PP43E:
Biogeochemical Cycles in the Past: Long-Term Commitments in the Future II


Session ID#: 10840

Session Description:
Biogeochemical cycles have been dramatically altered during the Anthropocene as for example prominently evidenced by changes in greenhouse gas concentrations. Many biogeochemical cycles have turnover times much longer than the instrumental record and their natural variability, trends, and time scales of response can only be quantified using paleo-observations and paleo-simulations. These observations and coupled biogeochemistry-climate models are key to predict how long-term biogeochemical changes and feedbacks may evolve in the future.

In this session latest results from marine, terrestrial and cryospheric archives will be presented to quantify past changes in biogeochemical cycles on annual, decadal, millennial, up to orbital time scales and contrasted to state-of-the-art biogeochemical modeling. Special focus will be placed on the implications of these paleo-results for defining natural boundaries of the respective biogeochemical cycles, the potential that we have passed these boundaries in recent decades and the risk of irreversible or abrupt changes in the future.
Primary Convener:  Hubertus Fischer, University of Bern, Climate and Environmental Physics and Oeschger Centre for Climate Research, Bern, Switzerland
Conveners:  Baerbel Hoenisch, Columbia University of New York, Palisades, NY, United States, Laurie Menviel, University of New South Wales, Climate Change Research Centre, Sydney, NSW, Australia and Edward J Brook, Oregon State University, College of Earth, Ocean, and Atmospheric Sciences, Corvallis, OR, United States
Chairs:  Hubertus Fischer, University of Bern, Climate and Environmental Physics and Oeschger Centre for Climate Research, Bern, Switzerland and Laurie Menviel, University of New South Wales, Climate Change Research Centre, Sydney, NSW, Australia
OSPA Liaison:  Hubertus Fischer, University of Bern, Climate and Environmental Physics and Oeschger Centre for Climate Research, Bern, Switzerland

Cross-Listed:
  • A - Atmospheric Sciences
  • B - Biogeosciences
  • GC - Global Environmental Change
Co-Sponsor(s):
  • IGBP: International Geosphere-Biosphere Programme -
Index Terms:

0315 Biosphere/atmosphere interactions [ATMOSPHERIC COMPOSITION AND STRUCTURE]
0414 Biogeochemical cycles, processes, and modeling [BIOGEOSCIENCES]
0473 Paleoclimatology and paleoceanography [BIOGEOSCIENCES]
1622 Earth system modeling [GLOBAL CHANGE]

Abstracts Submitted to this Session:

Abrupt Atmospheric Methane Increases Associated With Hudson Strait Heinrich Events (Invited) (58927)
Rachael Rhodes, University of Cambridge, Department of Earth Sciences, Cambridge, United Kingdom, Edward Brook, Oregon State University, College of Earth, Ocean, and Atmospheric Sciences, Corvallis, United States, John C H Chiang, University of California Berkeley, Berkeley, CA, United States, Thomas Blunier, Niels Bohr Institute - University of Copenhagen, Copenhagen, Denmark, Olivia Jayne Maselli, Desert Research Instititute, Reno, NV, United States, Joseph R McConnell, Desert Research Institute Reno, Reno, United States, Daniele Romanini, Joseph Fourier University/CNRS LIPhy, Grenoble, France and Jeffrey P Severinghaus, Scripps Institution of Oceanography, La Jolla, CA, United States
Glacial-Interglacial and Holocene N2O Stable Isotope Changes Constrain Terrestrial N Cycling (72486)
Jochen Schmitt1, Renato Spahni2, Michael Bock2, Barbara Seth3, Benjamin David Stocker4, Xu Ri5, Adrian Schilt6, Edward J Brook7, Bette L Otto-Bliesner8, Zhengyu Liu9, Iain Colin Prentice10, Hubertus Fischer1 and Fortunat Joos11, (1)University of Bern, Climate and Environmental Physics and Oeschger Centre for Climate Research, Bern, Switzerland, (2)University of Bern, Bern, Switzerland, (3)University of Bern, Climate and Environmental Physics and Oeschger Center for Climate Change Research, Bern, Switzerland, (4)Imperial College London, London, SW7, United Kingdom, (5)Chinese Academy of Sciences, The Aerospace Information Research Institute, Beijing, China, (6)Oregon State University, Corvallis, OR, United States, (7)Oregon State University, College of Earth, Ocean, and Atmospheric Sciences, Corvallis, OR, United States, (8)NSF National Center for Atmospheric Research, Boulder, United States, (9)The Ohio State University, Department of Geography, Columbus, United States, (10)Northwest A&F University, Yangling, China, (11)Univ Bern, Climate and Environmental Physics, Bern, Switzerland
Running hotter, faster, shallower: acceleration of the marine nitrogen cycle from the Last Glacial Maximum to the pre-industrial, and implications for the future (Invited) (61039)
Eric D Galbraith, ICREA Catalan Institution for Research and Advanced Studies, Barcelona, Spain
Systematically enhanced subarctic Pacific stratification and nutrient utilization during glacials (75488)
Karla P Knudson, Lamont-Doherty Earth Observatory of Columbia University, Palisades, United States and Ana Christina Ravelo, University of California-Santa Cruz, Santa Cruz, CA, United States
Carbon cycle and climate commitments from early human interference (Invited) (60111)
Kirsten Zickfeld, Simon Fraser University, Geography, Burnaby, BC, Canada and Susan Solomon, Massachusetts Institute of Technology, Cambridge, MA, United States
Synergetic impact of Southern Ocean ventilation and -export production on atmospheric CO2 during the last deglacial and glacial periods (83999)
Julia Gottschalk1, Luke Cameron Skinner1, Joerg Albert Lippold2, Hendrik Vogel3, Norbert Frank4, Sam Jaccard3 and Claire Waelbroeck5, (1)University of Cambridge, Cambridge, United Kingdom, (2)University of Bern, Bern, Switzerland, (3)University of Bern, Institute of Geological Sciences and Oeschger Centre for Climate Change Research, Bern, Switzerland, (4)University of Heidelberg, Institute of Environmental Physics, Heidelberg, Germany, (5)CNRS, Paris Cedex 16, France
Southern Ocean abyssal oxygenation linked to the air-sea partitioning of carbon throughout the last glacial cycle (72635)
Sam Jaccard, University of Bern, Institute of Geological Sciences and Oeschger Centre for Climate Change Research, Bern, Switzerland, Eric D Galbraith, McGill University, Montreal, QC, Canada, Alfredo Martinez-Garcia, Max-Planck Institute for Chemistry, Climate Geochemistry Department, Mainz, Germany and Robert F Anderson, Columbia University of New York, Palisades, NY, United States
Did the North Atlantic Ocean sequester more CO2 during the last glacial? (Invited) (58874)
Jimin Yu, Australian National University, Research School of Earth Sciences, Canberra, ACT, Australia, David J Thornalley, University College London, Dept. of Geography, London, United Kingdom, Zhangdong Jin, IEE Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China, Eelco Johan Rohling, Utrecht University, Department of Earth Sciences, Utrecht, Netherlands, Laurie Menviel, University of New South Wales, Climate Change Research Centre, Sydney, NSW, Australia and I. Nicholas McCave, University of Cambridge, Cambridge, United Kingdom

See more of: Paleoceanography and Paleoclimatology