Mike Stewart


Full Name: Mike Stewart

Position: Isotope Scientist (Contractor)

Contact details

Email me here
Phone: +64-4-570 4623


1965: MSc, Physics; 1975: PhD, Geology

Areas of expertise

Geochemist: Groundwater Dating
Geochemist: Hydrogeology
Geochemist: Hydrothermal chemistry
Geochemist: Isotope Geochemistry
Geochemist: Streamflow Generation

Professional activities

American Geophysical Union: Member
Journal of Hydrology New Zealand: Past Editor
National Groundwater Association: Member
New Zealand Hydrological Society: Executive Member
European Geosciences Union: Member

Major publications

Duvert, C.; Stewart, M.K.; Cendon, D.I.; Raiber, M. 2016 Time-series of tritium, stable isotopes and chloride reveal short-term variations in groundwater contribution to a stream. Hydrology and Earth System Sciences, 20(1): 257-277; doi: 10.5194/hess-20-257-2016

Gallart, F.; Roig-Planasdemunt, M.; Stewart, M.K.; Llorens, P.; Morgenstern, U.; Stichler, W.; Pfister, P.; Latron, J. 2016 A GLUE-based uncertainty assessment framework for tritium-inferred transit time estimations under baseflow conditions. Hydrological Processes, 30(25): 4741-4760; doi: 10.1002/hyp.10991

Gusyev, M.A.; Morgenstern, U.; Stewart, M.K.; Yamazaki, Y.; Kashiwaya, K.; Nishibara, T.; Kuribayashi, D.; Sawano, H.; Iwami, Y. 2016 Application of tritium in precipitation and baseflow in Japan : a case study of groundwater transit times and storage in Hokkaido watersheds. Hydrology and Earth System Sciences, 20: 3043-3058; doi: 10.5194/hess-2016-164

Hale, V.C.; McDonnell, J.J.; Stewart, M.K.; Solomon, D.K.; Doolitte, J.; Ice, G.G.; Pack, R.T. 2016 Effect of bedrock permeability on stream base flow mean transit time scaling relationships : 2. Process study of storage and release. Water Resources Research, 52(2): 1375-1397; doi: 10.1002/2015WR017660

Stewart, M.K.; Morgenstern, U. 2016 Importance of tritium-based transit times in hydrological systems. Wiley Interdisciplinary Reviews : Water, 3(2): 145-154; doi: 10.1002/wat2.1134

Lamontagne, S.; Taylor, A.R.; Batlle-Aguilar, J.; Suckow, A.; Cook, P.G.; Smith, S.D.; Morgenstern, U.; Stewart, M.K. 2015 River infiltration to a subtropical alluvial aquifer inferred using multiple environmental tracers. Water Resources Research, 51(6): 4532-4549; doi: 10.1002/2014WR015663

Seltzer, A.M.; Stute, M.; Morgenstern, U.; Stewart, M.K.; Schaefer, J.M. 2015 Mean annual temperature in New Zealand during the last glacial maximum derived from dissolved noble gases in groundwater. Earth and Planetary Science Letters, 431: 206-216; doi: 10.1016/j.epsl.2015.09.032

Stewart, M.K. 2015 Promising new baseflow separation and recession analysis methods applied to streamflow at Glendhu Catchment, New Zealand. Hydrology and Earth System Sciences, 19(6): 2587-2603; doi: 10.5194/hess-19-2587-2015

Gusyev, M.A.; Abrams, D.; Toews, M.W.; Morgenstern, U.; Stewart, M.K. 2014 A comparison of particle-tracking and solute transport methods for simulation of tritium concentrations and groundwater transit times in river water. Hydrology and Earth System Sciences, 18(8): 3109-3119; doi: 10.5194/hess-18-3109-2014

Gusyev, M.A.; Toews, M.W.; Morgenstern, U.; Stewart, M.K.; White, P.A.; Daughney, C.J.; Hadfield, J. 2013 Calibration of a transient transport model to tritium data in streams and simulation of groundwater ages in the western Lake Taupo catchment, New Zealand. Hydrology and Earth System Sciences, 17(3): 1217-1227; doi: 10.5194/hess-17-1217-2013

