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IPCC SYR Longer Report (2023)
Asia is the region with the largest population exposed to coastal flooding
Relative sea level change
Chronic high tide flooding
Extreme sea level events
Coastal flooding
Salinization
Coastal erosion
Submergence
Coastal impacts
Ecosystems
Human livelihoods
Infastructure
Food and water security
Cultural heritage
Existence of cities
Local relative sea level rise increases the profile of risks to coastal cities
IPCC WGII report (2022)
most intense tropical cyclones
heavy precipitation
marine heatwaves
ocean acidifiation
↑
Global mean sea level is rising at an increasing rate
Global mean sea level rise from 1901 to 2018 : + 0.20 m
unprecedented since at least the last 3000 years
2006 to 2018
+ 3.7 mm/year
1971 to 2006
+ 1.9 mm/year
1901 to 1971
+ 1.3 mm/year
IPCC WGI report (2021)
Heating of the climate system due to emissions of greenhouse gases is causing
global mean sea level rise through ocean warming and the loss of land ice
Human influence on climate is the main driver of
ocean warming and
thermal expansion
glacier
retreat
Greenland
surface
meting
IPCC WGI report (2021)
with long lasting responses
Heating of the climate system due to emissions of greenhouse gases is causing
global mean sea level rise through ocean warming and the loss of land ice
IPCC WGI report (2021)
Greenland and Antarctic ice sheets
Ocean thermal expansion
now dominant
Glaciers
since 1971
x4
1990s to 2020s
Sea level will continue to rise,
but how fast and how much depends on future emissions
IPCC SYR Longer Report (2023)
Increased frequency of extreme sea level events by 2040
IPCC SYR Longer Report (2023)
Responding to sea level rise requires long-term planning
IPCC SYR Longer Report (2023)
Higher greenhouse gas emissions lead to larger and faster sea level rise,
demanding earlier and strong responses, reducing the lifetime of some options
Greenhouse gas
emissions scenarios
Year by which rise of 0.5 m above 1995-2014 is expected
at Ko Si Chang
https://sealevel.nasa.gov/ipcc-ar6-sea-level-projection-tool
Higher greenhouse gas emissions lead to larger and faster sea level rise,
demanding earlier and strong responses, reducing the lifetime of some options
Greenhouse gas
emissions scenarios
Year by which rise of 1 m above 1995-2014 is expected
at Ko Si Chang
https://sealevel.nasa.gov/ipcc-ar6-sea-level-projection-tool

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Coasts, sea and ocean level changes

  • 1. IPCC SYR Longer Report (2023) Asia is the region with the largest population exposed to coastal flooding
  • 2. Relative sea level change Chronic high tide flooding Extreme sea level events Coastal flooding Salinization Coastal erosion Submergence Coastal impacts Ecosystems Human livelihoods Infastructure Food and water security Cultural heritage Existence of cities Local relative sea level rise increases the profile of risks to coastal cities IPCC WGII report (2022) most intense tropical cyclones heavy precipitation marine heatwaves ocean acidifiation ↑
  • 3. Global mean sea level is rising at an increasing rate Global mean sea level rise from 1901 to 2018 : + 0.20 m unprecedented since at least the last 3000 years 2006 to 2018 + 3.7 mm/year 1971 to 2006 + 1.9 mm/year 1901 to 1971 + 1.3 mm/year IPCC WGI report (2021)
  • 4. Heating of the climate system due to emissions of greenhouse gases is causing global mean sea level rise through ocean warming and the loss of land ice Human influence on climate is the main driver of ocean warming and thermal expansion glacier retreat Greenland surface meting IPCC WGI report (2021) with long lasting responses
  • 5. Heating of the climate system due to emissions of greenhouse gases is causing global mean sea level rise through ocean warming and the loss of land ice IPCC WGI report (2021) Greenland and Antarctic ice sheets Ocean thermal expansion now dominant Glaciers since 1971 x4 1990s to 2020s
  • 6. Sea level will continue to rise, but how fast and how much depends on future emissions IPCC SYR Longer Report (2023)
  • 7. Increased frequency of extreme sea level events by 2040 IPCC SYR Longer Report (2023)
  • 8. Responding to sea level rise requires long-term planning IPCC SYR Longer Report (2023)
  • 9. Higher greenhouse gas emissions lead to larger and faster sea level rise, demanding earlier and strong responses, reducing the lifetime of some options Greenhouse gas emissions scenarios Year by which rise of 0.5 m above 1995-2014 is expected at Ko Si Chang https://sealevel.nasa.gov/ipcc-ar6-sea-level-projection-tool
  • 10. Higher greenhouse gas emissions lead to larger and faster sea level rise, demanding earlier and strong responses, reducing the lifetime of some options Greenhouse gas emissions scenarios Year by which rise of 1 m above 1995-2014 is expected at Ko Si Chang https://sealevel.nasa.gov/ipcc-ar6-sea-level-projection-tool