The PMIP4 contribution to CMIP6 - Part 3: The last millennium, scientific objective, and experimental design for the PMIP4 past 1000 simulations

The pre-industrial millennium is among the periods selected by the Paleoclimate Model Intercomparison Project (PMIP) for experiments contributing to the sixth phase of the Coupled Model Intercomparison Project (CMIP6) and the fourth phase of the PMIP (PMIP4). The past1000 transient simulations serve to investigate the response to (mainly) natural forcing under background conditions not too different from today, and to discriminate between forced and internally generated variability on interannual to centennial timescales. This paper describes the motivation and the experimental set-ups for the PMIP4-CMIP6 past1000 simulations, and discusses the forcing agents orbital, solar, volcanic, and land use/land cover changes, and variations in greenhouse gas concentrations. The past1000 simulations covering the pre-industrial millennium from 850 Common Era (CE) to 1849 CE have to be complemented by historical simulations (1850 to 2014 CE) following the CMIP6 protocol. The external forcings for the past1000 experiments have been adapted to provide a seamless transition across these time periods. Protocols for the past1000 simulations have been divided into three tiers. A default forcing data set has been defined for the Tier 1 (the CMIP6 past1000) experiment. However, the PMIP community has maintained the flexibility to conduct coordinated sensitivity experiments to explore uncertainty in forcing reconstructions as well as parameter uncertainty in dedicated Tier 2 simulations. Additional experiments (Tier 3) are defined to foster collaborative model experiments focusing on the early instrumental period and to extend the temporal range and the scope of the simulations. This paper outlines current and future research foci and common analyses for collaborative work between the PMIP and the observational communities (reconstructions, instrumental data).

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Author Jungclaus, Johann H.
Bard, Edouard
Baroni, Mélanie
Braconnot, Pascale
Cao, Jian
Chini, Louise P.
Egorova, Tania
Evans, Michael
González-Rouco, J. Fidel
Goosse, Hugues
Hurtt, George C.
Joos, Fortunat
Kaplan, Jed O.
Khodri, Myriam
Klein Goldewijk, Kees
Krivova, Natalie
LeGrande, Allegra N.
Lorenz, Stephan J.
Luterbacher, Jürg
Man, Wenmin
Maycock, Amanda C.
Meinshausen, Malte
Moberg, Anders
Muscheler, Raimund
Nehrbass-Ahles, Christoph
Otto-Bliesner, Bette I.
Phipps, Steven J.
Pongratz, Julia
Rozanov, Eugene
Schmidt, Gavin A.
Schmidt, Hauke
Schmutz, Werner
Schurer, Andrew
Shapiro, Alexander I.
Sigl, Michael
Smerdon, Jason E.
Solanki, Sami K.
Timmreck, Claudia
Toohey, Matthew
Usoskin, Ilya G.
Wagner, Sebastian
Wu, Chi-Ju
Yeo, Kok Leng
Zanchettin, Davide
Zhang, Qiong
Zorita, Eduardo
Publisher UCAR/NCAR - Library
Publication Date 2017-11-07T00:00:00
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Topic Category geoscientificInformation
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Metadata Date 2023-08-18T19:16:47.420621
Metadata Record Identifier edu.ucar.opensky::articles:21168
Metadata Language eng; USA
Suggested Citation Jungclaus, Johann H., Bard, Edouard, Baroni, Mélanie, Braconnot, Pascale, Cao, Jian, Chini, Louise P., Egorova, Tania, Evans, Michael, González-Rouco, J. Fidel, Goosse, Hugues, Hurtt, George C., Joos, Fortunat, Kaplan, Jed O., Khodri, Myriam, Klein Goldewijk, Kees, Krivova, Natalie, LeGrande, Allegra N., Lorenz, Stephan J., Luterbacher, Jürg, Man, Wenmin, Maycock, Amanda C., Meinshausen, Malte, Moberg, Anders, Muscheler, Raimund, Nehrbass-Ahles, Christoph, Otto-Bliesner, Bette I., Phipps, Steven J., Pongratz, Julia, Rozanov, Eugene, Schmidt, Gavin A., Schmidt, Hauke, Schmutz, Werner, Schurer, Andrew, Shapiro, Alexander I., Sigl, Michael, Smerdon, Jason E., Solanki, Sami K., Timmreck, Claudia, Toohey, Matthew, Usoskin, Ilya G., Wagner, Sebastian, Wu, Chi-Ju, Yeo, Kok Leng, Zanchettin, Davide, Zhang, Qiong, Zorita, Eduardo. (2017). The PMIP4 contribution to CMIP6 - Part 3: The last millennium, scientific objective, and experimental design for the PMIP4 past 1000 simulations. UCAR/NCAR - Library. http://n2t.net/ark:/85065/d77d2xqs. Accessed 03 October 2024.

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