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Wanli Wu, Amanda H. Lynch, Sheldon Drobot, James Maslanik, A. David McGuire, and Ute Herzfeld

Grell deep convective parameterization ( Grell et al. 1994 ), the Medium-Range Forecasting (MRF) planetary boundary layer scheme ( Hong and Pan 1996 ), and the Reisner explicit cloud microphysics parameterization ( Reisner et al. 1998 ). This latter parameterization predicts the mixing ratio of cloud water and ice crystals as well as the rain and snow water mixing ratios. The Rapid Radiative Transfer Model (RRTM; Mlawer et al. 1997 ) is chosen for longwave radiation, and the delta

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Ute C. Herzfeld, Sheldon Drobot, Wanli Wu, Charles Fowler, and James Maslanik

studies presented in this paper, we focus on MM5 temperature and precipitation grids for the model years 1992–2000 ( Wu et al. 2007 ) and compare them to several compiled or reanalyzed datasets that are frequently used in the climate research community. These include temperature and precipitation datasets from 1) the 40-yr European Centre for Medium-Range Weather Forecasts (ECMWF) Re-Analysis (ERA-40; see Gibson et al. 1997 ); 2) University of Delaware climate datasets [UDEL (MW); see Willmott and

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Sheldon Drobot, James Maslanik, Ute Christina Herzfeld, Charles Fowler, and Wanli Wu

. 1996 ), 15-yr European Centre for Medium-Range Weather Forecasts (ECMWF) Re-Analyses (ERA-15; Gibson et al. 1997 ), and the Climatic Research Unit/University of East Anglia CRUTEM2v (CRU; Jones et al. 2001 ) datasets were analyzed. The results indicated that temperature differences between the NCEP1 and CRU datasets were largest in winter and smallest in summer, with NCEP1 being warmer over North America; comparisons for NCEP1 and ERA-15 were similar, whereas ERA-15 was noticeably warmer than CRU

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