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Accra, Ghana
25-26 July 2019
bit.ly/ipcc_outreach_ghana
Projections of future climate change in Africa –
the physical science base
Prof. Francois Engelbrecht
Tropical Cyclone Idai just before making landfall over
Beira on 14 March 2018.
http://www.sat.dundee.ac.uk/geobrowse/geobrowse.php. Meteosat Second
Generation (MSG) infra-red satellite image.
Cyclone Idai’s flooding caused an “inland lake” to form west of
Beira, as depicted on this image (red) of the European Space
Agency satellite Copernicus Sentinel-1 taken on 19 March 2019
http://www.esa.int/spaceinimages/Images/2019/03/Floods_imaged_by_Copernicus_Sentinel-1
Largest flood disaster in recorded history in southern Africa
Humans are changing the climate
Year
Globally averaged combined land and ocean surface
temperatures
It is extremely likely that we are the dominant cause of warming
since the mid-20th century
AR5 WGI SPM
• Under low mitigation we will reach 1.5°C
between 2030 and 2052
© CSIR 2007 www.csir.co.za
Observed
trends in
annual-average
temperatures
over Africa
1961-2010
(Engelbrect et
al., 2015; ERL
10: 085004)
Garland et al.,
2015; Int J of
Env Res and
Public Health
From CSIRO: Martin Dix
Projected temp anomalies for 2081-
2100 relative to pre-industrial
conditions (0-degree world)
AR5 WG1 estimations relative to
1986-2005 were adjusted with a 0.6
°C factor
Only RCP 2.6 can safely keep us well
below the Cancun agreed 2 °C (Long
Term Global Goal), whilst the world is
currently between A2 and RCP8.5
Emission Scenarios and Representative Concentration
Pathways
Scenario Temp anomalies relative to pre-
industrial (adapted from AR5)
RCP 2.6 0.9 to 2.3
RCP 4.5 1.7 to 3.2
RCP 6 2.0 to 3.7
RCP 8.5 3.2 to 5.4
2.6
Global and Regional Climate Models are the
main tools to project future climate change
Based on the Laws of
Physics
Simulates the coupled
ocean-atmosphere-land
processes of the Earth
System
Parameterisation of
processes that can’t be
resolved at a given grid
resolution
IPCC Assessments make
use of multi-model
ensembles to describe
uncertainty range
associated with the
projections for a number
of emission scenarios
A regional model’s stretched-grid over Africa
© CSIR 2007 www.csir.co.za
Simulations of African
climate change using a
regional climate model
Downscaling various
CMIP5/AR5 CGCMs for
different RCPs
Wits CSIR-CSIRO collaboration
towards CMIP6, CORDEX
Martin Dix, CSIRO
© CSIR 2007 www.csir.co.za
Martin Dix, CSIRO
Simulations of African
climate change using a
regional climate model
Downscaling various
CMIP5/AR5 CGCMs for
different RCPs
Wits CSIR-CSIRO collaboration
towards CMIP6, CORDEX
Jason Florio / Aurora Photos
• Unprecedented heat-waves in tropical and
southern Africa with direct impacts on human
comfort, health and mortality
• Tipping point in maize production at ~ 3 °C of
global warming: large crop losses/collapse of
maize crop; tipping point in cattle production in
subtropical southern and North Africa at ~ 3 °C of
global warming: cattle industry no longer
sustainable
• Unprecedented droughts may occur in southern
Africa, leading to “day zero” events
Impacts of global warming in
Africa beyond 2 °C of global
warming
Robert van Waarden / Aurora Photos
• To limit warming to 1.5°C, CO2 emissions
fall by about 45% by 2030 (from 2010
levels)
• To limit warming to 1.5°C, CO2 emissions
would need to reach ‘net zero’ around 2050
• Reducing non-CO2 emissions would have
direct and immediate health benefits
Compared to 25% for 2°C
Compared to around 2070 for 2°C
Greenhouse gas emissions
pathways
The Choices We Make Will Create Different Outcomes
With substantial
mitigation
Without
additional
mitigation
Change in average surface temperature (1986–2005 to 2081–2100)
AR5 WGI SPM
Substantial benefits in terms of reduced impacts if global warming
can be restricted to 1.5 °C (SR1.5)
IPCC AR5 Synthesis Report
What actions
can we take?
IPCC
IPCC
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Find us on:
Website: http://ipcc.ch/
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THANK YOU FOR YOUR ATTENTION!
