Future climate forcing data at the temporal and spatial scales needed to drive hydrologic models are not readily available. Simple methods to derive these data from historical data or General Circulation Model (GCM) results may not adequately capture future hydrological variability. This study assessed streamflow response to daily future climate forcing data produced by a new method using subse...

The Tibetan Plateau (TP) is a key region of land–atmosphere interactions with severe eco-environment degradation. This study uses an atmospheric general circulation model, NCEP GCM/SSiB, to present the major TP summer climate features for six selected ENSO years and preliminarily assess the possible impact of land cover change on the summer circulation over the TP. Compared to Reanalysis II dat...

Dynamical downscaling of General Circulation Model (GCM) data for any region has been made possible due to a set physics options and model dynamics within the Weather Research Forecasting (WRF) model. This study evaluated performance an ensemble in simulating rainfall during wet dry seasons Lao PDR. The evaluation criteria focused on identifying optimum range scenarios. No single combination pe...

[1] Off-line chemistry and transport models (CTMs) use meteorological information from a general circulation model (GCM) or from a data assimilation system (DAS) to calculate the evolution of stratospheric constituents. Here constituent fields from two CTM simulations are compared with each other and with observations from satellite, aircraft, and sondes to judge the realism of the tropical tra...

Randall et al. (1996) summarized a strategy for testing parameterizations in single-column models (SCMs). The SCM is driven with observations and the results produced by the SCM are compared with additional observations of the same meteorological events. When the SCM’s parameterizations are judged to have performed satisfactorily in tests against observations, they can be transplanted into a th...

A single column model (SCM) is, in essence, an isolated grid column of a general circulation model (GCM). Hence, SCMs have rather demanding input data requirements, but do not suffer from problems associated with balance of a GCM. Among the initial conditions that must be used to describe the initial state of the SCM column are the vertical profile of the horizontal wind components and the vert...

This report examines the e ect of model bias within a data assimilation sys tem For this study we use the Goddard Earth Observing System GEOS Data Assimilation System DAS which employs the Incremental Analysis Updating IAU procedure In such a procedure the after analysis minus rst guess in crements are used as external forcing within a general circulation model GCM to provide corrective adjustm...

The influence of Atlantic sea surface temperature (SST) anomalies on the atmospheric circulation over the North Atlantic sector during winter is investigated by performing experiments with an atmospheric general circulation model (GCM). These consist of a 30-year run with observed SST anomalies for the period 1961–90 confined geographically to the Atlantic Ocean, and of a control run with clima...

[1] This study explores the impact of spring subsurface soil temperature (SUBT) anomaly in the western U.S. on North American summer precipitation, mainly southeastern U.S., and possible mechanisms using a regional climate Eta model and a general circulation model (GCM). The GCM produces the lateral boundary condition (LBC) for the Eta model. Two initial SUBT conditions (one cold and another wa...

Diabatic heating plays a crucial role in the formation and maintenance of the West African Monsoon. A dynamical core configuration of a General Circulation Model (GCM) is used to test the influence of diabatic heating from different sources and regions on the strength and northward penetration of the monsoon circulation. The dynamical core is able to capture the main features of the monsoon flo...