-02 National Oceanic and Atmospheric Administration (NOAA), Global Monitoring Laboratory (GML), Boulder, Colorado, USA https://doi.org/10.15138/yaf1-bk21 FTP path: ftp://aftp.cmdl.noaa.gov/data/greenhouse_gases/co2/in-situ/surface/

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Please direct queries to Ralph Keeling (rkeeling@ucsd.edu)