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A Weekly Cycle in Atmospheric Carbon Dioxide

Published

Author(s)

R S. Cerveny, Kevin Coakley

Abstract

We present a new statistic called the Mean Symmetrized Residual (MSR) for detection and quantification of a weekly cycle in measured daily atmospheric carbon dioxide (CO2). At the Mauna Loa Observatory in Hawaii, we conclude that CO2 concentrations, on average, are significantly lower (0.022 parts per million by volume, ppmv) on weekends (Saturday-Sunday) than during the rest of the week. Over the past twenty-five years, the variation of the mean values of MSR (as a function of day of the week) has been relatively stable. We speculate that the observed weekday/weekend variation in CO2 at Mauna Loa is the result of anthropogenic emissions on Hawaii and nearby sources. We do not detect a weekly cycle in daily CO2 concentration measured at South Pole, Antarctica. This methodology has applicability to a variety of datasets.
Citation
Geophysical Research Letters
Volume
29
Issue
No. 2

Keywords

atmospheric carbon dioxide, bootstrap, stochastic modeling, subsampling, time series, trend detection, weekly cycle

Citation

Cerveny, R. and Coakley, K. (2002), A Weekly Cycle in Atmospheric Carbon Dioxide, Geophysical Research Letters (Accessed May 30, 2024)

Issues

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Created December 31, 2001, Updated October 12, 2021