Abstract
The importance of bottom topography in the linear baroclinic instability of zonal flows on the β plane is examined by using analytical calculations and a quasigeostrophic eddy-resolving numerical model. The particular focus is on the effects of a zonal topographic slope, comparedwith the effects of ameridional slope.A zonal slope always destabilizes background zonal flows that are otherwise stable in the absence of topography regardless of the slope magnitude, whereas the meridional slopes stabilize/destabilize zonal flows only through changing the lower-level background potential vorticity gradient beyond a known critical value. Growth rates, phase speeds, and vertical structure of the growing solutions strongly depend on the slope magnitude. In the numerical simulations configured with an isolatedmeridional ridge, unstablemodes develop on both sides of the ridge and propagate eastward of the ridge, in agreement with analytical results.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 790-804 |
| Number of pages | 15 |
| Journal | J. PHYSICAL OCEANOGRAPHY |
| Volume | 43 |
| Issue number | 4 |
| DOIs | |
| State | Published - Apr 2013 |
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ASJC Scopus subject areas
- Oceanography
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Effects of topography on baroclinic instability. / Chen, Changheng; Kamenkovich, Igor.
In: J. PHYSICAL OCEANOGRAPHY, Vol. 43, No. 4, 04.2013, p. 790-804.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effects of topography on baroclinic instability
AU - Chen, Changheng
AU - Kamenkovich, Igor
PY - 2013/4
Y1 - 2013/4
N2 - The importance of bottom topography in the linear baroclinic instability of zonal flows on the β plane is examined by using analytical calculations and a quasigeostrophic eddy-resolving numerical model. The particular focus is on the effects of a zonal topographic slope, comparedwith the effects of ameridional slope.A zonal slope always destabilizes background zonal flows that are otherwise stable in the absence of topography regardless of the slope magnitude, whereas the meridional slopes stabilize/destabilize zonal flows only through changing the lower-level background potential vorticity gradient beyond a known critical value. Growth rates, phase speeds, and vertical structure of the growing solutions strongly depend on the slope magnitude. In the numerical simulations configured with an isolatedmeridional ridge, unstablemodes develop on both sides of the ridge and propagate eastward of the ridge, in agreement with analytical results.
AB - The importance of bottom topography in the linear baroclinic instability of zonal flows on the β plane is examined by using analytical calculations and a quasigeostrophic eddy-resolving numerical model. The particular focus is on the effects of a zonal topographic slope, comparedwith the effects of ameridional slope.A zonal slope always destabilizes background zonal flows that are otherwise stable in the absence of topography regardless of the slope magnitude, whereas the meridional slopes stabilize/destabilize zonal flows only through changing the lower-level background potential vorticity gradient beyond a known critical value. Growth rates, phase speeds, and vertical structure of the growing solutions strongly depend on the slope magnitude. In the numerical simulations configured with an isolatedmeridional ridge, unstablemodes develop on both sides of the ridge and propagate eastward of the ridge, in agreement with analytical results.
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U2 - 10.1175/JPO-D-11-0145.1
DO - 10.1175/JPO-D-11-0145.1
M3 - Article
VL - 43
SP - 790
EP - 804
JO - Journal of Physical Oceanography
JF - Journal of Physical Oceanography
SN - 0022-3670
IS - 4
ER -