Home   /   Our People   /   Profiles   /   kbillups   /   Publications



Lear, C. H., K. Billups, R. E.M. Rickaby, L. Diester-Haass, E. M. Mawbey, and S. M. Sosdian, Breathing more deeply: Deep ocean carbon storage during the mid-Pleistocene climate transition, Geology, doi:10.1130/G38636.1, 2016.

Billups, K., H. Kunz, I. Rew, and C. Hudson,  Exploring Globorotalia truncatulinoides coiling ratios as a proxy for subtropical gyre dynamics in the northwestern Atlantic Ocean during late Pleistocene Ice Ages, Paleoceanography, 31, doi:10.1002/2016PA002927, 2016.


Billups, K., Timing is everything during deglaciations, Nature News and Views, 522, 163-164, 2015.


Poirier, R. K., and K. Billups, The intensification of northern component deep water formation during the mid-Pleistocene climate transition, Paleoceanography, 10.1002/201/2014PA0026661, 2014.

Eichler, P., K. Billups, H. Vital, Tracing thermohaline properties and productivity of shelf water masses with the stable isotopic composition of benthic foraminifera, Journal of Foraminiferal Research, 44, 352-364, 2014.

Billups, K., A. Scheinwald, Origin of millennial-scale climate signals in the subtropical North Atlantic, Paleoceanography, 29, 612-627, 2014.


Venti, N., K. Billups, and T. Herbert, Increased sensitivity of the Plio/Pleistocene northwest Pacific to obliquity forcing, EPSL, 384, 121-131, DOI: 10.10.1016/j.epsl.2013.10.007, 2013.

Diester-Haass, L., Billups, K., Jacquemin, I., Emeis, K. C., Lefebvre, V., and François, L., Paleoproductivity during the middle Miocene carbon isotope events: A data- model approach, Paleoceanography, 28, 334-346, 2013.

Venti N. and K. Billups, Surface Water Hydrography of the Kuroshio Extension during the Plio/Pleistocene climate transition, Marine Micropaleontology, 101, 106-114. Featured article in SedDB: http://www.earthchem.org/seddb


Billups, K., Aufdenkampe, A., R. Hays, Late Miocene through early Pleistocene nutrient utilization and export production in the Antarctic Zone of the Southern Ocean, Global and Planetary Change, http://dx.doi.org/10.1016/j.gloplacha.2012.11.014.

Kaufman, D., K. Cooper, R. Behl, K. Billups, J. Bright, K. Gardner, P. Hearty, M. Jakobsson, I. Mendes, M. O‘Leary, L.Polyak, T. Rasmussen, F. Rosa, M. Schmidt, Amino acid racemization in mono-specific foraminifera from Quaternary in 2 deep-sea sediments, Quaternary Geochronology, http://dx.doi.org/10.1016/j.quageo.2012.07.006.

Venti, N. L., and Billups K. Stable-isotope stratigraphy of the Pliocene-Pleistocene climate transition in the northwestern subtropical Pacific, Palaeoecology, Palaeogeography, Palaeoclimatology, doi: 10.1016/j.palaeo.2012.02.001.


Billups, K., N. Rabideaux, and J. Stoffel, Suborbital-Scale Surface and Deep Water Records in the Subtropical North Atlantic: Implications on Thermohaline Overturn, Quaternary Science Reviews, 30, 2976-2987, 2011.

Diester-Haass, L., K. Billups, and K. C. Emeis. Marine biological productivity and carbon cycling during the Oligocene to Miocene climate transition, Palaeoecology, Palaeogeography, Palaeoclimatology, 302, 464-473, 2011.


Voelker, A. H. L. , T. Rodrigues. R. Stein, J. Hefter, K. Billups, D. Oppo, J. McManus, and J. O. Grimalt. Variations in mid-latitude North Atlantic surface water properties during the mid-Brunhes (MIS 9–14) and their implications for the thermohaline circulation, Climate of the Past, 6, 531-552, 2010.

Eichler, P., K. Billups, and C. C. Velez Cardona, Tracing salinity with the stable isotopic composition of foraminiferal tests in and Atlantic coastal lagoon, Delaware, USA, Journal of Foraminiferal Research, 40, 14-33, 2010.


Billups, K., and K. Scheiderich, A synthesis of Late Oligocene through Miocene deep sea temperatures as inferred from foraminiferal Mg/Ca ratios, Int. Assoc. Sedimentol Spec. Publ. 42, 1-16, 2009.

