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Modified over 5 years ago
1 Trade Winds in Equatorial Pacific
2 ITCZ Location July January ITCZ
3 Equatorial Divergence vs Subtropical Convergence upwellingdownwelling
4 Trade Winds Cause Variations in Sea Surface Height ITCZ SSH
5 Meridional Trends in Trade Wind Strength, Sea Surface Height, and Currents in the Equatorial Pacific Trade Wind Speed Surface Current Direction SSH (cm) Depth (m) HPG westward eastward ITCZ I------Conv------IDivIConI-Div-I---Conv---I
6 Zonal (E-W) Trend in Sea Surface Height Zonal (east-west) trend in Sea Surface Height Wind Stress SSH Temperature (+ = depth of EUC)
7 Equatorial Undercurrent AAAA 6 EUC Velocity (m/s) Temperature (ºC) Velocity Cross Sections
8 SST in Equatorial Pacific ºC
9 Surface Nitrate Distribution
10 Photosynthesis Rates in Surface Ocean
11 Cross Sections in the Equatorial Pacific Temp Salinity Oxygen Phosphate Zonal Vel.
12 Effect of El Nino on Anchovy Catch El Ninos in red
13 Array of Buoys Monitored by NOAA for Wind Speed, SST, Salinity, Current Velocities The best instrumented region of the world’s ocean
14 Sea Surface Temperature Changes
15 Weakening of Trade Winds during El Nino Normal El Nino
16 Atmospheric Circulation and Precipitation Changes during El Nino Normal El Nino
17 SST and Chlorophyll during El Nino El Nino Normal 9
18 Animation of SST Anomalies during El Nino of 1997 http://www.cdc.noaa.gov/map/clim/sst_olr/ old_sst/sst_9798_anim.shtmlhttp://www.cdc.noaa.gov/map/clim/sst_olr/ old_sst/sst_9798_anim.shtml
19 History of Southern Oscillation Index (and correlation with El Nino events) ENSO Index
20 Change in Zonal Atmospheric Circulation in Equatorial Pacific
21 Global Weather Anomalies during El Nino
22 Global Weather Anomalies during La Nino
23 El Nino Effects on US Temperatures (Winter) Warmer in northern midwest and cooler in south
24 El Nino Effects on US Precipitation (Winter) Wetter in southeast US
25 El Nino Effects on Jet Stream position and US Weather
26 Currently El Nino Conditions (Nov 2009) SST anomaly is currently 1-4ºC warmer than normal (avg.= 1.5ºC).
Current Variations Not all currents are driven by the wind.
Normal Conditions. The Walker Circulation El Niño Conditions.
ENSO El Niño Southern Oscillation Pages NORMAL conditions Trade Winds Cool water pools near S.America, Warm water pools near Australia.
El Niño. How do ocean currents affect weather and climate? Oceans store and transport heat. – High heat capacity – Stores and transports energy from the.
Ocean and Atmosphere Coupling El-nino -- Southern Oscillation
El Niño/Southern Oscillation Major climatic perturbation on the planet Coupled atmosphere ocean process Key is the western tropical Pacific – Ascending.
El Nino, La Nina, and their Affects in Oklahoma. El Nino Conditions Warming of central and eastern equatorial Pacific waters Trade wind differences –
ENSO (El Nino Southern Oscillation) ENVS
2. Natural Climate Variability
SSH anomalies from satellite. Observed annual mean state Circulation creates equatorial cold tongues eastern Pacific Trades -> Ocean upwelling along Equator.
1 Surface Circulation Pathways Generally, warm currents move poleward and cool currents move equatorward.
El Nino – Southern Oscillation - Southern Oscillation (atmosphere) - El Nino (ocean) - change in equatorial Pacific circulation - produces global climate.
Generalized Surface Circulation
Chapter 5: Other Major Current Systems
El Nino Southern Oscillation (ENSO)
Lesson 11: El Niño Southern Oscillation (ENSO) Physical Oceanography
What Are the El Nino and La Nina?
Remember “normal” ocean circulation? El Nino? (warm) Trade winds weaken Thermocline drops Upwelling is cut off SST rises in E.Pacific High & Low pressure.
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