Climate change, paleoclimate, stable isotope geochemistry
12 Science I
Department of Geological and Atmospheric Sciences
Iowa State University
Ames, IA 50011-3212
Phone: (515) 294-5142
Fax: (515) 294-6049
B.A. Earth Sciences Teaching, University of New Hampshire, 1997
M.A.T. Secondary Education, University of New Hampshire, 1998
Ph.D. Earth Sciences, University of Maine, 2007
My research is largely focused on documenting and understanding past climates and ecosystems, especially in the high latitudes of the Arctic and North Atlantic region. I am interested in developing new geochemical tools and proxy records for paleoclimatic applications. For my research, I primarily utilize light stable isotopes in both biogenic and inorganic carbonates. I direct the Stable Isotope Laboratory in the Department of Geological and Atmospheric Sciences.
Wanamaker Research Group Website: SIPERG
- Climate variability and mechanisms of climate change with a focus on mid-to-high latitudes.
- Dynamics of atmospheric and oceanic shifts in the North Atlantic region during recent climate anomalies, especially during the Medieval Climate Anomaly and the Little Ice Age transition.
- Carbon dynamics, cycling, and anthropogenic impacts (e.g., ocean acidification, 13C Suess effect) on Earth systems. Radiocarbon as a tracer of ocean circulation.
- Paleohydroclimate using oxygen and carbon isotopes derived from speleothems.
- Isotope geochemistry and clumped isotope geochemistry in biogenic carbonates.
- Biomineralization in carbonates, and the development of new geochemical techniques and proxies using mollusks, corals, and corallines.
- Sclerochronology and isotope geochemistry of long-lived biogenic carbonates, and the development of advanced sclerochronology techniques.
- Development of paleothermometry techniques using the isotope and elemental geochemistry from biocarbonates.
Current Research Grants
NSF, “Collaborative research: Exploring the role of oceanic and atmospheric forcing on Arctic marine climate from newly developed annual shell based records in coastal Norway” (PI, start date- 01 August 2014, end date- 31 July 2017).
NSF, “Collaborative Research: Stabilized Organic Carbon and Paleoenvironmental Interpretations of Late Quaternary Paleosols” (co-PI, start date- 15 August 2012, end date- 14 August 2015).
Signature Research Initiative award
ISU, College of Liberal Arts and Sciences, Signature Theme: Economic, environmental and societal sustainability.
William Gutowski, PI. “Water and Climate Change (WACC): Building Community Consensus for a Sustainable Future for Iowa and the World.” Co-PIs: Kristie Franz, Bill Simpkins, Al Wanamaker (Geological & Atmospheric Sciences), Jean Goodwin (English), Chris Rehmann (Civil, Construction & Environmental Engineering), and Leigh Tesfatison (Economics); start date- 1 July 2013, end date- 30 June 2016.
Natural Environment Research Council (UK), “Ultra-high-resolution proxy record of last millennium North Atlantic temperature anomalies” (PIs, Chris Richardson and James Scourse [Bangor University], Iain Hall [Cardiff University]; start date- 1 January 2011, end date- 31 December 2014). Role: Visiting Researcher.
Marie Curie Initial Training Network (EU), “Annually-resolved archives of marine climate change (ARAMACC)- development of molluscan sclerochronology for marine environmental monitoring and climatology” (PIs, James Scourse, Chris Richardson, Paul Butler [Bangor University], with seven other EU partners; start date- 1 September 2013, end date- 31 August 2017). Role: Visiting Researcher.
Recently Expired Research Grants
NSF, “P2C2: Collaborative research: Construction of a continuous, high resolution and absolutely-dated marine chronology from the Gulf of Maine during the last millennium” (PI, start date- 15 July 2010, end date- 14 July 2013; no cost extension through 30 June 2014).
- Introduction to Oceanography (GEOL 108/ ENV S 108), fall semesters
- Stable Isotopes in the Environment (GEOL 426/526), alternating spring semesters (S2016)
- Paleoclimatology (GEOL 415/515), alternating spring semesters (S2017)
- Principles of Radiometric Dating (GEOL 430/530), spring semesters (S2016)
- Graduate Seminar: The role of polar regions on Earth’s climate (GEOL 590N), fall 2012
Peer-Reviewed Publications * = student author and advisee of Wanamaker; # = student author
Denniston, R.F., Villarini, G., Gonzales, A.N., Polyak, V.J., Ummenhofer, C.C., Lachniet, M.S., Wanamaker, A.D., Jr., Humphreys, W.F., Woods, D., and Cugley, J., (2015) Reply to Nott: Assessing biases in speleothem records of flood events, Proceedings of the National Academy of Sciences, 112(34), E4637, doi: 10.1073/pnas.1513354112.
