Southwestward extent of chlorophyll-enriched waters from the Peruvian and equatorial upwellings between Tahiti and Panama

Dandonneau, Yves; Eldin, Gérard

doi:10.3354/meps038283

Cited by 13 publications

(5 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Around 150 m the high-salinity tongue originating from South Pacific subtropical waters (Figure 4b (Figure 4e). This transition from an oligotrophic regime to a mesotrophic one has been previously described in the area between 130 ø and 140øW, where its latitude varied between 10 ø and 14øS [ Dandonneau and Eldin, 1987].…”

Section: Vertical Physical and Biogeochemical Structuressupporting

confidence: 79%

The coupled physical‐new production system in the equatorial Pacific during the 1992–1995 El Niño

Stoens¹,

Menkès²,

Radenac³

et al. 1999

J. Geophys. Res.

View full text Add to dashboard Cite

Section: Vertical Physical and Biogeochemical Structuressupporting

confidence: 79%

The coupled physical‐new production system in the equatorial Pacific during the 1992–1995 El Niño

Stoens¹,

Menkès²,

Radenac³

et al. 1999

J. Geophys. Res.

View full text Add to dashboard Cite

“…-we fixed the limit between the 'Pacific North Equatorial Current' (PNEC) and the 'Pacific Equatorial Divergence' (PEQD) provinces at 2°N, instead of 5°N, basing it on a higher sea surface temperature (SST) which characterizes PNEC and extends as far southward as 2°N, -we extended PEQD farther south than 5°S, as suggested by relatively high chlorophyll and nutrient concentrations and CO 2 partial pressure southward to 12°S (Dandonneau and Eldin, 1987;Dandonneau, 1995), -we discarded the region between 12°S and 16°S, which is episodically influenced by the equatorial upwelling (Dandonneau and Eldin, 1987) or by the Tahiti island mass and thus is not always subject to the oligotrophic regime that prevails in the 'South Pacific Subtropical Gyre Province' (SPSG), -similarly, we discarded the region of SPSG south of 30°S, where perturbations of oceanic currents induced by New Zealand islands and vertical mixing consecutive to winter cooling give different conditions to that of SPSG.…”

Section: Resultsmentioning

confidence: 99%

Temporal variability in phytoplankton pigments, picoplankton and coccolithophores along a transect through the North Atlantic and tropical southwestern Pacific

Dandonneau

Montel

Blanchot

et al. 2006

Deep Sea Research Part I: Oceanographic Research Papers

View full text Add to dashboard Cite

International audienceBiogeochemical processes in the sea are triggered in various ways by chlorophyll-containing phytoplankton groups. While the variability of chlorophyll concentration at sea has been observed from satellites for several years, these groups are known only from cruises which are limited in space and time. The Geochemistry, Phytoplankton and Color of the Ocean programme (GeP&CO) was set up to describe and understand the variability of phytoplankton composition on large spatial scales under a multi-year sampling strategy. It was based on sea-surface sampling along the route of the merchant ship Contship London which travelled four times a year from Le Havre (France) to Noumea (New Caledonia) via New York, Panama and Auckland. Observations included the measurement of photosynthetic pigments, counts of picoplanktonic cells by flow cytometry (Prochlorococcus, Synechococcus, and picoeucaryotes) and counting and identification of coccolithophores. The results confirmed that tropical areas have low seasonal variability and are characterized by relatively high divinyl-chlorophyll a and zeaxanthin concentration and that the variability is strongest at high latitudes-where the phytoplankton biomass and population structure are found to have large seasonal cycles. Thus, the spring bloom in the North Atlantic and an austral winter bloom north of New Zealand are marked by chlorophyll concentrations which are often higher than 0.5 mu g l(-1) and by high concentration of fucoxanthin (a pigment used as an indicator for diatoms), while summer populations are dominated by Prochlorococcus sp. and have low chlorophyll concentrations. Apart from this yearly bloom at temperate latitudes, fucoxanthin is scarce, except in the equatorial upwelling zone in the eastern Pacific Ocean, where it is found in moderate amounts. In this region, relatively high chlorophyll concentrations extend generally as far as 14 degrees S and do not respond to the seasonal strengthening of the equatorial upwelling during the austral winter. Prochlorococcus, which is known to dominate in oligotrophic tropical seas and to disappear in cold conditions, in fact has its minimum during the spring bloom in the North Atlantic, rather than during the winter. Coccolithophores are ubiquitous, showing a succession of species ill response to oceanic conditions and provinces. 19'Hexanoyloxyfucoxanthin, the pigment generally considered as all indicator of coccolithophores, is relatively abundant at all times and in all regions, but its abundance is generally not tightly correlated with that of coccolithophores. The regional differences revealed by these results are in overall agreement with Longhurst's division of the ocean into ecological provinces. (c) 2006 Elsevier Ltd. All rights reserved

show abstract

“…The correlation between POC and latitude could reflect the influence of equatorial upwelling. Indeed, Dandonneau & Eldin (1987) considered that the position of the transition between the waters deriving from the Peruvian and equatorial upwellings, and the oligotrophic waters of the central Pacific varies between 5 and 17"s. These authors used sea-surface chlorophyll sampling carried out by merchant ships on the Tahiti-Panama track. Between December 1979 and September 1985, the Tuamotu atolls were observed to be reached by the upwelling-derived waters on 1 4 % of the 118 transects.…”

Section: Tatu Expeditionmentioning

confidence: 99%

Particulate organic matter in sixteen Tuamotu atoll lagoons (French Polynesia)

Charpy¹,

Dufour²,

Garcia³

1997

Mar. Ecol. Prog. Ser.

View full text Add to dashboard Cite

ABSTRACT. The s t a n d~n g stock and chemical composition of suspended particles were monitored In 16 Tuamotu atoll lagoons and surrounding oceanic water between 1983 and 1996 Temporal and spatial variability was estimated from 18 surveys performed in Takapoto. Atoll lagoon partlculate organic matter (POM) concentrations were compared using data taken during the same months (March and November) and at the same time (morning). It appears that the lagoonal particulate organic carbon concentration depends on the latltude of each lagoon. We interpret this result as a n influence of the waters deriving from the Peruvian and equatorial upwellings. Phytoplankton biomass (chlorophyll) concentration was inversely related to the water exchange between lagoon and ocean. Therefore, the best atolls for pearl oyster farming seem to be those located north of the Tuamotu Archipelago and with snlall exchange with the occan. POM concentration cvas 2 to 5 tunes higher in the atoll lagoons than in the surrounding oceanlc water, wlth a hlgher C:N ratio and a lower N:P ratio. The small size of organic particles (70'% < 3 pm) and the low contl-ibution of phytoplankton to particulate organlc carbon (POC) (S to 19%) in the lagoons must be taken into account when calculating the potential of pearl oysters, which cannot exceed the nutritional potential of Tuamotu atoll lagoons.

show abstract

Southwestward extent of chlorophyll-enriched waters from the Peruvian and equatorial upwellings between Tahiti and Panama

Cited by 13 publications

References 16 publications

The coupled physical‐new production system in the equatorial Pacific during the 1992–1995 El Niño

The coupled physical‐new production system in the equatorial Pacific during the 1992–1995 El Niño

Temporal variability in phytoplankton pigments, picoplankton and coccolithophores along a transect through the North Atlantic and tropical southwestern Pacific

Particulate organic matter in sixteen Tuamotu atoll lagoons (French Polynesia)

Contact Info

Product

Resources

About