An Intraseasonal Variability in CO 2 Over the Arctic Induced by the Madden‐Julian Oscillation

Abstract Variability of atmospheric CO 2 must be well understood for us to better characterize the anthropogenic CO 2 release from the surface. A previous study revealed the influence of the Madden‐Julian Oscillation (MJO) to tropical midtropospheric CO 2 via convection. In this work, the observations by NASA's Atmospheric Infrared Sounder are used to further examine the MJO impact on the CO 2 concentration over the Arctic. A composite analysis shows that the CO 2 north of 60°N varies with a peak‐to‐peak amplitude of 1.2 ± 0.2 ppm over the MJO cycle. An empirical correlation analysis is applied to examine possible effects of retrieval bias and dynamics on the MJO‐related CO 2 anomalies. It is shown that the spatial pattern of the MJO‐related Arctic CO 2 anomalies closely resembles that of the isentropic potential vorticity anomalies at 475 K.