1. Energy Research Institute of the Netherlands, Westerduinweg 3, 1755 ZG Petten, The Netherlands
2. Institute for Marine and Atmospheric Research Utrecht (IMAU), Princetonplein 5, 3584 CC Utrecht, The Netherlands. DOI: 10.1111/j.1600-0889.2007.00266.x
3. Hydrological Sciences Branch, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA