Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/8953
DC Field | Value | Language |
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dc.contributor.authorall | Masina, S.; Istituto di Scienze dell'Atmosfera e dell'Oceano, CNR, Bologna, Italy. | en |
dc.contributor.authorall | Philander, S. G. H.; Atmospheric and Oceanic Sciences Program, Princeton University, Princeton, New Jersey | en |
dc.contributor.authorall | Bush, A. B. G.; Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta, Canada | en |
dc.date.accessioned | 2014-02-27T07:47:50Z | en |
dc.date.available | 2014-02-27T07:47:50Z | en |
dc.date.issued | 1999-12-15 | en |
dc.identifier.uri | http://hdl.handle.net/2122/8953 | en |
dc.description.abstract | The instability processes which generate unstable waves with chara- cteristics similar to observed tropical instability waves in the Pacific Ocean are examined through a local energy analysis based on deviations from the time mean flow. Numerical experiments indicate that the waves develop preferentially in the eastern Pacific along the northern temperature front and have a westward phase speed and a structure with two peaks in amplitude: one located on the equator and the other a few degrees north of it. The energy analysis shows that the "two-peak" structure of the eastern waves is explained by two different instability processes which occur at different latitudes. In the time mean sense the region north of the equator is baroclinically unstable, while barotropic instability prevails at the equator. The life cycle of the waves is revealed by the time evolution of the energetics. Baroclinic instability is the dominant triggering mechanism which induces growth of the waves along the northern temperature front. The eddy pressure fluxes radiate energy south of the equator where the rneridional shear between the Equatorial Undercurrent and the South Equatorial Current becomes barotropically unstable. From the numerical simulations, there is evidence of a second unstable region in the central Pacific south of the equator where the instabilities have a lower phase speed. The energy analysis also shows that these waves grow from both barotropic and baroclinic conversions. | en |
dc.description.sponsorship | This work was supported by the Department of Com- merce/NOAA under grant NA56GP0026. One of the au- thors (SM) was partially supported by a NASA Global Change Fellowship NGT-30288. Another author (AB) was supported by a UCAR Postdoctoral Fellowship | en |
dc.language.iso | English | en |
dc.publisher.name | American Geophysical Union | en |
dc.relation.ispartof | Journal of geophysical research - earth surface | en |
dc.relation.ispartofseries | C12/104 (1999) | en |
dc.subject | Ocean modeling | en |
dc.subject | Equatorial Ocean | en |
dc.subject | Tropical Instability Waves | en |
dc.subject | Ocean wave generation | en |
dc.subject | Ocean wave energetics | en |
dc.title | An analysis of tropical instability waves in a numerical model of the Pacific Ocean - 2. Generation and energetics of the waves | en |
dc.type | article | en |
dc.description.status | Published | en |
dc.type.QualityControl | Peer-reviewed | en |
dc.description.pagenumber | 29637-29661 | en |
dc.subject.INGV | 03. Hydrosphere::03.01. General::03.01.01. Analytical and numerical modeling | en |
dc.identifier.doi | 10.1029/1999JC900226 | en |
dc.relation.references | Chang, E.K.M., and I. Orlanski, On the dynamics of a storm track, J. Atrnos. $ci., 50, 999-1015, 1993. Cox, M.D., Generation and propagation of 30-day waves in a numerical model of the Pacific, J. Phys. Oceanogr., 10, 1168-1186, 1980. Flament, P., S. Kennan, R. Knox, P. Niiler, and R. Bern- stein, The three-dimensional structure of an upper ocean vortex in the tropical Pacific, Nature, 383, 610-613, 1996. Hansen, D.V., and C.A. Paul, Genesis and effects of long waves in the equatorial Pacific, J. Geophys. Res., 89, 10,431-10,440, 1984. Hayashi, Y.Y., and W.R. Young, Stable and unstable shear modes of rotating parallel flows in shallow water, J. Fluid Mech., 184, 477-504, 1987. Kuo, H.L., Dynamic instability of two-dimensional non- divergent flow in a barotropic atmosphere, J. Meteorol., 6, 105-122, 1949. Legeckis, R., Long waves