Denniston, R.F., Villarini, G., Gonzales, A.N., Wyrwoll, K.-H., Polyak, V.J., Ummenhofer, C.C., Lachniet, M.S., Wanamaker, A.D., Jr., Humphreys, W.F., Woods, D., and Cugley, J., (2015) Extreme rainfall activity in the Australian tropics reflects changes in the El Niño/Southern Oscillation over the last two millennia, Proceedings of the National Academy of Sciences, 112(15), 4576-4581, doi:10.1073/pnas.1422270112.
#Liu, Y.-W., Aciego, S. M., and Wanamaker, A.D., Jr., (2015) Environmental controls on the boron and strontium isotopic composition of aragonite shell material of cultured Arctica islandica, Biogeosciences, 12, 3351-3368, doi:10.5194/bg-12-3351-2015..
#Wamboldt, J.M., Wanamaker, A.D., Jr., and Morris, J.E. (2015) Commercial Diets in Phase I Palmetto Bass, Morone saxatilis × M. chrysops Production in Plastic-Lined Ponds: Fertilizer or Feed?, Journal of the World Aquaculture Society, 46(5), 490-504.
Hill, M.G., Hawley, M.F., Widga, C.C., Halverson Monahan, L.A., and Wanamaker, A.D., Jr., (2014) The Nye Bison Site, Polk County, Wisconsin: Paleozoology, investigative incursions, and the search for early man in the upper Midwest. The Wisconsin Archeologist, 95(2), 200-238.
Butler, P. G., Wanamaker, A.D., Jr., Scourse, J.D., Richardson, C.A., and Reynolds, D.R., (2013) Variability of marine climate on the North Icelandic Shelf in a 1357-year proxy archive based on growth increments in the bivalve Arctica islandica, Palaeogeography, Palaeclimatology, Palaeoecology, 373, 141-151, doi:10.1016/j.palaeo.2012.01.016.
Cunningham, L.K., Austin, W.E.N., Knudsen, K.L., Eiríksson, J. Scourse, J.D., Wanamaker, A.D., Jr., Butler, P.G., Cage, A., Richter, T., Husum, K., Hald, M., Andersson, C., Zorita, E., Linderholm, H.W., Gunnarson, B.E., Sicre, M.A., Sejrup, H.P., Jiang, H., and Wilson, R.J.S., (2013) Reconstructions of surface ocean conditions from the northeastern Atlantic and Nordic seas during the last millennium, The Holocene, 23(7), 921-935, doi:10.1177/0959683613479677.
Denniston, RF., Wyrwoll, K-H., Polyak, V., Brown, J.R., Asmerom, Y., Wanamaker, A.D., Jr., LaPointe, Z., Ellerbroek, R., Barthelmes, M., Cleary, D., Cugley, J., Woods, D., and Humphreys, W., (2013) A Stalagmite Record of Holocene Indonesian-Australian Summer Monsoon Variability from the Australian Tropics, Quaternary Science Reviews, 78, 155-168, doi: 10.1016/j.quascirev.2013.08.004.
Eagle, R.A., Eiler, J.M., Tripati, A.K., Ries, J.B., Freitas, P.S., Hiebenthal, C., Wanamaker, A.D., Jr., Taviani, M., Elliot, M., Marenssi, S., Nakamura, K., Ramirez, P., and Roy, K., (2013), The influence of temperature and seawater carbonate saturation state on 13C-18O bond ordering in bivalve mollusks, Biogeosciences, 10, 4591-4606, doi:10.5194/bgd-10-4591-2013.
#Henkes, G.A., Passey, B.H., Wanamaker, A.D., Jr., Grossman, E.L., Ambrose, W.G., Jr., and Carrol, M.L., (2013) Carbonate clumped isotope compositions of modern marine mollusk and brachiopod shells, Geochimica et Cosmochimica Acta, 106, 307-325, doi:10.1016/j.gca.2012.12.020.
#Liu, Y.W., Aciego, S.M., Wanamaker, A.D., Jr., and Sell, B.K., (2013), A high-throughput system for boron microsublimation and isotope analysis by total evaporation thermal ionization mass spectrometry, Rapid Communications in Mass Spectrometry, 27, 1705-1714, doi:10.1002/rcm.6619.
Reynolds, D.R., Butler, P.G., Williams, S.M., Richardson, C.A., Scourse, J.D., Wanamaker, A.D., Jr., Austin, W.E.N., Cage, A.G., and Sayer, M., (2013), A multiproxy reconstruction of Hebridean (NW Scotland) spring sea surface temperatures between AD 1805 and 2010, Palaeogeography, Palaeclimatology, Palaeoecology, 386, 275-285, doi:10.1016/j.palaeo.2013.05.029.
