Dr. Baerbel Hoenisch

Professor of Earth and Environmental Sciences, Geochemistry, Lamont-Doherty Earth Observatory (LDEO), Columbia Climate School

Comer 229
61 Route 9W
Lamont-Doherty Earth Observatory
Palisades, NY 10964
United States


Bärbel Hönisch is a Professor of Earth and Environmental Sciences, and specializes in Paleoceanography. Her primary research interests are the linkages between atmospheric carbon dioxide and climate in the past, including the validation and application of paleoproxies in marine archives.


Bärbel Hönisch reconstructs past Earth environments over geological time using a number of tell-tale signatures in the geological record. Here she explains how past environmental information can be teased from ocean sediments.


Only select projects listed below
Name Start Date End Date
Boron Isotope Analyses in Benthic Foraminifera Shells 9/1/18 8/31/19
Boron Isotope Measurements on Arctic Ocean Foraminifera 10/1/13 9/30/14
Collaborative Research: An Eocene Perspective on Future Recovery Rates of Climate 3/1/17 2/29/20
Collaborative Research: Taking the Reliability of Cenozoic Boron Isotope pH and pCO2 reconstructions to the next level 4/1/17 3/31/21
Ocean Acidification - Category 1: Calibration and Application of the Boron Isotope Seawater-pH Indicator in Deep-water Corals 9/15/10 8/31/16
Ocean Acidification: Collaborative Research: Establishing the Magnitude of Sea-Surface Acidification During The Paleocene-Eocene Thermal Maximum 9/1/12 8/31/16
PaleopCO2 - A Scientifically Rigorous and Accessible CO2 Keeling Curve For Geologic Time 1/1/19 12/31/21
PaleopH reconstruction across the Middle Eocene Climatic Optimum (MECO) using boron isotopes (d11B) 4/1/15 3/31/16
RCN: Improving reconstructions of Cenozoic pCO2 and temperature change 10/1/16 9/30/20
Reconstructing the role of CO2 in climate change throughout the Cenozoic Step 1: The mid-Pleistocene transition 9/1/06 8/30/10
Testing geochemical proxy relationships under variable paleo-seawater chemical compositions 9/1/12 8/31/17
Thermohaline Circulation and Deep Ocean Carbonate Chemistry across the Mid-Pieistocene Transition 9/1/14 8/31/17
Validation of the B/Ca Proxy for Surface Seawater pH and Application to Measure Anthropogenic Ocean Acidification 3/15/08 2/28/14
Workshop on Paleo-Ocean Acidification and Carbon Cycle Perturbation Events August 26-28, 2010 6/1/10 5/31/13
Reconstructing ocean carbon storage changes from the Eocene to the Oligocene, 38-28 Ma" 1/1/21 12/31/22
Collaborative Proposal: CO2PIP — A Community Project to Advance and Standardize Approaches to Paleo-CO2 Reconstruction and Build the Next-Generation Phanerozoic Record 8/1/21 7/31/24
Experimental Refinement of the Boron Isotope Proxy in Planktic Foraminifera – Temperature,Asymbiotic Sensitivity, and Seawater Elemental Composition 8/15/21 7/31/24
Interglacials of the 41 kyr-world and the Middle Pleistocence Transition 7/1/22 7/1/23
Lamont Doherty Core Repository: Curation, Service Professional Development, Outreach 6/15/16 5/31/21