in the eastern equatorial Pacific Ocean: A view from a geostationary satellite, Science, 197, 1179-1181, 1977. Luther, D.S., and E.S. Johnson, Eddy energetics in the up- per equatorial Pacific during the Hawaii-to-Tahiti Shuttle Experiment, J. Phys. Oceanogr., 20, 913-944, 1990. Marinone, S.G., and P. Ripa, Energetics of the instability of a depth-independent equatorial jet, Geophys. Astrophys. Fluid Dyn., 30, 105-130, 1984. Masina, S., Tropical instability waves in the Pacific Ocean, Ph.D. thesis, 242 pp., Princeton Univ., Princeton, N.J., 1996. Masina, S., and S.G.H. Philander, An analysis of tropical in- stability waves in a numerical model of the Pacific Ocean, 1, Spatial variability of the waves, J. Geophys. Res., this issue. McCreary, J.P., Jr, and Z. Yu, Equatorial dynamics in a 21/2-layer model, Prog. Oceanogr., 29, 61-132, 1992. Mcintyre, M.E., An introduction to the generalized lagran- gian-mean description of wave, mean-flow interaction, Pure Appl. Geophys., 118, 152-176, 1980. McPhaden, M.J., Monthly period oscillations in the Pacific North Equatorial Countercurrent, J. Geophys. Res., 101, 6337-6359, 1996. Orlanski, I., and J. Katzfey, The life cycle of a cyclone wave in the Southern Hemisphere, 1, Eddy energy budget, J. Atmos. Sci., 48, 1972-1998, 1991. Peixoto, J.P., and A.H. Oort, Physics of Climate, 520pp., Am. Inst. of Phys. College Park, Md., 1992. Philander, S.G.H., Instabilities of zonal equatorial currents, J. Geophys. Res., 81, 3725-3735, 1976. Philander, S.G.H., Instabilities of zonal equatorial currents, 2, J. Geophys. Res., 83, 3679-3682, 1978. Plumb, R.A., A new look at the energy cycle, J. A tmos. Sci., J0, 1669-1688, 1983. Proehl, J.A., Linear stability of equatorial flows, J. Phys. Oceanogr., 26, 601-621, 1996. Qiao, L., and R.H. Weisberg, Tropical instability wave kine- matics: Observations from the Tropical Instability Wave Experiment, J. Geophys. Res., 100, 8677-8693, 1995. Qiao, L., and R.H. Weisberg, Tropical instability wave en- ergetics: Observations from the Tropical Instability Wave Experiment, J. Phys. Oceanogr., 28, 345-360, 1998. Schopf, P.S., Shallow baroclinic instability in the tropical oceans, in Recent Progress in Equatorial Oceanography, edited by J.P. McCreary Jr., D.W. Moore, and J.M. Witte, pp. 189-195, Nova University Press, Ft. Laud- erdale, FL, 1981. Semtner, A.J., Jr, and W.R. Holland, Numerical simulation of equatorial ocean circulation, 1, A basic case in turbu- lent equilibrium, J. Phys. Oceanogr., 10, 667-693, 1980. Weisberg, R.H., Equatorial Waves during GATE and their relation to the mean zonal circulation, Deep Sea Res., Part A, 26, suppl. 2, 179-198, 1979. Wilson, D., and A. Leetmaa, Acoustic Doppler current pro- filing in the equatorial Pacific in 1984, J. Geophys. Res., 93, 13947-13966, 1988. Yu, Z., J.P. McCreary Jr., and J.A. Proehl, Meridional asymmetry and energetics of tropical instability waves, J. Phys. Oceanogr., 25, 2997-3007, 1995. | en |
dc.description.obiettivoSpecifico | 4A. Clima e Oceani | en |
dc.description.journalType | JCR Journal | en |
dc.description.fulltext | restricted | en |
dc.relation.issn | 0148-0227 | en |
dc.contributor.author | Masina, S. | en |
dc.contributor.author | Philander, S. G. H. | en |
dc.contributor.author | Bush, A. B. G. | en |
dc.contributor.department | Istituto di Scienze dell'Atmosfera e dell'Oceano, CNR, Bologna, Italy. | en |
dc.contributor.department | Atmospheric and Oceanic Sciences Program, Princeton University, Princeton, New Jersey | en |
dc.contributor.department | Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta, Canada | en |
item.openairetype | article | - |
item.cerifentitytype | Publications | - |
item.languageiso639-1 | en | - |
item.grantfulltext | restricted | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Bologna, Bologna, Italia | - |
crisitem.author.dept | Atmospheric and Oceanic Sciences Program, Princeton University, Princeton, New Jersey | - |
crisitem.author.dept | Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta, Canada | - |
crisitem.author.orcid | 0000-0001-6273-7065 | - |
crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.classification.parent | 03. Hydrosphere | - |
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