Observed Dispersion Relation of Yanai Waves and 17-Day Tropical Instability Waves in the Pacific Ocean

Shinoda, Toshiaki

doi:10.2151/sola.2010-005

Cited by 14 publications

(19 citation statements)

References 20 publications

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“…These observations are consistent with those reported by Halpern et al [1988] near the equator and by McPhaden [1996] a few degrees north of the equator, both using TAO data. The 17-day TIWs have characteristics similar to Yanai wave [Lyman et al, 2007;Shinoda, 2010] while the 33-day TIWs are associated with the first meridional mode Rossby wave [Lyman et al, 2007].…”

Section: Resultsmentioning

confidence: 96%

Aquarius reveals salinity structure of tropical instability waves

Lee

Lagerloef

Gierach

et al. 2012

Geophysical Research Letters

130

113

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Sea surface salinity (SSS) measurements from the Aquarius/SAC‐D satellite during September–December 2011 provide the first satellite observations of the salinity structure of tropical instability waves (TIWs) in the Pacific. The related SSS anomaly has a magnitude of approximately ±0.5 PSU. Different from sea surface temperature (SST) and sea surface height anomaly (SSHA) where TIW‐related propagating signals are stronger a few degrees away from the equator, the SSS signature of TIWs is largest near the equator in the eastern equatorial Pacific where salty South Pacific water meets the fresher Inter‐tropical Convergence Zone water. The dominant westward propagation speed of SSS near the equator is approximately 1 m/s. This is twice as fast as the 0.5 m/s TIW speed widely reported in the literature, typically from SST and SSHA away from the equator. This difference is attributed to the more dominant 17‐day TIWs near the equator that have a 1 m/s dominant phase speed and the stronger 33‐day TIWs away from the equator that have a 0.5 m/s dominant phase speed. The results demonstrate the important value of Aquarius in studying TIWs.

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Section: Resultsmentioning

confidence: 96%

Aquarius reveals salinity structure of tropical instability waves

Lee

Lagerloef

Gierach

et al. 2012

Geophysical Research Letters

130

113

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“…Virtually all of the identifications of Pacific Ocean inertia-gravity waves mentioned above were for baroclinic mode 1. Using a gridded sea level product made from satellite altimetry data, Shinoda (2010) found relatively elevated power on the oceanic MRG dispersion curves for both baroclinic mode 1 and baroclinic mode 2. This suggests that the more extensive datasets now available may yield evidence of higher baroclinic mode inertia-gravity waves that were not detected previously.…”

Section: Introductionmentioning

confidence: 98%

Wavenumber–Frequency Spectra of Inertia–Gravity and Mixed Rossby–Gravity Waves in the Equatorial Pacific Ocean

Farrar

Durland

2012

Journal of Physical Oceanography

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In the 1970s and 1980s, there was considerable interest in near-equatorial variability at periods of days to weeks associated with oceanic equatorial inertia-gravity waves and mixed Rossby-gravity waves. At that time, the measurements available for studying these waves were much more limited than today: most of the available observations were from scattered island tide gauges and a handful of short mooring records. More than a decade of the extensive modern data record from the Tropical Atmosphere Ocean (TAO)/Triangle Trans-Ocean Buoy Network (TRITON) mooring array in the Pacific Ocean is used to reexamine the internal-wave climate in the equatorial Pacific, with a focus on interpretation of the zonalwavenumber/frequency spectrum of surface dynamic height relative to 500 decibars at periods of 3-15 days and zonal wavelengths exceeding 308 of longitude. To facilitate interpretation of the dynamic height spectrum and identification of equatorial wave modes, the spectrum is decomposed into separate spectra associated with dynamic height fluctuations that are symmetric or antisymmetric about the equator. Many equatorial-wave meridional modes can be identified, for both the first and second baroclinic mode. Zonal-wavenumber/frequency spectra of the zonal and meridional wind stress components are also examined. The observed wind stress spectra are used with linear theory of forced equatorial waves to provide a tentative explanation for the zonal-wavenumber extent of the spectral peaks seen in dynamic height. Examination of the cross-equatorial symmetry properties of the wind stress suggests that virtually all of the large-scale equatorial inertia-gravity and mixed Rossby-gravity waves examined may be sensitive to both zonal and meridional wind stress.

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“…For example, the time and space resolutions of recent satellite altimetry products are substantially improved, and it is now feasible to detect the signals of 10-17 day period SSH variability associated with oceanic equatorial waves, e.g., [6][7][8]. Also, the recent launch of Aquarius/SAC-D satellite enables us to describe subseasonal variability of surface salinity produced by tropical instability waves [9].…”

Section: Introductionmentioning

confidence: 99%

Large-Scale Oceanic Variability Associated with the Madden-Julian Oscillation during the CINDY/DYNAMO Field Campaign from Satellite Observations

et al. 2013

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During the CINDY/DYNAMO field campaign (fall/winter 2011), intensive measurements of the upper ocean, including an array of several surface moorings and ship observations for the area around 75°E-80°E, Equator-10°S, were conducted. In this study, large-scale upper ocean variations surrounding the intensive array during the field campaign are described based on the analysis of satellite-derived data. Surface currents, sea surface height (SSH), sea surface salinity (SSS), surface winds and sea surface temperature (SST) during the CINDY/DYNAMO field campaign derived from satellite observations are analyzed. During the intensive observation period, three active episodes of large-scale convection associated with the Madden-Julian Oscillation (MJO) propagated eastward across the tropical Indian Ocean. Surface westerly winds near the equator were particularly strong during the events in late November and late December, exceeding 10 m/s. These westerlies generated strong eastward jets (>1 m/s) on the equator. Significant remote ocean responses to the equatorial westerlies were observed in both Northern and Southern Hemispheres in the central and eastern Indian Oceans. The anomalous SSH associated with strong eastward jets propagated eastward as an equatorial Kelvin wave and generated OPEN ACCESSRemote Sens. 2013, 5 2073 intense downwelling near the eastern boundary. The anomalous positive SSH then partly propagated westward around 4°S as a reflected equatorial Rossby wave, and it significantly influenced the upper ocean structure in the Seychelles-Chagos thermocline ridge about two months after the last MJO event during the field campaign. For the first time, it is demonstrated that subseasonal SSS variations in the central Indian Ocean can be monitored by Aquarius measurements based on the comparison with in situ observations at three locations. Subseasonal SSS variability in the central Indian Ocean observed by RAMA buoys is explained by large-scale water exchanges between the Arabian Sea and Bay of Bengal through the zonal current variation near the equator.

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Observed Dispersion Relation of Yanai Waves and 17-Day Tropical Instability Waves in the Pacific Ocean

Cited by 14 publications

References 20 publications

Aquarius reveals salinity structure of tropical instability waves

Aquarius reveals salinity structure of tropical instability waves

Wavenumber–Frequency Spectra of Inertia–Gravity and Mixed Rossby–Gravity Waves in the Equatorial Pacific Ocean

Large-Scale Oceanic Variability Associated with the Madden-Julian Oscillation during the CINDY/DYNAMO Field Campaign from Satellite Observations

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