Impact of ocean model resolution on CCSM climate simulations

Benjamin Kirtman, Cecilia Bitz, Frank Bryan, William Collins, John Dennis, Nathan Hearn, James L. Kinter, Richard Loft, Clement Rousset, Leo Siqueira, Cristiana Stan, Robert Tomas, Mariana Vertenstein

Research output: Contribution to journalArticle

107 Citations (Scopus)

Abstract

The current literature provides compelling evidence suggesting that an eddy-resolving (as opposed to eddy-permitting or eddy-parameterized) ocean component model will significantly impact the simulation of the large-scale climate, although this has not been fully tested to date in multi-decadal global coupled climate simulations. The purpose of this paper is to examine how resolved ocean fronts and eddies impact the simulation of large-scale climate. The model used for this study is the NCAR Community Climate System Model version 3. 5 (CCSM3. 5)-the forerunner to CCSM4. Two experiments are reported here. The control experiment is a 155-year present-day climate simulation using a 0. 5° atmosphere component (zonal resolution 0. 625 meridional resolution 0. 5°; land surface component at the same resolution) coupled to ocean and sea-ice components with zonal resolution of 1. 2° and meridional resolution varying from 0. 27° at the equator to 0. 54° in the mid-latitudes. The second simulation uses the same atmospheric and land-surface models coupled to eddy-resolving 0. 1° ocean and sea-ice component models. The simulations are compared in terms of how the representation of smaller scale features in the time mean ocean circulation and ocean eddies impact the mean and variable climate. In terms of the global mean surface temperature, the enhanced ocean resolution leads to a ubiquitous surface warming with a global mean surface temperature increase of about 0. 2 °C relative to the control. The warming is largest in the Arctic and regions of strong ocean fronts and ocean eddy activity (i. e., Southern Ocean, western boundary currents). The Arctic warming is associated with significant losses of sea-ice in the high-resolution simulation. The sea surface temperature gradients in the North Atlantic, in particular, are better resolved in the high-resolution model leading to significantly sharper temperature gradients and associated large-scale shifts in the rainfall. In the extra-tropics, the interannual temperature variability is increased with the resolved eddies, and a notable increases in the amplitude of the El Niño and the Southern Oscillation is also detected. Changes in global temperature anomaly teleconnections and local air-sea feedbacks are also documented and show large changes in ocean-atmosphere coupling. In particular, local air-sea feedbacks are significantly modified by the increased ocean resolution. In the high-resolution simulation in the extra-tropics there is compelling evidence of stronger forcing of the atmosphere by SST variability arising from ocean dynamics. This coupling is very weak or absent in the low-resolution model.

Original languageEnglish (US)
Pages (from-to)1303-1328
Number of pages26
JournalClimate Dynamics
Volume39
Issue number6
DOIs
StatePublished - Sep 2012

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eddy
climate
ocean
simulation
sea ice
warming
temperature gradient
land surface
surface temperature
sea surface temperature
atmosphere-ocean coupling
western boundary current
atmosphere
Southern Oscillation
teleconnection
air
temperature anomaly
experiment
rainfall
temperature

Keywords

  • Climate modeling
  • Climate variability
  • Ocean Eddies

ASJC Scopus subject areas

  • Atmospheric Science

Cite this

Kirtman, B., Bitz, C., Bryan, F., Collins, W., Dennis, J., Hearn, N., ... Vertenstein, M. (2012). Impact of ocean model resolution on CCSM climate simulations. Climate Dynamics, 39(6), 1303-1328. https://doi.org/10.1007/s00382-012-1500-3

Impact of ocean model resolution on CCSM climate simulations. / Kirtman, Benjamin; Bitz, Cecilia; Bryan, Frank; Collins, William; Dennis, John; Hearn, Nathan; Kinter, James L.; Loft, Richard; Rousset, Clement; Siqueira, Leo; Stan, Cristiana; Tomas, Robert; Vertenstein, Mariana.

In: Climate Dynamics, Vol. 39, No. 6, 09.2012, p. 1303-1328.

Research output: Contribution to journalArticle

Kirtman, B, Bitz, C, Bryan, F, Collins, W, Dennis, J, Hearn, N, Kinter, JL, Loft, R, Rousset, C, Siqueira, L, Stan, C, Tomas, R & Vertenstein, M 2012, 'Impact of ocean model resolution on CCSM climate simulations', Climate Dynamics, vol. 39, no. 6, pp. 1303-1328. https://doi.org/10.1007/s00382-012-1500-3
Kirtman B, Bitz C, Bryan F, Collins W, Dennis J, Hearn N et al. Impact of ocean model resolution on CCSM climate simulations. Climate Dynamics. 2012 Sep;39(6):1303-1328. https://doi.org/10.1007/s00382-012-1500-3
Kirtman, Benjamin ; Bitz, Cecilia ; Bryan, Frank ; Collins, William ; Dennis, John ; Hearn, Nathan ; Kinter, James L. ; Loft, Richard ; Rousset, Clement ; Siqueira, Leo ; Stan, Cristiana ; Tomas, Robert ; Vertenstein, Mariana. / Impact of ocean model resolution on CCSM climate simulations. In: Climate Dynamics. 2012 ; Vol. 39, No. 6. pp. 1303-1328.
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