Together with collaborators in Europe (L. Diester-Haas, K. Emeis, L. Francois) I have been investigating changes in marine productivity over key intervals of the Neogene. We use multiple proxies (benthic foraminiferal accumulation rates and geochemical records) from a global array of sites together with numerical modeling to better understand the relationship between the carbon cycle and longer-term climate change. This research has been funded by grants from the Deutsche Forschungsgemeinschaft (to LDH) and resulted in the following publications:

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.

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.

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

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.

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, 2005.


Featured Faculty

Katharina Billups

Katharina Billups picture

Associate Director, Oceanography and Professor Oceanography


CEOE School & Departments

School of Marine Science & Policy

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

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Department of Geological Sciences

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

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Department of Geography

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

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College of Earth, Ocean, and Environment • 111 Robinson Hall • Newark, DE 19716 • USA • Phone: 302-831-2841
Geography: 302-831-2294 • Geology: 302-831-2569 • Marine Science and Policy: 302-645-4212 • E-mail:

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