Reconstructing the sensitivity of past climate to forcings, and of ancient glaciers and ice sheets to this climate, can allow us to better understand the range of climate and cryosphere behavior we may see in the coming centuries. The Arctic is a region of particular importance due to its well-documented...
Early Holocene summer warmth drove dramatic Greenland ice sheet (GIS) retreat. Subsequent
insolation-driven cooling caused GIS margin readvance to late Holocene maxima, from which ice margins
are now retreating. We use ¹⁰Be surface exposure ages from four locations between 69.4°N and 61.2°N to
date when in the early Holocene south...
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. N.
LeGrande, F. S. Anslow, and G. Sinclair (2014), Earliest Holocene south
Greenland ice sheet
Early Holocene summer warmth drove dramatic Greenland ice sheet (GIS) retreat. Subsequent
insolation-driven cooling caused GIS margin readvance to late Holocene maxima, from which ice margins
are now retreating. We use ¹⁰Be surface exposure ages from four locations between 69.4°N and 61.2°N to
date when in the early Holocene south...
Early Holocene summer warmth drove dramatic Greenland ice sheet (GIS) retreat. Subsequent insolation-driven cooling caused GIS margin readvance to late Holocene maxima, from which ice margins are now retreating. We use ¹⁰Be surface exposure ages from four locations between 69.4°N and 61.2°N to date when in the early Holocene south...
The purpose of this thesis is to analyze an abrupt case of climate change in the past as a means to understand the mechanisms that force climate change. By looking to past analogs of climate change, we hopefully will gain an understanding of these events, which could be used to...
The goal of dissertation research was to use geochemical, statistical and geological methods to constrain and understand climate variability over several different time scales. Specifically, I have addressed three questions regarding past climate change: (1) how does the record of Irish cirque glaciers constrain the dimensions of the Irish Ice...
Stratigraphy and chronology are essential to sedimentological study of Earth system histories. And, stratigraphy and chronology are often challenging and interesting problems themselves. The Quaternary (2.588 Ma - present) experienced paleoenvironmental and paleo-geomagnetic variability well outside the range of the recent instrumental record, providing the opportunity to place recent observations...
The volcanic (~45-10 Ma) and plutonic rocks (~37-12 Ma) comprising the Western Cascades extend from northernmost California to southern British Columbia and are ancestral to modern arc magmatism. The ancestral arc hosts a series of small plutons that are locally associated with porphyry (Cu-Mo) and epithermal (Au) ore deposits. Three...
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