Only select publications listed below
Name Published Date
Episodic release of CO2 from the high-latitude North Atlantic Ocean during the last 135 kyr 2017
Single laboratory comparison of MC-ICP-MS and N-TIMS boron isotope analyses in marine carbonates 2016
Effects of seawater-pH and biomineralization on the boron isotopic composition of deep-sea bamboo corals 2015
Timing and mechanism for intratest Mg/Ca variability in a living planktic foraminifer 2015
Rapid and sustained surface ocean acidification during the Paleocene-Eocene Thermal Maximum 2014
Boron, carbon, and oxygen isotopic composition of brachiopod shells: Intra-shell variability, controls, and potential as a paleo-pH recorder 2013
Interlaboratory Comparison of Boron Isotope Analyses of Boric Acid, Seawater and Marine CaCO3 by MC-ICPMS and NTIMS 2013
Micron-scale intrashell oxygen isotope variation in cultured planktic foraminifers 2013
The Influence of Salinity on Mg/Ca in Planktic Foraminifers – Evidence from Cultures, Core-top Sediments and Complementary δ18O 2013
Making sense of palaeoclimate sensitivity 2012
The Geological Record of Ocean Acidification 2012
The Geological Record of Ocean Acidification: Carbonate Chemistry Tutorial 2012
The Geological Record of Ocean Acidification: Supporting Online Material 2012
The Geological Record of Ocean Acidification: Tables 2012
The planktic foraminiferal B/Ca proxy for seawater carbonate chemistry: A critical evaluation 2012
Atmospheric CO2 decline during the Pliocene intensification of Northern Hemisphere glaciations 2011
Controls on boron incorporation in cultured tests of the planktic foraminifer Orbulina universa 2011
Planktic foraminifers as recorders of seawater Ba/Ca 2011


*indicates my students, § my postdocs

*Anderson, L.B., B. Hönisch, H. Coxall, 'Atmospheric CO2 estimates for the late Oligocene and early Miocene using multi-species cross-calibrations of boron isotopes', Paleoceanography and Paleoclimatology, accepted

The Cenozoic CO2 Proxy Integration Project (CenCO2PIP) Consortium (Bärbel Hönisch, Dana L. Royer, Daniel O. Breecker, Pratigya J. Polissar, Gabriel J. Bowen, Michael J. Henehan, Ying Cui, Margret Steinthorsdottir, Jennifer C. McElwain, Matthew J. Kohn, Ann Pearson, Samuel R. Phelps, Kevin T. Uno, Andy Ridgwell, Eleni Anagnostou, Jacqueline Austermann, Marcus P. S. Badger, Richard S. Barclay, Peter K. Bijl, Thomas B. Chalk, Christopher R. Scotese, Elwyn de la Vega, Robert M. DeConto, Kelsey A. Dyez, Vicki Ferrini, Peter J. Franks, Claudia F. Giulivi, Marcus Gutjahr, Dustin T. Harper, Laura L. Haynes, Matthew Huber, Kathryn E. Snell, Benjamin A. Keisling, Wilfried Konrad, Tim K. Lowenstein, Alberto Malinverno, Maxence Guillermic, Luz María Mejía, Joseph N. Milligan, John J. Morton, Lee Nordt, Ross Whiteford, Anita Roth-Nebelsick, Jeremy K. C. Rugenstein, Morgan F. Schaller, Nathan D. Sheldon, Sindia Sosdian, Elise B. Wilkes, Caitlyn R. Witkowski, Yi Ge Zhang, Lloyd Anderson, David J. Beerling, Clara Bolton, Thure E. Cerling, Jennifer M. Cotton, Jiawei Da, Douglas D. Ekart, Gavin L. Foster, David R. Greenwood, Ethan G. Hyland, Elliot A. Jagniecki, John P. Jasper, Jennifer B. Kowalczyk, Lutz Kunzmann, Wolfram M. Kürschner, Charles E. Lawrence, Caroline H. Lear, Miguel A. Martínez-Botí, Daniel P. Maxbauer, Paolo Montagna, B. David A. Naafs, James W. B. Rae, Markus Raitzsch, Gregory J. Retallack, Simon J. Ring, Osamu Seki, Julio Sepúlveda, Ashish Sinha, Tekie F. Tesfamichael, Aradhna Tripati, Johan van der Burgh, Jimin Yu, James C. Zachos, Laiming Zhang): "Towards a Cenozoic History of Atmospheric CO2", Science 382, eadi5177, doi: 10.1126/science.adi5177 (2023). Reprint link: https://www.science.org/stoken/author-tokens/ST-1598/full

*Haynes, L., B. Hönisch, K. Holland, S.M. Eggins, Y. Rosenthal, “Calibrating Planktic Foraminiferal Mg/Ca for Application Across the Cenozoic", Paleoceanography and Paleoclimatology 38, e2023PA004613.

