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  • 1
    Publication Date: 2024-04-20
    Description: Data are from a series of time-slice simulations using the Community Earth System Model (CESM) v1.2.2 run on the HLRN supercomputing systems. This configuration uses a coupled atmosphere, ocean, land, and sea-ice model to simulate many facets of climate at relatively high resolution (approx. 1° in the ocean and sea ice, 1.9° latitude by 2.5° longitude in the land and atmosphere). A baseline preindustrial control simulation was integrated under constant 1850 solar and greenhouse gas conditions for 2500 years. Time slice simulations corresponding to key insolation minima and maxima during the Marine Isotope Stage 11 (MIS-11) interglacial were branched from year 1500 of this simulation and run for 1000 additional years under the new forcing conditions. Only orbital parameters (longitude of perihelion, obliquity, and eccentricity) and key greenhouse gases (carbon dioxide, methane, and nitrous oxide) were altered between simulations. The data here represent a selection of calculated output fields including 2m air temperatures, total (convective + non-convective) precipitation, total (stationary + transient) eddy heat flux, and wind velocity at the 300hPa atmospheric pressure level. These fields were used to create plots in Crow et al. (2022), a manuscript submitted to Climate of the Past.
    Keywords: ArcTrain; CESM; eddy heat flux; Greenland climate; MIS-11; North African monsoon; North Atlantic jet stream; Processes and impacts of climate change in the North Atlantic Ocean and the Canadian Arctic
    Type: Dataset
    Format: application/zip, 52.1 MBytes
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  • 2
    Publication Date: 2017-03-01
    Description: Wave activity in the Southern Hemisphere extratropical atmosphere exhibits robust periodicity on time scales of ~20–25 days. Previous studies have demonstrated the robustness of the periodicity in hemispheric averages of various eddy quantities. Here the authors explore the signature of the periodicity on regional spatial scales. Intraseasonal periodicity in the Southern Hemisphere circulation derives from out-of-phase anomalies in wave activity that form in association with extratropical wave packets as they propagate to the east. In the upper troposphere, the out-of-phase anomalies in wave activity form not along the path of extratropical wave packets, but in their wake. The out-of-phase anomalies in wave activity give rise to periodicity not only on hemispheric scales, but also on synoptic scales when the circulation is sampled along an eastward path between ~5 and 15 m s−1. It is argued that 1) periodicity in extratropical wave activity derives from two-way interactions between the heat fluxes and baroclinicity in the lower troposphere and 2) the unique longitude–time structure of the periodicity in upper-tropospheric wave activity derives from the contrasting eastward speeds of the source of the periodicity in the lower troposphere (~10 m s−1) and wave packets in the upper troposphere (~25 m s−1).
    Print ISSN: 0022-4928
    Electronic ISSN: 1520-0469
    Topics: Geography , Geosciences , Physics
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