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Title: Sensitivity to Glacial Forcing in the CCSM4

Journal Article · · Journal of Climate
 [1];  [1];  [1];  [1]
  1. National Center for Atmospheric Research, Boulder, CO (United States)

Findings are introduced from the Community Climate System Model, version 4 (CCSM4), simulation of the Last Glacial Maximum (LGM) from phase 5 of the Coupled Model Intercomparison Project (CMIP5) at the standard 1° resolution, the same resolution as the majority of the CCSM4 CMIP5 long-term simulations for the historical and future projection scenarios. The forcings and boundary conditions for this simulation follow the protocols of the Paleoclimate Modeling Intercomparison Project, version 3 (PMIP3). Two additional CCSM4 CO2 sensitivity simulations, in which the concentrations are abruptly changed at the start of the simulation to the low 185 ppm LGM concentrations (LGMCO2) and to a quadrupling of the preindustrial concentration (4×CO2), are also analyzed. For the full LGM simulation, the estimated equilibrium cooling of the global mean annual surface temperature is 5.5°C with an estimated radiative forcing of -6.2 W m-2. The radiative forcing includes the effects of the reduced LGM greenhouse gases, ice sheets, continental distribution with sea level lowered by approximately 120 m from the present, and orbital parameters, but not changes to atmospheric aerosols or vegetation biogeography. The LGM simulation has an equilibrium climate sensitivity (ECS) of 3.1(±0.3)°C, comparable to the CCSM4 4×CO2 result. The LGMCO2 simulation shows a greater ECS of 4.2°C. Other responses found at the LGM in CCSM4 include a global precipitation rate decrease at a rate of ~2% °C-1, similar to climate change simulations in the Intergovernmental Panel on Climate Change Fourth Assessment Report (IPCC AR4); a strengthening of the Atlantic meridional overturning circulation (AMOC) with a shoaling of North Atlantic Deep Water and a filling of the deep basin up to sill depth with Antarctic Bottom Water; and an enhanced seasonal cycle accompanied by reduced ENSO variability in the eastern Pacific Ocean’s SSTs.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); National Science Foundation (NSF)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1565085
Journal Information:
Journal of Climate, Vol. 26, Issue 6; ISSN 0894-8755
Publisher:
American Meteorological SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 134 works
Citation information provided by
Web of Science

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Cited By (53)