Stewart, M.K. 2012 A 40-year record of carbon-14 and tritium in the Christchurch groundwater system, New Zealand : dating of young samples with carbon-14. Journal of Hydrology, 430-431: 50-68; doi: 10.1016/j.jhydrol.2012.01.046

Stewart, M.K.; Morgenstern, U.; Mcdonnell, J.J.; Pfister, L. 2012 The ‘hidden streamflow’ challenge in catchment hydrology: a call to action for stream water transit time analysis. Hydrological Processes, 26(13): 2061-2066; doi: 10.1002/hyp.9262

Stewart, M.K.; Stevens, G.; Thomas, J.T.; van der Raaij, R.W.; Trompetter, V. 2011 Nitrate sources and residence times of groundwater in the Waimea Plains, Nelson. Journal of Hydrology, New Zealand, 50(2): 313-338

McDonnell, J.J.; McGuire, K.; Aggarwal, P.; Beven, K.J.; Biondi, D.; Destouni, G.; Dunn, S.; James, A.; Kirchner, J.; Kraft, P.; Lyon, S.; Maloszewski, P.; Newman, B.; Pfister, L.; Rinaldo, A.; Rodhe, A.; Sayama, T.; Seibert, J.; Solomon, K.; Soulsby, C.; Stewart, M.K.; Tetzlaff, D.; Tobin, C.; Troch, P.; Weiler, M.; Western, A.; Woerman, A.; Wrede, S. 2010 How old is streamwater? : open questions in catchment transit time conceptualization, modelling and analysis. Hydrological Processes, 24(12): 1745-1754; doi: 10.1002/hyp.7796

Morgenstern, U.; Stewart, M.K.; Stenger, R. 2010 Dating of streamwater using tritium in a post nuclear bomb pulse world : continuous variation of mean transit time with streamflow. Hydrology and Earth System Sciences, 14(11): 2289-2301; doi: 10.5194/hess-14-2289-2010

Stewart, M.K.; Fahey, B.D. 2010 Runoff generating processes in adjacent tussock grassland and pine plantation catchments as indicated by mean transit time estimation using tritium. Hydrology and Earth System Sciences, 14(6): 1021-1032; doi: 10.5194/hess-14-1021-2010

Stewart, M.K.; Morgenstern, U.; McDonnell, J.J. 2010 Truncation of stream residence time : how the use of stable isotopes has skewed our concept of streamwater age and origin. Hydrological Processes, 24(12): 1646-1659; doi: 10.1002/hyp.7576

Stewart, M.K.; Thomas, J.T. 2008 A conceptual model of flow to the Waikoropupu Springs, NW Nelson, New Zealand, based on hydrometric and tracer (18O, Cl, 3H and CFC) evidence. Hydrology and Earth System Sciences, 12(1): 1-19

Stewart, M.K.; Mehlhorn, J.; Elliott, S. 2007 Hydrometric and natural tracer (oxygen-18, silica, tritium and sulphur hexafluoride) evidence for a dominant groundwater contribution to Pukemanga Stream, New Zealand. Hydrological Processes, 21(24): 3340-3356; doi: 10.1002/hyp.6557

Whitehead, N.E.; Barry, B.J.; Ditchburn, R.G.; Morris, C.J.; Stewart, M.K. 2007 Systematics of radon at the Wairakei geothermal region, New Zealand. Journal of environmental radioactivity, 92(1): 16-29; doi: 10.1016/j.jenvrad.2006.09.003

Close, M.E.; Lee, R.; Magesan, G.N.; Stewart, M.K.; Skuse, G.; Bekesi, G. 2005 Field study of pesticide leaching in a Himatangi sand (Manawatu) and in a Kiripaka bouldery clay loam (Northland). 1, Results. Australian journal of soil research, 43(4): 457-469

Stewart, M.K.; Thomas, J.T.; Norris, M.W.; Trompetter, V.J. 2004 Paleogroundwater in the Moutere Gravel Aquifers near Nelson, New Zealand. Radiocarbon, 46(2): 517-529

McGlynn, B.; McDonnell, J.; Stewart, M.K.; Seibert, J. 2003 On the relationships between catchment scale and streamwater mean residence time. Hydrological Processes, 17(1): 175-181

Christenson, B.W.; Mroczek, E.K.; Kennedy, B.M.; van Soest, M.C.; Stewart, M.K.; Lyon, G.L. 2002 Ohaaki reservoir chemistry : characteristics of an arc-type hydrothermal system in the Taupo Volcanic Zone, New Zealand. Journal of Volcanology and Geothermal Research, 115(1-2): 53-82; doi: 10.1016/S0377-0273(01)00309-2

Stewart, M.K.; Thomas, J.T. 2002 Moutere Valley groundwater : nature and recharge from isotopes and chemistry. Lower Hutt: Institute of Geological & Nuclear Sciences Limited. Institute of Geological & Nuclear Sciences science report 2002/22. 26 p.

