Articles | Volume 17, issue 8
https://doi.org/10.5194/bg-17-2219-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-17-2219-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
22 Apr 2020
Research article |
| 22 Apr 2020
| 22 Apr 2020
Variable C∕P composition of organic production and its effect on ocean carbon storage in glacial-like model simulations
Department of Meteorology, Bolin Centre for Climate Research, Stockholm University, 106 91 Stockholm, Sweden
Department of Geosciences, University of Arizona, Tucson, AZ 85721, USA
Jonas Nycander
Department of Meteorology, Bolin Centre for Climate Research, Stockholm University, 106 91 Stockholm, Sweden
Andy Ridgwell
Department of Earth Sciences, University of California–Riverside, Riverside, CA 92521, USA
School of Geographical Sciences, Bristol University, Bristol BS8 1SS, UK
Kevin I. C. Oliver
National Oceanography Centre, Southampton, University of Southampton, Southampton SO14 3ZH, UK
Carlye D. Peterson
Department of Earth Sciences, University of California–Riverside, Riverside, CA 92521, USA
Johan Nilsson
Department of Meteorology, Bolin Centre for Climate Research, Stockholm University, 106 91 Stockholm, Sweden
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Christian Stranne, Larry Mayer, Martin Jakobsson, Elizabeth Weidner, Kevin Jerram, Thomas C. Weber, Leif G. Anderson, Johan Nilsson, Göran Björk, and Katarina Gårdfeldt
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Malin Ödalen, Jonas Nycander, Kevin I. C. Oliver, Laurent Brodeau, and Andy Ridgwell
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Göran Björk, Martin Jakobsson, Karen Assmann, Leif G. Andersson, Johan Nilsson, Christian Stranne, and Larry Mayer
Ocean Sci., 14, 1–13, https://doi.org/10.5194/os-14-1-2018, https://doi.org/10.5194/os-14-1-2018, 2018
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This study presents detailed bathymetric data along with hydrographic data at two deep passages across the Lomonosov Ridge in the Arctic Ocean. The southern channel is relatively smooth with a sill depth close to 1700 m. Hydrographic data reveals an eastward flow in the southern part and opposite in the northern part. The northern passage is characterized by a narrow and steep ridge with a sill depth of 1470 m. Here, water exchange appears to occur in well-defined but irregular vertical layers.
Natalie S. Lord, Michel Crucifix, Dan J. Lunt, Mike C. Thorne, Nabila Bounceur, Harry Dowsett, Charlotte L. O'Brien, and Andy Ridgwell
Clim. Past, 13, 1539–1571, https://doi.org/10.5194/cp-13-1539-2017, https://doi.org/10.5194/cp-13-1539-2017, 2017
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The Arctic and Pacific oceans are connected by the presently ~53 m deep Bering Strait. During the last glacial period when the sea level was lower than today, the Bering Strait was exposed. Humans and animals could then migrate between Asia and North America across the formed land bridge. From analyses of sediment cores and geophysical mapping data from Herald Canyon north of the Bering Strait, we show that the land bridge was flooded about 11 000 years ago.
Johan Nilsson, Martin Jakobsson, Chris Borstad, Nina Kirchner, Göran Björk, Raymond T. Pierrehumbert, and Christian Stranne
The Cryosphere, 11, 1745–1765, https://doi.org/10.5194/tc-11-1745-2017, https://doi.org/10.5194/tc-11-1745-2017, 2017
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Recent data suggest that a 1 km thick ice shelf extended over the glacial Arctic Ocean during MIS 6, about 140 000 years ago. Here, we theoretically analyse the development and equilibrium features of such an ice shelf. The ice shelf was effectively dammed by the Fram Strait and the mean ice-shelf thickness was controlled primarily by the horizontally integrated mass balance. Our results can aid in resolving some outstanding questions of the state of the glacial Arctic Ocean.
Rosanna Greenop, Mathis P. Hain, Sindia M. Sosdian, Kevin I. C. Oliver, Philip Goodwin, Thomas B. Chalk, Caroline H. Lear, Paul A. Wilson, and Gavin L. Foster
Clim. Past, 13, 149–170, https://doi.org/10.5194/cp-13-149-2017, https://doi.org/10.5194/cp-13-149-2017, 2017
Short summary
Short summary
Understanding the boron isotopic composition of seawater (δ11Bsw) is key to calculating absolute estimates of CO2 using the boron isotope pH proxy. Here we use the boron isotope gradient, along with an estimate of pH gradient, between the surface and deep ocean to show that the δ11Bsw varies by ~ 2 ‰ over the past 23 million years. This new record has implications for both δ11Bsw and CO2 records and understanding changes in the ocean isotope composition of a number of ions through time.
