Download or read book Observations and Modelling of Deep Equatorial Currents in the Central Pacific written by Rui Vasques de Melo Ponte and published by . This book was released on 1988 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt: Analysis of vertical profiles of absolute horizontal velocity collected in January 1981, February 1982 and April 1982 in the central equatorial Pacific as part of the Pacific Equatorial Ocean Dynamics (PEQUOD) program, revealed two significant narrow band spectral peaks in the zonal velocity records, centered at vertical wavelengths of 560 and 350 stretched meters (sm). Both signals were present in all three cruises, but the 350 sm peak showed a more steady character in amplitude and a higher signal-to-noise ratio. In addition, its vertical scales corresponded to the scales of the conspicuous alternating flows generically called the equatorial deep jets in the past (the same terminology will be used here). Meridional velocity and vertical displacement spectra did not show any such energetic features. Energy in the 560 sm band roughly doubled between January 1981 and April 1982. Time lagged coherence results suggested upward phase propagation at time scales of about 4 years. East-west phase lines computed from zonally lagged coherences, tilted downward towards the west, implying westward phase propagation. Estimates of zonal wavelength (on the order of 10000 km) and period based on these coherence calculations, and the observed energy meridional structure at this vertical wavenumber band, seem consistent, within experimental errors, with the presence of a first meridional mode long Rossby wave packet, weakly modulated in the zonal direction. The equatorial deep jets, identified with the peak centered at 350 sm, are best defined as a finite narrow band process in vertical wavenumber (311-400 sm), accounting for only 20% of the total variance present in the broad band energetic background. At the jets wavenumber band, latitudinal energy scaling compared well with Kelvin wave theoretical values and a general tilt of phase lines downward towards the east yielded estimates of 10000-16000 km for the zonal wavelengths. Time-lagged coherence calculations revealed evidence for vertical shifting of the jets on interannual time scales. Interpretation of results in terms of single frequency linear wave processes led to inconsistencies, but finite bandwidth (in frequency and wavenumber) Kelvin wave processes of periods on the order of three to five years could account for the observations. Thus, the records do not preclude equatorial waves as a reasonable kinematic description of the jets. At all wavenumber bands in general, power levels decayed away from the equator over scales broader than the Kelvin wave scale, suggesting the presence of Rossby wave energy. Cross-spectral analysis showed Rossby and Kelvin wave motions to be dominant at the equator over the 933 sm and the 140-400 sm vertical wavelength bands, respectively. The latter agrees with the findings of Eriksen (1981) in the western Pacific, and thus seems to be a climatological feature of the deep equatorial Pacific fields. In an attempt to model the observed zonal velocity signals, alternative forcing mechanisms for the deep ocean (other than direct surface winds) were tried. The probable presence of deep energy sources at the ocean side walls (e.g., Kawase, 1987) was explored by considering the linear response of an equatorial ocean to a time varying zonal jet placed at the lateral boundaries. In another simple model, we examined the character of stationary Kelvin wave solutions obtained in the presence of vertically sheared mean westward flows. In this case, the waves are forced below the thermocline by a vertical velocity representing large scale convergence or divergence patterns associated with the upper ocean circulation. Results suggest that both ideas remain potentially important to the existence of deep baroclinic currents in the equatorial ocean.
Download or read book Zonal Jets written by Boris Galperin and published by Cambridge University Press. This book was released on 2019-02-28 with total page 527 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents a comprehensive, multidisciplinary volume on the physics of zonal jets, from the leading experts, for graduate students and researchers.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analysis of a Simulation of the Seasonal Cycle in the Tropical Pacific Ocean in an Eddy resolving Global Ocean Model written by Lawrence Joseph Gordon and published by . This book was released on 1992 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Journal of Physical Oceanography written by and published by . This book was released on 2003-10 with total page 802 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Accuracy of Monitoring the Transports of the Equatorial Currents in the Central Pacific Ocean written by Wayne L. Tang and published by . This book was released on 1986 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ocean Circulation and Climate written by Gerold Siedler and published by Academic Press. This book was released on 2001-04-11 with total page 826 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the views of leading scientists on the knowledge of the global ocean circulation following the completion of the observational phase of the World Ocean Circulation Experiment. WOCE's in situ physical and chemical measurements together with satellite altimetry have produced a data set which provides for development of ocean and coupled ocean-atmosphere circulation models used for understanding ocean and climate variability and projecting climate change. This book guides the reader through the analysis, interpretation, modelling and synthesis of this data.
