1 / 21

1000 m

200 m. 1000 m. Fig. 31.1 (EFB). Ocean Productivity and Circulation:. Winds countercurrents Ekman spirals Langmuir cells. Fig. 2.10 (EFB). Ekman Spiral. form in hours to days. Fig. 31.5 (EFB). Langmuir Cells. form in minutes to hours. Fig. 31.4 (EFB).

hallie
Download Presentation

1000 m

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 200 m 1000 m Fig. 31.1 (EFB)

  2. Ocean Productivity and Circulation: • Winds • countercurrents • Ekman spirals • Langmuir cells

  3. Fig. 2.10 (EFB)

  4. Ekman Spiral form in hours to days Fig. 31.5 (EFB)

  5. Langmuir Cells form in minutes to hours Fig. 31.4 (EFB)

  6. Ocean Productivity and Circulation: • Winds • countercurrents • Ekman spirals • Langmuir cells 2. Thermohaline circulation lower temperature + greater salinity = greatest density

  7. Ocean Productivity and Circulation: • Winds • countercurrents • Ekman spirals • Langmuir cells 2. Thermohaline circulation 3. Upwelling

  8. Upwelling Upwelling

  9. Normal Conditions H H March – July position of high pressure zones Cold-water upwelling intensifies

  10. Normal Conditions H H August - December position of high pressure zones Warm waters dominate inshore

  11. Davidson Current El Niño Current

  12. Davidson Current El Niño Current Aug-Dec shift

  13. H H March shift in El Niño Southern Oscillation (ENSO) Cold-water upwelling absent

  14. ENSO Early Warning Signs • Higher SSTs, track Kelvin wave W to E • Absence of cold-water upwelling on • California coast • Unusual marine organisms • barracudas, mako sharks, tropical fish to north • Failure of nesting seabirds

  15. ENSO Global Impacts • Droughts in interior continents: • Southwest U.S., SE Asia, Australia, S. Africa • Floods in coastal CA, Peru • More tropical storms, hurricanes • in Pacific • Decline in fisheries

  16. H H March shift in La Niña year following ENSO event Cold-water upwelling intensified

  17. La Niña Global Impacts • Intensified cold-water upwelling • More tropical storms, hurricanes • in Atlantic • Increase in fisheries

  18. ENSO in Antarctica = more sea ice = more productivity

More Related