introduction to ocean circulation geography 163 n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Introduction to Ocean Circulation - Geography 163 PowerPoint Presentation
Download Presentation
Introduction to Ocean Circulation - Geography 163

Loading in 2 Seconds...

play fullscreen
1 / 42

Introduction to Ocean Circulation - Geography 163 - PowerPoint PPT Presentation


  • 71 Views
  • Uploaded on

Introduction to Ocean Circulation - Geography 163. Wind-driven circulation of major gyres & surface currents Buoyancy-driven circulation linking the major gyres & the global conveyor belt Coastal circulations & land-ocean interactions Build from physical principles (w/out math). Approach.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Introduction to Ocean Circulation - Geography 163' - webb


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.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
introduction to ocean circulation geography 163
Introduction to Ocean Circulation - Geography 163
  • Wind-driven circulation of major gyres & surface currents
  • Buoyancy-driven circulation linking the major gyres & the global conveyor belt
  • Coastal circulations & land-ocean interactions
  • Build from physical principles (w/out math)
approach
Approach
  • First principles do “work”
  • Build descriptions from first principles
  • Do not bludgeon students with calculus
  • Work with available data sets
why do we care
Why do we care?
  • Climate
    • Global heat & water cycles
    • Weather & weather/climate prediction
  • Global biogeography & biogeochemistry
    • Species ranges & adaptation to global change
    • Fossil fuel CO2 sequestration
  • Marine resources
    • Renewable (fisheries)
    • Non-renewable (oil, etc.)
slide7

Global Climate

Change

IPCC [2007]

global heat transport
Global Heat Transport

How can it be constant?

global heat transport2
Global Heat Transport

1015 W = 1 Petawatt

sst departures o c in the tropical pacific during the last 4 weeks
SST Departures (oC) in the Tropical Pacific During the Last 4 Weeks
  • During the last 4-weeks, equatorial SSTs were more than 1.0°C above average between 165°E and 120°W and near the western S. American coast.
ni o region sst departures o c recent evolution
Niño Region SST Departures (oC) Recent Evolution

The latest weekly SST departures are:

Niño 4 1.0ºC

Niño 3.4 1.1ºC

Niño 3 0.7ºC

Niño 1+2 0.1ºC

recent evolution of equatorial pacific sst departures o c
Recent Evolution of Equatorial Pacific SST Departures (oC)

Since the beginning of June 2009, SST anomalies have been at least +0.5°C across most of the equatorial Pacific.

During December 2009, positive SST anomalies increased across much of the equatorial Pacific.

From late December 2009 to mid-February 2010, positive SST anomalies decreased across portions of the central and east-central Pacific.

Recently, positive SST anomalies have decreased over the central Pacific.

Time

Longitude

npp climate
NPP & Climate

NPP = Net Primary Production

rate of C fixed by phytoplankton

Chlorophyll is found in all plants & phytoplankton

Averages are from persistently warm ocean (SST> 15C)

From Behrenfeld et al. [2006]

co 2 sequestration
CO2 Sequestration

It’s gotta go somewhere...

co 2 sequestration1
CO2 Sequestration

This is where.

climate fish
Climate & Fish

Pacific Decadal Oscillation

Warm phase - southern

Cool phase - northern

We’re now in a cool phase…

introduction to ocean circulation geography 1631
Introduction to Ocean Circulation - Geography 163
  • Wind-driven circulation of major gyres & surface currents
  • Buoyancy-driven circulation linking the major gyres & the global conveyor belt
  • Coastal circulations & land-ocean interactions
scales
Scales
  • Ocean basins are wide & shallow
    • Typical scales are 104 km across and 5 km deep
    • “Spit on a basketball”
  • Aspect ratio has important implications
    • Horizontal velocities are >> vertical velocities
    • Horizontal property changes are << vertical ones
atlantic temperature
Atlantic Temperature

eWOCE gallery – www.ewoce.org

coastal upwelling2
Coastal Upwelling

July 1992

AVHRR Ch 4

summary
Summary
  • Importance of large-scale ocean circulation
    • climate, biogeochemistry, marine resources
  • Characteristic “Types” of Ocean Circulation
    • Patterns of circulation can be generalized for different regions
    • Suggests that dynamical processes are the same
    • Wind-driven, Buoyancy-driven & Coastal
  • Scales - “spit on a basketball”