Details
| Original language | English |
|---|---|
| Pages (from-to) | 1145-1166 |
| Number of pages | 22 |
| Journal | Journal of physical oceanography |
| Volume | 33 |
| Issue number | 6 |
| Publication status | Published - 1 Jun 2003 |
Abstract
Large-eddy simulation of open-ocean deep convection shows that the evolution of convection appears in a fundamentally different pattern, depending on the precondition of the ocean and the magnitude of the surface buoyancy flux. As the intensity of the cyclonic gyre in the ocean under the cooling increases, the pattern of convection is transformed from "distributed convection" to "localized convection." In localized convection the typical pattern of open-ocean deep convection appears, such as the generation of baroclinic instability and large lateral buoyancy transfer, secondary circulation, restratification, and the breakup of the original cyclonic gyre. On the other hand, in distributed convection small-scale convective plumes appear uniformly over the whole surface similarly to the convective boundary layer without generating the typical features of open-ocean deep convection. Hence, an enormous difference in the generated eddy kinetic energies exists between the two cases. It is also found that a stronger cooling at the sea surface suppresses the transition from distributed convection to localized convection. Dimensional analysis provides the parameters to characterize the pattern of convection, and the critical condition for the transition is estimated by analyzing the numerical results.
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Oceanography
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In: Journal of physical oceanography, Vol. 33, No. 6, 01.06.2003, p. 1145-1166.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - The role of preconditioning in the evolution of open-ocean deep convection
AU - Noh, Yign
AU - Cheon, Woo Geun
AU - Raasch, Siegfried
N1 - Funding Information: This work was supported by Ko- rea/Japan Joint Research Project of KOSEF, the Climate Environment System Research Center sponsored by the SRC program of KOSEF, and the Ecotechnopia Project by KIEST.
PY - 2003/6/1
Y1 - 2003/6/1
N2 - Large-eddy simulation of open-ocean deep convection shows that the evolution of convection appears in a fundamentally different pattern, depending on the precondition of the ocean and the magnitude of the surface buoyancy flux. As the intensity of the cyclonic gyre in the ocean under the cooling increases, the pattern of convection is transformed from "distributed convection" to "localized convection." In localized convection the typical pattern of open-ocean deep convection appears, such as the generation of baroclinic instability and large lateral buoyancy transfer, secondary circulation, restratification, and the breakup of the original cyclonic gyre. On the other hand, in distributed convection small-scale convective plumes appear uniformly over the whole surface similarly to the convective boundary layer without generating the typical features of open-ocean deep convection. Hence, an enormous difference in the generated eddy kinetic energies exists between the two cases. It is also found that a stronger cooling at the sea surface suppresses the transition from distributed convection to localized convection. Dimensional analysis provides the parameters to characterize the pattern of convection, and the critical condition for the transition is estimated by analyzing the numerical results.
AB - Large-eddy simulation of open-ocean deep convection shows that the evolution of convection appears in a fundamentally different pattern, depending on the precondition of the ocean and the magnitude of the surface buoyancy flux. As the intensity of the cyclonic gyre in the ocean under the cooling increases, the pattern of convection is transformed from "distributed convection" to "localized convection." In localized convection the typical pattern of open-ocean deep convection appears, such as the generation of baroclinic instability and large lateral buoyancy transfer, secondary circulation, restratification, and the breakup of the original cyclonic gyre. On the other hand, in distributed convection small-scale convective plumes appear uniformly over the whole surface similarly to the convective boundary layer without generating the typical features of open-ocean deep convection. Hence, an enormous difference in the generated eddy kinetic energies exists between the two cases. It is also found that a stronger cooling at the sea surface suppresses the transition from distributed convection to localized convection. Dimensional analysis provides the parameters to characterize the pattern of convection, and the critical condition for the transition is estimated by analyzing the numerical results.
UR - http://www.scopus.com/inward/record.url?scp=0037669748&partnerID=8YFLogxK
U2 - 10.1175/1520-0485(2003)033<1145:TROPIT>2.0.CO;2
DO - 10.1175/1520-0485(2003)033<1145:TROPIT>2.0.CO;2
M3 - Article
AN - SCOPUS:0037669748
VL - 33
SP - 1145
EP - 1166
JO - Journal of physical oceanography
JF - Journal of physical oceanography
SN - 0022-3670
IS - 6
ER -