Giang T. Tran, Kevin I. C. Oliver, András Sóbester, David J. J. Toal, Philip B. Holden, Robert Marsh, Peter Challenor, and Neil R. Edwards
Adv. Stat. Clim. Meteorol. Oceanogr., 2, 17–37, https://doi.org/10.5194/ascmo-2-17-2016, https://doi.org/10.5194/ascmo-2-17-2016, 2016
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In this work, we combine the information from a complex and a simple atmospheric model to efficiently build a statistical representation (an emulator) of the complex model and to study the relationship between them. Thanks to the improved efficiency, this process is now feasible for complex models, which are slow and costly to run. The constructed emulator provide approximations of the model output, allowing various analyses to be made without the need to run the complex model again.
J. D. Wilson, A. Ridgwell, and S. Barker
Biogeosciences, 12, 5547–5562, https://doi.org/10.5194/bg-12-5547-2015, https://doi.org/10.5194/bg-12-5547-2015, 2015
Short summary
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We explore whether ocean model transport rates, in the form of a transport matrix, can be used to estimate remineralisation rates from dissolved nutrient concentrations and infer vertical fluxes of particulate organic carbon. Estimated remineralisation rates are significantly sensitive to uncertainty in the observations and the modelled circulation. The remineralisation of dissolved organic matter is an additional source of uncertainty when inferring vertical fluxes from remineralisation rates.
N. S. Jones, A. Ridgwell, and E. J. Hendy
Biogeosciences, 12, 1339–1356, https://doi.org/10.5194/bg-12-1339-2015, https://doi.org/10.5194/bg-12-1339-2015, 2015
Short summary
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Production of calcium carbonate by coral reefs is important in the global carbon cycle. Using a global framework we evaluate four models of reef calcification against observed values. The temperature-only model showed significant skill in reproducing coral calcification rates. The absence of any predictive power for whole reef systems highlights the importance of coral cover and the need for an ecosystem modelling approach accounting for population dynamics in terms of mortality and recruitment.
A. Stigebrandt, R. Rosenberg, L. Råman Vinnå, and M. Ödalen
Ocean Sci., 11, 93–110, https://doi.org/10.5194/os-11-93-2015, https://doi.org/10.5194/os-11-93-2015, 2015
Short summary
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The hydrographical and ecological changes in the deep part of the Bornholm Basin in response to pumping well-oxygenated so-called winter water down to the greatest depth are investigated. By pumping 1000 m3s-1, the rates of water exchange and oxygen supply increase by 2.5 and 3 times, respectively. Anoxic bottoms should no longer occur and hypoxic events will become rare. This should mean much improved conditions for successful cod reproduction, extensive colonization of fauna on earlier periodi
M. Löfverström, R. Caballero, J. Nilsson, and J. Kleman
Clim. Past, 10, 1453–1471, https://doi.org/10.5194/cp-10-1453-2014, https://doi.org/10.5194/cp-10-1453-2014, 2014
R. Death, J. L. Wadham, F. Monteiro, A. M. Le Brocq, M. Tranter, A. Ridgwell, S. Dutkiewicz, and R. Raiswell
Biogeosciences, 11, 2635–2643, https://doi.org/10.5194/bg-11-2635-2014, https://doi.org/10.5194/bg-11-2635-2014, 2014
R. Marsh, A. Sóbester, E. E. Hart, K. I. C. Oliver, N. R. Edwards, and S. J. Cox
Geosci. Model Dev., 6, 1729–1744, https://doi.org/10.5194/gmd-6-1729-2013, https://doi.org/10.5194/gmd-6-1729-2013, 2013
G. Colbourn, A. Ridgwell, and T. M. Lenton
Geosci. Model Dev., 6, 1543–1573, https://doi.org/10.5194/gmd-6-1543-2013, https://doi.org/10.5194/gmd-6-1543-2013, 2013
M. Eby, A. J. Weaver, K. Alexander, K. Zickfeld, A. Abe-Ouchi, A. A. Cimatoribus, E. Crespin, S. S. Drijfhout, N. R. Edwards, A. V. Eliseev, G. Feulner, T. Fichefet, C. E. Forest, H. Goosse, P. B. Holden, F. Joos, M. Kawamiya, D. Kicklighter, H. Kienert, K. Matsumoto, I. I. Mokhov, E. Monier, S. M. Olsen, J. O. P. Pedersen, M. Perrette, G. Philippon-Berthier, A. Ridgwell, A. Schlosser, T. Schneider von Deimling, G. Shaffer, R. S. Smith, R. Spahni, A. P. Sokolov, M. Steinacher, K. Tachiiri, K. Tokos, M. Yoshimori, N. Zeng, and F. Zhao
Clim. Past, 9, 1111–1140, https://doi.org/10.5194/cp-9-1111-2013, https://doi.org/10.5194/cp-9-1111-2013, 2013
