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Climate and carbon cycle changes from 1850 to 2100 in MPI-ESM simulations for the Coupled Model Intercomparison Project phase 5

Giorgetta, M. A., Jungclaus, J., Reick, C. H., Legutke, S., Bader, M., Brovkin, V., Crueger, T., Esch, M., Fieg, K., Glushak, K., Gayler, V., Haak, H., Hollweg, H.-D., Ilyina, T., Kinne, S., Kornblueh, L., Matei, D., Mauritsen, T., Mikolajewicz, U., Mueller, W. , Notz,, D., Pithan, F., Raddatz, T., Rast, S., Redler, R., Roeckner, E., Schmidt,, H., Schnur,, R., Segschneider, J., Six, K. D., Stockhause, M., Timmreck, C., Wegner, J., Widmann, H., Wieners, K.-H., Claussen, M., Marotzke, J. and Stevens, B. (2013) Climate and carbon cycle changes from 1850 to 2100 in MPI-ESM simulations for the Coupled Model Intercomparison Project phase 5. Journal of Advances in Modeling Earth Systems, 5 (3). pp. 572-597. ISSN 1942-2466

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The new Max-Planck-Institute Earth System Model (MPI-ESM) is used in the Coupled Model Intercomparison Project phase 5 (CMIP5) in a series of climate change experiments for either idealized CO2-only forcing or forcings based on observations and the Representative Concentration Pathway (RCP) scenarios. The paper gives an overview of the model configurations, experiments related forcings, and initialization procedures and presents results for the simulated changes in climate and carbon cycle. It is found that the climate feedback depends on the global warming and possibly the forcing history. The global warming from climatological 1850 conditions to 2080–2100 ranges from 1.5°C under the RCP2.6 scenario to 4.4°C under the RCP8.5 scenario. Over this range, the patterns of temperature and precipitation change are nearly independent of the global warming. The model shows a tendency to reduce the ocean heat uptake efficiency toward a warmer climate, and hence acceleration in warming in the later years. The precipitation sensitivity can be as high as 2.5% K−1 if the CO2 concentration is constant, or as small as 1.6% K−1, if the CO2 concentration is increasing. The oceanic uptake of anthropogenic carbon increases over time in all scenarios, being smallest in the experiment forced by RCP2.6 and largest in that for RCP8.5. The land also serves as a net carbon sink in all scenarios, predominantly in boreal regions. The strong tropical carbon sources found in the RCP2.6 and RCP8.5 experiments are almost absent in the RCP4.5 experiment, which can be explained by reforestation in the RCP4.5 scenario.

Item Type:Article
Divisions:No Reading authors. Back catalogue items
ID Code:39338
Additional Information:other authors:- Helmuth Haak, Heinz-Dieter Hollweg, Tatiana Ilyina, Stefan Kinne, Luis Kornblueh, Daniela Matei, Thorsten Mauritsen, Uwe Mikolajewicz, Wolfgang Mueller, Dirk Notz, Felix Pithan, Thomas Raddatz, Sebastian Rast, Rene Redler, Erich Roeckner, Hauke Schmidt, Reiner Schnur, Joachim Segschneider, Katharina D. Six, Martina Stockhause, Claudia Timmreck, Jörg Wegner, Heinrich Widmann, Karl-H. Wieners, Martin Claussen, Jochem Marotzke, Bjorn Stevens

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