Reynolds, D.R., Richardson, C.A., Scourse, J.D., Butler, P.G., Wanamaker, A.D., Jr., Ridgway, I., Sayer, M., and Gulliver, P., (2013) The potential of the marine bivalve mollusc Glossus humanus (L.) as a sclerochronological archive, The Holocene, 23(12), 1711-1720.
*Beirne, E.C., Wanamaker, A.D., Jr., and Feindel, S., (2012) Experimental validation of environmental controls of δ13C of Arctica islandica (ocean quahog) shell carbonate, Geochimica et Cosmochimica Acta, 84, doi:10.1016/j.gca.2012.01.021.
Scourse, J.D., Wanamaker A.D. Jr., Weidman, C., Heinemeier, J., Reimer, P.J., Butler, P.G., Witbaard, R., and Richardson, C.A., (2012) The marine radiocarbon bomb-pulse across the temperate North Atlantic: a compilation of Δ14C time histories from Arctica islandica growth increments, Radiocarbon, 54(2).
Versteegh, E. A. A., Blicher, M. E., Mortensen, J., Rysgaard, S., Als, T. D. and Wanamaker, A.D., Jr., (2012), Oxygen isotope ratios in the shell of Mytilus edulis: archives of glacier meltwater in Greenland? Biogeosciences, 9, 5231-5241, doi:10.5194/bg-5239-5231-2012. OPEN ACCESS
Wanamaker, A.D., Jr., Butler, P.G., Scourse, J.D., Heinemeier, J., Eiríksson, J., Knudsen, K.L. and Richardson, C.A., (2012) Surface changes in the North Atlantic meridional overturning circulation during the last millennium. Nature Communications, 3: 899, doi:10.1038/ncomms1901. OPEN ACCESS
Butler, P. G., Wanamaker, A.D., Jr., Scourse, J.D., Richardson, C.A., and Reynolds, D.R., (2011) The stability of shell δ13C with respect to biological age in mature specimens of the long-lived bivalve Arctica islandica, Palaeogeography, Palaeclimatology, Palaeoecology, 302, doi:10.1016/j.palaeo.2010.03.038.
Halfar, J., Williams, B., Hetzinger, S., Steneck, R.S., Lebednik, P., Winsborough, C., Omar, A., and Wanamaker, A.D., Jr., (2011), 225 years of Bering Sea climate and ecosystem dynamics revealed by coralline algal growth-increment widths, Geology, 39, 579-582, doi:10.1130/G31996.1.
Schöne, B.R., Wanamaker, A.D., Jr., Fiebig, J., Thébault, J. and Kreutz, K.J., (2011) Annually resolved δ13Cshell chronologies of long-lived bivalve mollusks (Arctica islandica) reveal oceanic carbon dynamics in the temperate North Atlantic during recent centuries. Palaeogeography, Palaeclimatology, Palaeoecology, 302, doi:10.1016/j.palaeo.2010.02.002.
Wanamaker, A. D., Jr., S. Hetzinger, and J. Halfar (2011), Reconstructing mid- to high-latitude marine climate and ocean variability using bivalves, coralline algae, and marine sediment cores from the northern hemisphere, Palaeogeography, Palaeoclimatology, Palaeoecology, 302, doi: 10.1016/j.palaeo.2010.12.024.
Wanamaker, A. D., Jr., Kreutz, K.J., Schöne, B.R., and Introne, D.S., (2011) Gulf of Maine shells reveal changes in seawater temperature seasonality during the Medieval Climate Anomaly and the Little Ice Age, Palaeogeography, Palaeclimatology, Palaeoecology, 302, doi:10.1016/j.palaeo.2010.06.005.
Butler, P.G., Richardson, C.A., Scourse, J.D., Wanamaker, A.D., Jr., Shammon, T.M., and Bennell, J.D., (2010) Marine climate in the Irish Sea: analysis of a 489-year marine master chronology derived from growth increments in the shell of the clam Arctica islandica, Quaternary Science Reviews, 29, doi:10.1016/j.quascirev.2009.07.010.
Butler, P.G., Scourse, J.D., Richardson, C.A., Wanamaker, A.D., Jr., Bryant, C.L., and Bennell, J.D., (2009) Continuous marine radiocarbon reservoir calibration and the 13C Suess effect in the Irish Sea: results from the first absolutely dated multi-centennial shell-based marine master chronology, Earth and Planetary Science Letters, 279, doi:10.1016/j.epsl.2008.12.043.