Xiong, Z., T. Li, B. Hönisch, T.J. Algeo, L. Bradtmiller, M. Cane, C. Laj, F. Wang, Z. Lu, B. Qin, F. Chang, X. Gong, "Monsoon- and ENSO-driven surface-water pCO2 variation in the tropical West Pacific since the Last Glacial Maximum'. Quaternary Science Reviews 289, 107621.

Boer, W., S. Nordstad, M. Weber, R. Mertz-Kraus, B. Hönisch, J. Bijma, M. Raitzsch, D. Wilhelms-Dick, G. L. Foster, H. Goring-Harford, D. Nürnberg, F. Hauff, H. Kuhnert, F. Lugli, H. Spero, M. Rosner, P. van Gaever, L. J. de Nooijer, G.-J. Reichart, “A new calcium carbonate nano-particulate pressed powder pellet NFHS-2-NP for LA-ICP-OES, LA-(MC)-ICP-MS and µXRF”. Geostandards and Geoanalytical Research, doi: 10.1111/ggr.12425.

Henehan, M.J., Klein Gebbinck, C.D., Wyman, J.V.B., Hain, M.P., James W.B, R., Hönisch, B., Foster, G.L. and Kim, S.-T. (2022) No ion is an island: Multiple ions influence boron incorporation into CaCO3. Geochimica et Cosmochimica Acta 318, 510-530.

Hönisch, B., Fish, C.R., Phelps, S.R., Haynes, L.L., Dyez, K., Holland, K., Fehrenbacher, J., Allen, K.A., Eggins, S.M. and Goes, J.I. (2021) Symbiont Photosynthesis and Its Effect on Boron Proxies in Planktic Foraminifera. Paleoceanography and Paleoclimatology 36, e2020PA004022.

Zhou, X., Y. Rosenthal, *L. Haynes, S. Woodard, K.A. Allen, W. Si, D. Evans, S. Sosdian, C.H. Lear, B. Hönisch, and J. Erez, "Foraminiferal Na/Ca ratios: a new proxy of secular variations in seawater calcium concentration", Geochimica et Cosmochimica Acta 305, p. 306-322, doi: 10.1016/j.gca.2021.04.012.

Gutjahr, M., L. Bordier, E. Douville, J. Farmer, G. Foster, E. Hathorne, B. Hönisch, D. Lemarchand, P. Louvat, M. McCulloch, J. Noireaux, N. Pallavicini, J. Rae, I. Rodushkin, P. Roux, J. Stewart, F. Thil, C.-F. You, "Sub-permil interlaboratory consistency for solution-based boron isotope analyses on marine carbonates", Geostandards and Geoanalytical Research, Vol. 45., No. 1, p. 59-75, doi: 10.1111/ggr.12364.

Tierney, J. E., C. J. Poulsen, I. P. Montañez, T. Bhattacharya, R. Feng, H. L. Ford, B. Hönisch, G. N. Inglis, S. V. Petersen, N. Sagoo, C. R. Tabor, K. Thirumalai, J. Zhu, N. J. Burls, G. L. Foster, Y. Goddéris, B. T. Huber, L. C. Ivany, S. Kirtland Turner, D. J. Lunt, J. C. McElwain, B. J. W. Mills, B. L. Otto-Bliesner, A. Ridgwell and Y. G. Zhang (2020). "Past climates inform our future." Science 370 (6517): eaay3701, doi: 10.1126/science.aay3701.

Haynes, L.L. & B. Hönisch, "The Seawater Carbon Inventory at the Paleocene-Eocene Thermal Maximum", Proceedings of the National Academy of Sciences, 202003197.

