Vertical transport of sediment-associated metals and cyanobacteria by ebullition in a stratified lake
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Published:2020-06-19
Issue:12
Volume:17
Page:3135-3147
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ISSN:1726-4189
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Container-title:Biogeosciences
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language:en
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Short-container-title:Biogeosciences
Author:
Delwiche Kyle,Gu Junyao,Hemond Harold,Preheim Sarah P.
Abstract
Abstract. Bubbles adsorb and transport particulate matter in a variety of
natural and engineered settings, including industrial, freshwater, and
marine systems. While methane-containing bubbles emitted from anoxic
sediments are found widely in freshwater ecosystems, relatively little
attention has been paid to the possibility that these bubbles transport
particle-associated chemical or biological material from sediments to
surface waters of freshwater lakes. We triggered ebullition and quantified
transport of particulate material from sediments to the surface by bubbles
in Upper Mystic Lake, MA, and in a 15 m tall experimental column. Particle
transport was positively correlated with the volume of gas bubbles released
from the sediment, and particles transported by bubbles appear to originate
almost entirely in the sediment, rather than being scavenged from the water
column. Concentrations of arsenic, chromium, lead, and cyanobacterial cells
in bubble-transported particulate material were similar to those of bulk
sediment, and particles were transported from depths exceeding 15 m,
implying the potential for daily average fluxes as large as 0.18 µg arsenic m−2 and 2×104 cyanobacteria cells m−2 in the
strongly stratified Upper Mystic Lake. Bubble-facilitated arsenic transport
currently appears to be a modest component of total arsenic cycling in this
lake. Although more work is needed to reduce uncertainty in budget
estimates, bubble-facilitated cyanobacterial transport has the potential to
contribute substantially to the cyanobacteria cell recruitment to the
surface of this lake and may thus be of particular importance in large,
deep, stratified lakes.
Funder
National Institute of Environmental Health Sciences Division of Earth Sciences
Publisher
Copernicus GmbH
Subject
Earth-Surface Processes,Ecology, Evolution, Behavior and Systematics
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