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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.
The Southern Ocean (SO) is one of the most productive oceanic regions in the world. Despite a high abundance of macronutrients such as nitrate and phosphorus, some areas have a surprisingly low amount of phytoplankton biomass. These...
Sinking particles transport organic carbon produced in the surface ocean to the ocean interior, leading to net storage of atmospheric CO2 in the deep ocean. The rapid growth of in situ imaging technology has the potential to...
Permafrost is an area of ground which continually maintains temperatures below 0˚C and is found across arctic and sub-arctic regions, with 50% of the global soil carbon contained within permafrost storage banks (Trubl et al., 2016). In...
The Arctic is warming at a rate twice that of other global ecosystems and changing climate conditions in the Arctic are mobilizing long frozen permafrost stores of organic carbon. In regions of extensive ground ice, thawing permafrost...
Climate change is radically altering the Arctic. These alterations are expected to have immense and cascading implications on the carbon cycling of the region. In particular, our interest lies in the Kolyma River (KR) as it is the...
The Deepwater Horizon (DWH) blowout of 2010 released an estimated 4.5-4.9 million barrels of oil and 500, 000t of methane into the Gulf of Mexico (GOM). Some of this oil rose to the surface, forming oil slicks, while an estimated 30% of...
Atmospheric Mercury Wet Deposition along the Northern Gulf of Mexico: Seasonal and Storm-Type Drivers of Deposition Patterns and Contributions from Local and Regional Emissions
Continuous event-based rainfall samples were collected at three sites throughout the Pensacola airshed from 2005 - 2011. Samples were analyzed for total mercury (Hg), a suite of trace metals (TMs), and major ions in order to understand...
The Biogeochemical Cycle of Mercury in the Northern Gulf of Mexico as Constrained by Carbon, Nitrogen, Sulfur, and Mercury Isotopic Ratios in Marine Fish
Mercury (Hg) in the environment has deleterious ecological and health affects for humans and wildlife and is primarily transferred to humans through the consumption of marine biota (USEPA, 2001). These ecological and health concerns are...
Inland waters receive significant inputs of organic and inorganic carbon (OC and IC) from terrestrial ecosystems. This water-borne carbon (C) is subsequently stored, processed, outgassed, or exported downstream depending a suite of...
Northern high-latitude regions are undergoing rapid changes as the Arctic warms at about twice the rate of mid-latitudes. Climate change is causing permafrost thaw, vegetation and hydrologic shifts, and the increased incidence of...
The aeolian transport of aerosols (mineral dust from desert areas, smoke and ash from biomass burning, and from anthropogenic emissions) is an important process for introducing bioactive trace elements to the surface ocean and can have a...
Inland aquatic systems such as lakes, rivers, and wetlands are pivotal in cycling carbon between the landscape and the atmosphere. However, as global air temperatures increase and precipitation patterns continue to change, their roles as...
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...
Climate change is dramatically altering the global carbon cycle. The warming caused by climate change is approximately twice the global average in Arctic and contiguous northern high-latitude regions, which are thus especially...
Dissolved organic phosphorus (DOP) in the surface ocean has a dual role as both the product of primary production and as a phosphorus substrate for phytoplankton when inorganic forms of phosphorus (P) are scarce. DOP has increasingly...
In the spring of 2010, the MC 252 Deepwater Horizon well blow out lead to nearly five million barrels of Gulf of Mexico light sweet crude to be released into the northern Gulf at a depth of 1500 meters. Dispersant injected into the plume...
Peatlands cover a small percentage of the earth surface, but the exact mechanisms of how a third of the Earths global soil carbon is sequestered is not yet resolved. Therefore, this thesis aims to explore the relationship between the...
After the Deepwater Horizon (DWH) blowout, MC252 crude oil was washed onto the shores of the northeastern Gulf of Mexico. Weathered oil was buried in sandy Florida beaches in the form of sands covered by oil films, small oil particles, ...
This study investigated the spatiotemporal changes in sediment organic carbon (OC) content in Apalachicola Bay, Florida, USA employing two complementary analytical approaches. The first approach compared region-wide surface sediment...
Investigating Biological Carbon Pump Variability and Functionality: The Application of Old and New Conceptual Frameworks across Spatial and Temporal Scales
The ocean is a central cog in the global carbon cycle, playing a major role in regulating the Earth's climate. A prominent mechanism driving uptake and sequestration of carbon is the "biological carbon pump" (BCP). Driven by newly...
The marine biological pump sequesters atmospheric carbon dioxide (CO2) in the ocean when phytoplankton convert CO2 to organic carbon in the surface ocean. Subsequent sinking of dead planktonic biomass to the deep ocean moves carbon from...
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.
