Sixth-order difference scheme for sigma coordinate ocean models
Chu, Peter C.
MetadataShow full item record
How to reduce the horizontal pressure gradient error is a key issue of using s-coordinate ocean models, especially of using primitive equation models for coastal regions. The error is caused by the splitting of the horizontal pressure gradient term into two parts and the subsequent incomplete cancellation of the truncation errors of those parts. Due to the fact that the higher the order of the difference scheme, the less the truncation error and the more complicated the computation, a sixth-order difference scheme for the s-coordinate ocean models is proposed in order to reduce error without increasing complexity of the computation. After the analytical error estimation, the Semi-spectral Primitive Equation Model is used to demonstrate the beneﬁt of using this scheme. The stability and accuracy are compared with those of the second-order and fourth-order schemes in a series of calculations of unforced ﬂow in the vicinity of an isolated seamount. The sixth-order scheme is shown to have error reductions by factors of 5 compared to the fourth-order difference scheme and by factors of 50 compared to the second-order difference scheme over a wide range of parameter space as well as a great parametric domain of numerical stability.
Journal of Physical Oceanography, American Meteorological Society
Showing items related by title, author, creator and subject.
Fan, Chenwu; Chu, Peter C. (2001-07);How to reduce the computational error is a key issue in numerical modeling and simulation. The higher the order of the difference scheme, the less the truncation error and the more complicated the computation. For compromise, ...
Fan, Chenwu; Chu, Peter C. (1997);How to reduce the computation error is a key issue of using a-coordinate coastal ocean models. Due to the fact that the higher the order of the difference scheme, the less the truncation error and the more complicated the ...
Warm Layer and Cool Skin Corrections for Bulk Water Temperature Measurements for Air-Sea Interaction Studies Alappattu, Denny P.; Wang, Qing; Yamaguchi, Ryan; Lind, Richard J.; Reynolds, Mike; Christman, Adam J. (2017-05);The sea surface temperature (SST) relevant to air-sea interaction studies is the temperature immediately adjacent to the air, referred to as skin SST. Generally, SST measurements from ships and buoys are taken at depths ...