M. Berger, J. Brandefelt, and J. Nilsson
Clim. Past, 9, 969–982, https://doi.org/10.5194/cp-9-969-2013, https://doi.org/10.5194/cp-9-969-2013, 2013
P. B. Holden, N. R. Edwards, S. A. Müller, K. I. C. Oliver, R. M. Death, and A. Ridgwell
Biogeosciences, 10, 1815–1833, https://doi.org/10.5194/bg-10-1815-2013, https://doi.org/10.5194/bg-10-1815-2013, 2013
Related subject area
Earth System Science/Response to Global Change: Models, Geological History
Characterizing the marine iodine cycle and its relationship to ocean deoxygenation in an Earth System model
Improving global paleogeography since the late Paleozoic using paleobiology
A model of the methane cycle, permafrost, and hydrology of the Siberian continental margin
A framework for benchmarking land models
Evolution of ancient Lake Ohrid: a tectonic perspective
Keyi Cheng, Andy Ridgwell, and Dalton Hardisty
EGUsphere, https://doi.org/10.5194/egusphere-2024-677, https://doi.org/10.5194/egusphere-2024-677, 2024
Short summary
Short summary
The carbonate paleoredox proxy, I:Ca, has shown its potential in quantifying the redox change in the past ocean, which is of broad importance for understanding climate change and evolution. Here, we tuned and optimized the marine iodine cycling embedded in an Earth System Model “cGENIE” against modern ocean observation, and then tested its ability to estimate I:Ca in the Cretaceous ocean. Our study implies cGENIE’s potential in quantifying redox change in the past using the I:Ca proxy.
Wenchao Cao, Sabin Zahirovic, Nicolas Flament, Simon Williams, Jan Golonka, and R. Dietmar Müller
Biogeosciences, 14, 5425–5439, https://doi.org/10.5194/bg-14-5425-2017, https://doi.org/10.5194/bg-14-5425-2017, 2017
Short summary
Short summary
We present a workflow to link paleogeographic maps to alternative plate tectonic models, alleviating the problem that published global paleogeographic maps are generally presented as static maps and tied to a particular plate model. We further develop an approach to improve paleogeography using paleobiology. The resulting paleogeographies are consistent with proxies of eustatic sea level change since ~400 Myr ago. We make the digital global paleogeographic maps available as an open resource.
D. Archer
Biogeosciences, 12, 2953–2974, https://doi.org/10.5194/bg-12-2953-2015, https://doi.org/10.5194/bg-12-2953-2015, 2015
Short summary
Short summary
Methane hydrate may be stable at the base of the permafrost zone in sediments of the Siberian continental margin, but the sediments' depth below the sea floor precludes a fast response time (order 1-10 years) that would be required for the released methane to have a significant impact on the near-term evolution of Earth's climate. However, the Arctic could amplify anthropogenic climate change by releasing carbon on timescales of centuries or millennia.
Y. Q. Luo, J. T. Randerson, G. Abramowitz, C. Bacour, E. Blyth, N. Carvalhais, P. Ciais, D. Dalmonech, J. B. Fisher, R. Fisher, P. Friedlingstein, K. Hibbard, F. Hoffman, D. Huntzinger, C. D. Jones, C. Koven, D. Lawrence, D. J. Li, M. Mahecha, S. L. Niu, R. Norby, S. L. Piao, X. Qi, P. Peylin, I. C. Prentice, W. Riley, M. Reichstein, C. Schwalm, Y. P. Wang, J. Y. Xia, S. Zaehle, and X. H. Zhou
Biogeosciences, 9, 3857–3874, https://doi.org/10.5194/bg-9-3857-2012, https://doi.org/10.5194/bg-9-3857-2012, 2012
N. Hoffmann, K. Reicherter, T. Fernández-Steeger, and C. Grützner
Biogeosciences, 7, 3377–3386, https://doi.org/10.5194/bg-7-3377-2010, https://doi.org/10.5194/bg-7-3377-2010, 2010
Cited articles
Adams, J. M. and Faure, H.: A new estimate of changing carbon storage on land
since the last glacial maximum, based on global land ecosystem
reconstruction, Glob. Planet. Change, 16, 3–24, 1998. a
Adkins, J. F.: The role of deep ocean circulation in setting glacial climates,
Paleoceanography, 28, 539–561, 2013. a
Archer, D. and Maier-Reimer, E.: Effect of deep-sea sedimentary calcite
preservation on atmospheric CO2 concentration, Nature, 367, 260–263, 1994. a
Berger, W.: Deglacial CO2 buildup: constraints on the coral-reef model,
Palaeogeogr. Palaeocl., 40, 235–253, 1982. a
Bouttes, N., Paillard, D., and Roche, D. M.: Impact of brine-induced stratification on the glacial carbon cycle, Clim. Past, 6, 575–589, https://doi.org/10.5194/cp-6-575-2010, 2010. a
Bouttes, N., Paillard, D., Roche, D. M., Brovkin, V., and Bopp, L.: Last
Glacial Maximum CO2 and δ13C successfully reconciled, Geophys.
