Skip to main content

Simulated Climate and Climate Change in the GFDL CM2.5 High-Resolution Coupled Climate Model

Author(s): Delworth, Thomas L; Rosati, Anthony; Anderson, Whit; Adcroft, Alistair J; Balaji, Venkatramani; et al

To refer to this page use:
Abstract: The authors present results for simulated climate and climate change from a newly developed high-resolution global climate model [Geophysical Fluid Dynamics Laboratory Climate Model version 2.5 (GFDL CM2.5)]. The GFDL CM2.5 has an atmospheric resolution of approximately 50 km in the horizontal, with 32 vertical levels. The horizontal resolution in the ocean ranges from 28 km in the tropics to 8 km at high latitudes, with 50 vertical levels. This resolution allows the explicit simulation of some mesoscale eddies in the ocean, particularly at lower latitudes. Analyses are presented based on the output of a 280-yr control simulation; also presented are results based on a 140-yr simulation in which atmospheric CO2 increases at 1% yr−1 until doubling after 70 yr. Results are compared to GFDL CM2.1, which has somewhat similar physics but a coarser resolution. The simulated climate in CM2.5 shows marked improvement over many regions, especially the tropics, including a reduction in the double ITCZ and an improved simulation of ENSO. Regional precipitation features are much improved. The Indian monsoon and Amazonian rainfall are also substantially more realistic in CM2.5. The response of CM2.5 to a doubling of atmospheric CO2 has many features in common with CM2.1, with some notable differences. For example, rainfall changes over the Mediterranean appear to be tightly linked to topography in CM2.5, in contrast to CM2.1 where the response is more spatially homogeneous. In addition, in CM2.5 the near-surface ocean warms substantially in the high latitudes of the Southern Ocean, in contrast to simulations using CM2.1.
Publication Date: 15-Apr-2012
Citation: Delworth, Thomas L., Anthony Rosati, Whit Anderson, Alistair J. Adcroft, Venkatramani Balaji, Rusty Benson, Keith Dixon et al. "Simulated climate and climate change in the GFDL CM2. 5 high-resolution coupled climate model." Journal of Climate 25, no. 8 (2012): 2755-2781. doi:10.1175/JCLI-D-11-00316.1.
DOI: doi:10.1175/JCLI-D-11-00316.1
ISSN: 0894-8755
EISSN: 1520-0442
Pages: 2755 - 2781
Type of Material: Journal Article
Journal/Proceeding Title: Journal of Climate
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

Items in OAR@Princeton are protected by copyright, with all rights reserved, unless otherwise indicated.