Waves_5 - 1 EOSC 114 / Guillaume Carazzo Earthquakes...

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Unformatted text preview: 1 EOSC 114 / Guillaume Carazzo Earthquakes Volcanoes Landslides Storms Waves Impacts Recap Last session we examined:- Tsumamis- Storm surges 2 Waves Lecture 1- How do waves work ? Lecture 2- Waves on shorelines Lecture 3- Resonance & Interference Lecture 4- Monster waves Lecture 5- The future Outline 1/ Sea level changes 2/ Two case studies 3 Learning Goals By the end of this class you should be able to: 1. List 2 causes of eustatic changes in sea level 2. List 2 causes of regional changes in sea level 3. Relate these changes to risks for coastal communities 4. Describe the impact of sea ice and permafrost melt on erosion in the Arctic 5. Describe the impact of Mississippi erosion mitigation efforts on New Orleans Recent global temperature changes In the 20 th century, average global SURFACE TEMPERATURE rose by ~0.74C/century (IPCC, 2007) C/century British Columbia Karl and Trenberth, 2003 4 Sea Level Rise and Fall Position of shorelines 18,000 years ago during the last glacial maximum How has average sea level changed through time? Why does sea level change? Global Sea Level Rise EUSTATIC (global) sea level change: 1. Formation & melting of ice sheets ON LAND Since last ice age, sea level rose 120m mostly from melting ice! If remaining ice melts, sea level could rise another 60- 70m (IPCC, 2007) Will all this ice melt? 21 000 yrs ago 5700 yrs ago 5 Global Sea Level Change 2. THERMAL EXPANSION increased volume due to increased ocean water temperature Thermal expansion is the largest contributor to global sea level rise. today!...
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This note was uploaded on 04/01/2010 for the course EOSC 114 EOSC 114 taught by Professor Stull during the Spring '10 term at The University of British Columbia.

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Waves_5 - 1 EOSC 114 / Guillaume Carazzo Earthquakes...

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