Land mask as a single
SpatialPolygons object. The land mask was
obtained from the CM2.5 Forecast-oriented Low-Ocean Resolution (FLOR) model
produced by the National Oceanic and Atmospheric Administration’s Geophysical
Fluid Dynamics Laboratory converted to a Polar Stereographic grid. (Vecchi
et al. 2014; Msadek et al. 2014).Weights for converting to a polar
stereograhic grid were obtained from the spherical
coordinate remapping and interpolation package (SCRIP) (Jones 1997).
CM2.5 Forecast-oriented Low-Ocean Resolution (FLOR) model: Vecchi, Gabriel A., et al. "On the seasonal forecasting of regional tropical cyclone activity." Journal of Climate 27.21 (2014): 7994-8016.
Msadek, R., et al. "Importance of initial conditions in seasonal predictions of Arctic sea ice extent." Geophysical Research Letters 41.14 (2014): 5208-5215. National Center for Atmospheric Research, 2017: Earth system grid at NCAR. https://www.earthsystemgrid.org/home.html.
Jones, P.W. "A user’s guide for SCRIP: A spherical coordinate remapping and interpolation package." Los Alamos National Laboratory, Los Alamos, NM (1997).
Region Mask:National Snow and Ice Data Center, 2017: Region mask for the northern hemisphere. http://nsidc.org/data/polar-stereo/tools_masks.html.
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