Download or read book Indices of Equatorial Currents in the Central Pacific written by K. Wyrtki and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ocean Currents written by and published by Elsevier. This book was released on 2014-05-14 with total page 363 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ocean Currents
Download or read book Publications Abstracts written by Environmental Research Laboratories (U.S.) and published by . This book was released on 1994 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Consolidated Translation Survey written by United States. Central Intelligence Agency. Foreign Documents Division and published by . This book was released on 1969-10 with total page 686 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Direct Observations of Deep Water Movement in the Pacific Ocean written by Stanford Research Institute and published by . This book was released on 1961 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: Studies of deep water movements, using neutral buoyancy floats, were carried out in the eastern Pacific in tropical and low northern temperate latitudes. Prior to the present study no float observations had been made in the area of the eastern boundary current off the California coast. An ultimate objective of the reported observations is to aid in understanding the thermohaline circulation of the world ocean; an immediate objective is to begin the determination of characteristics of water movement beneath the southward-drifting, presumably shallow, California current. (Author).
Download or read book High Resolution Numerical Modelling of the Atmosphere and Ocean written by Kevin Hamilton and published by Springer Science & Business Media. This book was released on 2007-12-25 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: This highly relevant text documents the first international meeting focused specifically on high-resolution atmospheric and oceanic modeling. It was held recently at the Earth Simulator Center in Yokohama, Japan. Rather than producing a standard conference proceedings volume, the editors have decided to compose this volume entirely of papers written by invited speakers at the meeting, who report on their most exciting recent results involving high resolution modeling.
Download or read book Cities and Their Vital Systems written by Advisory Committee on Technology and Society and published by National Academies Press. This book was released on 1989 with total page 1298 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cities and Their Vital Systems asks basic questions about the longevity, utility, and nature of urban infrastructures; analyzes how they grow, interact, and change; and asks how, when, and at what cost they should be replaced. Among the topics discussed are problems arising from increasing air travel and airport congestion; the adequacy of water supplies and waste treatment; the impact of new technologies on construction; urban real estate values; and the field of "telematics," the combination of computers and telecommunications that makes money machines and national newspapers possible.
Download or read book Marine Modeling V 6 written by Edward D. Goldberg and published by Harvard University Press. This book was released on 1977-01-31 with total page 1072 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Observational Study of Long Waves in the Equatorial Pacific Ocean During the 1991 1993 El Ni o written by Todd William Sitler and published by . This book was released on 1994 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt: Long waves in the equatorial Pacific Ocean during the 1991-1993 El Nino event were examined using temperature, current, and wind time series from the Tropical Oceans-Global Atmosphere Tropical Atmosphere-Ocean (TOGA-TAO) moored buoy array. Numerous episodes of long wave activity were detected. The most prominent episodes were associated with eastward propagating equatorial Kelvin waves and with westward propagating tropical instability waves and mixed Rossby-gravity waves. Equatorial Kelvin waves, which were generated by westerly wind events in the western and central Pacific, were evident in the data between 2 deg N to 5 deg S and from 170 deg W to 110 deg W. These Kelvin waves, which were most pronounced from 75 to 300 m, had periods of 40 to 70 days, eastward phase speeds of 1.9 to 6.5 m/s, and zonal wavelengths on the order of 10,000 km. These waves were most evident in the northern hemisphere fall and winter. The period of greatest Kelvin wave activity was August 1991 -May 1992, during the peak phase of the 1991-1993 El Nino event.
Download or read book El Nino La Nina and the Southern Oscillation written by S. George Philander and published by Academic Press. This book was released on 1989-12-14 with total page 309 pages. Available in PDF, EPUB and Kindle. Book excerpt: El Nino and the Southern Oscillation is by far the most striking phenomenon caused by the interplay of ocean and atmosphere. It can be explained neither in strictly oceanographic nor strictly meteorological terms. This volume provides a brief history of the subject, summarizes the oceanographic and meteorological observations and theories, and discusses the recent advances in computer modeling studies of the phenomenon. Includes a comprehensive and up-to-date research survey Discusses in detail sophisticated computer models Provides a clear exposition of the major problems which prevent more accurate predictions of El Nino
