GEOMAR  Diemer Kochhann, Karlos Guilherme

Dr. Karlos G. D. Kochhann

Profile picture

FB 1: Ozeanzirkulation und Klimadynamik
FE Paläo-Ozeanographie
 

Office:
Phone: +49 431 600 1570

Email: kkochhann(at)geomar.de

Address:
Wischhofstraße 1-3
24148 Kiel

Research interests

My research is focused on paleoceanographic and paleoclimatic reconstructions based on Cenozoic and Mesozoic sedimentary archives. I use geochemical and micropaleontological tools to reconstruct past climate variability and carbon cycle perturbations, mostly for warm phases such as the Miocene Climatic Optimum (MCO) and the Aptian-Albian transition. More recently, I have started to explore Earth System models and continental sedimentary archives to reconstruct carbon fluxes during the MCO.

Academic experience

  • Postdoctoral researcher at GEOMAR Helmholtz Centre for Ocean Research Kiel; 2022 to present;

  • Fulbright Visiting Scholar at University of California Riverside; 2022 to 2023;

  • Assistant Professor in the Geology Graduate Program at Universidade do Vale do Rio dos Sinos (UNISINOS University), Brazil; Geology undergraduate courses; 2018 to 2025;

  • Research assistant at Christian-Albrechts-University of Kiel, Germany; 2017;

  • Doctorate in Natural Sciences – Christian-Albrechts-University of Kiel, Germany; 2014 to 2017;

  • Masters in Geology (Focus: Sedimentary Geology) - Universidade do Vale do Rio dos Sinos (UNISINOS University), Brazil; 2011 to 2012;

  • Research assistant at Universidade do Vale do Rio dos Sinos (UNISINOS University), Brazil; 2010 to 2014;

  • Bachelor in Geology – Universidade do Vale do Rio dos Sinos (UNISINOS University), Brazil; 2006 to 2010.

Grants

  • Call to support early-stage scientists by the Serrapilheira Institute (Brazil) and Fundação de Amparo à Pesquisa do Rio Grande do Sul (FAPERGS, Brazil), 2023;

  • Research Productivity Grant by the National Council for Scientific and Technological Development (CNPq, Brazil), 2023;

  • Universal Grant by the National Council for Scientific and Technological Development (CNPq, Brazil), 2023;

  • Junior Visiting Scholar Award by Fulbright (US), 2022;

  • Grant for Early Carrier Doctors by Fundação de Amparo à Pesquisa do Rio Grande do Sul (FAPERGS), 2021;

  • Universal Grant by the National Council for Scientific and Technological Development (CNPq, Brazil), 2018;

  • PhD scholarship by the National Council for Scientific and Technological Development (CNPq, Brazil) and the German Academic Exchange Service (DAAD, Germany), 2013/2014.

Selected publications

Complete lists of publications can be found at https://orcid.org/0000-0001-5339-1103 and at https://scholar.google.com/citations?user=_C42IepFNf0C.

 

  1. Zardin, T.N., Kochhann, K.G.D., Bolton, C.T., Bom, M.H.H., Krahl, G., Guerra, R.M., Fauth, G., 2026. The Late Miocene-Early Pliocene biogenic bloom in oligotrophic waters of the South Atlantic Subtropical Gyre. Palaeogeography, Palaeoclimatology, Palaeoecology, 690, 113718, DOI: 10.1016/j.palaeo.2026.113718.

  2. Duarte, L.R.C., Kochhann, K.G.D., Trentin, F.A., Kochhann, M.V.L., Leandro, L.M., Oliveira, R.G., D´Apolito, C., Villegas-Martín, J., 2025. Orbitally paced hydroclimate changes in western Amazonia wetlands during the Middle Miocene. Geophysical Research Letters, 52, e2025GL117517, DOI: 10.1029/2025GL117517.

  3. Trentin, F.A., Cagliari, J., Frank, T., Kochhann, K.G.D., Hren, M.T, Fielding, C.R., Wang, Z., Tedesco, J., Aquino, C.D., Lopes, W., 2025. The Late Paleozoic ice age termination in Southwestern Gondwana: New evidence from the Paraná Basin. Gondwana Research, 147, 192-212, DOI: 10.1016/j.gr.2025.06.017.

