C-iTRACE
C-iTRACE: an isotope-enabled ocean-only deglacial simulation
C-iTRACE is a coarse resolution (3˚), ocean-only simulation run from the LGM (22ka) to present day using iPOP2, the isotope-enabled ocean component of the CESM1. This simulation was developed in order to better understand ocean circulation and tracer evolution during the last deglaciation, and it does so by providing a direct comparison to paleo-ocean proxy records via the inclusion of isotope tracers and active biogeochemistry. C-iTRACE is forced with monthly heat, freshwater, and momentum fluxes from TraCE-21Ka. Simulated tracers include carbon isotopes (D14C, d13C; Jahn et al. 2015), oxygen isotopes (d18O; Zhang et al. 2017), Neodymium (Gu et al. 2019, JAMES) and Pa/Th (Gu and Liu 2017).
Further details about the C-iTRACE simulation can be found in the following publications:
Gu et al. 2019 (Paleoceanography and Paleoclimatology), which describes the C-iTRACE physical forcing and the d18O forcing
Gu et al. 2020, which describes all C-iTRACE isotope forcings but only at the LGM
Gu et al., 2021, which describes the transient forcing of carbon isotopes and the transient dust forcing
Zanowski et al. 2022, which describes the CiTRACE spin-up for various tracers
The C-iTRACE project was carried out at the University of Colorado Boulder, University of Wisconsin-Madison and the Ohio State university. This website was created as part of the University of Colorado Boulder effort.
References:
Gu, S. and Liu, Z. (2017): 231Pa and 230Th in the ocean model of the Community Earth System Model (CESM1.3), Geosci. Model Dev., 10, 4723–4742, https://doi.org/10.5194/gmd-10-4723-2017.
Gu, S., Liu, Z., Jahn, A., Rempfer, J., Zhang, J., & Joos, F. (2019). Modeling Neodymium Isotopes in the Ocean Component of the Community Earth System Model (CESM1). Journal of Advances in Modeling Earth Systems, 11(3), 624–640. https://doi.org/10.1029/2018ms001538
Gu, S., Liu, Z., Lynch‐Stieglitz, J., Jahn, A., Zhang, J., Lindsay, K., & Wu, L. (2019). Assessing the Ability of Zonal d18O Contrast in Benthic Foraminifera to Reconstruct Deglacial Evolution of Atlantic Meridional Overturning Circulation. Paleoceanography and Paleoclimatology, 34(5), 800–812. https://doi.org/10.1029/2019PA003564
Gu, S., Liu, Z., Oppo, D. W., Lynch-Stieglitz, J., Jahn, A., Zhang, J., & Wu, L. (2020). Assessing the potential capability of reconstructing glacial Atlantic water masses and AMOC using multiple proxies in CESM. Earth and Planetary Science Letters, 541, 116294. https://doi.org/10.1016/j.epsl.2020.116294
Gu, S., Z. Liu, D. W. Oppo, J. Lynch-Stieglitz, A. Jahn, J. Zhang, K. Lindsay & L. Wu (2021), Remineralization dominating the δ13C decrease in the mid-depth Atlantic during the last deglaciation, Earth and Planetary Science Letters, 571, 117106, https://doi.org/10.1016/j.epsl.2021.117106
Jahn, A., Lindsay, K., Giraud, X., Gruber, N., Otto-Bliesner, B. L., Liu, Z., and Brady, E. C. (2015): Carbon isotopes in the ocean model of the Community Earth System Model (CESM1), Geosci. Model Dev., 8, 2419–2434, https://doi.org/10.5194/gmd-8-2419-2015
Zanowski, H., Jahn, A., Gu, S., Liu, Z., & Marchitto, T. M. (2022). Decomposition of deglacial Pacific radiocarbon age controls using an isotope-enabled ocean model. Paleoceanography and Paleoclimatology, 37, e2021PA004363. https://doi.org/10.1029/2021PA004363
Zhang, J., Liu, Z., Brady, E. C., Oppo, D. W., Clark, P. U., Jahn, A., Marcott, S. A., & Lindsay, K. (2017). Asynchronous warming and δ18O evolution of deep Atlantic water masses during the last deglaciation. Proceedings of the National Academy of Sciences, 114(42), 11075–11080. https://doi.org/10.1073/pnas.1704512114