1. Department of Physical Geography, Stockholm University, Sweden Bolin Centre for Climate Research, Stockholm University, Sweden e-mail: elin.norstrom@natgeo.su.se
2. Bolin Centre for Climate Research, Stockholm University, Sweden Department of Geological Sciences, Stockholm University, Sweden e-mail: malin.kylander@geo.su.se
3. Geology Department, University of Eduardo Mondlane, Mozambique e-mail: sandrasitoe@yahoo.com.br
4. School of Agricultural, Earth and Environmental Sciences, University of KwaZulu-Natal, South Africa e-mail: finchj@ukzn.ac.za