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Articles 751 - 780 of 59552
Full-Text Articles in Entire DC Network
How Quickly Do Eastern Floodplains Store Carbon? Quantifying Reference Carbon Flux On The Dead Diamond River, Jacob Schnell
How Quickly Do Eastern Floodplains Store Carbon? Quantifying Reference Carbon Flux On The Dead Diamond River, Jacob Schnell
Earth Sciences Undergraduate Senior Theses
Terrestrial Earth systems sequester an estimated 30% of annual anthropogenic CO2 emissions. The largest share is stored in global soils which collectively store more than 3 times the amount of carbon as the atmosphere. Floodplains and river systems, while covering only 5–8% of land area, store 20–30% of the global soil organic carbon (SOC), yet, the rate at which floodplains sequester carbon remains highly uncertain. Here I constrain floodplain carbon sequestration rates for a model northeastern river that has not been impacted by development or significant human activity. I calculate carbon stock using total organic carbon and derive carbon flux …
Late Pleistocene-Holocene Environmental Change From May Pond Sediment Cores And Upland 10be Ages, Adrianna Drindak
Late Pleistocene-Holocene Environmental Change From May Pond Sediment Cores And Upland 10be Ages, Adrianna Drindak
Earth Sciences Undergraduate Senior Theses
The goal of this project is to reconstruct the deglaciation and post-glacial environmental conditions of northern Vermont that occurred during the transition from the Pleistocene to the Holocene, ~15,000 to 11,000 years ago. This transition marks a major climatic shift, from a glacial period to an interglacial period, and regionally involved the retreat of the Laurentide Ice Sheet (LIS). The retreat of the LIS influenced the surficial geology of North America, exposing the Earth’s surface, leaving glacial deposits, and carving out proglacial lakes. The timing of ice retreat in the region provides information about past climate conditions, which may inform …
Constraints On Crystallization Conditions From Pseudosection Thermobarometry Of The New World Mining District Porphyries Near Cooke City, Montana, Jacob Jared Gordon
Constraints On Crystallization Conditions From Pseudosection Thermobarometry Of The New World Mining District Porphyries Near Cooke City, Montana, Jacob Jared Gordon
Earth Sciences Undergraduate Senior Theses
The New World Mining District (NWMD), located two miles northeast of Cooke City, Montana, is host to a series of epithermal sills, dikes, and plutons, the intrusion of which is responsible for significant Au-Ag-Cu mineralization. These intrusive bodies were emplaced in the Eocene, potentially contemporaneously with the Heart Mountain Detachment - Earth’s largest subaerial landslide, and have been proposed as a potential trigger for the event. The pre-emplacement crys- tallization conditions for the porphyritic dikes in the region, however, remain unknown and have previously been limited to surface observations. Constraining the magmatic conditions of the in- trusives in the region …
Identifying Active Layer Dynamics Across Geomorphic Landforms In Longyeardalen, Central Svalbard, Madeline Kim Koelbel
Identifying Active Layer Dynamics Across Geomorphic Landforms In Longyeardalen, Central Svalbard, Madeline Kim Koelbel
Earth Sciences Undergraduate Senior Theses
The thermal state of the active layer and analysis of meteorological conditions provides a greater understanding of where active layer detachment slides can occur. This study provides an overview of the active layer ground thermal regime for 2024 and 2025 in Longyeardalen, Svalbard, where the largest settlement in Svalbard, Longyearbyen is located. Ground temperature data was extracted from 8 boreholes in Longyeardalen and meteorological data was extracted from one weather station in central Longyeardalen. Overall, the ALT thickness and the thawing period increased from 2024 to 2025 while the thaw rate remained the same or decreased. The zero-curtain effect was …