Diester-Haass, L., K. Billups, D. R. Gröcke, L. François, V. Lefebvre, and K. C. Emeis (2009), Mid-Miocene paleoproductivity in the Atlantic Ocean and implications for the global carbon cycle, Paleoceanography, 24, PA1209, doi:10.1029/2008PA001605.


Weirauch, D., Billups, K. and P. Martin, Evolution of Millennial-Scale Climate Variability During the Mid Pleistocene, Paleoceanography, 23, PA3216, doi:10.1029/2007PA001584.

Billups, K., Kelly, C., Pierce, E., The Late Miocene to Early Pliocene Climate Transition in the Southern Ocean, Palaeoecology, Palaeogeography, Palaeoclimatology, 267, 31-40, 2008.

Lazarus, D., Bittniok, B., Diester-Haass, L., Billups, K., Ogaway, Y., Takahashi, K., Meyers, P., Radiolarian and sedimentologic paleoproductivity proxies in late Pleistocene sediments of the Benguela Upwelling System, ODP Site 1084, Marine Micropaleontology, 68, 223-235, 2008.

Waite, A., L. Diester-Haass, S. Gibbs, R. Rickaby, and K. Billups, A Top-down and Bottom-up Comparison of paleoproductivity proxies: Calcareous Nannofossil Sr/Ca Ratios and Benthic Foraminiferal Accumulation Rates, G-Cubed, 9, doi: 10/1029/2007GC001812, 2008 2008.


Ravelo, A.C., K. Billups, PS. Dekens, T.D. Herbert, and K.T. Lawrence. Onto the Ice Ages: Proxy Evidence for the onset of Northern Hemisphere Glaciation, in Deep-time perspectives on climate change: marrying the signal from computer models and biological proxies, M. Williams, A. M. Haywood, J. Gregory and D. Schmidt (eds), The Geological Society of London & The Micropalaeontological Society, (2007).


Diester-Haass, L., K. Billups, and K. C. Emeis, The late Miocene carbon isotope shift and marine biological productivity in the Indo-Pacific Ocean (ODP Sites 721, 1172, 1146, and 846): a (dusty) link? Paleoceanography, 21, doi.:10.1029/2006PA001267, 2006.

Billups, K., C. Lindley, J. Fisler, and P. Martin, Mid Pleistocene climate instability in the subtropical northwestern Atlantic, Global Planetary Change, 54, 251-262, 2006.

Lazarus, D., Bittniock, B., Meyers, P., Diester-Haass, L., and K. Billups, Comparison of radiolarian and sedimentologic Paleoproductivity proxies in the latest Miocene-Recent Benguela Upwelling System, Marine Micropaleontology, 60, 269-294, 2006.


Diester-Haass, L., K. Billups, and K. C. Emeis, In search of the late Miocene-early Pliocene „Biogenic Bloom“ in the Atlantic Ocean, (ODP Sites 982, 925, 1088) Paleoceanography, 20, 10.1029/2005PA001139.

Niemitz, M. D., and K. Billups, Millennial-scale variability in western tropical Atlantic surface ocean hydrography during the early Pliocene, Marine Micropaleontol., 54, 155-166, 2005.


Billups, K., R. Rickaby, and D. P. Schrag, Cenozoic pelagic Sr/Ca records: Exploring a link to paleoproductivity, Paleoceanography, 19, doi.:10.1029/2004PA001011, 2004.

Billups, K., W. Chaisson, M. Worsnopp, and R. Thunell, Millennial-Scale Fluctuations in Subtropical Northwestern Atlantic Surface Ocean Thermal Stratification, Paleoceanography, 19, doi: 10.1029/2003PA000990, 2004.

Billups, K., H. Paelike, J. Channell, J. Zachos, N. Shackleton, Astronomic Calibration of the Late Oligocene Through Early Miocene Geomagnetic Polarity Time Scale, EPSL, 224, 33-44, 2004.

