PSU GEOSC 320 - ENSO and Climate Change (17 pages)

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ENSO and Climate Change



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ENSO and Climate Change

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Pages:
17
School:
Pennsylvania State University
Course:
Geosc 320 - Geology of Climate Change

Unformatted text preview:

ENSO and Climate Change Tiffaney Stoy April 18 2003 Questions to keep in mind 1 What is ENSO What causes it 2 What proxies help determine El Nino La Nina occurrences 3 What general climatic effects does ENSO have around the globe 4 What was ENSO like in the past 5 What theories exist about the future of ENSO Will anthropogenic effects change the variability of ENSO What is ENSO El Nino Southern Oscillation Warming of eastern Pacific which occurs when prevailing tradewinds die down allowing warm water to migrate eastward warm waters warm the atmosphere causing strange weather patterns Sea level falls in the west and rises in the east by as much as 25 cm Reduced upwelling in eastern Pacific strengthening temperature anomaly Occurs roughly every 3 to 7 years La Nina is the opposite occurs with onset of opposite effects cooler conditions occurs about a year or so after El Nino Can be determined by the SOI Southern Oscillation Index Means little boy in Spanish El Nino Effects Intense rainfall in areas Severe drought in other areas such as over Australia and Indonesia Weakened Summer Monsoon season in South Asia Water borne diseases hepatitis cholera as well as Vector borne diseases malaria yellow fever have cycles associated with El Nino Increase in Pacific tropical cyclones Broad influence of global economy In America NW and Great Plains wet Northeast dry An El Nino Study conducted by Matt Sittel of the Florida State University El Nino effects on the U S Warmer temperatures in the southeast cooler temperatures in the northwest Wetter in the Rockies midwest Ohio Valley extreme northwest and New England Drier in the extreme southeast and parts of California What Proxies help to understand past El Nino s occurrences Corals 150 year record SST conditions upwelling salinity precipitation river runoff all linked to large scale variability Radiocarbon concentrations changes in upwelling thermocline Low upwelling El Nino High 14C and vice versa El Nino Negative delta 18O



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