Document Detail

Changing climate and sea level alter Hg mobility at Lake Tulane, Florida USA.
MedLine Citation:
PMID:  23043314     Owner:  NLM     Status:  Publisher    
Between 45,000 cal y BP and the beginning of the Holocene, the accumulation rate for Hg in sediments of Lake Tulane, Florida USA ranged from ≈2 to 10 µg m-2 y-1, compared with 53 µg Hg m-2 y-1 in the 1985-1990 period of anthropogenic input. The locality experienced regional draw-down of the water table during the Wisconsinan glaciation, which lowered global sea level by nearly 130 m. Natural atmospheric deposition of Hg to the surrounding area resulted in long-term (ca. 100,000 years) sequestration of this atmospheric flux of Hg, primarily by adsorption in the oxic Al- and Fe-hydroxide-rich sandy subsoil. Global sea level rise during deglaciation led to a rising regional water table, flooding the oxidized soils surrounding Tulane. Iron and adsorbed Hg were mobilized by reductive dissolution and transported by groundwater flow to Lake Tulane and ultimately to the accumulating sediment. The accumulation rate of Hg (and Fe) increased rapidly about 16,000 cal y BP, peaked at nearly 60 µg Hg m-2 y-1 ca. 13,000-14,000 cal y BP, declined sharply during the Younger Dryas, and then increased sharply to a second 60 µg Hg m-2 y-1 peak about 5,000 cal y BP. Thereafter, it declined nearly to background by 900 cal y BP. In similar geologic situations, rapid modern sea level rise will initiate this process globally, and may mobilize large accumulations of Hg and lesser amounts of As, and other redox sensitive metals to groundwater and surface water.
George Lloyd Jacobson; Stephen A Norton; Eric C Grimm; Terry Edgar
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-9
Journal Detail:
Title:  Environmental science & technology     Volume:  -     ISSN:  1520-5851     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-9     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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