Rosenthal, Y., S. Perron-Cashman, C. H. Lear, E. Baard, S. Barker, K. Billups, M. Bryan, M. L. Delaney, P. B. deMenocal, G. S. Dwyer, H. Elderfield, C. R. German, M. Greaves, D. W. Lea, T. M. Machiotto, D. K. Pak, A. C. Ravelo, G. L. Paradis, A. D. Russell, R. R. Schneider, K. Scheiderich, L. Stott, K. Tachikawa, E. Tapa, R. Thunell, M. Wara, S. Weldeab, P. A. Wilson, Inter-laboratory comparison study of Mg/Ca and Sr/Ca, measurements in planktonic foraminifera for paleoceanographic research, Geochemistry, Geophysics, Geosystems, 5 (4), 10.1029/2003GC000650, 2004.


Billups, K., and D. P. Schrag, Application of benthic foraminiferal Mg/Ca ratios to questions of early Cenozoic climate change, Earth and Planetary Science Letters, 209, 181-195, 2003.

Channell, J.E.T., S. Galeotti, E.E. Martin, K. Billups, H. Scher, and J.S. Stoner, Eocene to Miocene magnetic, bio- and chemostratigraphy at ODP Site 1090 (subantarctic South Atlantic), Geological Society of America Bulletin, 115, 607-623, 2003.


Billups, K., Late Miocene through early Pliocene deep water circulation and climate change viewed from the subantarctic Southern Ocean, Palaeoecology, Palaeogeography, Palaeoclimatology, 185, 287-307, 2002.

Billups, K., J. Channell, and J. Zachos, Late Oligocene to Early Miocene Geochronology and Paleoceanography From the Subantarctic South Atlantic, Paleoceanography, 17 (1), 10.1029/2000PA000568, 2002.

Billups, K., and D. P. Schrag, Paleotemperatures and Ice-Volume of the Past 27 myr Revisited with Paired Mg/Ca and Stable Isotope Measurements on Benthic Foraminifera, Paleoceanography, 17 (1), 10.1029/2000PA000567, 2002.


Zachos, J., M. Pagani, L. Sloan, E. Thomas, and K. Billups, Trends, rhythms, and aberrations in global climate 65 Ma to present, Science, 292, 686-693, 2001.


Billups, K., and D. P. Schrag, 2000, Surface Ocean Density Gradients during the Last Glacial Maximum, Paleoceanography, 15, 110-123.


Billups, K., A. C. Ravelo and J. C. Zachos, and D. Norris, 1999, Link between oceanic heat transport, thermohaline circulation and the Intertropical Convergence Zone in the early Pliocene Atlantic, Geology, 27, 319-322.


Billups, K., A. C. Ravelo and J. C. Zachos, 1998b, Early Pliocene Climate: A Perspective From the Western Equatorial Atlantic Warm Pool, Paleoceanography, 13, 459-470.

Billups, K., A. C. Ravelo and J. C. Zachos, 1998a, Early Pliocene Deep Water Circulation in the Western Equatorial Atlantic: Implications for High Latitude Climate Change, Paleoceanography, 13, 84-95.


Billups, K., A. C. Ravelo and J. C. Zachos, 1997, Early Pliocene Deep-Water Circulation: Stable Isotope Evidence for Enhanced Northern Component Deep-Water Formation. Proc. ODP, Sci. Results, 154, 319-330.


Billups K. and H. J. Spero, 1996, Reconstructing the Stable Isotope Geochemistry and Paleotemperatures of the Equatorial Atlantic During the Last 150,000 years: Results from Individual Foraminifera. Paleoceanography, 11, 217-238.


Billups K. and H. J. Spero, 1995, Relationship Between Shell Size, Thickness and Stable Isotopes in Individual Planktonic Foraminifera from Two Equatorial Atlantic Cores. Journal of Foraminiferal Research, 25 (1): 24-37.


Hofmeister, A. M. and K. Billups, 1991, Comparison of Infrared Reflectance Spectra of KXF3 Perovskites. Spectrochimica Acta 47a, 1607-1617


CEOE School & Departments

School of Marine Science & Policy

Advancing the understanding, stewardship, and conservation of estuarine, coastal, and ocean environments.

Learn More
Department of Geological Sciences

Discovering how geological processes have operated over various time scales to create and influence the planet’s surface environments.

Learn More
Department of Geography

Investigating the interactions between people and the environment and the processes that explain the location of human and natural phenomena.

Learn More

College of Earth, Ocean, and Environment • 111 Robinson Hall • Newark, DE 19716 • USA
Phone: 302-831-2841 • E-mail: ceoe-info@udel.edu

Back to Top