A5026251160- Geology and Paleoclimatology Research
- Methane Hydrates and Related Phenomena
- Isotope Analysis in Ecology
- Marine Biology and Ecology Research
- Marine and environmental studies
- Geological Studies and Exploration
- Geological formations and processes
- Arctic and Antarctic ice dynamics
- Paleontology and Stratigraphy of Fossils
- Coastal wetland ecosystem dynamics
- Cryospheric studies and observations
- Climate change and permafrost
- Evolution and Paleontology Studies
- Cephalopods and Marine Biology
- Marine animal studies overview
- Archaeology and ancient environmental studies
- Winter Sports Injuries and Performance
- Marine and fisheries research
- Coastal and Marine Dynamics
- Coastal and Marine Management
- Subterranean biodiversity and taxonomy
- Pleistocene-Era Hominins and Archaeology
- Marine and coastal plant biology
- Neurobiology and Insect Physiology Research
- Maritime and Coastal Archaeology
United States Geological Survey
2015-2024
Florence Bascom Geoscience Center
2019-2024
Ackerman Institute for the Family
2022
University of Washington
2022
Government of the United States of America
2022
University of Maryland, Baltimore County
1987-2019
Case Western Reserve University
2012-2014
University of South Dakota
2013
University of California, Santa Barbara
2013
University of California, Berkeley
2013
Research Article| July 01, 1992 Closure of the Isthmus Panama: The near-shore marine record Costa Rica and western Panama ANTHONY G. COATES; COATES 1Department Geology, George Washington University, Washington, D.C. 20052 Search for other works by this author on: GSW Google Scholar JEREMY B. C. JACKSON; JACKSON 2Smithsonian Tropical Institute, Box 2072, Balboa, Republic LAUREL S. COLLINS; COLLINS 3Museum Paleontology, University Michigan, Ann Arbor, Michigan 48109-1079 THOMAS M. CRONIN;...
Abstract The processes controlling advance and retreat of outlet glaciers in fjords draining the Greenland Ice Sheet remain poorly known, undermining assessments their dynamics associated sea-level rise a warming climate. Mass loss has increased six-fold over last four decades, with discharge melt from comprising key components this loss. Here we acquired oceanographic data multibeam bathymetry previously uncharted Sherard Osborn Fjord northwest where Ryder Glacier drains into Arctic Ocean....
The hypothesis of a km-thick ice shelf covering the entire Arctic Ocean during peak glacial conditions was proposed nearly half century ago. Floating shelves preserve few direct traces after their disappearance, making reconstructions difficult. Seafloor imprints should, however, exist where grounded along flow paths. Here we present new evidence ice-shelf groundings on bathymetric highs in central Ocean, resurrecting concept an extending over at least one previous age. New and previously...
Research Article| May 01, 1990 High eustatic sea level during the middle Pliocene:Evidence from southeastern U.S. Atlantic Coastal Plain Harry J. Dowsett; Dowsett 1U.S. Geological Survey, 970 National Center, Reston, Virginia 22092 Search for other works by this author on: GSW Google Scholar Thomas M. Cronin Author and Article Information Publisher: Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print 0091-7613 Geology (1990) 18 (5): 435–438....
Variations in the ratio of magnesium to calcium (Mg/Ca) fossil ostracodes from Deep Sea Drilling Project Site 607 deep North Atlantic show that change bottom water temperature during late Pliocene 41,000-year obliquity cycles averaged 1.5°C between 3.2 and 2.8 million years ago (Ma) increased 2.3°C 2.3 Ma, coincidentally with intensification Northern Hemisphere glaciation. During last two 100,000-year glacial-to-interglacial climatic Quaternary, temperatures changed by 4.5°C. These results...
The Middle Pliocene ( approximately 3 million years ago) has been identified as the last time Earth was significantly warmer than it during Last Interglacial and Holocene. A quantitative micropaleontological paleotemperature transect from equator to high latitudes in North Atlantic indicates that warmth involved increased meridional oceanic heat transport.
Uranium-series dating of corals from marine deposits the U.S. Atlantic Coastal Plain coupled with paleoclimatic reconstructions based on ostracode (marine) and pollen (continent) data document at least five relatively warm intervals during last 500,000 years. On basis multiple paleoenvironmental criteria, we determined relative sea level positions intervals, to present mean level, were 7 +/- 5 meters 188,000 years ago, 7.5 1.5 120,000 6.5 3.5 94,000 3 72,000 ago. The composite chronology for...
Abstract. The Bering Strait connects the Arctic and Pacific oceans separates North American Asian landmasses. presently shallow ( ∼ 53 m) strait was exposed during sea level lowstand of last glacial period, which permitted human migration across a land bridge today referred to as Land Bridge. Proxy studies (stable isotope composition foraminifera, whale into Ocean, mollusc insect fossils paleobotanical data) have suggested range ages for reopening, mainly falling within Younger Dryas stadial...
Despite its importance in the global climate system, age‐calibrated marine geologic records reflecting evolution of glacial cycles through Pleistocene are largely absent from central Arctic Ocean. This is especially true for sediments older than 200 ka. Three sites cored during Integrated Ocean Drilling Program's Expedition 302, Coring (ACEX), provide a 27 m continuous sedimentary section Lomonosov Ridge Two key biostratigraphic datums and constraints magnetic inclination data used to anchor...
We investigated the deep-sea fossil record of benthic ostracodes during periods rapid climate and oceanographic change over past 20,000 years in a core from intermediate depth northwestern Atlantic. Results show that community "collapses" occur with faunal turnover up to 50% major climatically driven changes. Species diversity as measured by Shannon-Wiener index falls 3 low 1.6 these events. Major disruptions communities commenced Heinrich Event 1, Inter-Allerød Cold Period (IACP: 13.1 ka),...
List of Tables Preface Acknowledgments Abbreviations 1. Paleoclimatology and Modern Challenges 2. Methods in 3. Deep Time: Climate from 3.8 Billion to 65 Million Years Ago 4. Cenozoic 5. Orbital Change 6. Glacial Millennial 7. Events During Deglaciation 8. Holocene Variability 9. Abrupt 10. Internal Modes 11. The Anthropocene I: Global Hemispheric Temperature 12. II: Climatic Hydrological the Last 2000 Epilogue Appendix: Paleoclimate Proxies References Index
A benthic microfaunal record from the equatorial Atlantic Ocean over past four glacial-interglacial cycles was investigated to understand temporal dynamics of deep-sea latitudinal species diversity gradients (LSDGs). The results demonstrate unexpected instability and high amplitude fluctuations in tropical deep ocean that are correlated with orbital-scale oscillations global climate: Species is low during glacial interglacial periods. This implies climate severely influences diversity, even...