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Some of the material in is restricted to members of the community. By logging in, you may be able to gain additional access to certain collections or items. If you have questions about access or logging in, please use the form on the Contact Page.
This study is focused on the application of 222Rn (radon, t1/2=3.8 d) as a geochemical tracer for evaluation groundwater fluxes in different aquatic systems including submarine springs and lakes. For this purpose improvements of some...
Mercury Isotopic Composition of Fish, Including Gag Grouper (Mycteroperca microlepis) and Red Snapper (Lutjanus campechanus) as Constraints of Mercury Cycling in the Northern Gulf of Mexico
Mercury is a naturally occurring, pervasive element in the environment, with many chemical forms. Toxicology, environmental cycling and retention, and production of mercury by industrial processes and natural and manufactured emissions...
Hagfishes (Myxinidae) are common in deep waters of the Gulf of Mexico (GOM). Two of the species found in the GOM are endemic to the area and potentially provide key ecosystem services (e.g. generate substrate turnover and recycling of...
In the shallow, bar-built estuary Apalachicola Bay, the discharge of the Apalachicola River, the largest river in Florida by discharge volume, produces short residence times of water in the Bay and pronounced gradients in salinity and...
This study focused on the combined use of radon and radium isotopes as tracers of near-shore geophysical processes including submarine groundwater discharge (SGD), water exchange rates, and atmospheric evasion. Methods were developed for...
As the Arctic warms, the ~277 Pg of carbon stored in permafrost peatlands faces an uncertain fate. Arctic and Subarctic peatlands are likely to release more methane (CH4) as permafrost thaw releases formerly-frozen carbon, thaw-induced...
Fundamental to an understanding of El Niño/Southern Oscillation climate fluctuations is an understanding of the interannual equatorial Pacific surface flows, which advect the surface waters and change the sea surface temperature. While...
Deep-sea meiofauna along the continental rise off the west coast of North America are nearly unstudied. To begin to remedy this situation, I sampled each of four regions (off Oregon and off northern, central, and southern California) for...
To determine if the distinct deuterium (D) and oxygen-18 (18O) signature of precipitation from a tropical storm or hurricane could be used as a natural tracer in a springshed, isotope analyses of water samples from Wakulla Spring in...
On a global scale, peatlands contain 530 ± 160 Pg carbon, which is equivalent to >50% of the atmospheric pool. The fate of this enormous C reservoir could significantly impact the climate trajectory. Yet, two puzzling phenomena persist...
A method for estimating deep, depth independent current variability is described. The procedure uses XBT derived dynamic heights to remove the near surface signal from altimetric sea surface height (SSH). The difference between SSH and...
The wind-driven oceanic circulation in the presence of bottom topography that isopycnals intersect is examined in an idealized setting. A modified quasi-geostrophic (QG) model has been designed and implemented. The model allows staircase...
Many productive coastal areas, such as estuaries, are important fisheries. However, increased respiration associated with the high productivity often occurring in coastal zones may result in low dissolved oxygen conditions (dysoxia). The...
Submarine groundwater discharge (SGD) assessments conducted both in the laboratory and at a field site in the northeastern Gulf of Mexico, using a continuous-heat type automated seepage meter (seepmeter) have shown that the device has...
Stalagmites, or speleothems, are secondary cave deposits that record the isotope and trace element composition of the parent dripwaters within their crystal matrix. Changes in dripwater oxygen and carbon isotopes (δ18O and δ13C) and...
The chemical compositions of basaltic melts from diverse tectonic settings on Earth are interpreted in terms of mantle sources that are either a single lithology (peridotite) or composed of two mixed lithologies (peridotite + pyroxenite)...
Northern peatlands are complex wetland ecosystems that are characterized as bogs, fens, or tundra. Since these systems are flooded for much of the growing season, organic matter often decomposes anaerobically. Methanogenesis is the...
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