noaa-forcing-13136 LOSCAR Model Paleocene-Eocene Thermal Maximum pCO2 Output Zeebe, R.E. LOSCAR Model Paleocene-Eocene Thermal Maximum pCO2 Output 2012-07-11 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/13136 Investigator R.E. Zeebe earth science paleoclimate climate forcing|paleoclimatic modeling age,null,null,calendar year,null,climate forcing|paleoclimatic modeling,null,null,N,years from start of model simulation earth science paleoclimate climate forcing|paleoclimatic modeling carbon dioxide,null,null,parts per million,null,climate forcing|paleoclimatic modeling,null,null,N,null earth science paleoclimate climate forcing carbon dioxide geoscientificInformation carbon cycle 56000000 cal yr BP 55800000 cal yr BP Complete -90 90 -180 180 Geographic Region Global Global>LATITUDE >LONGITUDE None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Zeebe, R.E. 2012. LOSCAR: Long-term Ocean-atmosphere-Sediment CArbon cycle Reservoir Model v2.0.4. Geosci. Model Dev., 5, 149-166 www.geosci-model-dev.net/5/149/2012/ doi:10.5194/gmd-5-149-2012

The LOSCAR model is designed to efficiently compute the partitioning of carbon between ocean, atmosphere, and sediments on time scales ranging from centuries to millions of years. While a variety of computationally inexpensive carbon cycle models are already available, many are missing a critical sediment component, which is indispensable for long-term integrations. One of LOSCAR's strengths is the coupling of ocean-atmosphere routines to a computationally efficient sediment module. This allows, for instance, adequate computation of CaCO3 dissolution, calcite compensation, and long-term carbon cycle fluxes, including weathering of carbonate and silicate rocks. The ocean component includes various biogeochemical tracers such as total carbon, alkalinity, phosphate, oxygen, and stable carbon isotopes. LOSCAR's configuration of ocean geometry is flexible and allows for easy switching between modern and paleo-versions. We have previously published applications of the model tackling future projections of ocean chemistry and weathering, pCO2 sensitivity to carbon cycle perturbations throughout the Cenozoic, and carbon/calcium cycling during the Paleocene-Eocene Thermal Maximum. The focus of the present contribution is the detailed description of the model including numerical architecture, processes and parameterizations, tuning, and examples of input and output. Typical CPU integration times of LOSCAR are of order seconds for several thousand model years on current standard desktop machines. The LOSCAR source code in C can be obtained from the author by sending a request to loscar.model@gmail.com. STUDY NOTES: pCO2 output for the Palaeocene-Eocene Thermal Maximum from LOSCAR model (Long-term Ocean-atmosphere-Sediment CArbon cycle Reservoir Model) Model run is for 200,000 y after Paleocene-Eocene boundary (~56 Ma)

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/loscar-petm-co2.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/climate_forcing/trace_gases/loscar-petm-co2.xls USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11