We welcome the comments by Quaas et al. (1). In our paper (2), we used a model to show that the methods used to estimate indirect aerosol forcing using satellite data, especially those based on relating the slope of present-day (PD) drop number (Nc) to aerosol optical depth (AOD), underestimate the forcing calculated when both PD and preindustrial (PI) data are available.
Revised: October 11, 2012 |
Published: November 15, 2011
Citation
Penner J.E., C. Zhou, L. Xu, and M. Wang. 2011.Reply to Quaas et al.: Can satellites be used to estimate indirect climate forcing by aerosols?.Proceedings of the National Academy of Sciences of the United States of America 108, no. 46:E1100-E1101.PNNL-SA-90633.doi:10.1073/pnas.1116135108