Solar dimming and CO2 effects on soil moisture trends
Article first published online: 28 OCT 2006
Copyright 2006 by the American Geophysical Union.
Geophysical Research Letters
Volume 33, Issue 20, October 2006
How to Cite
2006), Solar dimming and CO2 effects on soil moisture trends, Geophys. Res. Lett., 33, L20708, doi:10.1029/2006GL027585., and (
- Issue published online: 28 OCT 2006
- Article first published online: 28 OCT 2006
- Manuscript Accepted: 12 SEP 2006
- Manuscript Revised: 7 SEP 2006
- Manuscript Received: 15 JUL 2006
 Summer soil moisture increased significantly from 1958 to the mid 1990s in Ukraine and Russia. This trend cannot be explained by changes in precipitation and temperature alone. To investigate the possible contribution from solar dimming and upward CO2 trends, we conducted experiments with a sophisticated land surface model. We demonstrate, by imposing a downward trend in incoming shortwave radiation forcing to mimic the observed dimming, that the observed soil moisture pattern can be well reproduced. On the other hand, the effects of upward CO2 trends were relatively small for the study period. Our results suggest tropospheric air pollution plays an important role in land water storage at the regional scale, and needs to be addressed accurately to study the effects of global warming on water resources.