Abstract
Responses of atmospheric carbon dioxide (CO<sub>2</sub>) density to geomagnetic secular variation are investigated using the Whole Atmosphere Community Climate Model-eXtended (WACCM-X). Our ensemble simulations show that CO<sub>2</sub> volume mixing ratios (VMRs) increase at high latitudes and decrease at mid and low latitudes by several ppmv in response to a 50% weakening of the geomagnetic field. Statistically significant changes in CO<sub>2</sub> are mainly found above ~90 km altitude and primarily redetermine the energy budget at ~100–110 km. Our analysis of transformed Eulerian mean (TEM) circulation found that CO<sub>2</sub> change is caused by enhanced upwelling at high latitudes and downwelling at mid and low latitudes as a result of increased Joule heating. We further analyzed the atmospheric CO<sub>2</sub> response to realistic geomagnetic weakening between 1978 and 2013, and found increasing (decreasing) CO<sub>2</sub> VMRs at high latitudes (mid and low latitudes) accordingly. For the first time, our simulation results demonstrate that the impact of geomagnetic variation on atmospheric CO<sub>2</sub> distribution is noticeable on a time scale of decades.
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