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In situ radon-222 flux experiments conducted in benthic chambers in Cape Lookout Bight, a small marine basin on the North Carolina coast, reveal that enhanced chemical transport across the sediment-water interface during summer months is caused by abiogenic bubble tube structures. Transport rates for dissolved radon, methane, and ammonium more than three(More)
7. As and W as a function of dissolved Cl concentrations in inflow and lake water, in hydrothermal vent fluids, and in the mixing experiments between Yellowstone River water and subaerial geyser fluids .. 4. Comparisons of predicted chemical compositions of boiled geothermal source fluid to Yellowstone Lake water and deep thermal reservoir fluid with(More)
Increased sea level is the climate change effect expected to have the greatest impact on mangrove forest survival. Mangroves have survived extreme fluctuations in sea level in the past through sedimentation and belowground carbon (C) accumulation, yet it is unclear what factors may influence these two parameters. We measured sedimentation, vertical(More)
Digital particle image velocimetry (DPIV) has become a popular measurement technology for fluid flows since it was introduced in the early 1990s (Adrian 1991; Willert and Gharib 1991). Since PIV can resolve the two dimensional (2D) distribution of two (or three) components of velocity instantaneously , it is ideal for characterizing spatial structures of(More)
Remotely operated vehicle dives on a site of unusual depth-sounder features unveiled a field of stalagmite-like spires of possible hydrothermal origin near the Bridge Bay marina. Fragments collected from the base of several spires were composed of very low-density, porous material resembling siliceous sinter. A National Park Service dive team retrieved a(More)
Geochemical inputs to Yellowstone Lake, Wyoming, come from a variety of sources, including hydrothermal vents, groundwater, rainwater, flux from sediments , and direct runoff. One-third of Yellowstone Lake is directly influenced by hydrothermal activity (hot-water vents and fumaroles). Geothermally heated water percolating through the chamber is highly(More)
The discovery and description of hydrothermal features such as geothermal vents, gas fumaroles, and even geysers within Yellowstone Lake is presented. Research was carried out over a period of 17 years beginning in 1984 and employed SCUBA to observe the sublacustrine hot springs and microbial mats in Sedge Bay, Yellowstone Lake. These initial observations(More)
Reduced inorganic compounds of geothermal-origin hydrogen sulfide (H 2 S), iron (Fe[II]), and methane (CH 4) were common but not ubiquitous components of hydrothermal vent fluids of Yellowstone Lake at concentrations capable of supporting chemolithoautotrophic (geochemical-oxidizing, carbon dioxide (CO 2)-fixing) bacterial growth. Closely linked to the(More)
The sediments of Yellowstone Lake may reveal the paleoecological history of this lake over the last few centuries. These sediments contain up to 60% biogenic silica derived from diatom frustules settling out from the overlying water. The sediment record reveals large variations in the diatom deposition over the last ~350 years. Some of these variations(More)
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