Imperial College London


Faculty of Natural SciencesDepartment of Mathematics

Reader in Applied Mathematics



+44 (0)20 7594 9662p.berloff Website




745Huxley BuildingSouth Kensington Campus






BibTex format

author = {Khatri, H and Berloff, P},
doi = {10.1017/jfm.2018.260},
journal = {Journal of Fluid Mechanics},
pages = {392--416},
title = {A mechanism for jet drift over topography},
url = {},
volume = {845},
year = {2018}

RIS format (EndNote, RefMan)

AB - The dynamics of multiple alternating oceanic jets has been studied in the presence of a simple bottom topography with constant slope in the zonal direction. A baroclinic quasi-geostrophic model forced with a horizontally uniform and vertically sheared background flow generates mesoscale eddies and jets that are tilted from the zonal direction and drift with constant speed. The governing dynamical equations are rewritten in a tilted frame of reference moving with the jets, and the cross-jet time-mean profiles of the linear and nonlinear stress terms are analysed. Here, the linear stress terms are present because of the zonally asymmetric topography. It is demonstrated that the linear dynamics controls the drift mechanism. Also, it is found that the drifting jets are directly forced by the imposed vertical shear, whereas the eddies oppose the jets, although this is limited to continuously forced dissipative systems. This role of the eddies is opposite to the one in the classical baroclinic model of stationary, zonally symmetric multiple jets. This is expected to be more generic in the ocean, which is zonally asymmetric nearly everywhere.
AU - Khatri,H
AU - Berloff,P
DO - 10.1017/jfm.2018.260
EP - 416
PY - 2018///
SN - 0022-1120
SP - 392
TI - A mechanism for jet drift over topography
T2 - Journal of Fluid Mechanics
UR -
UR -
UR -
VL - 845
ER -