Holland, K., O. Branson, *L.L. Haynes, B. Hönisch, K. Allen, A.D.R. Russell, J. Fehrenbacher, H.J. Spero, S.M. Eggins (2020), "Constraining multiple controls on planktic foraminiferal Mg/Ca", Geochimica et Cosmochimica Acta 273, 116-136, doi: 10.1016/j.gca.2020.01.015.

Harper, D.T., B. Hönisch, R.E. Zeebe, G. Schaffer, *L. Haynes, E. Thomas, J.C. Zachos, (2020). "The Magnitude of Surface Ocean Acidification and Carbon Release During Eocene Thermal Maximum 2 (ETM-2) compared to the Paleocene-Eocene Thermal Maximum", Paleoceanography and Paleoclimatology 35, e2019PA003699, doi: 10.1029/2019PA003699.

*Haynes, L.L., Hönisch, B., Holland, K., Rosenthal, Y. and Eggins, S.M. (2019) Evaluating the planktic foraminiferal B/Ca proxy for application to deep time paleoceanography. Earth and Planetary Science Letters 528, 115824, doi: 10.1016/j.epsl.2019.115824.

*Farmer, J.R., B. Hönisch, L.L. Haynes, D. Kroon, S. Jung, H.L. Ford, M.E. Raymo, D.B. Bell, M. Jaume-Seguí, S. Goldstein, L.D. Pena, M. Yehudai, and J. Kim, "Deep Atlantic Ocean carbon storage and the rise of 100,000-year glacial cycles", Nature Geoscience, doi:10.1038/s41561-019-0334-6.

Bonnin, E.A., Z. Zhu, J.S. Fehrenbacher, A.D. Russell, B. Hönisch, H.J. Spero, A.C. Gagnon, "Submicron Sodium Banding in Planktic Foraminifera Shells", Geochimica at Cosmochimica Acta 253, p. 127-141, doi: 10.1016/j.gca.2019.03.024.

Hönisch, B., S.M. Eggins, *L.L. Haynes, K.A. Allen, K. Holland, K. Lorbacher, "Boron proxies in Paleoceanography and Paleoclimatology" in Analytical Methods in Earth and Environmental Science, 264 pp., First Edition, John Wiley & Sons Ltd., 2019, doi: 10.1016/j.gca.2019.03.024.

Flöter, S., J. Fietzke, *J.R. Farmer, M. Gutjahr, B. Hönisch, G. Nehrke, A. Eisenhauer, "Ontogenetic micro-structural constraints towards the potential of bamboo coral Mg/Ca and Ba/Ca to record ambient water temperature and dissolved [Si] and [Ba]", Geochimica et Cosmochimica Acta 248, p. 43-60, doi: 10.1016/j.gca.2018.12.027.

*Farmer, J.R., O. Branson, J. Uchikawa, D. Penman, B. Hönisch, R. Zeebe, "Boric acid and borate incorporation in inorganic calcite inferred from boron isotopes and surface kinetic modeling", Geochimica et Cosmochimica Acta 244, p. 229-247, doi:10.1016/j.gca.2018.10.008 .

§Dyez, K.A., B. Hönisch, G. Schmidt, "Early Pleistocene obliquity-scale pCO2 variability at 1.5 million years ago", Paleoceanography and Paleoclimatology, 33, doi: 10.1029/2018PA003349.

T.L. Babila, D.E. Penman, B. Hönisch, D. C. Kelly, T. J. Bralower, Y. Rosenthal, J.C. Zachos (2018): Capturing the global signature of surface ocean acidification during the Paleocene-Eocene Thermal Maximum, Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 376 (2130), doi: 10.1098/rsta.2017.0072.

Fehrenbacher, J.S., Russell, A.D., Davis, C.V., Spero, H.J., Chu, E. and Hönisch, B. (2018) Ba/Ca ratios in the non-spinose planktic foraminifer Neogloboquadrina dutertrei: Evidence for an organic aggregate microhabitat. Geochimica et Cosmochimica Acta 236, 361-372, doi: 10.1016/j.gca.2018.03.008.

