A weekly cycle in atmospheric carbon dioxide

Details A weekly cycle in atmospheric carbon dioxide A weekly cycle in atmospheric carbon dioxide

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29b..15c&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 2, pp. 15-1, CiteID 1028, DOI 10.1029/2001GL013952

Statistics

Methodology

5

Atmospheric Composition And Structure: Biosphere/Atmosphere Interactions, Atmospheric Composition And Structure: Pollution-Urban And Regional (0305), Meteorology And Atmospheric Dynamics: Instruments And Techniques, Global Change: Atmosphere (0315, 0325)

Scientific paper

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.

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