Res. Lett., 38, L02705, https://doi.org/10.1029/2010GL044499, 2011. a
Bouttes, N., Roche, D. M., and Paillard, D.: Systematic study of the impact of
fresh water fluxes on the glacial carbon cycle, Clim. Past, 8,
589–607, https://doi.org/10.5194/cp-8-589-2012, 2012. a
Boyle, E. A. and Keigwin, L.: North Atlantic thermohaline circulation during
the past 20,000 years linked to high-latitude surface temperature, Nature,
330, 35–40, 1987. a
Bradtmiller, L., Anderson, R., Sachs, J., and Fleisher, M.: A deeper respired
carbon pool in the glacial equatorial Pacific Ocean, Earth Planet.
Sc. Lett., 299, 417–425, 2010. a
Broecker, W. S.: Glacial to interglacial changes in ocean chemistry, Prog. Oceanogr., 11, 151–197,
https://doi.org/10.1016/0079-6611(82)90007-6,
1982a. a, b
Broecker, W. S.: Ocean chemistry during glacial time, Geochim.
Cosmochim. Ac., 46, 1689–1705, 1982b. a
Brovkin, V., Ganopolski, A., Archer, D., and Rahmstorf, S.: Lowering of glacial
atmospheric CO2 in response to changes in oceanic circulation and marine
biogeochemistry, Paleoceanography, 22, PA4202, https://doi.org/10.1029/2006PA001380, 2007. a
cGENIE GitHub repository: available at: https://github.com/derpycode (last access: 12 April 2020), 2019. a
cGENIE release 1.9.1b: https://doi.org/10.5281/zenodo.1407658, available at:
https://github.com/derpycode/muffindoc/releases/tag/1.9.1b (last access: 12 April 2020),
2018. a
cGENIE release v0.9.5: https://doi.org/10.5281/zenodo.3235761, available at:
https://github.com/derpycode/cgenie.muffin/releases/tag/v0.9.5 (last access: 12 April 2020),
2019. a, b
Chikamoto, M., Abe-Ouchi, A., Oka, A., and Smith, S. L.: Temperature-induced
marine export production during glacial period, Geophys. Res. Lett.,
39, L21601, https://doi.org/10.1029/2012GL053828, 2012. a, b, c, d
Ciais, P., Tagliabue, A., Cuntz, M., Bopp, L., Scholze, M., Hoffmann, G.,
Lourantou, A., Harrison, S. P., Prentice, I. C., Kelley, D., Koven, C., and
Piao, S. L.: Large inert
carbon pool in the terrestrial biosphere during the Last Glacial Maximum,
Nat. Geosci., 5, 74–79, 2012. a
Ciais, P., Sabine, C., Bala, G., Bopp, L., Brovkin, V., Canadell, J., Chhabra,
A., DeFries, R., Galloway, J., Heimann, M., Jones, C., Le Quéré,
C., Myeni, R. B., Piao, S., and Thornton, P.: Carbon and other biogeochemical
cycles, in: Climate Change 2013: The Physical Science Basis, Contribution of
Working Group I to the Fifth Assessment Report of the Intergovernmental Panel
on Climate Change, edited by: Stocker, T. F., Qin, D., Plattner, G. K.,
Tignor, M., Allen, S. K., Boschung, J., Nauels, A., Xia, Y., Bex, V., and
Midgley, P. M., chap. 6, Cambridge University Press, Cambridge,
United Kingdom and New York, NY, USA, 465–570, 2013. a
Crowley, T. J.: Ice age terrestrial carbon changes revisited, Global
Biogeochem. Cy., 9, 377–389, 1995. a
Curry, W. B. and Oppo, D. W.: Glacial water mass geometry and the distribution
of δ13C of ΣCO2 in the western Atlantic Ocean,
Paleoceanography, 20, PA1017, https://doi.org/10.1029/2004PA001021, 2005. a, b
Davies-Barnard, T., Ridgwell, A., Singarayer, J., and Valdes, P.: Quantifying
