Arctic Research Directory

ID-17 :   CFES pacemaker hindcast experiment




CFES pacemaker hindcast experiment


Using CFES, we plan to perform pacemaker hindcast experiments, in which the simulated sea surface temperature is constrained to follow observed history in a specified region in the coupled model integration. The experiments are aimed at identifying inter-regional atmosphere-ocean-sea ice teleconnection and its predictability among tropics, mid-high latitudes, and Arctic region.

Computing Environment

Earth Simulator

Principal Investigator

Hiroyasu Hasumi
Atmosphere and Ocean Research Institute, The University of Tokyo

Funding Information Other Funding Details

Belmont Forum: InterDec

Data Information

Model Name
Abstract (Brief description of the experiment contents (initial conditions, boundary conditions, etc.))
(1) This is the dataset simulated by an ocean-atmosphere-sea ice coupled model at a resolution where the atmospheric component has a horizontal resolution of T119 spectral truncation (equivalently 100-km grid intervals) with 48 vertical sigma levels and the ocean component has 0.5º latitude–longitude grid intervals with 54 z-coordinate levels. The dataset consists of two experiments: (1) control experiment (CFES-CNTL run) and (2) tropical SST pacemaker experiment (CFES-TOGA run). (2) The CFES-CNTL run is a 300-year control integration with a fixed radiative forcing and no prescribed boundary forcing. The initial conditions are temperature and salinity fields with no motion for the ocean component, taken from climatological January mean fields of World Ocean Atlas 1998 whereas those for AFES are the climatological atmospheric fields for 0000 UTC 1 January based on the 40-yr European Centre for Medium-Range Weather Forecasts (ECMWF) Re-Analysis (ERA-40). Greenhouse gas concentrations are set at present-day values. (3) The CFES-TOGA run is a partially-constrained coupled integration where simulated SST is nudged towards observed SST based on OISST in entire tropics (25ºS-25ºN including 2º linear buffer region) for the period 1982-2013. The initial conditions are taken from the CFES-CNTL at January 1 in 10 different years for 10-member ensemble simulations. Greenhouse gas concentrations are set at present-day values. (4) In the CFES-TOGA run, simulated oceanic and atmospheric fields freely evolve outside of the tropical region where the model is forced to follow the observed history of SST, an experiment suitable to examine remote influences of tropical variability into higher latitudes including the Arctic region. Meanwhile, the CFES-CNTL run provides a measure of internal variability generated without any prescribed tropical boundary forcing. (4) Total size of this dataset is 35 TB. (5) Grid Information Dimension Size (slice number of the dimension) row: atmosphere 360, ocean 720 column: atmosphere 180, ocean 360 vertical: atmosphere 24, ocean 54 Resolution Unit row: atmosphere 1.0 (deg), ocean 0.5 (deg) column: atmosphere T119 gaussian grid (deg), ocean 0.5 (deg) vertical: atmosphere 1000, 925, 850, 700, 600, 500, 400, 300, 250, 200, 150, 100, 70, 50, 30, 20, 10, 7, 5, 3, 2, 1, 0.4, 0.1 (hPa)
Temporal Extent
Begin Date1982-01-01
End Date2013-12-31
Temporal Characteristics6-hourly for the atmopheric variables and SST. Monthly for other oceanic variables.
Geographic Bounding Box
North bound latitude90.0
West bound longitude0.0
Eastbound longitude360.0
South bound latitude-90.0


RollContact PersonNameBunmei TaguchiAffiliationRCAST/ University of
Data Registration
07:46 on Tue July 5, 2016
Last Update
04:34 on Fri July 5, 2019