Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/8952
DC Field | Value | Language |
---|---|---|
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.date.accessioned | 2014-02-27T07:46:28Z | en |
dc.date.available | 2014-02-27T07:46:28Z | en |
dc.date.issued | 1999-12-15 | en |
dc.identifier.uri | http://hdl.handle.net/2122/8952 | en |
dc.description.abstract | Unstable oscillations confined within the mixed layer close to the equator are generated in wind-forced experiments performed in a multilevel general circulation model configured for the tropical Pacific Ocean. The experiments indicate that the waves develop preferentially in the eastern Pacific along the northern temperature front. However, there is clear evidence of a second unstable region along the southern temperature front in the central Pacific. In both regions the instabilities propagate westward, but in the central Pacific their phase speed is considerably smaller. The differences between the wave characteristics in the eastern and central Pacific are closely correlated to the differences in the time mean conditions of the flow. The eastern instabilities have a structure with two peaks in amplitude: one located on the equator and the other a few degrees north of it. Their dispersion characteristics show many similarities to those of tropical instability waves (TIWs) observed in the Pacific Ocean, while the instabilities which grow in the central Pacific do not have any known observed correspondents. We explore the spatial variability of the simulated waves through a wavelet analysis, which provides detailed results on how the period and wavelength of the instabilities change as a function of longitude, latitude, and depth. The wavelet analysis reveals that in the eastern Pacific and close to the surface the TIWs have a phase speed of-48 cm/s, while in the central Pacific they have a phase speed of-11 cm/s. In particular, the change in the phase speed is due to a change in the dominant period of the TIWs: The period of the central Pacific instabilities is considerably longer than the period of the instabilities present in the eastern Pacific. | en |
dc.description.sponsorship | This work was supported by the Department of Commerce/NOAA grant NA56GP0026. One of the authors (SM) was partially supported by a NASA Global Change Fellowship NGT-30288. | 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.title | An analysis of tropical instability waves in a numerical model of the Pacific Ocean - 1. Spatial variability of the waves | en |
dc.type | article | en |
dc.description.status | Published | en |
dc.type.QualityControl | Peer-reviewed | en |
dc.description.pagenumber | 29613-29635 | en |
dc.subject.INGV | 03. Hydrosphere::03.01. General::03.01.01. Analytical and numerical modeling | en |
dc.identifier.doi | 10.1029/1999JC900227 | en |
dc.relation.references | Bryan, K., and M.D. Cox, A numerical investigation of the ocean general circulation, Tellus, 19, 54-80, 1967. Combes, J.M., .A. Grossmann, and P. Tchamitchian, Wave- lets: Time-Frequency Methods and Phase Space, 315 pp., Springer-Verlag, New York, 1989. Cox, M.D., Generation and propagation of 30-day waves in a numerical model of the Pacific, J. Phys. Oceanogr., 10, 1168-1186, 1980. Cox, M.D., A primitive equation, 3-dimensional model of the ocean, Ocean Group Tech. Rep. 1, 143 pp., Geophys. Fluid Dyn. Lab., Princeton, N.J., 1984. Eriksen, C.C., and J.G. Richman, An estimate of equatorial wave energy flux at 9- to 90-day periods in the central Pacific, J. Geophys. Res., 93, 15,455-15,466, 1988. Farge, M., Wavelet transform and their application to tur- bulence, Ann. Rev. Fluid Mech., 2•, 395-457, 1992. Halpern, D., Detection of 17.5-day period meridional current oscillations in the equatorial western Pacific Ocean during 1985, Geophys. Res. Left., 16, 499-502, 1989. Halpern, D., R.A. Knox, and D.S. Luther, Observations of 20-day period meridional current oscillations in the upper ocean along the Pacific equator, J. Phys. Oceanogr., 18, 1514-1534, 1988. Kuroda, Y., and M.J. McPhaden, Variability in the west- ern equatorial Pacific Ocean during japanese Pacific cli- mate study cruises in 1989 and 1990, J. Geophys. Res., 98, 4747-4759, 1993. Legeckis, R., Long waves