Stewart, M.K.; Trompetter, V.J.; van der Raaij, R.W. 2002 Age and source of Canterbury Plains groundwater. Christchurch: Environment Canterbury. 46 p.

Stewart, M.K.; Morgenstern, U. 2001 Age and source of groundwater from isotope tracers. p. 161-183 IN: Rosen, M.R.; White, P.A. (eds.) Groundwaters of New Zealand. Wellington: New Zealand Hydrological Society

McDonnell, J.; Rowe, L.; Stewart, M.K. 1999 A combined tracer-hydrometric approach to assess the effect of catchment scale on water flow path, source and age. p. 265-273 IN: Leibundgut, C. (ed.); McDonnell, J. (ed.); Schultz, G. (ed.) Integrated methods in catchment hydrology : tracer, remote sensing and new hydrometric techniques. Wallingford, England: IAHS. IAHS publication 258.

Rosen, M.R.; Bright, J.; Carran, P.; Stewart, M.K.; Reeves, R.R. 1999 Estimating rainfall recharge and soil water residence times in Pukekohe, New Zealand, by combining geophysical, chemical and isotopic methods. Ground water, 37(6): 836-844

Unnikrishna, P.V.; McDonnell, J.J.; Stewart, M.K. 1995 Soil water isotopic residence time modelling. p. 237-260 IN: Trudgill, S.T. Solute modelling in catchment systems. Chichester, UK: Wiley & sons

Giggenbach, W.F.; Sheppard, D.S.; Robinson, B.W.; Stewart, M.K.; Lyon, G.L. 1994 Geochemical structure and position of the Waiotapu Geothermal Field, New Zealand. Geothermics, 23(5/6): 599-644; doi: 10.1016/0375-6505(94)90022-1

Simmons, S.F.; Stewart, M.K.; Robinson, B.W.; Glover, R.B. 1994 The chemical and isotopic compositions of thermal waters at Waimangu, New Zealand. Geothermics, 23(5/6): 539-553; doi: 10.1016/0375-6505(94)90018-3

Stewart, M.K.; Lyon, G.L.; Robinson, B.W.; Glover, R.B. 1992 Fluid flow in the Rotorua geothermal field derived from isotopic and chemical data. Geothermics, 21(1/2): 141-163; doi: 10.1016/0375-6505(92)90074-J

McDonnell, J.J.; Owens, I.F.; Stewart, M.K. 1991 A case study of shallow flow paths in a steep zero-order basin. Water resources bulletin, 27(4): 679-685

McDonnell, J.J.; Stewart, M.K.; Owens, I.F. 1991 Effect of catchment-scale subsurface mixing on stream isotopic response. Water Resources Research, 27(12): 3065-3073

Stewart, M.K.; McDonnell, J.J. 1991 Modeling base flow soil water residence times from deuterium concentrations. Water Resources Research, 27(10): 2681-2693

Bonell, M.; Pearce, A.J.; Stewart, M.K. 1990 The identification of runoff-production mechanisms using environmental isotopes in a tussock grassland catchment, eastern Otago, New Zealand. Hydrological Processes, 4(1): 15-34

Hedenquist, J.W.; Goff, R.; Phillips, F.M.; Elmore, D.; Stewart, M.K. 1990 Groundwater dilution and residence times and constraints on chloride source, in the Mokai geothermal system, New Zealand, from chemical, stable isotope, tritium and 36Cl data. Journal of Geophysical Research. Solid Earth and Planets, 95(B12): 19,365-19,375

McDonnell, J.J.; Bonell, M.; Stewart, M.K.; Pearce, A.J. 1990 Deuterium variations in storm rainfall : implications for stream hydrograph separation. Water Resources Research, 26(3): 455-458