Harper, D.T., R. Zeebe, B. Hönisch, C. Schrader, L. Lourens, J. Zachos, “Subtropical sea surface warming and increased salinity during Eocene Thermal Maximum 2”, Geology, Vol. 6, p. 187-190, 2017, doi: doi.org/10.1130/G39658.1.

*L.L. Haynes, B. Hönisch, §K. Dyez, K. Holland, Y. Rosenthal, *C. Fish, A. Subhas, J. Rae, “Calibration of the B/Ca proxy in the planktic foraminifer Orbulina universa to Paleocene seawater conditions”, Paleoceanography, Volume 32, Issue 6, P. 580-599, doi: 10.1002/2016PA003069.

K. Holland, S. Eggins, B. Hönisch, *L. Haynes, “Calcification rate and shell chemistry response of the planktic foraminifer Orbulina universa to changes in microenvironment seawater carbonate chemistry”, Earth and Planetary Science Letters, Volume 464, Pages 124-134, doi: 10.1016/j.epsl.2017.02.018.

M.M. Ezat, T.L. Rasmussen, D.J. R. Thornalley, J. Olsen, L.C. Skinner, B. Hönisch, J. Groeneveld, “Ventilation history of Nordic seas overflows revealed by species-specific benthic foraminiferal 14C dates: 30–10 ka, Paleoceanography, Volume 32, Issue 2, p.172-181, doi: 10.1002/2016PA003053.

M.M. Ezat, T.L. Rasmussen, B. Hönisch, J. Groeneveld, P. deMenocal, “Episodic release of CO2 from the high latitude North Atlantic during the last 135 kyr”, Nature Communications, doi: 10.1038/ncomms14498.

Paytan, A., B. Hönisch, “Ocean Acidification – a Paleoperspective, ASLO e-lecture, doi: 10.1002/loe2.10003.

*Allen, K.A., B. Hönisch, S.M. Eggins, *L.L. Haynes, Y. Rosenthal, J. Yu, “Trace element proxies for surface ocean conditions: A synthesis of culture calibrations with planktic foraminifera”, Geochimica et Cosmochimica Acta 193, p. 197-221, doi: 10.1016/j.gca.2016.08.015.

*Farmer, J.R., B. Hönisch, J. Uchikawa, “Single laboratory comparison of MC-ICP-MS and N-TIMS boron isotope analyses in marine carbonates”, Chemical Geology 447, P. 173-182, doi: 10.1016/j.chemgeo.2016.11.008.

Branson, O., E. Bonnin, D. Perea, H.J. Spero, Z. Zhu, M. Winters, B. Hönisch, A. Russell, J. Fehrenbacher, A.C. Gagnon, “Nanometer-Scale Chemistry of a Calcite Biomineralization Template: Implications for Skeletal Composition and Nucleation”, Proceedings of the National Academy of Sciences 113, p. 12934-12939m, doi: 10.1073/pnas.1522864113.

Past Interglacial Working Group of PAGES: A. Berger, M. Crucifix, D.A. Hodell, C. Mangili, J.F. McManus, B. Otto-Bliesner, K. Pol, D. Raynaud, L.C. Skinner, P.C. Tzedakis, E.W. Wolff, Q.Z. Yin, A. Abe-Ouchi, C. Barbante, V. Brovkin, I. Cacho, E. Capron, P. Ferretti, A. Ganopolski, J.O. Grimalt, B. Hönisch, K. Kawamura, A. Landais, V. Margari, B. Martrat, V. Masson-Delmotte, Z. Mokeddem, F.Parrenin, A.A. Prokopenko, H. Rashid, M. Schulz, N. Vazquez Riveiros, “Interglacials of the last 800,000 years”, Reviews of Geophysics, Vol. 54, Issue 1, p. 162-219, doi: 10.1002/2015RG000482.

*Farmer, J.R., L.F. Robinson, B. Hönisch, “Growth rate determinations from radiocarbon in bamboo corals (genus Keratoisis)”, Deep Sea Research I, Oceanographic Research Papers 105, 26-40.