  4. Trentin, F.A., Cagliari, J., Kochhann, K.G.D., Frank, T., 2025. Chemical weathering proxies: An assessment of their robustness to reconstruct Paleozoic climate conditions. Evolving Earth, 3, 100054, DOI: 10.1016/j.eve.2024.100054.

  5. Burkett, A.M., Huber, B.T., Young, J.R., Katz, M.E., Borrelli, C., Fung, M.K., de Mello, R.M., Kochhann, K.G.D., Dameron, S.N., Thomas, E., Alegret, L., 2024. BFORAMS@MIKROTAX: An online database for deep-sea benthic foraminiferal taxonomy. Journal of Foraminiferal Research, 54, 394-403, DOI: 10.61551/gsjfr.54.4.394.

  6. Kochhann, K.G.D., Huber, B.T., Holbourn, A.E., Kuhnt, W., 2023. Benthic Foraminiferal Response to the Aptian−Albian Carbon Cycle Perturbation in the Atlantic Ocean. Journal of Foraminiferal Research, 53, 214-225, DOI: 10.2113/gsjfr.53.3.214.

  7. Krahl, G., Arenillas, I., Gilabert, V., Kochhann, K.G.D., Bom, M.H.H., Fauth, G., ARZ, J.A., 2023. Impact of early Danian environmental perturbations on mid-latitude planktic foraminiferal assemblages from the ODP Site 1262 (South Atlantic Ocean). Newsletters on Stratigraphy, 56, 377-403, DOI: 10.1127/nos/2023/0744.

  8. Martins, A.K., Kochhann, K.G.D., Chiessi, C.M., Bauersachs, T., Zardin, T.N., Campos, M.C., Krahl, G., de Souza, L.V., Crivellari, S., Bahr, A., Kuhnert, H., Schwark, L., Fauth, G., 2023. Links between precipitation patterns over eastern tropical South America and productivity in the western tropical South Atlantic Ocean during the last deglacial. Quaternary International, 667, 29-40, DOI: 10.1016/j.quaint.2023.05.012.

  9. Bom, M.H.H., Kochhann, K.G.D., Heimhofer, U., Mota, M.A.L. , Guerra, R.M., Simões, M.G., Krahl, G., Meirelles, V., Ceolin, D., Fürsich, F., Lima, F.H.O., Fauth, G., Assine, M.L., 2023. Fossil-Bearing Concretions of the Araripe Basin Accumulated During Oceanic Anoxic Event 1b. Paleoceanography and Paleoclimatology, 38, e2023PA004736, DOI: 10.1029/2023PA004736.

  10. Fauth, G., Krahl, G., Kochhann, K.G.D., Bom, M.H.H., Baecker-Fauth, S., Bruno, M.D.R., Guerra, R.M., Ceolin, D., da Silva dos Santos, A., Villegas-Martin, J., Strohschoen Jr., O., Savian, J.F., Leandro, C.G., de Mello, R.G., de Oliveira Lima, F.H., 2022. Astronomical calibration of the latest Aptian to middle Albian in the South Atlantic Ocean. Palaeogeography Palaeoclimatology Palaeoecology 602, 111175, DOI: 10.1016/j.palaeo.2022.111175.

  11. Holbourn, A.E., Kuhnt, W., Kochhann, K.G.D., Matsuzaki, K.M., Andersen, N., 2022. Middle Miocene climate-carbon cycle dynamics: Keys for understanding future trends on a warmer Earth?. In: Aiello, I., Barron, J., and Ravelo, C. (Eds.). Understanding the Monterey Formation and Similar Biosiliceous Units across Space and Time. 1ed.: Geological Society of America Special Paper, v. 556, p. 1-20, DOI: 10.1130/2022.2556(05).

