[1] Sandia Natl Labs, Quantitat Modeling & Software Engn Dept, Livermore, CA 94587 USA
[2] Stockholm Univ, Dept Math, Sci Comp Applicat Climate Sci, SE-10691 Stockholm, Sweden
[3] Los Alamos Natl Lab, Fluid Dynam & Solid Mech Grp, Los Alamos, NM 87545 USA
[4] Sandia Natl Labs, Ctr Comp Res, Albuquerque, NM 87185 USA