[1] Victoria Univ Wellington, Sch Econ & Finance, Wellington, New Zealand
[2] Lawrence Berkeley Natl Lab, Appl Math & Computat Res Div, Lawrence, KS USA
[3] Natl Inst Water & Atmospher Res, Wellington, New Zealand
[4] Univ Canterbury, Sch Phys & Chem Sci, Christchurch, New Zealand
[5] Univ Cape Town, African Climate & Dev Initiat, Cape Town, South Africa
[6] African Ctr Meteorol Applicat Dev, Niamey, Niger
[7] Reserve Bank New Zealand, Wellington, New Zealand