Polynomial Chaos (PC) expansions are used to propagate parametric uncertainties in an ocean general circulation model. The computations focus on shorttime, high-resolution simulations of the Gulf of Mexico (GOM), using the HYbrid Coordinate Ocean Model (HYCOM), with wind stresses corresponding to hurricane Ivan. A sparse quadrature approach is used to determine the PC coefficients which provide...

The multiple equilibria of the thermohaline circulation (THC: used here in the sense of the meridional overturning circulation) as function of the surface freshwater flux has been studied intensively following a Stommel paper from 1961. It is shown here that multistability and hysteresis of the THC also exist when the wind stress amplitude is varied as a control parameter. Both the Massachusett...

A parameterization of mesoscale eddies in coarse-resolution ocean general circulation models (GCM) is formulated and implemented using a residual-mean formalism. In that framework, mean buoyancy is advected by the residual velocity (the sum of the Eulerian and eddy-induced velocities) and modified by a residual flux which accounts for the diabatic effects of mesoscale eddies. The residual veloc...

[1] Global-land mean observations of 20th century precipitation are compared to modelled values using an optimal regression technique for nine general circulation models. The combined influence of major anthropogenic and natural forcings is detected in five cases. Comparing the accuracy of precipitation and temperature simulation of each model, we find that low temperature simulation accuracy p...

The detection of anthropogenic climate change in observations and the validation of climate models both rely on understanding natural climate variability. To evaluate internal climate variability, we apply spectral analysis to time series of surface air temperature (SAT) from nine coupled general circulation model (GCM) simulations, three recent global paleotemperature reconstructions, and Nort...

abstract in this research, four meteorological set of data including maximum temperature, minimum temperature, precipitation and radiation from echo-g, under a1scenario have been used for climate change detection over south khorasan. echo-g is a general circulation model that currently is used in hamburg university and korea meteorological research institute. in this research climate change ass...

abstract background: weather and climate play a significant role in human health. we are accustomed to affects the weather conditions. by increasing or decreasing the environment temperature or change of seasons, some diseases become prevalent or remove. this study investigated the role of temperature in cardiovascular disease mortality of city of mashhad in the current decade and its simulatio...

abstract in this study we have used the monthly data resulted from the calculation of temperature and precipitation for a 52-year period (1951-2003). the doubling effect of carbon dioxide ( ) on temperature and precipitation was modeled as the most important climatic parameters. the resulting hythergraph and ambrothermic models for tabriz indicate monthly increases of temperature and precipitat...

In this paper we describe the parallelization of a local area ocean circulation model using HPF. We nd that this particular problem, leading to a typical data parallel algorithm is easily expressed in HPF. The problems which occurs is mainly due to restrictions in the current HPF-compilers. We have run our program on 3 diierent platforms, using diierent HPF-compilers. and will report on the sta...