the influence of the terrestrial biosphere on glacial–interglacial climate
dynamics, Clim. Past, 13, 1381–1401, https://doi.org/10.5194/cp-13-1381-2017,
2017. a, b, c
Eggleston, S. and Galbraith, E. D.: The devil's in the disequilibrium: multi-component analysis of dissolved carbon and oxygen changes under a broad range of forcings in a general circulation model, Biogeosciences, 15, 3761–3777, https://doi.org/10.5194/bg-15-3761-2018, 2018. a
Ganopolski, A. and Brovkin, V.: Simulation of climate, ice sheets and CO2 evolution during the last four glacial cycles with an Earth system model of intermediate complexity, Clim. Past, 13, 1695–1716, https://doi.org/10.5194/cp-13-1695-2017, 2017. a
Garcia, C. A., Baer, S. E., Garcia, N. S., Rauschenberg, S., Twining, B. S.,
Lomas, M. W., and Martiny, A. C.: Nutrient supply controls particulate
elemental concentrations and ratios in the low latitude eastern Indian Ocean,
Nat. Commun., 9, 4868, https://doi.org/10.1038/s41467-018-06892-w, 2018a. a
Garcia, H. E., Weathers, K., Paver, C. R., Smolyar, I., Boyer, T. P.,
Locarnini, R. A., Zweng, M. M., Mishonov, A. V., Baranova, O., Seidov, D.,
and Reagan, J. R.: World Ocean Atlas 2018, Volume 4: Dissolved Inorganic
Nutrients (phosphate, nitrate, silicate), Tech. Rep. 84, NOAA Atlas NESDIS,
35 pp., 2018b. a, b
Garcia, H. E., Weathers, K., Paver, C. R., Smolyar, I., Boyer, T. P.,
Locarnini, R. A., Zweng, M. M., Mishonov, A. V., Baranova, O. K., Seidov, D.,
and Reagan, J. R.: World Ocean Atlas 2018, Volume 3: Dissolved Oxygen,
Apparent Oxygen Utilization, and Oxygen Saturation), Tech. Rep. 82, NOAA
Atlas NESDIS, 38 pp., 2018c. a, b, c
Griffies, S. M.: The Gent–McWilliams skew flux, J. Phys.
Oceanogr., 28, 831–841, 1998. a
Hain, M. P., Sigman, D. M., and Haug, G. H.: Carbon dioxide effects of
Antarctic stratification, North Atlantic Intermediate Water formation, and
subantarctic nutrient drawdown during the last ice age: Diagnosis and
synthesis in a geochemical box model, Global Biogeochem. Cy., 24, GB4023, https://doi.org/10.1029/2010GB003790, 2010. a
Headly, M. A. and Severinghaus, J. P.: A method to measure Kr∕N2 ratios in air
bubbles trapped in ice cores and its application in reconstructing past mean
ocean temperature, J. Geophys. Res.-Atmos., 112,
D19105, https://doi.org/10.1029/2006JD008317, 2007. a, b, c, d
Herguera, J., Herbert, T., Kashgarian, M., and Charles, C.: Intermediate and
deep water mass distribution in the Pacific during the Last Glacial Maximum
inferred from oxygen and carbon stable isotopes, Quaternary Sci. Rev.,
29, 1228–1245, 2010. a
Hesse, T., Butzin, M., Bickert, T., and Lohmann, G.: A model-data comparison of
δ13C in the glacial Atlantic Ocean, Paleoceanography, 26, PA3220, https://doi.org/10.1029/2010PA002085, 2011. a
Heuzé, C., Heywood, K. J., Stevens, D. P., and Ridley, J. K.: Southern
Ocean bottom water characteristics in CMIP5 models, Geophys. Res.
Lett., 40, 1409–1414, 2013. a
Hewitt, C. D., Broccoli, A., Crucifix, M., Gregory, J., Mitchell, J., and
Stouffer, R.: The effect of a large freshwater perturbation on the glacial
North Atlantic Ocean using a coupled general circulation model, J.
