NWP Experiments with a Gridpoint Semi-Lagrangian Semi-ImplicitGlobal Model at NCEP
نویسندگان
چکیده
منابع مشابه
Semi - Lagrangian relaxation ∗
Lagrangian relaxation is commonly used in combinatorial optimization to generate lower bounds for a minimization problem. We propose a modified Lagrangian relaxation which used in (linear) combinatorial optimization with equality constraints generates an optimal integer solution. We call this new concept semi-Lagrangian relaxation and illustrate its practical value by solving large-scale instan...
متن کاملGlobal semi-Lagrangian advection
In the recent years, many international centers for numerical weather prediction and climate modeling have adopted in their operational codes a semiLagrangian scheme for transport. This numerical technique became very popular due to its stability and accuracy properties. The time step is only restricted by accuracy and not by a CFL stability condition. In a joint effort with CPTEC/INPE (the Bra...
متن کاملA Semi-implicit Semi-lagrangian Shallow-water Model for Massively Parallel Processors
The formulation of a grid point shallow-water model proposed by C^ ot e and Stan-iforth is described. The model employs a hybrid nite-volume//nite-element spatial discretisation on a staggered Arakawa B type grid, where the geopoten-tial is computed at grid points and the wind u is found at grid cell centers. Time integration is based upon a two-time-level semi-implicit, semi-Lagrangian scheme....
متن کاملA Semi-Implicit Semi-Lagrangian Finite-Element Shallow-Water Ocean Model
The nite-element, semi-implicit, and semi-Lagrangian methods are combined together to solve the shallow-water equations using unstructured triangular meshes. Triangular nite elements are attractive for ocean modeling because of their exibility for representing irregular boundaries and for local mesh re nement. A \kriging" interpolator is used for the semi-Lagrangian advection, leading to an acc...
متن کاملChapter 6 . Semi - Lagrangian Methods
Semi-Lagrangian (S-L for short) methods, also called quasi-Lagrangian, have been around since the early 1960’s. T.N. Krishnamurti is probably the first to use S-L method. The S-L scheme becomes really popular following Andre Robert’s work in the early 80’s (Robert 1982) when he combined the use of S-L with semi-implicit method (SLSI) which allows for large time step size because both schemes ar...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Monthly Weather Review
سال: 1997
ISSN: 0027-0644,1520-0493
DOI: 10.1175/1520-0493(1997)125<0074:newags>2.0.co;2