Flow path of the Antarctic Intermediate Water in the western equatorial South Pacific Ocean

Tsuchiya, Mizuki

doi:10.1016/s0198-0149(12)80013-6

Cited by 79 publications

(77 citation statements)

References 7 publications

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“…A flow of circumpolar water into the eastern South Pacifc was identified by 'Wooster and Reid (1963), and a follow-on (via the SEC) circulation of intermediate water from the South to North Pacific in the west was suggested early on by Reid (1965); see in addition Reid and Mantyla (1978). According to Tsuchiya (1991), intermediate water from the western South Pacific also feeds the Equatorial Current System (but then what? ).…”

Section: °170°120°130°140°160°110°fmentioning

confidence: 99%

On the world ocean circulation. Volume II, the Pacific and Indian Oceans/a global update

Schmitz¹

1996

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Section: °170°120°130°140°160°110°fmentioning

confidence: 99%

On the world ocean circulation. Volume II, the Pacific and Indian Oceans/a global update

Schmitz¹

1996

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“…The cause of Si limitation in the equatorial Pacific is to be found far to the south, in the Southern Ocean where SubAntarctic Mode Water (SAMW), the source water for the NGCUC, is formed at and to the north of the Polar Front (PF) (Tsuchiya, 1991). Although it has been known for some time that surface waters north of the PF are low in Si(OH) 4 but high in NO 3 (Broecker and Peng, 1982), the process resulting in this distribution has only become clear recently from JGOFS studies of the US and other countries, especially of France.…”

Section: The Significance and Cause Of Low Source Si(oh) 4 Concentratmentioning

confidence: 99%

Sources and fates of silicon in the ocean: the role of diatoms in the climate and glacial cycles

Dugdale

Wilkerson

2001

Sci. Mar.

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INTRODUCTIONThe biogeochemistry of silicon (Si) is the focus of considerable contemporary attention by geochemists, paleoceanographers and paleoclimatologists. Biologists are showing revived interest in the Si cycle in relation to diatom productivity as it's very strong role in marine productivity (e.g. Smetacek, 1999) and effect on ocean-atmosphere processes becomes apparent, following a period in which the focus was almost exclusively on smaller and smaller planktonic organisms. The objective of this communication is to review the role of biological processes in the formation of the ocean Si environment first at the broad scale and then in more detail in two special settings, the equatorial Pacific and the Southern Ocean. In doing so, we will follow the evolution of a set of nitrogen (N) based models, that conclude with inclusion of Si and it's impact on global carbon cycles and paleoclimatology. We will examine the differences between the oceanic Si and N cycle, the existence of areas of unusually low silicate relative to nitrate concentrations and how we think they are formed. The concept of the Pacific equatorial upwelling area as a Si limited chemostatlike system and the model complexity necessary to describe its functioning will be presented. SUMMARY: Diatoms with their fast growth rates and obligate requirement for Si have a unique relationship to the oceanic Si cycle with the potential for controlling the nutrient and CO 2 environment of large important areas of the ocean. The new production of diatoms based on both new nitrogen and Si sources is described using a Si-pump based upon the differential regeneration of the two elements. This approach, applied to the eastern equatorial Pacific, showed diatoms to respond as in a Si-limited chemostat, to the low source Si(OH) 4 in the Equatorial UnderCurrent. Increased Si(OH) 4 results in increased diatom productivity, suppression of non-diatom populations and decreased surface pCO 2 . The deficiency in source concentrations of Si(OH) 4 results from low Si(OH) 4 :NO 3 water originating in the vicinity of the Antarctic Polar Front, a consequence of the extraordinary trapping of Si by the Southern Ocean. In glacial periods this trapping is reduced several fold and likely results in increased Si(OH) 4 export to the north, and increased Si(OH) 4 production and deposition at the equatorial Pacific which can be expected to reduce surface pCO 2 . The connections between the eastern equatorial Pacific export production and Southern Ocean Si trapping may provide a major biogeochemical feedback system with implications for contemporary and paleoclimatology.

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“…Bingham (1993) deduces that the lower reaches of the MC carry NPIW into the Celebes Sea. At deeper depths, Tsuchiya (1991) associates higher oxygen and phosphate levels against the coast as an indicator of AAIW influence spreading northward, having crossed the equator to the m south. The variability of the geostrophic velocity field has made it difficult to observe the mean flow (if any) that may be responsible for this tracer distribution.…”

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confidence: 94%

“…In the west, along the boundary, however, phosphate concentrations decrease in the minimum, and oxygen concentrations increase. Tsuchiya (1991) …”

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confidence: 99%

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Exchanges between hemispheres and gyres : a direct approach to the mean circulation of the equatorial Pacific

Wijffels¹

1993

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Flow path of the Antarctic Intermediate Water in the western equatorial South Pacific Ocean

Cited by 79 publications

References 7 publications

On the world ocean circulation. Volume II, the Pacific and Indian Oceans/a global update

On the world ocean circulation. Volume II, the Pacific and Indian Oceans/a global update

Sources and fates of silicon in the ocean: the role of diatoms in the climate and glacial cycles

Exchanges between hemispheres and gyres : a direct approach to the mean circulation of the equatorial Pacific

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