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Titolo:
Short-term variability in the flux of rapidly sinking particles in the Antarctic marginal ice zone
Autore:
Suzuki, H; Sasaki, H; Fukuchi, M;
Indirizzi:
Ishinomaki Senshu Univ, Fac Sci & Technol, Ishinomaki, Miyagi 9868580, Japan Ishinomaki Senshu Univ Ishinomaki Miyagi Japan 9868580 agi 9868580, Japan Natl Inst Polar Res, Itabashi Ku, Tokyo 1738185, Japan Natl Inst Polar Res Tokyo Japan 1738185 tabashi Ku, Tokyo 1738185, Japan
Titolo Testata:
POLAR BIOLOGY
fascicolo: 9, volume: 24, anno: 2001,
pagine: 697 - 705
SICI:
0722-4060(200109)24:9<697:SVITFO>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
PARTICULATE ORGANIC-CARBON; WEDDELL SEA; PHYTOPLANKTON BLOOM; SOUTHERN-OCEAN; PRIMARY PRODUCTIVITY; PLANKTON BIOMASS; ROSS SEA; EDGE; WATERS; KRILL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
50
Recensione:
Indirizzi per estratti:
Indirizzo: Suzuki, H Ishinomaki Senshu Univ, Fac Sci & Technol, Ishinomaki, Miyagi 9868580, Japan Ishinomaki Senshu Univ Ishinomaki Miyagi Japan 9868580 0, Japan
Citazione:
H. Suzuki et al., "Short-term variability in the flux of rapidly sinking particles in the Antarctic marginal ice zone", POLAR BIOL, 24(9), 2001, pp. 697-705

Abstract

A sediment trap deployment was made at a station (64 degrees 42 'S, 139 degrees 59 'E) at five depths (537, 796, 1,259, 1,722, 2,727 m) in the marginal ice zone (MIZ) of the Antarctic Ocean during a summer productive period from 26 December 1994 to 20 January 1995. This aim of the study was to reveal a possible occurrence of a sporadic bloom in surface layers and to evaluate the role of fast-sinking particles in transportation processes of bloom-derived material down to mesopelagic and bathypelagic layers. During the observation, a marked flux increase (70.5 mg C m(-2) day(-1), 7.7 mg N m(-2)day(-1)) was observed at the depth of 537 rn on 7-9 January. The increasedflux at 537 m decreased with depth and time. The same mass of sinking particles forming the flux maximum at each depth sank down from the shallowest trap (537 m) to the deepest trap (2,727 m) within 4-11 days, indicating that these particles were transported downward to the bottom with the sinking rate of > 200 m day(-1). Collected particles were composed of two major particle fractions; one was dominated by fecal pellets of macrozooplankton (mainly Euphausia super a) with relatively fast sinking rates (FSP; fast-sinking particles) and the other by minute diatoms of Fragilariopsis curta with slow sinking rates (SSP; slowly sinking particles). According to the comparison of time depth changes of these two fractions, the SSP had unexpectedlyfaster sinking rates comparable with the FSP during the periods of maximumfluxes. probably indicating the SSP were transformed from the FSP during sinking. The present result strongly suggests that a local bloom of F. curtaand intensified zooplankton grazing activities occurred in surface layers in a few days in the MIZ, and then the egested fecal pellets were rapidly transported downward with fragmentation processes into small-sized minute particles in mesopelagic and bathypelagic layers.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 11/07/20 alle ore 16:38:40