Taylor, C.B.; Wilson, D.D.; Brown, L.J.; Stewart, M.K.; Burden, R.J.; Brailsford, G.W. 1989 Sources and flow of north Canterbury Plains groundwater, New Zealand. Journal of Hydrology, 106(3/4): 311-340; doi: 10.1016/0022-1694(89)90078-4

Pearce, A.J.; Stewart, M.K.; Sklash, M.G. 1986 Storm runoff generation in humid headwater catchments ; 1. Where does the water come from? Water Resources Research, 22(8): 1263-1272

Sklash, M.G.; Stewart, M.K.; Pearce, A.J. 1986 Storm runoff generation in humid headwater catchments ; 2. A case study of hillslope and low-order stream response. Water Resources Research, 22(8): 1273-1282

Henley, R.W.; Stewart, M.K. 1983 Chemical and isotopic changes in the hydrology of the Tauhara geothermal field due to exploitation at Wairakei. Journal of Volcanology and Geothermal Research, 15(4): 285-314; doi: 10.1016/0377-0273(83)90104-X

Stewart, M.K.; Cox, M.A.; James, M.R.; Lyon, G.L. 1983 Deuterium in New Zealand rivers and streams. Lower Hutt: DSIR, Institute of Nuclear Sciences. Institute of Nuclear Sciences INS-R-- 320. 42 p

Giggenbach, W.F.; Stewart, M.K. 1982 Processes controlling the isotopic composition of steam and water discharges from steam vents and steam-heated pools in geothermal areas. Geothermics, 11(2): 71-80; doi: 10.1016/0375-6505(82)90009-8

Hulston, J.R.; Taylor, C.B.; Lyon, G.L.; Stewart, M.K.; Cox, M.A. 1981 Environmental isotopes in New Zealand hydrology ; 2. Standards, measurement techniques, and reporting of measurements for oxygen-18, deuterium, and tritium in water. New Zealand journal of science, 24(3/4): 313-322

Stewart, M.K.; Dicker, M.J.I.; Johnston, M.R. 1981 Environmental isotopes in New Zealand hydrology ; 4. Oxygen isotope variations in subsurface waters of the Waimea Plains, Nelson. New Zealand journal of science, 24(3/4): 339-348

Stewart, M.K.; Taylor, C.B. 1981 Environmental isotopes in New Zealand hydrology ; 1. Introduction. The role of oxygen-18, deuterium, and tritium in hydrology. New Zealand journal of science, 24(3/4): 295-311

Stewart, M.K.; Williams, P.W. 1981 Environmental isotopes in New Zealand hydrology ; 3. Isotope hydrology of the Waikoropupu Springs and Takaka River, northwest Nelson. New Zealand journal of science, 24(3/4): 323-337

Stewart, M.K. 1978 Stable isotopes in waters from the Wairakei geothermal area, New Zealand. p. 113-119 IN: Robinson, B.W. Stable isotopes in the earth sciences. Wellington: DSIR. DSIR Bulletin 220.

Stewart, M.K. 1975 Stable isotope fractionation due to evaporation and isotopic exchange of falling waterdrops : applications to atmospheric processes and evaporation of lakes. Journal of Geophysical Research, 80(9): 1133-1146

Stewart, M.K.; Friedman, I. 1975 Deuterium fractionation between aqueous salt solutions and water vapor. Journal of Geophysical Research, 80(27): 3812-3818

Stewart, M.K.; Hulston, J.R. 1975 Stable isotope ratios of volcanic steam from White Island, New Zealand. Bulletin volcanologique, 39(1): 28-46

Stewart, M.K. 1974 Hydrogen and oxygen isotope fractionation during crystallization of mirabilite and ice. Geochimica et Cosmochimica Acta, 38(1): 167-172

Bailey, I.H.; Macklin, W.C.; Hulston, J.R.; Stewart, M.K. 1969 On the isotopic composition of hailstones. Journal of the atmospheric sciences, 26(4): 689-694

Clarke, A.M.; Chirnside, A.; Hill, G.L.; Pope, G.; Stewart, M.K. 1967 Chronic dehydration and sodium depletion in patients with established ileostomies. Lancet, (7519): 740-743

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