Butler, P.G., Richardson, C.A., Scourse, J.D., Witbaard, R., Schöne, B.R., Fraser, N.M., Wanamaker, A.D., Jr., Bryant, C.L., Harris, I., and Robertson, I., (2009), Accurate increment identification and the spatial extent of the common signal in five Arctica islandica chronologies from the Fladen Ground, northern North Sea, Paleoceanography, 24, PA2210, doi:10.1029/2008PA001715.
Wanamaker, A.D., Jr., Baker, A., Butler, P.G., Richardson, C.A., Scourse, J.D., Ridgway, I., and Reynolds, D.J., (2009) A novel method for imaging internal growth patterns in marine mollusks: A fluorescence case study on the aragonitic shell of the marine bivalve Arctica islandica (Linnaeus), Limnology and Oceanography: Methods, 7, 673-681.
Wanamaker, A.D., Jr., Kreutz, K.J., Schöne, B.R., Maasch, K.A., Pershing, A.J., Borns, H.W., Jr., Introne, D.S., and Feindel, S., (2009), A Late Holocene paleo-productivity record in the Western Gulf of Maine, USA, inferred from growth histories of the long-lived ocean quahog (Arctica islandica), International Journal of Earth Sciences, Special Issue, Ocean’s role in climate change- a paleo perspective, 98, doi:10.1007/s00531-008-0318-z.
Halfar, J., Steneck, R.S., Joachimski, M., Kronz, A., and Wanamaker, A.D., Jr., (2008), Coralline red algae as high-resolution climate recorders, Geology, 36, doi:10.1130/G24635A.1.
Owen, E.F., Wanamaker, A.D., Jr., Feindel, S.C., Schöne, B.R., and Rawson, P.D., (2008), Stable carbon and oxygen isotope fractionation in bivalve (Placopecten magellanicus) larval aragonite, Geochimica et Cosmochimica Acta, 72, doi:10.1016/j.gca.2008.06.029.
Wanamaker, A.D., Jr., Heinemeier, J., Scourse, J.D., Richardson, C.A., Butler, P.G., Eiríksson, J., and Knudsen, K.L., (2008), Very-long lived molluscs confirm 17th century AD tephra-based radiocarbon reservoir ages for north Icelandic shelf waters, Radiocarbon, 50 (3).
Wanamaker, A.D., Jr., Kreutz, K.J., Wilson, T., Borns, H.W., Jr., Introne, D.S., and Feindel, S., (2008), Experimentally determined Mg/Ca and Sr/Ca ratios in juvenile bivalve calcite for Mytilus edulis: Implications for paleotemperature reconstructions, Geo-Marine Letters, Special Issue, Advances in mollusc sclerochronology and sclerochemistry: tools for understanding climate and environment, 28, doi:10.1007/s00367-008-0112-8.
Wanamaker, A.D., Jr., Kreutz, K.J., Schöne, B.R., Pettigrew, N.R., Borns, H.W., Jr., Introne, D.S., Belknap, D., Maasch, K.A., and Feindel, S., (2008), Coupled North Atlantic slope water forcing on Gulf of Maine temperatures over the past millennium, Climate Dynamics, 31, doi:10.1007/s00382-0070344-8.
Wanamaker, A.D., Jr., Kreutz, K.J., Borns, H.W., Jr., Introne, D.S., Feindel, S., Funder, S., Rawson, P.D., and Barber, B.J., (2007), Experimental determination of salinity, temperature, growth, and metabolic effects on shell isotope chemistry of Mytilus edulis collected from Maine and Greenland, Paleoceanography, 22, PA2217, doi:10.1029/2006PA001352.
Wanamaker, A. D., Jr., K. J. Kreutz, H. W. Borns, Jr., D. S. Introne, S. Feindel, and B. J. Barber, (2006), An aquaculture-based method for calibrated bivalve isotope paleothermometry, Geochemistry, Geophysics, Geosystems, 7, Q09011, doi:10.1029/2005GC001189.
Newsletters and Other Relevant Publications
Ridgway I, Richardson, C.A., Scourse, J.D., Wanamaker, A.D. Jr., and Butler, P.,(2008) The long-lived clam Arctica islandica, a new model species for ageing research, British Society for Research on Ageing, Newsletter, June 2008.
Wanamaker, A.D., Jr., Scourse, J.D., Richardson, C.A., Butler, P.G., Reynolds, D.J., and Ridgway, I, (2008), Absolute chronologies from the ocean: Records from the longest-lived, non-colonial animals on Earth, Past Global Changes (PAGES) News, Vol.16, No. 3, 4-6.