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Articles 1 - 7 of 7
Full-Text Articles in Physical Sciences and Mathematics
Putting The West Antarctic Ice Sheet Into Context, George H. Denton, Brenda L. Hall
Putting The West Antarctic Ice Sheet Into Context, George H. Denton, Brenda L. Hall
University of Maine Office of Research Administration: Grant Reports
This award supports a project to develop new insights into the cause and pattern of events during the last glacial termination in South America and Antarctica. One emerging view is that a warming Southern Ocean (SO), driven by a chain of events initiated in the Northern Hemisphere (NH) and tied to the interhemispheric climate seesaw of the last termination, was the underlying mechanism that drove the West Antarctic ice sheet (WAIS) from its Late Glacial Maximum (LGM) position back to present-day grounding lines. This ocean thermal forcing would have impacted WAIS by accelerating basal melt rates on fringing floating ice …
Collaborative Research: Exploring A 2 Million + Year Ice Climate Archive-Allan Hills Blue Ice Area (2mbia), Andrei V. Kurbatov, Paul Andrew Mayewski
Collaborative Research: Exploring A 2 Million + Year Ice Climate Archive-Allan Hills Blue Ice Area (2mbia), Andrei V. Kurbatov, Paul Andrew Mayewski
University of Maine Office of Research Administration: Grant Reports
This award supports a project to generate an absolute timescale for the Allan Hills Blue Ice Area (BIA), and then to reconstruct details of past climate changes and greenhouse gas concentrations for certain time periods back to 2.5 Ma. Ice ages will be determined by applying emerging methods for absolute and relative dating of trapped air bubbles (based on Argon-40/Argon-38, delta-18O of O2, and the O2/N2 ratio). To demonstrate the potential of the Allan Hills BIAs as a paleoclimate archive trenches and ice cores will be collected for age intervals corresponding to 110-140 ka, 1 Ma, and 2.5 Ma. During …
Collaborative Research: Globec Pan-Regional Synthesis: End-To-End Energy Budgets In Us-Globec Regions, Andrew C. Thomas
Collaborative Research: Globec Pan-Regional Synthesis: End-To-End Energy Budgets In Us-Globec Regions, Andrew C. Thomas
University of Maine Office of Research Administration: Grant Reports
The research addresses the overarching question: are marine food webs leading to fisheries controlled from the top-down, the bottom up, or a combination of the two? To address this question we will (1) compare end-to-end energy budgets of the 4 US-GLOBEC study regions in the context of top-down v. bottom-up forcing, (2) assess the skills of the regional models in capturing basic material fluxes, (3) extract diagnostics from the regional models that will be used to evaluate the effects of climate change and fishing pressure across GLOBEC regions and (4) develop quantitative methods to compare the diagnostics. The major successes …
The Anatomy Of Last Glacial Maximum (Lgm) Climate Change In The Southern Hemisphere Mid-Latitudes: Paleoecological Temperature Reconstructions From Terrestrial Archives, Marcus J. Vandergoes, Ann Dieffenbacher-Krall
The Anatomy Of Last Glacial Maximum (Lgm) Climate Change In The Southern Hemisphere Mid-Latitudes: Paleoecological Temperature Reconstructions From Terrestrial Archives, Marcus J. Vandergoes, Ann Dieffenbacher-Krall
University of Maine Office of Research Administration: Grant Reports
The objective of this research is to test if leading hypotheses about drivers of global ice ages explain climate change in the Southern Hemisphere mid-latitudes. The research establishes the timing, magnitude, and structure of southern mid-latitude Last Glacial Maximum climate from two sites bordering the Southern Alps, New Zealand, by reconstructing temperature changes from continuous, isotopically dated, paleo-chironomid and pollen re-cords.
Hypotheses about what drives ice age climate change remain clouded with ambiguities because the timing and magnitude of maximum ice age cooling (Last Glacial Maximum, LGM) does not appear to match between the Northern and Southern Hemispheres. Northern solar …
Collaborative Research: Norwegian-United States Ipy Scientific Traverse: Climate Variability And Glaciology In East Antarctica, Gordon S. Hamilton
Collaborative Research: Norwegian-United States Ipy Scientific Traverse: Climate Variability And Glaciology In East Antarctica, Gordon S. Hamilton
University of Maine Office of Research Administration: Grant Reports
This award supports a project of scientific investigations along two overland traverses in East Antarctica: one going from the Norwegian Troll Station (72deg. S, 2deg. E) to the United States South Pole Station (90deg. S, 0deg. E) in 2007-2008; and a return traverse starting at South Pole Station and ending at Troll Station by a different route in 2008-2009. The project will investigate climate change in East Antarctica, with the goals of understanding climate variability in Dronning Maud Land of East Antarctica on time scales of years to centuries and determining the surface and net mass balance of the ice …
Collaborative Research: Asian Ice Core Array (Aica)--Reconstruction Of Past Physical And Chemical Climate Over Asia, Paul Mayewski, Karl J. Kreutz, Andrei V. Kurbatov
Collaborative Research: Asian Ice Core Array (Aica)--Reconstruction Of Past Physical And Chemical Climate Over Asia, Paul Mayewski, Karl J. Kreutz, Andrei V. Kurbatov
University of Maine Office of Research Administration: Grant Reports
Funding is provided to help the researchers build on success using ice cores for understanding past physical and chemical climate change from Antarctica, Arctic, North Pacific and Asia by analyzing and interpreting a new array of Asian ice cores. The researchers plan to use five existing ice cores and collect one new ice core to enhance the reconstruction of environmental conditions over Asia.
The primary research questions for the Asian Ice Core Array (AICA) research include:
(1) Asian climate variability - How do major Asian circulation features (i.e., Asian monsoon, Westerlies, polar air masses, Siberian and Tibetan Highs) vary on …
Physical Properties Of The Us Itase Firn And Ice Cores From South Pole To Taylor Dome, Debra A. Meese, Ian Baker
Physical Properties Of The Us Itase Firn And Ice Cores From South Pole To Taylor Dome, Debra A. Meese, Ian Baker
University of Maine Office of Research Administration: Grant Reports
This award supports a project for physical properties research on snow pits and firn/ice cores with specific objectives that include stratigraphic analysis including determination of accumulation rates, annual layers, depth hoar, ice and wind crusts and rates of grain growth with depth. Studies of firn densification rates and how these parameters relate to the meteorology and climatology over the last 200 years of snow accumulation in Antarctica will also be investigated. The project will also determine the seasonality of accumulation by co-registration of stratigraphy and chemistry and determination of chemical species at the grain boundaries, how these may change with …