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El Niňo. El Nińo: A significant increase in sea surface temperature over the eastern and central equatorial Pacific that occurs at irregular intervals,

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Presentation on theme: "El Niňo. El Nińo: A significant increase in sea surface temperature over the eastern and central equatorial Pacific that occurs at irregular intervals,"— Presentation transcript:

1 El Niňo

2 El Nińo: A significant increase in sea surface temperature over the eastern and central equatorial Pacific that occurs at irregular intervals, generally ranging between two and seven years (glossary.ametsoc.org).

3 Off the west coasts of continents, the Sea Surface Temperature is chilly. Fish love the cold water, especially anchovies.

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5 During El Nińo, SST changes dramatically near Peru

6 The SST changes have really big consequences for the atmosphere.

7 This is the development of the most intense El Nińo ever recorded in 1997-98.

8 Sea Surface Anomalies during 2015

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14 So, what happens during El Nińo? The normal mean pressure features are these: 1. The Subtrop High moves south or weakens 2. Trade winds get weaker or reverse 3. The Aleutian Low strengthens

15 H H L L For January, 1998, this was the 1000 mb (surface) Mean values Departures from the 30- year mean (Anomalies)

16 At 250 mb, there were changes caused by the surface pressure and temperature anomalies Mean values Departures from the 30-year mean (Anomalies)

17 Look at the effect on the 250 mb wind (the Jet Stream!) Mean values Departures from the 30- year mean (Anomalies) The much stronger subtropical Jet Stream explains all the U.S. anomalies

18 La Niňa

19 This is the La Niňa event of 2006-07

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21 This is the latest drought map.

22 The ENSO cycles vary in length and intensity ~ 6-18 months. There have been several big events in the last 20 years. From www.esrl.noaa.gov/psd/enso/mei/

23 Other circulation patterns and their effects NAO: North Atlantic Oscillation AO: Arctic Oscillation PNA: Pacific/North American (oscillation) PDO: Pacific Decadel Oscillation The figures shown are from www.nc-climate.ncsu.edu/climate/patterns

24 NAO (North Atlantic Oscillation) As the name tells us, this is a pattern located in the North Atlantic Ocean.

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27 From: https://crudata.uea.ac.uk/~timo/datapages/nao_ts.gif

28 AO (Arctic Oscillation) Here we are just interested in the Arctic. From http://www.nc-climate.ncsu.edu/climate/patterns/NAO.html

29 From: www.cpc.noaa.gov/products/precip/CWlink/daily_ao_index/month.ao.gif

30 PNA (Pacific North American Oscillation

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32 PDO (Pacific Decadel Oscillation) Warm Phase Cold Phase

33 From: www.cpc.ncep.noaa.gov/products/GODAS/ocean_briefing_gif/global_ocean_monitoring_current.pdf

34 Next: Climate Change


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