摘要:

Total angular momentum of fluid within an ocean basin consists of a part due to center of mass of the fluid rotating about Earth's axis and a part due to relative motion within the basin. In rotating planar geometry (ƒ plane) the relative angular momentum due to motion within a basin can be expressed as an integral of mass transport stream function. This simple relationship is used to examine the consistency of free‐slip “sidewall” boundary conditions applied to a homogeneous ocean model with viscous interior. One finds that the fluid exchanges angular momentum with the basin by means of the normal component of viscous stress, so that a closed angular momentum budget is recovered despite the use of free‐slip boundary conditions. Cases of flow in an enclosed rectangular basin and in an open (infinite) channel are considered. Resolution of budget questions for these idealized cases opens a question concerning real ocean gyres: How is wind‐supplied angular momentu

ISSN:0148-0227    

DOI:10.1029/90JC02256

年代:1991

数据来源: WILEY

摘要:

A general circulation model of the tropical Pacific Ocean is used to simulate the seasonal cycle in response to two sets of forcing functions. The first set consists of climatological estimates of the stress and heat fluxes, and the second set is derived from an atmospheric general circulation model. In most areas the model fluxes are within the levels of uncertainty in the climatological estimates. Although qualitatively similar, the two flux data sets produce two very different ocean model simulations of near surface conditions. In the experiment with climatological fluxes the east Pacific cold tongue is too cold whereas the west Pacific temperatures are well simulated; the North Equatorial Counter Current (NECC) is too weak and the strength of the undercurrent agrees well with observed estimates. In the experiment with model fluxes the cold tongue is simulated reasonably well but the west Pacific temperatures are too high; the NECC is too strong and the undercurrent is rather weak. These results, and how they relate to the forcing, are discussed in detail. It is concluded that the ocean model simulation is very sensitive to the differences in the surface forcing functions. The ocean model results are compared with those from other simulations of the seasonal cycle in the tropical Pacific.

ISSN:0148-0227    

DOI:10.1029/90JC01403

年代:1991

数据来源: WILEY

ISSN:0148-0227    

DOI:10.1029/90JC01849

年代:1991

数据来源: WILEY

ISSN:0148-0227    

DOI:10.1029/90JC01857

年代:1991

数据来源: WILEY