Ice ages and Global Warming. David Damm Greg McCormick. EAS 4610. Outline. Earth Temperature History Climate System Forcing and Response Ice sheet response Other feedbacks and responses Future climate. 3 Million yrs. Past 400k yrs. Past 10k yrs - Interglacial. Present Temperatures.By Audrey
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Abrupt Climate Change in the Glacial-Interglacial Record. AOS 528, 11/27/07. Definitions of Abrupt. Large changes within less than a 30 year period Abrupt on human time scales (climatology), but… A transition or response that is rapid compared to the forcing. Relevant for any time scale
Glacial Features. Your Name Your Homeroom. cirque. horn. fiord. arete. k ettle lake. k ettle lake. moraine. drumlin. glacial lake.
Glacial Deposits. The specification states that you should be able to: Describe the deposition in glacial environments of boulder clay (till), varves , fluvio-glacial sands and gravels and explain the processes that formed them
Glacial Processes. Glaciers are large masses of ice that move over time. On the basis of size and shape, glaciers can be divided into two types: Valley glaciers – Glaciers that flow down well defined stream valleys in mountainous regions.
Glacial Budgets. The glacial budget or net balance. The glacial system showing inputs, stores, transfers & outputs. Inputs. Humid & cold. Ablation The process of wastage of snow or ice by melting, sublimation and calving.
Glacial Environments. EG1103 March 2003 Dawn Nicholson. Introduction. c. 10% Earth’s surface covered by ice today – but declining due to global warming In the past, % ice cover has been much higher (eg 30% c. 20,000BP) c. 96% glacier ice in Antarctic and Greenland ice caps.
Glacial geomorphology. Glacier: “a natural accumulation of ice that is in motion due to its own weight and slope of its surface” Ice cores Paleoclimate archive: high-resolution records of climate change Compared to deep sea core. Ice Age. Ice Age. Ice Age. Ice Age. 22°. 12°. 17°.
Glacial Features. Continental and Alpine. Continental Features. Continental Features: New York. Credit: NASA, Visible Earth. Drumlin schematic. Source: www.geography-site.co.uk. Drumlin: Bunker Hill. Esker, Kettles: Manitoba. Credit: Geological Survey of Canada. Alpine Features. Arete.
Glacial Features. How Glaciers Re-Shape the Land. Weathering vs. Erosion What’s the difference?. Weathering = Breakdown of rock Erosion = Transport of sediments. …the rock surface below it gets scraped and weathered. As a glacier moves …. Rock.
Glacial Material. small Till. Glacial Till. - Glacial Rocks - All different sizes and shapes – unsorted. LARGE Till. Features of Glacial Rocks Glacial Polish – smooth surface Striations - scratches. Moraines Hills of till at the side, middle, and end of glacier.