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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.
Peatlands contain a significant amount of the global soil carbon, but the climate feedback affecting carbon stability within these peatland systems is still relatively unknown. Organic matter composition of peatlands plays a major role...
The authors investigated built environment (BE) factors in urban neighborhoods in DeKalb County, Georgia. Each volunteering, consenting senior was placed into one of two groups: walking tours outside, then discussions (n=37); and focus...
Northern high-latitude freshwater systems are an essential link between terrestrial and marine carbon cycles, transporting organic matter from ecosystems on land to the Arctic Ocean. However, polar regions are warming faster than the...
Globally, karst ecosystems are experiencing anthropogenic impacts due to their high hydrologic connectivity, leading to issues including increasing color (browning) as noted in recent decades at the largest freshwater spring on Earth ...
The United States Forest Service (USFS) bases their wildfire predictions on cloud-to-ground lightning flash density thresholds greater than 5 fl km-2. High flash densities and low precipitation are often emphasized with storms since they...
One of the major themes of geography is human and environment interaction. Human activities shape and influence the natural environment in numerous ways, and the effects of these activities vary across space and time. Conservation...
Quantifying the Effects of Increased Storminess and Sea-Level Change on the Morphology of Sandy Barrier Islands along the Northwestern and Atlantic Coasts of Florida
The ability to accurately quantify shoreline variability along sandy beaches is essential in order to establish aggressive mitigation strategies, based on recent global climate change projections. This investigation employed a suite of...
Analysis of Microbial Abundance, Metabolic Potential, and Transcriptional Activity in the Gulf of Mexico "Deadzone" Reveals an Ammonia-Oxidizing Archaeal Hotspot
The northern Gulf of Mexico (nGOM) is home to one of the largest eutrophication-driven seasonal hypoxic zones in the world. These hypoxic zones are also known as “dead zones” because dissolved oxygen (DO) concentrations of ≤ 2 mg L-1 are...
Excessive nitrogen loading to surface water bodies has resulted in serious environmental, economical, ecological, and human health problems, such as groundwater contamination and eutrophication in surface water. One important source of...
Karst aquifers are vulnerable to contamination, as conduits and fractures in the aquifers are preferential flow paths where contaminants move fast. On the other hand, the presence of conduits and fractures make groundwater modeling for...
The Gulf of Mexico is a hydrocarbon-rich region characterized by the presence of floating oil slicks from persistent natural hydrocarbon seeps, which are reliably captured by synthetic aperture radar (SAR) satellite imaging. Improving...
The Deepwater Horizon (DwH) blowout released 5.0x1011g C from gaseous hydrocarbon into the water column and up to 6.0x1011g C from oil (Joye et al., 2011). Oil was visible on the surface, but <0.01% of the gaseous hydrocarbon escaped the...
In this research I explored the use of the statistical characteristics of the distribution of elevation points within a basin for predicting the rate at which at peak in rainfall at some point within the basin becomes at peak in runoff...
The annual cycle is a large scale climate process which influences smaller scale climate and meteorological processes. In this research, the annual cycle is defined by the climates response to Earth's orbit about the sun. In this...
The marine biological carbon pump is a primary control on atmospheric carbon dioxide concentrations by transporting fixed organic carbon into the ocean’s interior thereby isolating it from the atmosphere, often for years to centuries....
In the uppermost millimeters of shallow submerged coastal sediments, photosynthesis by microalgae and cyanobacteria during daylight hours can cause oxygen supersaturation of sediment porewater, leading to bubble formation. In shallow...
Hardbottom habitats in the Big Bend Region of the Gulf of Mexico are the foundation for structure-forming species, such as corals and sponges. These structure forming communities (SFC) provide important ecological services; they serve as...
Fate of the Mesophotic Coral Ecosystem (MCE) in the Northeastern Gulf of Mexico after the Deepwater Horizon Incident: Impacts, Restoration, Conservation, and Hazards
The Gulf of Mexico, one of the most geomorphologically complex oceanic basin, is also one of the most prolific hydrocarbon reserves in the world. It hosts a varied range of marine communities from shallow reefs and estuarine communities...
Between Proxy and Instrument: Reconstructing Past Weather Using Qualitative Human Observations in the Absence of Instrumental and Proxy Records: A Case Study from Shirley Plantation, Virginia USA
In this dissertation, I produce novel scientific knowledge about the weather of the past using subjective human observations in the absence of instrumental records in the United States. Using a handwritten plantation journal from Shirley...
Different sources of uncertainties have been inevitably induced into the environmental modeling due to different reasons such as the variability in the future climate state, incomplete knowledge and complexity of the nature system, and...
Invasive exotic plants have wide ranging impacts. They contribute to the decline of native plant species (Mack et al. 2000; Hulme 2003; Collingham et al. 2000), negatively impact hydrology of certain habitats (Parker et al. 1999; Graf...
Tornadoes are one of the most dangerous natural hazards on Earth that often occur in clusters commonly known as an outbreak. On average, tornado outbreaks are getting larger and more productive with more tornadoes occurring per cluster....
Coral reefs have been increasingly reported as ecosystems in severe "crisis" and decline, with estimates of irreparably damaged reefs to be around 54%, and possible losses of 15-20% more over the next half-century. The urgency to...
Since the discovery of the Gulf of Mexico, it has become an area of extensive exploration. The Gulf of Mexico harbors specific commodities that are essential in our modern economy. Oil companies provided money and technology to find and...
Coral reef ecosystems provide essential goods and services to civilizations around theworld but are threatened by local and global anthropogenic disturbances. As we enter the United Nation’s Decade of Ocean Science for Sustainable...
Mountain glaciers export ancient, energy-rich, and highly bioavailable dissolved organic matter (DOM) to freshwater and marine ecosystems, influencing downstream carbon cycling and supporting food webs. Despite its importance and the...
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.