Comparison Of Fish Biomass And Fish Carbon Content Associated With Reef Sites At The Rio Grande Valley Artificial Reef In The Gulf Of Mexico, Allison K. White, Md Saydur Rahman, Richard J. Kline
Comparison Of Fish Biomass And Fish Carbon Content Associated With Reef Sites At The Rio Grande Valley Artificial Reef In The Gulf Of Mexico, Allison K. White, Md Saydur Rahman, Richard J. Kline
School of Earth, Environmental, & Marine Sciences Faculty Publications
As global fisheries stocks have decreased due to overfishing and climate change, artificial reefs have gained significant attention. In addition to providing or restoring habitat, artificial reefs may serve as carbon capture sinks and potential climate mitigation strategies. The Rio Grande Valley (RGV) Reef is an artificial reef located in the northwestern Gulf of Mexico off the coast of Texas. The RGV Reef area spans 1,650 acres and is comprised of hundreds of groupings of recycled and pre-formed materials ranging from low relief (1–2 ft) to high relief (8–30 ft) reef structures. This reef provides a variety of novel habitat …
Investigating The Distribution And Origin Of Pitted Mounds On Mars Using Machine Learning-Based Mapping And Integrated Geological Analysis: Application To Isidis Planitia, Precious Batubo
Doctoral Dissertations
Pitted mounds are widespread landforms across the northern plains of Mars, yet their origin remains uncertain. These features have been interpreted as possible expressions of subsurface fluid activity, including sedimentary volcanism, magmatic processes, or other fluid-assisted mechanisms. Determining their distribution, morphology, and geology is therefore important for understanding the evolution of subsurface hydrological processes and the planet’s potential for habitability. However, the large spatial extent of mound-bearing terrains makes comprehensive manual mapping impractical. This dissertation presents an automated approach to mound detection using Faster Region-Based Convolutional Neural Network (Faster R-CNN) from high-resolution Context Camera (CTX) images including morphometric and mineralogical …
Mgrre_Thinsections_Mgrre-147_7, Mgrre
Mgrre_Thinsections_Mgrre-147_2, Mgrre
Mgrre_Thinsections_Mgrre-147_8, Mgrre
Mgrre_Thinsections_Mgrre-147_3, Mgrre
Mgrre_Thinsections_Mgrre-147_1, Mgrre
Mgrre_Thinsections_Mgrre-147_9, Mgrre
Mgrre_Thinsections_Mgrre-147_10, Mgrre
Stratigraphic Distribution Of Pleistocene Aves At Fossil Lake In Lake County, Oregon, Cole Bradley Phillips
Stratigraphic Distribution Of Pleistocene Aves At Fossil Lake In Lake County, Oregon, Cole Bradley Phillips
Masters Theses
The Fossil Lake locality in south-central Oregon is rich in many species of fossil remains and is also home to packages of sandstone that grade upward into finer siltstone or claystone. These packages have been interpreted to represent rising and falling lake levels as a result of glacial transgressive and regressive sequences. The fossil vertebrates and invertebrates have also fluctuated because of the different climates at Fossil Lake. Although the stratigraphic distribution of most classes of animals have been determined, fossil birds have not. Here, the distribution of 329 avian fossils is presented in the stratigraphic framework. The species were …
Mgrre_Thinsections_Mgrre-147_24, Mgrre
Mgrre_Thinsections_Mgrre-147_23, Mgrre
Mgrre_Thinsections_Mgrre-147_25, Mgrre
Mgrre_Thinsections_Mgrre-101_6, Mgrre
Mgrre_Thinsections_Mgrre-101_20, Mgrre
Mgrre_Thinsections_Mgrre-101_22, Mgrre
Mgrre_Thinsections_Mgrre-101_24, Mgrre
Mgrre_Thinsections_Mgrre-101_20, Mgrre
Mgrre_Thinsections_Mgrre-102_1, Mgrre
Mgrre_Thinsections_Mgrre-101_3, Mgrre
Mgrre_Thinsections_Mgrre-101_4, Mgrre
Mgrre_Thinsections_Mgrre-101_5, Mgrre
Mgrre_Thinsections_Mgrre-101_7, Mgrre
Mgrre_Thinsections_Mgrre-101_9, Mgrre