Clim., 19, 4436–4447, 2006. a
Jaccard, S. L. and Galbraith, E. D.: Large climate-driven changes of oceanic
oxygen concentrations during the last deglaciation, Nat. Geosci., 5,
151–159, 2012. a
Kohfeld, K., Graham, R., De Boer, A., Sime, L., Wolff, E., Le Quéré,
C., and Bopp, L.: Southern Hemisphere westerly wind changes during the Last
Glacial Maximum: paleo-data synthesis, Quaternary Sci. Rev., 68,
76–95, 2013. a
Kohfeld, K. E., Le Quéré, C., Harrison, S. P., and Anderson, R. F.:
Role of marine biology in glacial-interglacial CO2 cycles, Science, 308,
74–78, 2005. a
Kolowith, L. C., Ingall, E. D., and Benner, R.: Composition and cycling of
marine organic phosphorus, Limnol. Oceanogr., 46, 309–320, 2001. a
Kumar, N., Anderson, R., Mortlock, R., Froelich, P., Kubik, P.,
Dittrich-Hannen, B., and Suter, M.: Increased biological productivity and
export production in the glacial Southern Ocean, Nature, 378, 675–680, 1995. a
Kwon, E. Y., Primeau, F., and Sarmiento, J. L.: The impact of remineralization
depth on the air–sea carbon balance, Nat. Geosci., 2, 630–635, 2009. a
Laws, E. A., Falkowski, P. G., Smith Jr, W. O., Ducklow, H., and McCarthy,
J. J.: Temperature effects on export production in the open ocean, Global
Biogeochem. Cy., 14, 1231–1246, 2000. a
Le Quéré, C., Harrison, S. P., Colin Prentice, I., Buitenhuis, E. T.,
Aumont, O., Bopp, L., Claustre, H., Cotrim Da Cunha, L., Geider, R., Giraud,
X., Klaas, C., Kohfeld, K. E., Legendre, L.,
Manizza, M., Platt, T., Rivkin, R. B., Sathyendranath,
S., Uitz, J., Watson, A. J., and Wolf-Gladrow, D.: Ecosystem dynamics based on plankton functional types for global
ocean biogeochemistry models, Glob. Change Biol., 11, 2016–2040, 2005. a, b
Letscher, R. T. and Moore, J. K.: Preferential remineralization of dissolved
organic phosphorus and non-Redfield DOM dynamics in the global ocean: Impacts
on marine productivity, nitrogen fixation, and carbon export, Global
Biogeochem. Cy., 29, 325–340, 2015. a
Lüthi, D., Le Floch, M., Bereiter,
B., Blunier, T., Barnola, J.-M., Siegenthaler, U., Raynaud, D., Jouzel, J., Fischer,
H., Kawamura, K., and Stocker, T. F.: High-resolution carbon dioxide concentration
record 650,000–800,000 years before present, Nature, 453, 379–382,
https://doi.org/10.1038/nature06949, 2008. a
Lynch-Stieglitz, J., Curry, W. B., Slowey, N., and Schmidt, G. A.: The
overturning circulation of the glacial Atlantic, in: Reconstructing Ocean
History, Springer, 7–31, 1999. a
Mahowald, N. M., Muhs, D. R., Levis, S., Rasch, P. J., Yoshioka, M., Zender,
C. S., and Luo, C.: Change in atmospheric mineral aerosols in response to
climate: Last glacial period, preindustrial, modern, and doubled carbon
dioxide climates, J. Geophys. Res.-Atmos., 111,
D10202, https://doi.org/10.1029/2005JD006653, 2006. a, b, c, d
Marchal, O., Stocker, T. F., and Joos, F.: A latitude-depth,
circulation-biogeochemical ocean model for paleoclimate studies, Development
and sensitivities, Tellus B, 50, 290–316,
1998. a
Marchitto, T. M. and Broecker, W. S.: Deep water mass geometry in the glacial
Atlantic Ocean: A review of constraints from the paleonutrient proxy Cd∕Ca,
Geochem. Geophy. Geosy., 7, Q12003, https://doi.org/10.1029/2006GC001323, 2006. a, b
Marchitto, T. M., Lehman, S. J., Ortiz, J. D., Flückiger, J., and van Geen,
A.: Marine radiocarbon evidence for the mechanism of deglacial atmospheric
CO2 rise, Science, 316, 1456–1459, 2007. a
Marinov, I., Gnanadesikan, A., Sarmiento, J. L., Toggweiler, J. R., Follows,
M., and Mignone, B. K.: Impact of oceanic circulation on biological carbon
storage in the ocean and atmospheric pCO2, Global Biogeochem. Cy.,
22, GB3007, https://doi.org/10.1029/2007GB002958, 2008. a
Marsh, R., Müller, S. A., Yool, A., and Edwards, N. R.: Incorporation of the C-GOLDSTEIN efficient climate model into the GENIE framework: “eb_go_gs” configurations of GENIE, Geosci. Model Dev., 4, 957–992, https://doi.org/10.5194/gmd-4-957-2011, 2011. a
Matsumoto, K., Oba, T., Lynch-Stieglitz, J., and Yamamoto, H.: Interior
hydrography and circulation of the glacial Pacific Ocean, Quaternary Sci.
