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Titolo:
TRACE-METAL CONCENTRATIONS IN THE SURF ZONE AND IN COASTAL WATERS OFFBAJA-CALIFORNIA, MEXICO
Autore:
SANUDOWILHELMY SA; FLEGAL AR;
Indirizzi:
SUNY STONY BROOK,MARINE SCI RES CTR STONY BROOK NY 11794 UNIV CALIF SANTA CRUZ,WIGS,EARTH SCI BOARD SANTA CRUZ CA 95064
Titolo Testata:
Environmental science & technology
fascicolo: 5, volume: 30, anno: 1996,
pagine: 1575 - 1580
SICI:
0013-936X(1996)30:5<1575:TCITSZ>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
NORTHEAST PACIFIC WATERS; CADMIUM; COPPER; DISTRIBUTIONS; NICKEL; MANGANESE; ATLANTIC; SILVER;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
24
Recensione:
Indirizzi per estratti:
Citazione:
S.A. Sanudowilhelmy e A.R. Flegal, "TRACE-METAL CONCENTRATIONS IN THE SURF ZONE AND IN COASTAL WATERS OFFBAJA-CALIFORNIA, MEXICO", Environmental science & technology, 30(5), 1996, pp. 1575-1580

Abstract

Pronounced spatial gradients were observed in trace element concentrations (Cd, Co, Cu, and Ni) in nearshore surf zone (<100 m offshore) and coastal (5-45 km offshore) waters off Baja California, Mexico. The ranges of metal concentrations in those waters were 0.034-0.26 nM for Cd, 0.022-0.59 nM for Co, 0.93-3.6 nM for Cu, and 3.6-6.4 nM for Ni. Metal concentrations exhibited offshore gradients, with the highest levels nearshore. Metal:salinity, metal:nutrient, and metal:metal relationships indicated that the relatively high nearshore concentrations werecaused by upwelling (Cd and Ni) and by benthic particle resuspension and diagenetic remobilization (Co and Cu). The relatively low offshoreconcentration levels appeared to be caused, in part, by the intrusionof oceanic waters from the North Pacific Central Gyre, as evidenced by similarities in the molar ratios of Ag:Cu in coastal waters off BajaCalifornia (9.0 x 10(-3)) and in subtropical oceanic waters off central Mexico (9.6 x 10(-3)). This was also consistent with physical oceanographic measurements, which have traced the surfacing of the northward-flowing California Undercurrent off Baja California. The similarities between metal:nutrient and metal:metal ratios for surface waters offBaja California with those reported for the north Pacific suggested that distributions of Cd, Co, Cu, and Ni in the area of study appear tobe dominated by natural physical and biogeochemical processes characteristic of open ocean waters.

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Documento generato il 18/09/20 alle ore 20:10:19