Idealized single-forcing GCM simulations with NCAR CESM

• Main Authors: Erb, Michael, Jackson, Charles, DiNezio, Pedro
• Format: Other/Unknown Material
• Language: English
• Published: Zenodo 2018
• Subjects: Climate; Modeling; GCM; NCAR; CESM; Paleoclimate; Milankovitch; Obliquity; Precession; Eccentricity; CO2; Ice sheets; Single-forcing; Fingerprint; Sea ice
• Online Access: https://doi.org/10.5281/zenodo.1194490

This repository contains a set of single-forcing general circulation model (GCM) simulations run with the National Center for Atmospheric Research (NCAR) Community Earth System Model version 1.2 (CESM1.2). In each of these equilibrium simulations, one climate forcing was altered while all others were held constant at preindustrial levels, modeling the climate response to individual climate forcings. Simulations were run for obliquity (low and high obliquity), precession (four phases of the precession cycle with high eccentricity, and one simulation with eccentricity set to zero), half CO 2 , and LGM-sized ice sheets. The values chosen for the orbital simulations represent the extreme values of the past 900 thousand years. Simulations were run for at least 500 years, and forcings do not change from year to year. The uploaded files are 100 year (or longer) monthly climatologies. For most simulations, variables are presented for the atmosphere (atm), sea ice (cice), land (clm2), and river runoff (rtm). For the ice sheets simulation and its corresponding preindustrial simulation (0ka), only atmospheric output is presented; to inquire about other fields for those simulations, please contact Pedro DiNezio at [e-mail]. Ocean files are not currently available; please contact Michael Erb at [e-mail] if you are interested in those results. === FORCINGS === Preindustrial climate forcings for the 0ka_0urb simulation were set to the following values: - Obliquity: 23.44107° - Longitude of perihelion: 102.7242° - Eccentricity: 0.01670772 - CO 2 : 284.7 ppm - Ice sheets: 0 ka BP The remaining simulations explore the climate response to a change in one of these forcings, with all other forcings set to preindustrial levels. Forcings are specified as follows: - lo_obliq and hi_obliq: Obliquity is set to 22.079° or 24.480°, respectively. - 0_AEQ, 90_WSOL, 180_VEQ, and 270_SSOL: Perihelion occurs at the NH autumnal equinox, winter solstice, vernal equinox, or summer solstice, respectively, with eccentricity ...