Allen, K.A., E. Sikes, B. Hönisch, A.C. Elmore, T.P. Guilderson, Y. Rosenthal, R. F. Anderson, “Southwest Pacific deep water carbonate chemistry linked to high southern latitude climate during the last glacial termination”, submitted to Quaternary Science Reviews 122, P. 180-191, doi: 10.1016/j.quascirev.2015.05.007.

Levin, L.A., B. Hönisch, and C.A. Frieder, “Geochemical proxies for estimating faunal exposure to ocean acidification”, Oceanography 28(2): 62–73, doi: 10.5670/oceanog.2015.32.

*Farmer, J.R., B. Hönisch, L.F. Robinson, T.M. Hill, “Investigating the effects of seawater-pH and biomineralization on the boron isotopic composition of deep-sea bamboo corals”, Geochimica et Cosmochimica Acta 155, p. 86-106, doi: 10.1016/j.gca.2015.01.018.

Spero, H.J., S.M. Eggins, A.D. Russell, L. Vetter, M.R. Kilburn, B. Hönisch, “Timing and Mechanism for intratest Mg/Ca variability in living planktic foraminifera”, Earth and Planetary Science Letters 409, doi: 10.1016/j.epsl.2014.10.030.

Penman, D.E., B. Hönisch, R.E. Zeebe, J.C. Zachos, “Rapid and sustained surface ocean acidification during the Paleocene-Eocene Thermal Maximum”, Paleoceanography 29, doi: 10.1002/2014pa002621.

Foster, G., B. Hönisch, G. Paris, G.S. Dwyer, J.W.B. Rae, T. Elliott, J. Gaillardet, N.G. Hemming, P. Louvat, A. Vengosh, “Interlaboratory comparison of Boron isotope analyses of boric acid, seawater and marine CaCO3 by MC-ICP-MS and NTIMS”, Chemical Geology 358, p. 1-14, doi: 10.1016/j.chemgeo.2013.08.027.

Hönisch, B., K.A. Allen*, D.W. Lea, H.J. Spero, S.M. Eggins, J. Arbuszewski, P. deMenocal, Y. Rosenthal, A.D. Russell, “The influence of salinity on Mg/Ca ratios of cultured and core-top planktic foraminifers”, Geochimica et Cosmochimica Acta 121, p. 196-213, doi: 10.1016/j.gca.2013.07.028.

§Raitzsch, M., B. Hönisch, “Cenozoic boron isotope variations in benthic foraminifers”, Geology 40, 5, 591-594, doi: 10.1130/g34031.1.

Vetter, L., R. Kozdon, C.I. Mora, S.M. Eggins, J.W. Valley, B. Hönisch, H.J. Spero, “Micron-scale intrashell oxygen isotope variation in cultured planktic foraminifers”, Geochimica et Cosmochimica Acta 107, p. 267-278, doi: 10.1016/j.gca.2012.12.046.

*Penman, D., B. Hönisch, E.T. Rasbury, N.G. Hemming, S.A. Hemming, “Boron, carbon, and oxygen isotopic composition of brachiopod shells: intra-shell variability, controls, and potential as a paleo-pH recorder”, Chemical Geology 340, p. 32-39, doi: 10.1016/j.chemgeo.2012.11.016.

Paleosens Project Members: Rohling, E., A. Sluijs, H.A. Dijkstra, P. Köhler, R.S.W. van de Wal, A.S. von der Heydt, with D. Beerling, A. Berger, P.K. Bijl, M. Crucifix, R. deConto, S.S. Drijfhout, A. Fedorov, G. Foster, A. Ganopolski, J. Hansen, B. Hönisch, H. Hooghiemstra, M. Huber, P. Huybers, R. Knutti, D.W. Lea, L.J. Lourens, D. Lunt, V. Masson-Demotte, M. Medina-Elizalde, B. Otto-Bliesner, M. Pagani, H. Pälike, H. Renssen, D.L. Royer, M. Siddall, P. Valdes, J.C. Zachos, R.E. Zeebe, “Making sense of palaeoclimate sensitivity", Nature 491, 683-691, doi: 10.1038/nature11574.

