GLACIER natural accumulation of land ice showing movement at some time great ice sheets have waxed and waned over the surface of the Earth causes for.

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Presentation transcript:

GLACIER natural accumulation of land ice showing movement at some time great ice sheets have waxed and waned over the surface of the Earth causes for the increase and decrease in ice sheets are still uncertain, probably not one single thing

CAUSES OF GLACIATION CLIMATE CHANGE Earth has experienced many climate changes change in Earth temperature and air/water circulation decrease of 4 o to 5 o C (especially summer) large increase in the amount of snowfall in subarctic and arctic regions

SUGGESTED THEORIES FOR CLIMATE CHANGE reductions in solar radiation due to meteorite collisions with the Earth, increased volcanism shifting location of continents uplift of vast mountain regions Milankovitch Cycles

MILANKOVITCH CYCLES Milutin Milankovich – Serbian Astrophysicist thought to cause the necessary change to decrease global temperatures. Earth's orbit is elliptical, over periods of 100,000 years the shape varies changes in orbit have been matched with ocean sediments that record the history of glacial stages cycles of warming and cooling match with the estimated dates of glacial periods Earth "wobbles" on its axis which alters the amount of solar radiation reaching the Earth

Ice Sheet Structure zone of accumulation, the portion of the glacier over which accumulation exceeds ablation zone of ablation is the loss of ice (or snow) from the glacier equilibrium line is the boundary between these two zones If accumulation > ablation the glacier will grow If ablation > accumulation, the glacier will retreat

Ice Sheet Structure

Continental Form on continents, flat land Ellesmere Island, Canada Global distribution of continental glaciers

Alpine Form in mountains Jungfrau, Switzerland Nisqually, Mount Ranier

Piedmont Form by combining of alpine glaciers Malaspina Glacier, Alaska (landsat) Switzerland

Icebergs Pieces of glaciers that have broken off into water. Do you know what this process is called? Glacier Bay, Alaska

Ablation sublimation - solid to gas, ice (firn) to water vapor wind erosion – just like sand blowing away on a beach melting – ice changing from solid to liquid form evaporation - liquid to gas calving – process of glaciers breaking off into bodies of water, produces icebergs

Sublimation Ablation on Glacier de Tsanfleuron, Switzerland

Calving

What makes glaciers melt? List at least 3 things in your notes

REFERENCES