in the eastern equatorial Pacific Ocean: A view from a geostationary satellite, Science, 197, 1179-1181, 1977. Levitus, S., Climatological atlas of the world ocean, NOAA Prof. Pap. 13, U.S. Govt. Print. Office, Wash- ington D.C., 1982. Masina, S., Tropical instability waves in the Pacific Ocean, Ph.D. thesis, 242 pp., Princeton Univ., Princeton, N.J., 1996. Masina, S., S.G.H. Philander, and A.B.G. Bush, An analysis of tropical instability waves in a numerical model of the Pacific Ocean, 2, Generation and energetics of the waves, J. Geophys. Res., this issue. McCreary, J.P., Jr, and Z. Yu, Equatorial dynamics in a 2•-layer model, Prog. Oceanogr., 29, 61-132, 1992. McPhaden, M.J., Monthly period oscillations in the Pacific North Equatorial Countercurrent, J. Geophys. Res., 101, 6337-6359, 1996. McPhaden, M.J., and B.A. Taft, Dynamics of seasonal and intraseasonal variability in the eastern equatorial Pacific, J. Phys. Oceanogr., 18, 1713-1732, 1988. Meyers, S.D., B.G. Kelly, and J.J. O'Brien, An introduc- tion to wavelet analysis in oceanography and meteorol- ogy: With application to dispersion of Yanai waves, Mon. Weather Rev., 121, 2858-2866, 1993. Orlanski I., Localized baroclinicity: A source for meso-c, cyclones, J. Atmos. Sci., •3, 2857-2885, 1986. Orlanski I., and M.D. Cox, Baroclinic instability in ocean currents, Geophys. Fluid Dy., •, 297-332, 1973. Pacanowski, R.C., Effect of equatorial currents on surface stress, J. Phys. Oceanogr., 11, 1443-1451, 1987. Pacanowski, R.C., and S.G.H. Philander, Parameterization of vertical mixing in numerical models of tropical oceans, J. Phys. Oceanogr., 11, 1443-1451, 1981. Pacanowski, R., K. Dixon, and A. Rosati, The G.F.D.L. modular ocean model users guide, Ocean Group Tech. Rep. 2, 1993. 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, 1978a. Philander, S.G.H., Forced oceanic waves, Rev. Geophys., 16, 15-46, 1978b. Philander, S.G.H., Equatorial waves in the presence of the equatorial undercurrent, J. Phys. Oceanogr., 9, 254-262, 1979. Philander, S.G.H., and R.C. Pacanowski, A model of the seasonal cycle in the tropical Atlantic Ocean, J. Geophys. Res., 91, 14,192-14,206, 1986. Philander, S.G.H., D. Halpern, D. Hansen, R. Legeckis, L.Miller, C. Paul, R. Watts, R. Weisberg, and M. Wim- bush, Long waves in the equatorial Pacific Ocean, Eos Trans. A GU, 66, 14, 154-156, 1985. Philander, S.G.H., W.J. Hurlin, and R.C. Pacanowski, Prop- erties of long equatorial waves in models of the seasonal cycle in the tropical Atlantic and Pacific Oceans, J. Geo- phys. Res., 91, 14,207-14,211, 1986. Philander, S.G.H., W.J. Hurlin and R.C. Pacanowski, Ini- tial condition for a general circulation model of tropical oceans, J. Phys. Oceanogr., 17, 147-157, 1987. 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. Rioul, O., and M. Vetterli, Wavelets and signal processing, IEEE Signal Process. Mag., 14-38, 1991. Schopf, P.S., and M.A. Cane, On equatorial dynamics, mixed layer physics and sea surface temperature, J. Phys. Oceanogr., 13, 917-935, 1983. Seigel, A.D., A comment on long waves in the Pacific Ocean, J. Phys. Oceanogr., 15, 1881-1883, 1985. Semtner, A.J., Jr, and W.R. Holland, Numerical simulation of equatorial ocean circulation, I, A basic case in turbulent 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. Weisberg, R.H., and A.M. Horigan, Low-frequency variabil- ity in the equatorial Atlantic, J. Phys. Oceanogr., 11, 913- 920, 1981. Weisberg, R.H., A. Horigan, and C. Colin, Equatorially trapped Rossby-gravity wave propagation in the Gulf of Guinea, J. Mar. Res., 37, 67-86, 1979. 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.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 |
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.orcid | 0000-0001-6273-7065 | - |
crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.classification.parent | 03. Hydrosphere | - |
Appears in Collections: | Article published / in press |
Files in This Item:
File | Description | Size | Format | Existing users please Login |
---|---|---|---|---|
Masina_and_Philander_1_1999.pdf | main article | 5.01 MB | Adobe PDF |
WEB OF SCIENCETM
Citations
27
checked on Feb 10, 2021
Page view(s) 10
322
checked on Apr 24, 2024
Download(s) 50
84
checked on Apr 24, 2024