*Allen, K.A., B. Hönisch, S.M. Eggins, Y. Rosenthal, “Environmental controls on B/Ca in tests of the tropical planktic foraminifer species Globigerinoides ruber and G. sacculifer”, EPSL 351-352 (2012) 270–280, doi: 10.1016/j.epsl.2012.07.004.

*Allen, K.A., B. Hönisch, “The planktic foraminiferal B/Ca proxy for seawater carbonate chemistry: A critical evaluation”, EPSL 345-348, p. 203-211, doi: 10.1016/j.epsl.2012.06.012.

Hönisch, B., A. Ridgwell, D.N. Schmidt, E. Thomas, S.J. Gibbs, A. Sluijs, R.E. Zeebe, L. Kump, R.C. Martindale, S.E. Greene, W. Kiessling, J. Ries, J. Zachos, D.L. Royer, S. Barker, T.M. Marchitto Jr., R. Moyer, C. Pelejero, P. Ziveri, G.L. Foster, and B. Williams, “The Geological Record of Ocean Acidification”, invited review, Science 335, 1058 (2012), doi: 10.1126/science.1208277.

§Bartoli, G., B. Hönisch, and R.E. Zeebe, Pliocene atmospheric CO2 decline during the intensification of northern hemisphere glaciations”, Paleoceanography 26, PA4213, doi:10.1029/2010PA002055, 2011. Article highlighted in Nature Geoscience Research Highlight, Vol. 4, p. 734 (2011), doi: 10.1038/ngeo1315.

*Allen, K.A., B. Hönisch, J. Yu, S. Eggins, H. Spero, H. Elderfield, “Controls on boron incorporation in cultured tests of the planktic foraminifer Orbulina universa, Earth and Planetary Science Letters 309, p. 291-301.

Hönisch, B., K.A. Allen*, A.D. Russell, S.M. Eggins, J. Bijma, H. J. Spero, D.W. Lea, and J. Yu, “Planktic foraminifers as recorders of seawater Ba/Ca”, Marine Micropaleontology 79, p. 52-57.

Katz, M.E., Cramer, B.S., Hönisch, B., Miller, K.G., Rosenthal, Y., and Wright, J.D., “Traditional and Emerging Geochemical Proxies in Foraminifera”. J. Foram. Res., V. 40, No. 2, p. 165-192.

Siddall, M., Hönisch, B., Waelbroeck, C., Huybers, P., 2009. Changes in the deep Pacific temperature during the mid-Pleistocene transition. Quaternary Science Reviews, Venice November 2009 EPICA meeting special issue, doi: 10.1016/j.quascirev.2009.05.011.

Gussone, N., Hönisch, B., Heuser, A., Hemleben, C., Spindler, M., and Eisenhauer, A., 2009. Controls of calcium isotope ratios in planktonic foraminifera. Geochimica et Cosmochimica Acta 73, 7241–7255.

Hönisch, B., Hemming, N.G., Archer, D., Siddall, M., McManus, J.F., 2009, Atmospheric Carbon Dioxide Concentration over the Mid Pleistocene Transition, Science 324, p. 1551-1554.

Aggarwal, J., Böhm, F., Foster, G., Halas, S., Hönisch, B., Jiang, S.-Y., Kosler, J., Liba, A., Rodushkin, I., Sheehan, T., Shen, J. J.-S., Tonarini, S., Xie, Q., You, C.-F., Zhao, Z.-Q., Zuleger, E., 2009. How well do non-traditional stable isotope results compare between different laboratories: results from the interlaboratory comparison of boron isotope measurements. J. Anal. At. Spectrom., doi: 10.1039/b815240c.

Zeebe, R. E., Bijma, J., Hönisch, B., Sanyal, A., Spero, H. J., and Wolf-Gladrow, D. A., in press. Vital effects and beyond: A modelling perspective on developing paleoceanographic proxy relationships in foraminifera. In: James, R., Austin, W. E. N., Clarke, L., and Rickaby, R.E.M. Eds.), Biogeochemical controls on palaeoceanographic proxies. The Geological Society, London, special publications 2008, v. 303, 45-58.

