Indian Ocean Rossby waves detected in HYCOM sea surface salinity

Heffner, David M.; Subrahmanyam, Bulusu; Shriver, Jay F.

doi:10.1029/2007gl032760

Cited by 18 publications

(29 citation statements)

References 23 publications

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“…Some of these anomalies have been identified as Rossby waves (see L'Hegaret et al, 2013) with a wave speed of c = −βR 2 d of 21 cm s −1 and with a wavelength of about 210 km. These waves have also been observed more southwards by Heffner et al (2008). The Hovmoller diagrams from both AVISO and HYCOM point out the strong reversal of positive and negative anomalies along the eastern side of the basin followed by wave emission.…”

Section: Rossby Wavesmentioning

confidence: 84%

“…1 for geographical locations and bathymetry). Observations show that the annual mean outflow transport of PGW through the strait is about 0.25 Sv, with little seasonal variation in transport (see Matsuyama et al, 1998, andJohns et al, 2000). But this transport can be affected by short-term pulses related to the effect of oceanic cyclones in the Persian Gulf (see Thoppil and Hogan, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…The net evaporation-precipitation budget is large and positive in the Persian Gulf and in the Red Sea. This leads to the generation of water masses with very high salinities (above 40 psu) in these two basins (see Yao andJohns, 2010a, b, andBower et al, 2000). The present article focuses on the saline water flowing out of the Persian Gulf.…”

Section: Introductionmentioning

confidence: 99%

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Mesoscale variability in the Arabian Sea from HYCOM model results and observations: impact on the Persian Gulf Water path

L’Hégaret

Duarte²,

Carton

et al. 2015

Ocean Sci.

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Abstract. The Arabian Sea and Sea of Oman circulation and water masses, subject to monsoon forcing, reveal a strong seasonal variability and intense mesoscale features. We describe and analyze this variability and these features, using both meteorological data (from ECMWF reanalyses), in situ observations (from the ARGO float program and the GDEM -Generalized Digital Environmental mode -climatology), satellite altimetry (from AVISO) and a regional simulation with a primitive equation model (HYCOM -the Hybrid Coordinate Ocean Model). The model and observations display comparable variability, and the model is then used to analyze the three-dimensional structure of eddies and water masses with higher temporal and spatial resolutions than the available observations. The mesoscale features are highly seasonal, with the formation of coastal currents, destabilizing into eddies, or the radiation of Rossby waves from the Indian coast. The mesoscale eddies have a deep dynamical influence and strongly drive the water masses at depth. In particular, in the Sea of Oman, the Persian Gulf Water presents several offshore ejection sites and a complex recirculation, depending on the mesoscale eddies. The associated mechanisms range from coastal ejection via dipoles, alongshore pulses due to a cyclonic eddy, to the formation of lee eddies downstream of Ra's Al Hamra. This water mass is also captured inside the eddies via several mechanisms, keeping high thermohaline characteristics in the Arabian Sea. The variations of the outflow characteristics near the Strait of Hormuz are compared with variations downstream.

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Section: Rossby Wavesmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

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Mesoscale variability in the Arabian Sea from HYCOM model results and observations: impact on the Persian Gulf Water path

L’Hégaret

Duarte²,

Carton

et al. 2015

Ocean Sci.

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“…In this study, we use the same version of the model used by Heffner et al (2008) and Subrahmanyam et al (2009Subrahmanyam et al ( ) over the 2003Subrahmanyam et al ( -2006 period. It uses global HYCOM simulations with a daily temporal resolution, a 1/12 • horizontal resolution (∼7 km at mid-latitudes), and 32 hybrid vertical layers.…”

Section: Hybrid Coordinate Ocean Modelmentioning

confidence: 99%

Altimetric Observations and Model Simulations of Coastal Kelvin Waves in the Bay of Bengal

2012

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in the tropical Indian Ocean reveal dominant annual Kelvin waves in the equatorial wave guide and dominant semiannual Kelvin waves off Sumatra coast and along the coastal Bay of Bengal. This study reveals variability in the propagation of upwelling Kelvin wave during winter and summer monsoons and downwelling Kelvin wave during monsoon transitions. Further, the winter transition downwelling Kelvin wave largely affects the coastal circulation of India.

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“…1). The choice of RoSSSby was influenced by the studies of Rossby waves in SSS in ocean models (Heffner et al, 2008;Subrahmanyam et al, 2009) and from Aquarius (Menezes et al, 2014).…”

Section: Datamentioning

confidence: 99%

Reduced ascending/descending pass bias in SMOS salinity data demonstrated by observing westward-propagating features in the South Indian Ocean

Banks

Srokosz

Cipollini

et al. 2016

Remote Sensing of Environment

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a b s t r a c tThe European Space Agency (ESA) Soil Moisture and Ocean Salinity (SMOS) satellite has been providing data, including sea surface salinity (SSS) measurements, for more than five years. However, the operational ESA Level 2 SSS data are known to have significant spatially and temporally varying biases between measurements from ascending passes (SSS A ) and measurements from descending passes (SSS D ). This paper demonstrates how these biases are reduced through the use of SSS anomalies. Climatology products are constructed using SMOS Level 2 data to provide daily, one-degree by one-degree climatologies separately for ascending and descending passes using a moving window approach (in time and space). The daily, one-degree products can then be averaged to provide values of climatological SSS at different spatial and/or temporal resolutions.The averaged values of the SMOS climatology products are in good general agreement with data from the World Ocean Atlas 2013. However, there are significant differences at high latitudes, as well as in coastal and dynamic regions, as found by previous studies. Both the mean and standard deviation of the differences between data from ascending passes and data from descending passes for the anomalies are reduced compared with those obtained using the original salinity values. Geophysical signals are clearly visible in the anomaly products and an example is shown in the Southern Indian Ocean of westward-propagating signals that we conclude represent the surface expression of Rossby waves or large-scale non-linear eddies. The signals seen in salinity data agree (in speed) with those from sea surface temperature and sea surface height and are consistent with previous studies.

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Indian Ocean Rossby waves detected in HYCOM sea surface salinity

Cited by 18 publications

References 23 publications

Mesoscale variability in the Arabian Sea from HYCOM model results and observations: impact on the Persian Gulf Water path

Mesoscale variability in the Arabian Sea from HYCOM model results and observations: impact on the Persian Gulf Water path

Altimetric Observations and Model Simulations of Coastal Kelvin Waves in the Bay of Bengal

Reduced ascending/descending pass bias in SMOS salinity data demonstrated by observing westward-propagating features in the South Indian Ocean

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