Daniel Sinclair¹, Nicholas T Hitt¹, Helen Neil², Stewart Fallon³, Aimee K Komugabe-Dixson⁴, John Charles Hellstrom⁵ and Sarah Bury², (1)Victoria University of Wellington, School of Geography Environment and Earth Sciences, Wellington, New Zealand, (2)National Institute of Water and Atmospheric Research, Wellington, New Zealand, (3)The Australian National University, Research School of Earth Sciences, Canberra, Australia, (4)Ministry of Primary Industries, Auckland, New Zealand, (5)University of Melbourne, School of Earth Sciences, Parkville, VIC 3010, Australia