Hönisch, B., Bickert, T., and Hemming, N. G., submitted. Modern and Pleistocene Boron Isotope Composition of the Benthic Foraminifer Cibicidoides wuellerstorfi. Earth and Planetary Science Letters 272, 1-2, 309-318.

Hönisch, B., Yu, J., and Hemming, N.G., 2008. Pleistocene records of marine carbonate chemistry. PAGES news 16, 11-12.

Yu, J., Elderfield, H., and Hönisch, B., 2007. B/Ca in planktonic foraminifera as a proxy for surface seawater pH. Paleoceanography 22.

Hönisch, B., Hemming, N. G., and Loose, B., 2007. Comment on "A critical evaluation of the boron isotope-pH proxy: The accuracy of ancient ocean pH estimates" by M. Pagani, D. Lemarchand, A. Spivack and J. Gaillardet. Geochimica et Cosmochimica Acta 71, 1636-1641.

Hemming, N. G. and Hönisch, B., 2007. Boron Isotopes in Marine Carbonate Sediments and the pH of the Ocean. In: Vernal, C. H.-M. a. A. D. (Ed.), Proxies in Late Cenozoic Paleoceanography. Elsevier.

Hönisch, B. and Hall, J., 2007. Carbon cycle proxies, Encyclopedia of Quaternary Sciences. p. 1700-1710, Editor-in-Chief: S.A. Elias, Elsevier, ISBN (Set): 0 444 51919 X / 978 0 444 51919 1.

Hönisch, B. and Hemming, N. G., 2005. Surface ocean pH response to variations in pCO2 through two full glacial cycles. Earth and Planetary Science Letters 236, 305-314.

Hönisch, B. and Hemming, N. G., 2004. Ground-truthing the boron isotope paleo-pH proxy in planktonic foraminifera shells: Partial dissolution and shell size effects. Paleoceanography 19, doi: 10.1029/2004PA001026.

Hönisch, B., Hemming, N. G., Grottoli, A. G., Amat, A., Hanson, G. N., and Bijma, J., 2004. Assessing scleractinian corals as recorders for paleo-pH: Empirical calibration and vital effects. Geochim. Cosmochim. Acta 68, 3675-3685.

Russell, A. D., Hönisch, B., Spero, H. J., and Lea, D. W., 2004. Effects of changes in seawater carbonate ion concentration and temperature on shell U/Ca, Mg/Ca, and Sr/Ca of planktonic foraminifera. Geochim. Cosmochim. Acta 68, 4347-4361.

Hönisch, B., Bijma, J., Russell, A. D., Spero, H. J., Palmer, M. R., Zeebe, R. E., and Eisenhauer, A., 2003. The influence of symbiont photosynthesis on the boron isotopic composition of foraminifera shells. Mar. Micropaleontol. 49, 87-96.

Zeebe, R. E., Wolf-Gladrow, D. A., Bijma, J., and Hönisch, B., 2003. Vital effects in foraminifera do not compromise the use of d11B as a paleo-pH indicator: Evidence from modeling. Paleoceanography 18.

Hönisch, B., 2002. Stable isotope and trace element composition of foraminiferal calcite - from incorporation to dissolution. Dissertation.

Bijma, J., Hönisch, B., and Zeebe, R. E., 2002. Impact of the ocean carbonate chemistry on living foraminiferal shell weight: Comment on "Carbonate ion concentration in glacial-age deep waters of the Caribbean Sea" by W.S. Broecker and E. Clark. Geochemistry Geophysics Geosystems 3, 10.1029/2002GC000388.

Crone, C., Vering, G., Hönisch, B., Bijma, J., and Arlinghaus, H. F., 2002. Investigation of planktonic foraminifera with ToF-SIMS. Surf. Interface Anal. 34, p. 298-301.