Rev., 21, 1693–1704, 2002. a
Mayr, C., Lücke, A., Wagner, S., Wissel, H., Ohlendorf, C., Haberzettl, T.,
Oehlerich, M., Schäbitz, F., Wille, M., Zhu, J., and Zolitschka, B.: Intensified
Southern Hemisphere Westerlies regulated atmospheric CO2 during the last
deglaciation, Geology, 41, 831–834, 2013. a
McInerney, F. A. and Wing, S. L.: The Paleocene-Eocene Thermal Maximum: A
perturbation of carbon cycle, climate, and biosphere with implications for
the future, Ann. Rev. Earth Planet. Sc., 39, 489–516,
2011. a
Menviel, L., Joos, F., and Ritz, S.: Simulating atmospheric CO2, 13C
and the marine carbon cycle during the Last Glacial–Interglacial cycle:
possible role for a deepening of the mean remineralization depth and an
increase in the oceanic nutrient inventory, Quaternary Sci. Rev., 56,
46–68, 2012. a, b, c
Mook, W.: 13C in atmospheric CO2, Neth. J. Sea Res., 20,
211–223, 1986. a
Moore, C., Mills, M., Arrigo, K., Berman-Frank, I., Bopp, L., Boyd, P.,
Galbraith, E., Geider, R., Guieu, C., Jaccard, S. L., Jickells, T. D.,
La Roche, J., Lenton, T. M., Mahowald, N. M., Maranon, E., Marinov, I., Moore, J.
K., Nakatsuka, T., Oschlies, A., Saito, M. A., Thingstad, T. F., Tsuda, A., and Ulloa,
O.: Processes and
patterns of oceanic nutrient limitation, Nat. Geosci., 6, 701–710,
2013. a, b
Moreno, A. R., Hagstrom, G. I., Primeau, F. W., Levin, S. A., and Martiny, A. C.: Marine phytoplankton stoichiometry mediates nonlinear interactions between nutrient supply, temperature, and atmospheric CO2, Biogeosciences, 15, 2761–2779, https://doi.org/10.5194/bg-15-2761-2018, 2018. a, b
Muglia, J., Skinner, L. C., and Schmittner, A.: Weak overturning circulation
and high Southern Ocean nutrient utilization maximized glacial ocean carbon,
Earth Planet. Sc. Lett., 496, 47–56, 2018. a
Ödalen, M., Nycander, J., Oliver, K. I. C., Brodeau, L., and Ridgwell, A.:
The influence of the ocean circulation state on ocean carbon storage and
CO2 drawdown potential in an Earth system model, Biogeosciences, 15,
1367–1393, https://doi.org/10.5194/bg-15-1367-2018, 2018. a, b, c, d, e, f, g, h, i
Paulmier, A., Kriest, I., and Oschlies, A.: Stoichiometries of remineralisation and denitrification in global biogeochemical ocean models, Biogeosciences, 6, 923–935, https://doi.org/10.5194/bg-6-923-2009, 2009. a
Peterson, C. D. and Lisiecki, L. E.: Deglacial carbon cycle changes observed in a compilation of 127 benthic δ13C time series (20–6 ka), Clim. Past, 14, 1229–1252, https://doi.org/10.5194/cp-14-1229-2018, 2018. a, b
Petit, J.-R., Jouzel, J., Raynaud, D., Barkov, N. I., Barnola, J.-M., Basile,
I., Bender, M., Chappellaz, J., Davis, M., Delaygue, G., Delmotte, M., Kotlyakov, V. M.,
Legrand, M., Lipenkov, V. Y., Lorius, C., Pépin, L., Ritz, C., Saltzman, E.,
and Stievenard, M.: Climate and
atmospheric history of the past 420,000 years from the Vostok ice core,
Antarctica, Nature, 399, 429–436, 1999. a
Rau, G. H., Riebesell, U., and Wolf-Gladrow, D.: CO2aq-dependent photosynthetic
13C fractionation in the ocean: A model versus measurements, Global
Biogeochem. Cy., 11, 267–278, 1997. a
Ridgwell, A., Hargreaves, J. C., Edwards, N. R., Annan, J. D., Lenton, T. M., Marsh, R., Yool, A., and Watson, A.: Marine geochemical data assimilation in an efficient Earth System Model of global biogeochemical cycling, Biogeosciences, 4, 87–104, https://doi.org/10.5194/bg-4-87-2007, 2007. a, b, c, d, e, f, g
Schmittner, A., Meissner, K., Eby, M., and Weaver, A.: Forcing of the deep
ocean circulation in simulations of the Last Glacial Maximum,
Paleoceanography, 17, 1015, https://doi.org/10.1029/2001PA000633, 2002. a
Sigman, D. M., Hain, M. P., and Haug, G. H.: The polar ocean and glacial cycles
in atmospheric CO2 concentration, Nature, 466, 47–55, 2010. a
Sime, L. C., Kohfeld, K. E., Le Quéré, C., Wolff, E. W., de Boer,
A. M., Graham, R. M., and Bopp, L.: Southern Hemisphere westerly wind changes
during the Last Glacial Maximum: model-data comparison, Quaternary Sci.