The PMIP4 contribution to CMIP6 – Part 3: The last millennium, scientific objective, and experimental design for the PMIP4 past1000 simulations journal January 2017
Warm summers during the Younger Dryas cold reversal journal April 2018
The effect of greenhouse gas concentrations and ice sheets on the glacial AMOC in a coupled climate model journal January 2016
Does Antarctic glaciation cool the world? journal January 2013
What can Palaeoclimate Modelling do for you? journal April 2019
Ice-sheet configuration in the CMIP5/PMIP3 Last Glacial Maximum experiments journal January 2015
Connecting Antarctic sea ice to deep-ocean circulation in modern and glacial climate simulations: SEA ICE AND GLACIAL AMOC journal June 2017
The tropical lapse rate steepened during the Last Glacial Maximum journal January 2017
Simulation of climate, ice sheets and CO2 evolution during the last four glacial cycles with an Earth system model of intermediate complexity journal January 2017
Interactive ocean bathymetry and coastlines for simulating the last deglaciation with the Max Planck Institute Earth System Model (MPI-ESM-v1.2) journal June 2018
The PMIP4 contribution to CMIP6 – Part 4: Scientific objectives and experimental design of the PMIP4-CMIP6 Last Glacial Maximum experiments and PMIP4 sensitivity experiments journal January 2017
African climate response to orbital and glacial forcing in 140,000-y simulation with implications for early modern human environments journal January 2020
A tale of four bears: Environmental signal on the phylogeographical patterns within the extant Ursus species journal December 2019
North Pacific Paleotemperature and Paleoproductivity Reconstructions Based on Diatom Species journal July 2018
The dependence of equilibrium climate sensitivity on climate state: Applications to studies of climates colder than present: CLIMATE SENSITIVITY AND CLIMATE STATE journal July 2013
Coupled climate–carbon cycle simulation of the Last Glacial Maximum atmospheric CO2 decrease using a large ensemble of modern plausible parameter sets journal January 2019
Concealed truth: Modeling reveals unique Quaternary distribution dynamics and refugia of four related endemic keystone Abies taxa on the Tibetan Plateau journal December 2019
Dynamical downscaling of tropical cyclones from CCSM4 simulations of the Last Glacial Maximum text January 2016
Modeling Dust Direct Radiative Feedbacks in East Asia During the Last Glacial Maximum journal March 2019
Does Southern Ocean Surface Forcing Shape the Global Ocean Overturning Circulation? journal March 2018
Glacial Inception in Marine Isotope Stage 19: An Orbital Analog for a Natural Holocene Climate journal July 2018
Impacts of surface boundary conditions on regional climate model simulations of European climate during the Last Glacial Maximum: Regional European Climate During the LGM journal May 2017
A Review of Paleo El Niño-Southern Oscillation journal March 2018
Radiative Effect of Mineral Dust on East Asian Summer Monsoon During the Last Glacial Maximum: Role of Snow‐Albedo Feedback journal October 2019
Past continental shelf evolution increased Antarctic ice sheet sensitivity to climatic conditions journal July 2018
Seasonal changes of the South American monsoon system during the Mid-Holocene in the CMIP5 simulations journal January 2020
In and out of glacial extremes by way of dust−climate feedbacks journal February 2018
The impact of the North American glacial topography on the evolution of the Eurasian ice sheet over the last glacial cycle journal January 2016
Is the Last Glacial Maximum a reverse analog for future hydroclimate changes in the Americas? journal August 2018
Numerical simulations of a kilometre-thick Arctic ice shelf consistent with ice grounding observations journal April 2018
Twelve thousand years of dust: the Holocene global dust cycle constrained by natural archives journal January 2015
The sensitivity of Northern Hemisphere ice sheets to atmospheric forcing during the last glacial cycle using PMIP3 models journal July 2019
Model evidence for a seasonal bias in Antarctic ice cores journal April 2018
Evolution of the large-scale atmospheric circulation in response to changing ice sheets over the last glacial cycle journal January 2014
The Stability of the AMOC During Heinrich Events Is Not Dependent on the AMOC Strength in an Intermediate Complexity Earth System Model Ensemble journal August 2019
Tabula rasa in the Patagonian Channels II : The cushion peat bog species Astelia pumila (Asteliaceae) and Donatia fascicularis (Stylidiaceae) survived the last glacial in south‐central Chile journal April 2019
Glacial changes in tropical climate amplified by the Indian Ocean journal December 2018
A spatiotemporal reconstruction of sea-surface temperatures in the North Atlantic during Dansgaard–Oeschger events 5–8 journal January 2018
Deglacial evolution of regional Antarctic climate and Southern Ocean conditions in transient climate simulations journal January 2019
The de-correlation of westerly winds and westerly-wind stress over the Southern Ocean during the Last Glacial Maximum journal February 2015
Responses of ocean circulation and carbon cycle to changes in the position of the Southern Hemisphere westerlies at Last Glacial Maximum journal December 2013
Reduced El Nino-Southern Oscillation during the Last Glacial Maximum journal January 2015
Evolution of the large-scale atmospheric circulation in response to changing ice sheets over the last glacial cycle journal January 2014
Deglacial evolution of regional Antarctic climate and Southern Ocean conditions in transient climate simulations posted_content June 2018
Does Antarctic glaciation cool the world? posted_content July 2012
Interactive ocean bathymetry and coastlines for simulating the last deglaciation with the Max Planck Institute Earth System Model (MPI-ESM-v1.2) journal January 2018
Ice-sheet configuration in the CMIP5/PMIP3 Last Glacial Maximum experiments journal January 2015
A spatiotemporal reconstruction of sea-surface temperatures in the North Atlantic during Dansgaard–Oeschger events 5–8 text January 2018
Impacts of surface boundary conditions on regional climate model simulations of European climate during the Last Glacial Maximum text January 2017
Coupled climate-carbon cycle simulation of the Last Glacial Maximum atmospheric CO2 decrease using a large ensemble of modern plausible parameter sets text January 2019
The PMIP4 contribution to CMIP6 - Part 3: The last millennium, scientific objective, and experimental design for the PMIP4 past1000 simulations text January 2017
The effect of greenhouse gas concentrations and ice sheets on the glacial AMOC in a coupled climate model posted_content April 2016
The PMIP4 contribution to CMIP6 – Part 3: The last millennium, scientific objective, and experimental design for the PMIP4 past1000 simulations text January 2017

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