Particle fluxes at sediment traps AU9701, south of Australia


Autoria(s): Trull, Tom W; Bray, S; Manganini, Steven J; Honjo, Susumu; Francois, Roger
Cobertura

MEDIAN LATITUDE: -50.505567 * MEDIAN LONGITUDE: 141.850000 * SOUTH-BOUND LATITUDE: -53.750000 * WEST-BOUND LONGITUDE: 141.733300 * NORTH-BOUND LATITUDE: -46.766700 * EAST-BOUND LONGITUDE: 142.066700 * DATE/TIME START: 1997-09-21T00:00:00 * DATE/TIME END: 1998-02-17T00:00:00

Data(s)

04/09/2001

Resumo

Sediment trap moorings were deployed from September 21, 1997 through February 21, 1998 at three locations south of Australia along 140°E: at -47°S in the central Subantarctic Zone (SAZ) with traps at 1060, 2050, and 3850 m depth, at -51°S in the Subantarctic Front with one trap at 3080 m, and at -54°S in the Polar Frontal Zone (PFZ) with traps at 830 and 1580 m. Particle fluxes were high at all the sites (18-32 g/m**2/yr total mass and 0.5-1.4 g organic carbon/m**2/yr at -1000 m, assuming minimal flux outside the sampled summer period). These values are similar to other Southern Ocean results and to the median estimated for the global ocean by Lampitt and Antia [1997], and emphasize that the Southern Ocean exports considerable carbon to the deep sea despite its 'high-nutrient, low chlorophyll' characteristics. The SAZ site was dominated by carbonate (>50% of total mass) and the PFZ site by biogenic silica (>50% of total mass). Both sites exhibited high export in spring and late summer, with an intervening low flux period in December. For the 153 day collection period, particulate organic carbon export was somewhat higher in all the traps in the SAZ (range 0.57-0.84 gC/m**2) than in the PFZ (range 0.31-0.53), with an intermediate value observed at the SAF (0.60). The fraction of surface organic carbon export (estimated from seasonal nutrient depletion, Lourey and Trull [2001]) reaching 1000 m was indistinguishable in the SAZ and PFZ, despite different algal communities.

Formato

application/zip, 3 datasets

Identificador

https://doi.pangaea.de/10.1594/PANGAEA.788177

doi:10.1594/PANGAEA.788177

Idioma(s)

en

Publicador

PANGAEA

Direitos

CC-BY: Creative Commons Attribution 3.0 Unported

Access constraints: unrestricted

Fonte

Supplement to: Trull, Tom W; Bray, S; Manganini, Steven J; Honjo, Susumu; Francois, Roger (2001): Moored sediment trap measurements of carbon export in the Subantarctic and Polar Frontal Zones of the Southern Ocean, south of Australia. Journal of Geophysical Research-Oceans, 106(C12), 31489-31510, doi:10.1029/2000JC000308

Palavras-Chave #Al flux; Aluminium flux; Ann mass flux; Australian JGOFS Projects; Biogenic silica flux; bSiO2 flux; Calculated; Calculated, see reference(s); Carbon, inorganic, particulate flux; Carbon, inorganic, particulate flux per day; Carbon, organic, particulate flux; Date/Time; DATE/TIME; DEPTH, water; Depth water; Duration; Duration, number of days; Element analyser CHN; Litho flux; Lithogenic flux; Mass flux; Nitrogen, organic, particulate flux; Opal flux; OZGOFS; PIC flux; POC flux; PON flux; Total flux per year; Total mass flux per day
Tipo

Dataset