NDLI: Vertical accretion rates and heavy metal chronologies in wetland sediments of the Tijuana Estuary

Content Provider	Springer Nature Link
Author	Weis, Daniel A. Callaway, John C. Gersberg, Richard M.
Copyright Year	2001
Abstract	This study represents the first report on sediment accretion rates using$^{137}$Cs dating for a southern California salt marsh. Vertical accretion rates ranged from 0.7 to 1.2 cm yr$^{−1}$, which is at the high end of sediment accretion values for coastal wetlands. This has lead to increases in elevation within the estuary from 18 to 35 cm over the last 35 years. Depth profiles of metal concentrations were converted to time-based profiles using vertical accretion rates. Chronologies for most cores indicate a consistent peak in sediment lead (Pb) concentrations in the early to mid 1980s, corresponding to the historic decline in Pb use, which was completed in the U.S. by the early 1980s, but not begun in Mexico until 1991. Sediment Pb levels ranged from about 6–56 μg g$^{−1}$. Other metals did not show any consistent trends in sediment chronology, except for a single core from a mid-marsh site (east-mid 2), which showed a 2–3-fold increase in levels of Cu, Ni, and Zn during the past two decades. Sediment levels of copper (Cu), nickel (Ni), and zinc (Zn) ranged from 6–34 μg g$^{−1}$, 11–27 μg g$^{−1}$, and 42–122 μg g$^{−1}$, respectively. Despite rapid industrial development of the watershed, a comparison of the sediment metal concentrations in the Tijuana Estuary to other anthropogenically-impacted estuaries in the United States and Europe, shows that metal levels in sediments of the north arm of the estuary are relatively low.
Starting Page	840
Ending Page	850
Page Count	11
File Format	PDF
ISSN	01608347
Journal	Estuaries
Volume Number	24
Issue Number	6
Language	English
Publisher	Springer-Verlag
Publisher Date	2001-01-01
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Environment Ecology Geosciences Freshwater & Marine Ecology Environmental Management Nature Conservation
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Aquatic Science Environmental Science

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