Interannual correlations between sea level difference at the south coast of Japan and wind stress over the north pacific

Kutsuwada, Kunio

doi:10.1007/bf02303122

Cited by 7 publications

(4 citation statements)

References 18 publications

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“…The spatial coherence covers the subtropical and subarctic areas as well as the tropical area. This is consistent with the results of Kutsuwada (1988bKutsuwada ( , 1990, who showed that there are signals with a period of 3-4 years in the western portions of the subtropical and subarctic gyres. It is considered that EN-period variations are related to global-scale features of the ENSO variability.…”

Section: Discussionsupporting

confidence: 92%

Quasi-Periodic Variabilities of Wind-Stress Fields over the Pacific Ocean Related to ENSO Events

Kutsuwada

1991

Journal of the Meteorological Society of Japan

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Two datasets of monthly-mean wind stress, estimated from Ships-of-Opportunity data covering the North Pacific (O*-50*N) and the Pacific trade wind region (30*S-30*N), are used to describe the spatial character of interannual variability. Two characteristic time scales related to the occurrence of ENSO events are given by period bands around 3.6 years (EN) and 2 years (QB), being associated with spectral peaks found in sea surface temperature (SST) in the eastern equatorial Pacific area. Spatial features of wind stress variations in the two period bands are described by patterns derived from correlations between SST in the area and the zonal and meridional components of the wind stress in the datasets.The variation in the EN-band around 3.6 years is coherent over a large portion of the study areas covering the extratropics as well as the tropics and has a Pacific-basin scale. The wind stress pattern in the maximum phase of the SST corresponding to the peak phase of an El Nino event has not only symmetric features, such as westerly anomalies near the equator, but also asymmetric features such as easterly anomalies covering the western porion north of the equator. These spatial features are similar to those in composite fields for the peak phase of El Nino events, which suggests that the EN-period variation is a principal element in ENSO variability. On the other hand, the variation in the QB-band around 2 years is dominant in the tropical area, especially in the western portion north of the equator, being incoherent over most of the study areas. It is suggested that the QB-period variation is characteristic of the tropical zone covering the Indian Ocean and that its phase relationship with the EN-period variation is important for the occurrence of ENSO events.

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Section: Discussionsupporting

confidence: 92%

Quasi-Periodic Variabilities of Wind-Stress Fields over the Pacific Ocean Related to ENSO Events

Kutsuwada

1991

Journal of the Meteorological Society of Japan

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“…Wind stress curl forcing with periods above 300 days generates large‐scale baroclinic Rossby waves [ Willebrand et al , 1980; Pierini , 1998]. Both of these relationships between the wind stress curl and WBC flow have been confirmed by observations [ Moore and Wilkin , 1998; Sturges and Hong , 2001; Lee et al , 1996; Kutsuwada , 1988].…”

Section: Introductionmentioning

confidence: 81%

“…Care must be taken in the southern site, where the correlation is borderline significant at best and where AWS might be the forcing behind it. References to an interannual signal relating the interior Sverdrup transport to WBC flows, as observed in the north location, also exist but are less abundant [ Kutsuwada , 1988]. An immediate explanation is the paucity of long‐term records.…”

Section: Discussionmentioning

confidence: 99%

Deep variability in the Atlantic Western Boundary Current based on altimetric and expendable bathythermograph data

Montenegro¹,

Weatherly²

2007

J. Geophys. Res.

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[1] The deep variability in two areas of the Atlantic Western Boundary is studied. One site is located at 38°N, inshore of the Gulf Stream. The other is at 8°S, off the Brazilian coast. Analyses are centered on current time series estimated by a method that uses expendable bathythermograph derived dynamic heights to remove the near-surface signal from altimetric sea surface height. Both series are approximately 6 years long. Currents are compared to scatterometer derived alongshore wind stress and basin-wide wind stress curl. In both areas, current variability is correlated to basin-averaged wind stress curl and also to alongshore wind stress. The relationship between currents and wind curl is coherent with the western boundary currents response to interior Sverdrup flow. We propose that alongshore wind stress exerts control over the flow by divergence of the Ekman flow at the coast. In the north, the variability is dominated by interannual oscillations of the wind curl. The effects of the alongshore stress are secondary and have annual frequency. In the southern site, the alongshore effect appears to be the dominant forcing. The main observed results are confirmed by data from a numerical model with 1/6°horizontal resolution.

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“…It can be easily imagined an importance of a baroclinic mechanism for interannual variation of the Kuroshio because of the long time scale of a baroclinic response. However, Kutsuwada (1988) pointed out that interannual variation in sea level difference across the Tokara Strait is coherent with that of the zonally-integrated Sverdrup transport in the latitudinal zone along 30°N. His result suggests that the interannual variation of the Kuroshio transport at the Tokara Strait can be explained by the barotropic response to the wind stress.…”

Section: Summary and Discussionmentioning

confidence: 96%

Mechanism of the seasonal transport variation through the Tokara Strait

1995

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To investigate a mechanism of the seasonal variation of transport through the Tokara Strait, two numerical experiments with real geometry and wind forcing were carried out. The models are linear barotropic models which are a North Pacific Ocean model and a limited-area model with a fine grid. The seasonal variation of volume transport with a maximum in the summer and a minimum in the autumn could be well reproduced by both models. The results demonstrate the wind stress component normal to a gradient vector of bottom topography is crucial for determining the seasonal variation. The similar seasonal variation widely covers the East China Sea and has a large amplitude near the Tokara Strait. Finally, it can be concluded that winds north of 35°N have little influence on the seasonal response of our model at the Tokara Strait.

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Interannual correlations between sea level difference at the south coast of Japan and wind stress over the north pacific

Cited by 7 publications

References 18 publications

Quasi-Periodic Variabilities of Wind-Stress Fields over the Pacific Ocean Related to ENSO Events

Quasi-Periodic Variabilities of Wind-Stress Fields over the Pacific Ocean Related to ENSO Events

Deep variability in the Atlantic Western Boundary Current based on altimetric and expendable bathythermograph data

Mechanism of the seasonal transport variation through the Tokara Strait

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