Daniel P. Schrag

Daniel P. Schrag

Sturgis Hooper Professor of Geology; Professor of Environmental Science & Engineering; Director, Harvard University Center for the Environment; Co-Director, Science, Technology, and Public Policy Program
Daniel P. Schrag

Research Interests

Geochemical oceanography; stable isotope geochemistry; paleoclimatology; climate change; carbon sequestration; energy technology

Related Publications

Rinberg, A, Bergman, AM, Schrag, DP, and Aziz, MJ. Alkalinity concentration swing for direct air capture of carbon dioxide. ChemSusChem, 14, 1-16, 2021. View PDF

Hoffman, PF, Halverson, GP, Schrag, DP, Higgins, JA, Domack, EW, Macdonald, FA, Pruss, SB, Blattler, CL, Crockford, PW, Hodgin, EB,  Bellefroid, EJ, Johnson, BW, Hodgskiss, MSW, Lamothe, KG, LoBianco, SJC, Busch, JF, Howes, BJ, Greenman, JW, and Nelson, LL. Snowballs in Africa: Sectioning a long-lived Neoproterozoic carbonate platform and its bathyal foreslope (NW Namibia). Earth-Science Reviews, 219, 2021. 

Guilderson, TP, Schrag, DP, Druffel, ERM, and Reimer, RW. Postbomb subtropical North Pacific surface water radiocarbon history. JGR-Oceans, 126(2), 2021. View PDF

Kuntz, LB and Schrag, DP. Subtropical modulation of the equatorial undercurrent: A mechanism of Pacific variability. Climate Dynamics, 2021. View PDF

Liljestrand, FL, Laakso, TA, Macdonald, FA, Schrag, DP, and Johnston, DT. Isotopically anomalous organic carbon in the aftermath of the Marinoan snowball Earth. Geobiology, 18(4), 476-485, 2020. View PDF

Bold, U, Ahm, ASC, Schrag, DP, Higgins, JA, Jamsran, E, and Macdonald, FA. Effect of dolomitization on isotopic records from Neoproterozoic carbonates in southwestern Mongolia. Precambrian Research, 350, 2020.

Laakso, TA and Schrag, DP. The role of authigenic carbonate in Neoproterozoic carbon isotope excursions. Earth Planet. Sci. Lett. 549, 1-10, 2020. 

Kuntz, LB and Schrag, DP. Representation of the Equatorial Undercurrent in CMIP5 models. Journal of Physical Oceanography, 50(10), 2020. View PDF

Erhardt, AM, Turchyn, AV, Dickson, JAD, Sadekov, AY, Taylor, PD, Wilson, MA, and Schrag, DP. Chemical composition of carbonate hardground cements as reconstructive tools for phanerozoic pore fluids. Geochem. Geophys. Geosyst., 21, 2020. View PDF

Ford MJ and Schrag, DP. The case for a tortoise approach to U.S. nuclear research and development. Energy Policy, 135, 1-11, 2019.

Laakso, TA and Schrag, DP. Methane in the Precambrian atmosphere. Earth Planet. Sci. Lett. 522, 48-54, 2019.

Dagon, K and Schrag, DP. Quantifying the effects of solar geoengineering on vegetation. Climatic Change, 153(1-2), 235-251, 2019. View PDF

Laakso, TA and Schrag, DP. A small marine biosphere in the Proterozoic. Geobiology, (17)2, 161-171, 2019. View PDF

Ford, MJ and Schrag, DP. A tortoise approach for U.S. nuclear research and development. Nature Energy, (3)10, 810-812, 2018. View PDF

Laakso, TA and Schrag, DP. Limitations on limitation. Global Biogeochemical Cycles, (32)3, 486-496, 2018. View PDF

Kuntz, LB and Schrag, DP. Hemispheric asymmetry in the ventilated thermocline of the tropical Pacific. Journal of Climate, 31(3), 1281-1288, 2018. View PDF

Cumming, L, Gupta, N, Miller, K, Lombardi, C, Goldberg, D, ten Brink, U, Schrag, D, Andreasen, D, and Carter, K. Mid-Atlantic U.S. Offshore Carbon Storage Resource Assessment. Energy Procedia, 114, 4629-4636, 2017.

Dagon, K and Schrag, DP. Regional climate variability under model simulations of solar geoengineering. J. Geophys. Res.–Atmospheres, 122 (22), 12106-12121, 2017. View PDF

Ocko, IB, Hamburg, SP, Jacob, DJ, Keith, DW, Keohane, NO, Oppenheimer, M, Roy-Mayhew, JD, Schrag, DP, and Pacala, SW. Unmask temporal trade-offs in climate policy debates. Science, 356 (6337), 492-493. View PDF

Laakso, TA and Schrag, DP. A theory of atmospheric oxygen. Geobiology, 15 (3), 366-384, 2017. View PDF

Kuntz, LB and Schrag, DP. Impact of Asian aerosol forcing on tropical Pacific circulation and the relationship to global temperature trends. J. Geophys. Res.–Atmospheres, 121 (24), 14403-14413, 2016. View PDF

Hoffman, P, Bellefroid, EJ, Johnson, BW, Hodgskiss, MSW, Schrag, DP, and Halverson, GP. Early extensional detachments in a contractional orogen: coherent, map-scale, submarine slides (mass transport complexes) on the outer slope of an Ediacaran collisional foredeep, eastern Kaoko belt, Namibia. Canadian Journal of Earth Sciences, 53 (11), 1177-1189, 2016.

