1. Atmospheric Science Program, Department of Geography, Indiana University, Bloomington, IN 47405, USA;
2. Department of Wind Energy and Atmospheric Physics, Risø National Laboratory, Roskilde, Denmark;
3. Atmospheric Science Research Group, The University of Manchester, Manchester M60 1QD, UK;
4. Department of Geography & Environmental Sciences, University of Colorado at Denver, Denver, CO 80217, USA;
5. Institute for Energy Systems, School of Engineering, University of Edinburgh, Edinburgh EH9 3JL, UK;
6. Centre for Ecology and Hydrology, Bush Estate, Penicuik, Midlothian EH26 0QB, UK;
7. Department of Physical Sciences, University of Helsinki, Helsinki, Finland