David F. Parrish

TL;DR: The North American Regional Reanalysis (NARR) project as mentioned in this paper uses the NCEP Eta model and its Data Assimilation System (at 32-km-45-layer resolution with 3-hourly output) to capture regional hydrological cycle, the diurnal cycle and other important features of weather and climate variability.

TL;DR: Results from several months of parallel testing with the NMC spectral model have been very encouraging, and favorable features include smoother analysis increments, greatly reduced changes from initialization, and significant improvement of 1-5-day forecasts.

TL;DR: In this article, the concentrations of ozone, nitrogen oxides, and nonmethane hydrocarbons measured near the surface in a variety of urban, suburban, rural, and remote locations are analyzed and compared in order to elucidate the relationships between ozone, its photochemical precursors, and the sources of these precursor.

TL;DR: In this paper, a global three-dimensional variational analysis system is formulated in model grid space, where the horizontal scales of variables are obtained through the variances of the variables and of their Laplacian.

TL;DR: The Gridpoint Statistical Interpolation (GSI) as mentioned in this paper was developed at the Environmental Modeling Center at NCEP as part of an effort to create a more unified, robust, and efficient analysis scheme.