Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 167 for “"paleoclimate"”.
-
Investigating Mexican paleoclimate with precisely dated speleothems
Speleothems, or sedimentary rocks formed in caves, act as valuable archives of past climate change due to their suitability for U-series dating and high-resolution proxy analysis. These records can provide insights into water availability and controls on hydrology prior to the instrumental record. …
-
Investigating Mexican paleoclimate with precisely dated speleothems
Speleothems, or sedimentary rocks formed in caves, act as valuable archives of past climate change due to their suitability for U-series dating and high-resolution proxy analysis. These records can provide insights into water availability and controls on hydrology prior to the instrumental record. …
-
Paleoaltimetry incorporating atmospheric physics and botanical estimates of paleoclimate
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1996.
-
Questions and clarity: insights from applying computational methods to paleoclimate archives
It is a scientifically accepted fact that the Earth’s climate is presently undergoing significant changes with the potential for immense negative impacts on human society. As evidence of these impacts become clear and common, it becomes ever more important to constrain the nature, magnitude, and …
-
Late quaternary Alaskan paleoclimate : geoarchaeological insights into the Pleistocene-Holocene transition.
… and sedimentological analyses to reconstruct paleoclimate and the site formation history of three archaeological sites in Alaska: Dry Creek in the Nenana River Valley, Owl Ridge in the Teklanika River Valley, and Serpentine Hot Springs on the Seward Peninsula. This work reveals a progressive …
-
Interpretations of Paleoclimate and Speleogenesis from Speleothems in Donnehue's Cave, Indiana
… trends. Researchers studying past climate (paleoclimate) records from different parts of the world are beginning to piece together an increasingly detailed picture of past climatic patterns on a global scale. Some of the most reliable resources for investigating continental paleoclimatic …
-
Questions and Clarity: Insights from Applying Computational Methods to Paleoclimate Archives
It is a scientifically accepted fact that the Earth’s climate is presently undergoing significant changes with the potential for immense negative impacts on human society. As evidence of these impacts become clear and common, it becomes ever more important to constrain the nature, magnitude, and …
-
Paleoclimate and paleoecology of Miocene Eastern African primate habitats : a multiproxy approach.
… precipitation have become a widely used tool for paleoclimate and paleoecological inference. However, African floras remain underrepresented in global calibration datasets, limiting the accuracy of climate reconstructions. This dissertation addresses that gap by expanding the leaf physiognomic …
-
Constructing a High-Resolution Record of Silurian Paleoclimate Using Carbonate Oxygen Isotopes
The collection of δ¹⁸O data from carbonates provides insight into the temperature of Earth millions of years ago. Paleozoic δ¹⁸O records are currently compiled from brachiopod fossils because of their resistance to diagenetic alteration, but this data is relatively sparse and not well …
-
The Neoproterozoic São Francisco Basin, central Brazil: tectonic evolution, paleoclimate, and mineral systems
The São Francisco Basin (SFB; ca. 950-550 Ma), central Brazil, hosts sediments deposited during most of the Neoproterozoic Era and so is a critical repository of information concerning the evolution of the late pre-Cambrian world. Detailed study and revision of existing stratigraphy reveals that …
-
Towards a coupled δ18O sugar and δ2H n-alkane approach in paleoclimate research
… and intriguing potential for more quantitative paleoclimate research, both on terrestrial and lacustrine sedimentary archives.
-
The effects of paleoclimate on the distributions of some North West African Lizards.
As awareness grows regarding impacts of global climate change, so does concern over the effects these changes have on a species habitat and distribution. Climate change is thought to have a major effect on the distribution of species, with the potential to cause isolated/fragmented populations, …
-
PALEOCLIMATE DURING DEPOSITION OF THE GREATER TWILIGHT PARK CONGLOMERATE, UPPER DEVONIAN, SOUTHEAST NEW YORK
… of seasonality. Climofunctions and paleoclimate models on bulk geochemistry from B horizons most proximal to GTPC layers produce average mean annual precipitation (MAP) estimates of 873 ± 209 mm to 1147 ± 108 mm. Whereas the same proxies on Givetian-age paleosols yield estimates …
-
Paleoclimate and mammal paleocology during the paleocene of North America: insights from stable isotopes.
Paleocene climate and its relationship to mammal ecology and biogeography were examined at continental scale to test for long-term stasis of ecogeographical patterns among mammals and to better understand the effects of climate change on mammalian faunal dynamics. I also investigated local …
-
Paleoclimate reconstructions over the last century from a tropical speleothem on Niue Island, South Pacific
The study examines the question whether speleothems from Niue Island (19°00'S, 169°50'W), a large carbonate platform located at the edge of West Pacific Warm Pool, can serve as archives of hydroclimate controlled by El-Niño/Southern Oscillation (ENSO) and of catastrophic cyclones that frequent the …
-
Fluvial sequence stratigraphy and paleoclimate of the Upper Triassic (Norian-Rhaetian) Chinle Strata, northern New Mexico.
Two age-equivalent Upper Triassic (Norian and Rhaetian) fluvial successions in New Mexico were evaluated from a sequence-stratigraphic and paleopedologic perspective. Meter-scale fining-upward fluvial aggradation cycles (FACs) comprise fluvial aggradational cycle sets (FACSETs) 4-15 m thick. …
-
Geochemical tools and paleoclimate clues : multi-molecular and isotopic investigations of tropical marine sediments and alpine ice
… a wealth of compounds that can be exploited as paleoclimate indicators. TOF-MS and fast GC techniques allowed me to generate this record in a short amount of time and without employing the traditional suite of purification techniques. Before about 9 ka, organic carbon and biomarker concentration …
-
Geochemical tools and paleoclimate clues : multi-molecular and isotropic investigations of tropical marine sediments and alpine ice
South American climate has undergone dramatic changes since the last glacial period, as evidenced from Cariaco Basin (Venezuelan coast) and Peru Margin marine sediment biomarker records. Compounds derived from vascular plant leaf waxes and delivered to the marine sedimentary environment, including …
-
Travertine from Egypt's Western Desert: a terrestrial record of North African paleohydrology and paleoclimate during the late Pleistocene
The "Green Sahara" pluvial phases that alternated with North African hyper-aridity during the Pleistocene are well recognized in tropical and Mediterranean marine records. However, comparatively few studies have investigated the terrestrial expression of these pluvials, in part because of the …
Page 1 of 9