Completed projects
C-iTRACE: Isotope-enabled paleo ocean modeling for the deglacial
In this NSF-funded project, we are using recenty developed carbon, water, neodynium, and Pa/Th isotopes within the CESM ocean model to assess the simulated deglacial climate evolution against proxy records and isotope observations. Collaborators include Zhengyu Liu (The Ohio State University), Sifan Gu (Shanghai Jiao Tong University), Bette Otto-Blienser (NCAR),ÌýHannah ZanowskiÌý(CU), andÌýSara Reinelt (CU). Project website:Ìý. CiTRACE output is available atÌý.
Assessing the simulated Arctic freshwater system in CMIP5 Models, the CESM Large Ensemble, and forced simulations
In this NSF-funded project, we worked to assess various aspects of the the Arctic freshwater budget, including simulated by CMIP6 climate models (), changes in freshwater pathways on various timescales (,Ìý), and the influence of internal variability on the simulated Arctic freshwater budget () and Arctic sea ice (), as well as on the predictability of an ice-free Arctic (,Ìý). Collaborators on this project include Marika Holland (NCAR), Bruno Tremblay (Columbia University & McGill University),ÌýRory Laiho (CU),ÌýPatricia DeRepentignyÌý(CU), andÌýHannah ZanowskiÌý(CU). Timeseries of the Arctic freshwater terms from the CESM Large Ensemble and the CESM Low warming ensemble are archived at the NSF Arctic Dater Center () and CMIP6 model Arctic freshwater terms are also archived there ().
Understanding Arctic melt season changes through modeling
In this project funded through a NSF-GRF and NASA FINESST grant to Abigail Smith, we contributed to a better understanding the melt season changes in the Arctic Ocean. The first part of this project was focused on assessing the impact of definition choices and internal variability on melt season charcteristics. This work is published asÌý. A paper on useing melt season characteristics to provide an improved assessment of sea ice simulations from CMIP6 models in collaboration with M. Wang (¿ªÐÄ¹í´«Ã½) was published asÌý. As final step, Abigail Smith adapted a passive microwave sea ice emulator for the use in earth system models for melt onset in the CESM2, to better compare sea ice simulatons of melt onset from earth system models with satellite retrievals. This work was done in collaboration with Dirk Notz and Clara Burgard from the Max Plank Institute of Meoerology in Hamburg and is currently in prepartion for publication.
Climate of the past 2000 years: past2k CESM simulation
In this project, we performed a transient CESM model simulation for the last 2000 years, called past2k. In the analysis, we have focussed on the assessment of the drivers of the asymetric cooling rates of the Atlantic and Pacific Arctic. Collaborators on this project are Y. Zhong (University of Wisconsin Madison), G. Miller (INSTAAR) and A. Geirsdottir (Univ. of Iceland). Results are published inÌý.Ìý Forcing data for the past2k simulation is published asÌýZhong et al. (2018). Outout from the past2k simulation is freely available at:Ìý