Smith, EF, Nelson, LL, Strange, MA, Eyster, AE, Rowland, SM, Schrag, DP, and Macdonald, FA. The end of the Ediacaran: Two new exceptionally preserved body fossil assemblages from Mount Dunfee, Nevada, USA. Geology, 44 (11), 911-914, 2016. View PDF

Lorrey, AM, Brookman, TH, Evans, MN, Fauchereau, NC, Macinnis-Ng, C, Barbour, MM, Criscitiello, A, Eischeid, G, Fowler, A, Horton, TW, and Schrag, DP. Stable oxygen isotope signatures of early season wood in New Zealand kauri (Agathis australis) tree rings: Prospects for palaeoclimate reconstruction. Dendrochronologia, 40, 1-14, 2016.

Clark, PU, Shakun, JD, Marcott, SA, Mix, AC, Eby, M, Kulp, S, Levermann, A, Milne, GA, Pfister, PL, Santer, BD, Schrag, DP, Solomon, S, Stocker, TF, Strauss, BH, Weaver, AJ, Winkelmann, R, Archer, D, Bard, E, Goldner, A, Lambeck, K, Pierrehumbert, RT, and Plattner, G. Consequences of twenty-first-century policy for multi-millennial climate and sea-level change. Nature Climate Change, 6(4), 360-369, 2016. View PDF

Dagon, K and Schrag, DP. Exploring the Effects of Solar Radiation Management on Water Cycling in a Coupled Land-Atmosphere Model. Journal of Climate, 29(7), 2635-2650, 2016. View PDF

Smith, EF, Macdonald, FA, Petach, TA, Bold, U, and Schrag, DP. Integrated stratigraphic, geochemical, and paleontological late Ediacaran to early Cambrian records from southwestern Mongolia. GSA Bulletin, 128(3-4), 442-468, 2016. View PDF

Bold, U, Smith, EF, Rooney, AD, Bowring, SA, Buchwaldt, R, Dudas, FO, Ramezani, J, Crowley, JL, Schrag, DP, and Macdonald, FA. Neoproterozoic stratigraphy of the Zavkhan Terrane of Mongolia: The backbone for Cryogenian and early Ediacaran chemostratigraphic records. Amer. Journal of Sci.,316(1), 1-63, 2016. View PDF

Petersen, SV and Schrag, DP. Antarctic ice growth before and after the Eocene-Oligocene transition: New estimates from clumped isotope paleothermometry. Paleoceanography, 30(10), 1305-1317, 2015.

Martindale, RC, Strauss, JV, Sperling, EA, Johnson, JE, Van Kranendonk, MJ, Flannery, D, French, K, Lepot, K, Mazumder, R, Rice, MS, Schrag, DP, Summons, R, Walter, M, Abelson, J, and Knoll, AH. Sedimentology, chemostratigraphy, and stromatolites of lower Paleoproterozoic carbonates, Turee Creek Group, Western Australia. Precambrian Research, 266, 194-211, 2015.

Kuntz, LB, Laakso, TA, Schrag, DP, and Crowe, SA. Modeling the carbon cycle in Lake Matano. Geobiology, 2015. View PDF

Smith, EF, Macdonald, FA, Crowley, JL, Hodgin, EB, and Schrag, DP. Tectonostratigraphic evolution of the c. 780–730 Ma Beck Spring Dolomite: Basin Formation in the core of Rodinia, in Supercontinent Cycles Through Earth History, edited by ZX Li, DAD Evans, Li, Z. X., Evans, and JB Murphy. Geological Society, London, Special Publications, UK, 424, 2015.

Gothmann, AM, Stolarski, J, Adkins, JF, Schoene, B, Dennis, KJ, Schrag, DP, Mazur, M, and Bender, ML. Fossil corals as an archive of secular variations in seawater chemistry since the Mesozoic. Geochim. Cosmochim. Acta, 160, 188-208, 2015.

Linsley, BK, Wu, HC, Dassié, EP, and Schrag, DP. Decadal changes in South Pacific sea surface temperatures and the relationship to the Pacific decadal oscillation and upper ocean heat content. Geophys. Res. Lett., 42, 2015. View PDF

Higgins, JA and Schrag, DP. The Mg isotopic composition of Cenozoic seawater—evidence for a link between Mg-clays, seawater Mg/Ca, and climate. Earth Planet. Sci. Lett., 416, 73-81, 2015.

Petersen, SV and Schrag, DP. Clumped isotope measurements of small carbonate samples using a high-efficiency dual-reservoir technique. Rapid Commun. Mass Spectrom., 28, 2371–2381, 2014. View PDF

Faculty Department

Earth & Planetary Sciences



Denise Sadler 617-495-3636

Contact Information

Museum of Comparative Zoology, Room 433F

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