Samuel S. P. Shen

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By Norden E. Huang1, Man-L i C. W u2, Steven R. Long3, Samuel S. P. Shen4, Wendong Q u5, Per Gloersen1 and Kuang L. Fan6 1Code 971, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA ( 2Code 910, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA 3Code 972, NASA GSFC/Wallops Flight Facility, Wallops Island, VA 23337,(More)
Laboratory for Hydrospheric Processes/Code 971, NASA Goddard Space Flight Center, Greenbelt, MD 20771, U.S.A. Laboratory for Atmospheres/Code 910, NASA Goddard Space Flight Center, Greenbelt, MD 20771, U.S.A. Engineering Sciences, California Institute of Technology, Pasadena, CA 91125, U.S.A. Laboratory for Hydrospheric Processes/Code 972, NASA Wallops(More)
Soil quality models developed for ecodistrict polygons (EDP) and the polygons of the soil landscapes of Canada (SLC) to monitor the concentration of soil organic matter require daily climate data as an important input. The objectives of this paper are (i) to provide a method that interpolates the daily station data onto the 894 SLC polygons and 150 EDP in(More)
This paper provides a systematic procedure for computing the regional average of climate data in a subregion of the earth surface using the covariance function written in terms of empirical orthogonal functions (EOFs). The method is optimal in the sense of minimum mean square error (mse) and gives an mse estimate of the averaging results. The random(More)
[1] In this paper, we evaluate the performance of 19 coupled general circulation models (CGCMs) in twentieth-century simulations of the Sahel during the 1970s to 1990s. Correlation, regression, and cluster analyses are applied to observations and model outputs including Sahel monthly precipitation, evaporation, soil moisture, and sea surface temperature(More)
An improved land–ocean global monthly precipitation anomaly reconstruction is developed for the period beginning in 1900. Reconstructions use the available historical data and statistics developed from the modern satellite-sampled period to analyze variations over the historical presatellite period. This paper documents the latest in a series of(More)
[1] Drought and sea surface temperature were examined as the causes of severe biomass burning C emissions in Indonesia for 1997–2006, obtained from the Global Fire Emissions Database. Eighteen predictor variables were considered under log linear and piecewise regression models. The predictor variables considered were precipitation totals of up to 6 months,(More)
[1] In semi-arid areas, multiple equilibrium states of an ecosystem (e.g., grassland and desert) are found to coexist, and the transition from grassland to desert is often abrupt at the boundary. A simple ecosystem model is developed to provide the biophysical explanation of this phenomenon. The model has three variables: living biomass, wilted biomass, and(More)
We present a new characterization of termination of general logic programs. Most existing termination analysis approaches rely on some static information about the structure of the source code of a logic program, such as modes/types, norms/level mappings, models/interargument relations, and the like. We propose a dynamic approach that employs some key(More)