  12. Bom, M.H.H., Ceolin, D., Kochhann, K.G.D., Krahl, G., Fauth, G., Bergue, C.T., Savian, J.F., Strohschoen Junior, O., Simões, M.G., Assine, M.L., 2021. Paleoenvironmental evolution of the Aptian Romualdo Formation, Araripe Basin, Northeastern Brazil. Global and Planetary Change 203, 103528, DOI: 10.1016/j.gloplacha.2021.103528.

  13. Bretschneider, L., Hathorne, E.C., Huang, H., Lübbers, J., Kochhann, K.G.D., Holbourn, A.E., Kuhnt, W., Thiede, R., Gebregiorgis, D., Giosan, L., Frank, M., 2021. Provenance and weathering of clays delivered to the Bay of Bengal during the middle Miocene: Linkages to tectonics and monsoonal climate. Paleoceanography and Paleoclimatology 36, e2020PA003917, DOI: 10.1029/2020PA003917.

  14. Kochhann, K.G.D., Kuhnt, W., Holbourn, A.E, Usui, Y., Lübbers, J., Beil, S., Andersen, N., 2021. Impacts of the Middle Miocene Climatic Transition on deep-water carbonate preservation and oxygenation in the equatorial Indian Ocean. Palaeogeography, Palaeoclimatology, Palaeoecology 576, 110511, DOI: 10.1016/j.palaeo.2021.110511.

  15. Kochhann, M.V.L., Cagliari, J., Kochhann, K.G.D., Franco, D.R., 2020. Orbital and millennial‐scale cycles paced climate variability during the Late Paleozoic Ice Age in the southwestern Gondwana. Geochemistry, Geophysics, Geosystems 21, e2019GC008676, DOI: 10.1029/2019GC008676

  16. Lübbers, J., Kuhnt, W., Holbourn, A.E., Bolton, C.T., Gray, E., Usui, Y., Kochhann, K.G.D., Beil, S., Andersen, N., 2019. The middle to late Miocene “carbonate crash” in the equatorial Indian Ocean. Paleoceanography and Paleoclimatology 34, 813-832, DOI: 10.1029/2018PA003482.

  17. Holbourn, A., Kuhnt, W., Clemens, S.C., Kochhann, K.G.D., Jöhnck, J., Lübbers, J., Andersen, N., 2018. Late Miocene climate cooling and intensification of southeast Asian winter monsoon. Nature Communications 9, 1584, DOI: 10.1038/s41467-018-03950-1.

  18. Zhang, P., Xu, J., Schröder, J.F., Holbourn, A., Kuhnt, W., Kochhann, K.G.D., Ke, F., Wang, Z., Wu, H., 2018. Variability of the Indonesian Throughflow thermal profile over the last 25-kyr: A perspective from the southern Makassar Strait. Global and Planetary Change 169, 214-223, DOI: 10.1016/j.gloplacha.2018.08.003.

  19. Kochhann, K.G.D., Holbourn, A., Kuhnt, W., Xu, J., 2017. Eastern equatorial Pacific benthic foraminiferal distribution and deep water temperature changes during the early to middle Miocene. Marine Micropaleontology133, 28-39, DOI: 10.1016/j.marmicro.2017.05.002.

  20. Kochhann, K.G.D., Holbourn, A., Kuhnt, W., Channell, J.E.T., Lyle, M., Shackford, J.K., Wilkens, R.H., Andersen, N., 2016. Eccentricity pacing of eastern equatorial Pacific carbonate dissolution cycles during the Miocene Climatic Optimum. Paleoceanography 31, 1176-1192, DOI: 10.1002/2016PA002988.

  21. Holbourn, A., Kuhnt, W., Kochhann, K.G.D., Andersen, N., Meier, K.J.S., 2015. Global perturbation of the carbon cycle at the onset of the Miocene climatic optimum. Geology 43(2), 123-126, DOI:10.1130/G36317.1.

  22. Kochhann, K.G.D., Koutsoukos, E.A.M., Fauth, G., Sial, A.N., 2013. Aptian-Albian planktic foraminifera from DSDP Site 364 (offshore Angola): Biostratigraphy, paleoecology and paleoceanographic significance. Journal of Foraminiferal Research 43, 443-463, DOI: 10.2113/gsjfr.43.4.443.