gcm scenarios for regional studies over west africa
Download
Skip this Video
Download Presentation
GCM Scenarios for Regional Studies over West Africa

Loading in 2 Seconds...

play fullscreen
1 / 36

GCM Scenarios for Regional Studies over West Africa - PowerPoint PPT Presentation


  • 78 Views
  • Uploaded on

GCM Scenarios for Regional Studies over West Africa. Gregory S. Jenkins Department of Meteorology Penn State University. “Africa is Highly Vulnerable to Climate Change.” IPCC 2001.

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 ' GCM Scenarios for Regional Studies over West Africa' - sauda


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
gcm scenarios for regional studies over west africa

GCM Scenarios for Regional Studies over West Africa

Gregory S. Jenkins

Department of Meteorology

Penn State University

slide3

“Impact of particular concern that are of particular concern to Africa are related to water resources, food production, human health, desertification and coastal zones especially in relation to extreme events.”IPCC 2001

objectives of presentation
Objectives of Presentation
  • -Compare NCAR CCM3, CCSM v.1 to NCEP
  • -Identify Biases in models
  • Compare 20-21st century climates of West Africa (5-35N, 20W-40E)
  • CCM3 (Kiehl et al. 1998) - Climatological SSTs
  • CCSM version 1 (Boville and Gent, 1998)
west african features examined for 20 21st century simulations
200 hPa zonal winds- Tropical Easterly Jet- (TEJ)

700 hPa zonal winds - African Easterly Jet (AEJ)

Precipitation field

African Easterly waves

Meridional temperature gradient

Sea Level pressure fields.

West African Features examined for 20-21st century simulations
african easterly waves
African Easterly Waves
  • African easterly waves have
  • 3-5 day periods (Meridional winds) -Burpee, 1972
  • 6-9 day periods - Diedhiou et al. 1999
  • AEJ is modulated on similar time periods.
sahara warming
Sahara Warming

Why does the Sahara warm more with elevated GHGs?

  • Total warming = increased IR forcing + warm advection (Europe).
  • Feedbacks small
  • Warming shared between Sahara and Europe!
conclusion
Conclusion
  • West Africa simulated better in A1 simulations relative to CCM3 but for wrong reasons.
  • AEJ, AEWs better simulated in CCSM v.1
  • 21st century warming in West Africa uncertain because of competing factors of warm advection from Europe and land use change in West Africa.
  • AEJ frequency shifted to longer timescale in 21st century.
  • CCSM v.1 can be used as boundary conditions for regional climate model simulations.
ad