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Projections of future climate change in Africa – The physical science base

  • 1. Accra, Ghana 25-26 July 2019 bit.ly/ipcc_outreach_ghana Projections of future climate change in Africa – the physical science base Prof. Francois Engelbrecht
  • 2. Tropical Cyclone Idai just before making landfall over Beira on 14 March 2018. http://www.sat.dundee.ac.uk/geobrowse/geobrowse.php. Meteosat Second Generation (MSG) infra-red satellite image.
  • 3. Cyclone Idai’s flooding caused an “inland lake” to form west of Beira, as depicted on this image (red) of the European Space Agency satellite Copernicus Sentinel-1 taken on 19 March 2019 http://www.esa.int/spaceinimages/Images/2019/03/Floods_imaged_by_Copernicus_Sentinel-1 Largest flood disaster in recorded history in southern Africa
  • 4. Humans are changing the climate Year Globally averaged combined land and ocean surface temperatures It is extremely likely that we are the dominant cause of warming since the mid-20th century AR5 WGI SPM • Under low mitigation we will reach 1.5°C between 2030 and 2052
  • 5. © CSIR 2007 www.csir.co.za Observed trends in annual-average temperatures over Africa 1961-2010 (Engelbrect et al., 2015; ERL 10: 085004) Garland et al., 2015; Int J of Env Res and Public Health
  • 6. From CSIRO: Martin Dix Projected temp anomalies for 2081- 2100 relative to pre-industrial conditions (0-degree world) AR5 WG1 estimations relative to 1986-2005 were adjusted with a 0.6 °C factor Only RCP 2.6 can safely keep us well below the Cancun agreed 2 °C (Long Term Global Goal), whilst the world is currently between A2 and RCP8.5 Emission Scenarios and Representative Concentration Pathways Scenario Temp anomalies relative to pre- industrial (adapted from AR5) RCP 2.6 0.9 to 2.3 RCP 4.5 1.7 to 3.2 RCP 6 2.0 to 3.7 RCP 8.5 3.2 to 5.4 2.6
  • 7. Global and Regional Climate Models are the main tools to project future climate change Based on the Laws of Physics Simulates the coupled ocean-atmosphere-land processes of the Earth System Parameterisation of processes that can’t be resolved at a given grid resolution IPCC Assessments make use of multi-model ensembles to describe uncertainty range associated with the projections for a number of emission scenarios A regional model’s stretched-grid over Africa
  • 8. © CSIR 2007 www.csir.co.za Simulations of African climate change using a regional climate model Downscaling various CMIP5/AR5 CGCMs for different RCPs Wits CSIR-CSIRO collaboration towards CMIP6, CORDEX Martin Dix, CSIRO
  • 9. © CSIR 2007 www.csir.co.za Martin Dix, CSIRO Simulations of African climate change using a regional climate model Downscaling various CMIP5/AR5 CGCMs for different RCPs Wits CSIR-CSIRO collaboration towards CMIP6, CORDEX
  • 10. Jason Florio / Aurora Photos • Unprecedented heat-waves in tropical and southern Africa with direct impacts on human comfort, health and mortality • Tipping point in maize production at ~ 3 °C of global warming: large crop losses/collapse of maize crop; tipping point in cattle production in subtropical southern and North Africa at ~ 3 °C of global warming: cattle industry no longer sustainable • Unprecedented droughts may occur in southern Africa, leading to “day zero” events Impacts of global warming in Africa beyond 2 °C of global warming
  • 11. Robert van Waarden / Aurora Photos • To limit warming to 1.5°C, CO2 emissions fall by about 45% by 2030 (from 2010 levels) • To limit warming to 1.5°C, CO2 emissions would need to reach ‘net zero’ around 2050 • Reducing non-CO2 emissions would have direct and immediate health benefits Compared to 25% for 2°C Compared to around 2070 for 2°C Greenhouse gas emissions pathways
  • 12. The Choices We Make Will Create Different Outcomes With substantial mitigation Without additional mitigation Change in average surface temperature (1986–2005 to 2081–2100) AR5 WGI SPM Substantial benefits in terms of reduced impacts if global warming can be restricted to 1.5 °C (SR1.5)
  • 13. IPCC AR5 Synthesis Report What actions can we take?
  • 14. IPCC IPCC http://www.slideshare.net/ipcc-media/presentations https://www.youtube.com/ipccgeneva Find us on: Website: http://ipcc.ch/ IPCC Secretariat: ipcc-sec@wmo.int IPCC TG-FWLGST: ipcc-alignment@wmo.int @IPCC_CH https://www.linkedin.com/company/ipcc https://www.flickr.com/photos/ipccphoto/sets/ https://vimeo.com/ipcc THANK YOU FOR YOUR ATTENTION! For more information: