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The NCEP/NCAR 40-year reanalysis project (http://www.esrl.noaa.gov/psd) E. Kalnay, M. Kanamitsu, R. Kistler, W. Collins, D. Deaven, L. Gandin, M. Iredell, S. Saha, G. White, J. Woollen, Y. Zhu, M. Chelliah, W. Ebisuzaki, W. Higgins, J. Janowiak, K. C. Mo, C. Ropelewski, J. Wang, A. Leetmaa, R. Reynolds, R. Jenne, and D. Joseph https://doi.org/10.1175/1520-0477(1996)077<0437:TNYRP>2.0.CO;2

The CONCORDIASI project in Antarctica (http://www.lmd.polytechnique.fr/VORCORE/McMurdoE.htm) F. Rabier, A. Bouchard, E. Brun, A. Doerenbecher, S. Guedj, V. Guidard, F. Karbou, V.-H. Peuch, L. El Amraoui, D. Puech, et al. https://doi.org/10.1175/2009BAMS2764.1

MERRA: NASA's Modern-Era Retrospective Analysis for Research and Applications (https://disc.gsfc.nasa.gov/mdisc/overview) M. M. Rienecker, M. J. Suarez, R. Gelaro, R. Todling, J. Bacmeister, E. Liu, M. G. Bosilovich, S. D. Schubert, L. Takacs, G.-K. Kim, S. Bloom, J. Chen, D. Collins, A. Conaty, A. da Silva, W. Gu, J. Joiner, R. D. Koster, R. Lucchesi, A. Molod, T. Owens, S. Pawson, P. Pegion, C. R. Redder, R. Reichle, F. R. Robertson, A. G. Ruddick, M. Sienkiewicz, and J. Woollen https://doi.org/10.1175/JCLI-D-11-00015.1