Rev., 64, 104–120, 2013. a
Sime, L. C., Hodgson, D., Bracegirdle, T. J., Allen, C., Perren, B., Roberts, S., and de Boer, A. M.: Sea ice led to poleward-shifted winds at the Last Glacial Maximum: the influence of state dependency on CMIP5 and PMIP3 models, Clim. Past, 12, 2241–2253, https://doi.org/10.5194/cp-12-2241-2016, 2016. a
Skinner, L., Fallon, S., Waelbroeck, C., Michel, E., and Barker, S.:
Ventilation of the deep Southern Ocean and deglacial CO2 rise, Science,
328, 1147–1151, 2010. a
Skinner, L., Primeau, F., Freeman, E., de la Fuente, M., Goodwin, P.,
Gottschalk, J., Huang, E., McCave, I., Noble, T., and Scrivner, A.:
Radiocarbon constraints on the glacial ocean circulation and its impact on
atmospheric CO2, Nat. Commun., 8, 16010, https://doi.org/10.1038/ncomms16010, 2017. a, b, c, d
Stephens, B. B. and Keeling, R. F.: The influence of Antarctic sea ice on
glacial–interglacial CO2 variations, Nature, 404, 171–174, 2000. a
Stocker, T.: Climate change 2013: the physical science basis: Working Group I
contribution to the Fifth assessment report of the Intergovernmental Panel on
Climate Change, Cambridge University Press, 2014. a
Tagliabue, A., Aumont, O., DeAth, R., Dunne, J. P., Dutkiewicz, S., Galbraith,
E., Misumi, K., Moore, J. K., Ridgwell, A., Sherman, E., Stock, C., Vichi, M., Völker, C., and
Yool, A.: How well do
global ocean biogeochemistry models simulate dissolved iron distributions?,
Global Biogeochem. Cy., 30, 149–174, 2016. a, b, c
Turner, S. K. and Ridgwell, A.: Development of a novel empirical framework for
interpreting geological carbon isotope excursions, with implications for the
rate of carbon injection across the PETM, Earth Planet. Sc.
Lett., 435, 1–13, 2016. a
Walin, G., Hieronymus, J., and Nycander, J.: Source-related variables for the
description of the oceanic carbon system, Geochem. Geophy.
Geosy., 15, 3675–3687, 2014. a
Wanninkhof, R.: Relationship between gas exchange and wind speed over the
ocean, J. Geophys. Res., 97, 7373–7382, 1992. a
Watson, A. J., Bakker, D., Ridgwell, A., Boyd, P., and Law, C.: Effect of iron
supply on Southern Ocean CO2 uptake and implications for glacial atmospheric
CO2, Nature, 407, 730–733, 2000. a
Zeebe, R. E. and Wolf-Gladrow, D. A.: CO2 in seawater: equilibrium,
kinetics, isotopes, 65, Gulf Professional Publishing, 2001. a
Short summary
In glacial periods, ocean uptake of carbon is likely a key player for achieving low atmospheric CO2. In climate models, ocean biological uptake of carbon (C) and phosphorus (P) are often assumed to occur in fixed proportions.
In this study, we allow the ratio of C : P to vary and simulate, to first approximation, the complex biological changes that occur in the ocean over long timescales. We show here that, for glacial–interglacial cycles, this complexity contributes to low atmospheric CO2.
In glacial periods, ocean uptake of carbon is likely a key player for achieving low atmospheric...
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