Cloud feedbacks constitute the greatest uncertainty in future climate projections. In this project, cloud feedbacks will be studied in the context of inter-hemispheric albedo symmetry. Given the asymmetry between the northern and southern hemispheres (NH and SH) in terms of both land fraction and aerosol amount, the albedo of the NH may be expected to exceed that of the SH, but observations indicate that there is a very close albedo symmetry between the hemispheres. This suggests that clouds compensate for the underlying asymmetries nearly perfectly. Poor model representation of the albedo symmetry may hence indicate failure to capture important cloud feedbacks and thereby misestimation of climate sensitivity.
In this project, funded by the Swedish Research Council (Vetenskapsrådet), we will investigate the hemispheric albedo symmetry and the processes maintaining it; seeking to identify and quantify fundamental feedbacks in the climate system, upholding the hemispheric symmetry. We will use satellite observations to investigate the stability of the symmetry over time, and climate model experiments to isolate relevant adjustments in cloud properties and processes.
The successful candidate will be conducting research related to cloud feedbacks with a global climate model as the main tool. The model in use in the research group is NorESM, but the candidate may also propose other model options.
Postdoctoral positions are appointed primarily for purposes of research. Applicants are expected to hold a Swedish doctoral degree or an equivalent degree from another country.