Publication Data

From the Publication:

Clement, A., K. Bellomo, L. N. Murphy, M. A. Cane, T. Mauritsen, G. Radel, B. Stevens, 2015: The Atlantic Multidecadal Oscillation without a role for ocean circulation. Science, 350, 320-324. [pdf] [suppl]

All of the CMIP3 slab-ocean and fully coupled pre-industrial simulations can be found here: We supplement the CMIP3 models with fully coupled and slab-ocean model pre-industrial simulations of the Community Atmosphere Model version 4 (CAM4) and of MPI-ESM-LR. In the CAM4 slab ocean circulation, the mixed layer depth is spatially dependent but temporally constant and is derived from the annual-mean conditions of a preindustrial control simulation of the fully coupled model. The original simulations of CAM4-slab ocean were published in Okumura 2013 (Origins of tropical Pacific decadal variability: Role of stochastic atmospheric forcing from the South Pacific. J. Climate, 26, 9791-9796.). The AMO index (detrended, averaged SST in the Atlantic ocean 0° to 60°N, 80°W to 0°) for these simulations can be found here:

CAM4-slab ocean:
CCSM4 (fully coupled):
ECHAM6-slab ocean:
ECHAM6 (fully coupled):

In addition, plots comparing the unfiltered and low-pass filtered (10-year low pass Lanczos filter) regression of simulated SST on these indices can be found here (unfiltered and low pass filtered indices are normalized before the regression is performed):

CAM4-slab ocean: PI_slab_ncar_cam4_som_AMO.png
CCSM4 (fully coupled): PI_coupled_ncar_ccsm4_AMO.png
ECHAM6-slab ocean: PI_slab_echam6_som_AMO.png
ECHAM6 (fully coupled): PI_coupled_echam6_AMO.png

NCL scripts for generating the AMO timeseries in the NCAR model are here:

CAM4-slab ocean: AMO_slab.ncl
CCSM4 (fully coupled): AMO_coupled.ncl

Observational data for the AMO index from NOAA ERSST version 3b can be found here.

From the Publication:

Clement, A. C., R. Seager, and M. A. Cane, 1999: Orbital controls on ENSO and the tropical climate. Paleoceanography, 14 (4), 441-456, doi: 10.1029/1999PA900013. [pdf]

You can download an ascii file here that contains results from a model run for the last 500 kyr. It's the same experiment as in the 1999 paper, but goes back further in time (with the orbital forcing). The first column is time (years BP), the second column is the 500-year mean NINO3 value, and the third column is the ENSO variance (degrees squared).

From the Publication:

Clement, A. C., R. Seager, and M. A. Cane, 2000: Suppression of El Niño during the mid-Holocene by changes in the Earth's orbit. Paleoceanography, 15 (6), 731-737, doi: 10.1029/1999PA000466. [pdf]

You can download a data file here that contains data from the ensemble for the Holocene. The first column is time (midpoint of the 100-year window) and the rest of the columns are the number of large warm events (> 3C) in 100 year windows. There are 8 ensemble members altogether - each with slightly different initial conditions, but the exact same orbital forcing.