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Data from: Precession modulation of the South Pacific westerly wind belt over the past million years

Chiang, John, University of California, Berkeley, https://orcid.org/0000-0001-7723-9544
Lamy, Frank, Helmholtz-Zentrum Geesthacht Centre for Materials and Coastal Research
jch_chiang@berkeley.edu, Frank.Lamy@awi.de
Published Dec 12, 2019 on Dryad. https://doi.org/10.6078/D1DX1P

Cite this dataset

Chiang, John; Lamy, Frank (2019). Data from: Precession modulation of the South Pacific westerly wind belt over the past million years [Dataset]. Dryad. https://doi.org/10.6078/D1DX1P

Abstract

This archive contain the model output used in the publication 

Lamy, F., J. C.H. Chiang, G. Martínez-Méndez, M. Thierens, H.W. Arz, J.H.C. Bosmans, D. Hebbeln, F. Lambert, L. Lembke-Jene, J-B. Stuut: "Precession modulation of the South Pacific westerly wind belt over the past million years".  Revised for the Proceedings of the National Academy of Sciences, July 2019.

They only contain the monthly mean climatological GFDL model output; output for EC Earth is archive elsewhere. 

The original publication for this data is Erb, M.P., Broccoli, A.J., Graham, N.T., Clement, A.C., Wittenberg, A.T. and Vecchi, G.A., 2015. Response of the equatorial Pacific seasonal cycle to orbital forcing. Journal of Climate, 28(23), pp.9258-9276.  The authors have made a more complete set of data available at Erb, Michael, Broccoli, Anthony, & Raney, Bryan. (2018). Idealized single-forcing GCM simulations with GFDL CM2.1 (Version 1.0.0) [Data set]. Zenodo. http://doi.org/10.5281/zenodo.1194480

The model output is published here with permission from Dr. Anthony J. Broccoli.

Usage notes

90_WSOL.1201-1300.monthly.fixed_ang.nc contains climatological monthly mean output from the "Winter Solstice" (WS) simulation in Erb et al. (2015).  270_SSOL.1201-1300.monthly.fixed_ang.nc contains climatological monthly mean output from the "Summer Solstice" (SS) simulation in Erb et al. (2015).  The climatological monthly means are computed over years 1201-1300 of the simulation. 

Data format is in Netcdf.  The output fields include

  • EKE28_850 - 2-8 day bandpassed Eddy Kinetic Energy at 850mb
  • land_mask - land mask
  • PRECIP - precipitation 
  • QU_850 - zonal moisture flux at 850mb
  • QV_850 - meridional moisture flux at 850mb
  • SLP - sea level pressure
  • T_SURF - surface temperature
  • UCOMP - zonal wind

QU_850 and QV850 are computed from daily averaged 850mb specific humidty, zonal and meridional winds  over years 1201-1300 of the model simulation. 

EKE28_850 are computed from daily averaged zonal and meridional winds over years 1201-1300 of the model simulation.   The synoptic scale (2-8 day) filtering was done following the method used in Inatsu and Hoskins (2004).

Reference

Inatsu, M. and Hoskins, B.J., 2004. The zonal asymmetry of the Southern Hemisphere winter storm track. Journal of climate, 17(24), pp.4882-4892.