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.