Articles | Volume 12, issue 9
https://doi.org/10.5194/gmd-12-3889-2019
https://doi.org/10.5194/gmd-12-3889-2019
Model evaluation paper
 | 
03 Sep 2019
Model evaluation paper |  | 03 Sep 2019

Paleo calendar-effect adjustments in time-slice and transient climate-model simulations (PaleoCalAdjust v1.0): impact and strategies for data analysis

Patrick J. Bartlein and Sarah L. Shafer

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Cited articles

Bartlein, P. J. and Shafer, S. L.: PaleoCalAdjust v1.0: Paleo calendar-effect adjustments in time-slice and transient climate-model simulations, Zenodo, https://doi.org/10.5281/zenodo.1478824, 2019. 
Berger, A. L.: Long-term variations of daily insolation and Quaternary climatic changes, J. Atmos. Sci., 35, 2362–2367, https://doi.org/10.1175/1520-0469(1978)035<2362:LTVODI>2.0.CO;2, 1978. 
Caley, T., Roche, D. M., and Renssen, H.: Orbital Asian summer monsoon dynamics revealed using an isotope-enabled global climate model, Nat. Commun., 5, 5371, https://doi.org/10.1038/ncomms6371, 2014. 
Chen, G.-S., Kutzbach, J. E., Gallimore, R., and Liu, Z.: Calendar effect on phase study in paleoclimate transient simulation with orbital forcing, Clim. Dynam., 37, 1949–1960, https://doi.org/10.1007/s00382-010-0944-6, 2011. 
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Short summary
One of the consequences of changes in the shape of Earth's orbit over time (in addition to pacing glacial–interglacial variations) is changes in the length of months or seasons. The well-known paleo calendar effect that results can produce patterns in comparisons of present-day and paleoclimate model simulations that could be mistaken for real climate changes. We illustrate the source of those patterns and describe an approach and set of programs for routinely adjusting for the effect.