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Climate Change - Prof Michael Bird
1. Anthropogenic climate change:
an update
Michael Bird
Earth and Environmental Science and
Centre for Tropical Environmental and
Sustainability Science (TESS)
James Cook University
Michael.bird@jcu.edu.au
2. outline
• What does the latest
IPCC report say the
future holds for us all?
• What does
anthropogenic climate
change mean for us
here (in the tropics)?
• What happened to
climate change as a
political issue?
5. IPCC - oceans
• Ocean warming dominates
the increase in energy
stored in the climate system,
accounting for more than
90% of the energy
accumulated between 1971
and 2010 (high confidence).
• The global ocean will
continue to warm during the
21st century. Heat will
penetrate from the surface
to the deep ocean and affect
ocean circulation.
6. IPCC - oceans
• The rate of sea level rise
since the mid-19th century
has been larger than the
mean rate during the
previous two millennia (high
confidence).
• Over the period 1901–2010,
global mean sea level rose
by 0.19 [0.17 to 0.21] m.
• Under all RCP scenarios the
rate of sea level rise will
very likely exceed that
observed during 1971–2010
(range 0.26 -0.82m to 2100)
7. IPCC - ice
• Over the last two decades, the Greenland
and Antarctic ice sheets have been losing
mass, glaciers have continued to shrink
almost worldwide, and Arctic sea ice and
Northern Hemisphere spring snow cover
have continued to decrease in extent
(high confidence).
• It is very likely that the Arctic sea ice
cover will continue to shrink and thin and
that Northern Hemisphere spring snow
cover will decrease during the 21st
century as global mean surface
temperature rises. Global glacier volume
will further decrease.
8. IPCC - water
• Changes in the global water
cycle in response to the
warming over the 21st
century will not be uniform.
• The contrast in precipitation
between wet and dry regions
and between wet and dry
seasons will increase,
although there may be
regional exceptions.
10. Us - in general…
• The tropics have expanded by
1-3˚ latitude N and S since
1979, as determined by several
measures
• ‘poleward movement of largescale atmospheric circulation
systems, such as jet streams
and storm tracks, could result in
shifts in precipitation patterns
affecting natural ecosystems,
agriculture, and water
resources.’ – Seidel et al., 2008
Lucas et al. (2013) The expanding tropics: a critical assessment… WIREs Clim Change doi: 10.1002/wcc.251
11. Us - temperature
•
•
•
•
Each decade warmer than the
previous decade since the 1950s.
average daily mean temperatures
have increased by 0.9°C since
1910.
2010 and 2011 were Australia’s
coolest years recorded since 2001
due to two consecutive La Niña
events.
It will get hotter and there will be
more extremes of temperature
http://www.csiro.au/Outcomes/Climate/Understanding/State-of-the-Climate-2012.aspx
12. Us - temperature
•
Williams et al. (2003) ‘Extinction rates caused by the complete loss of core
environments are likely to be severe, nonlinear, with losses increasing
rapidly beyond an increase of 2°C...’ (and then there’s the GBR…)
13. • Sea levels will increase
• Storm surges will have
more impact
• Coastal erosion and
inundation will be more
prevalent
• NQLD has seen faster
rates of rise than
average
http://www.csiro.au/Outcomes/Climate/Understanding/State-of-the-Climate-2012.aspx
14. Us - water
• Intensification of the
water cycle may not
change amount of rain
too much, but
variability will increase
as will extremes
• Maybe not more
cyclones, but more
intense cyclones
http://www.csiro.au/Outcomes/Climate/Understanding/State-of-the-Climate-2012/Temperature.aspx
15. Us – it will happen sooner…
• Mora et al. (2013) world will
move to ‘unprecedented
climates’ between 2047 (low
emissions) and 2069 (high
emissions)
• ‘will occur earliest in the tropics
and among low-income
countries, highlighting the
vulnerability of global
biodiversity and the limited
governmental capacity to
respond to the impacts of
climate change.’
17. And finally…
• There is overwhelming scientific consensus as
to the reality of anthropogenic climate change
John Cook et al 2013 Environ. Res. Lett. 8 024024 doi:10.1088/1748-9326/8/2/024024
18. But…
• Nothing I say will change
your mind..
• How do we decide our position?
– Science comprehension theory
– Identity-protective cognition theory
• Kahan et al. (2013) ‘subjects…use
their quantitative-reasoning capacity
selectively to conform their
interpretation of the data to the
result most consistent with their
political outlooks’
http://www.skepticalscience.com
Derived from salinity time series – evaporating water is getting saltier, precipitating water is getting fresher
Fig. 5. (a) The 1950–2000 climatological-mean surface salinity. Contours every 0.5 pss are plotted in black. (b) The 50-yr linear surface salinity trend [pss (50 yr)−1]. Contours every 0.2 are plotted in white. Regions where the resolved linear trend is not significant at the 99% confidence level are stippled in gray. (c) Ocean–atmosphere freshwater flux (m3 yr−1) averaged over 1980–93 (Josey et al. 1998). Contours are every 1 m3 yr−1 in black.
Durack, Paul J., Susan E. Wijffels, 2010: Fifty-Year Trends in Global Ocean Salinities and Their Relationship to Broad-Scale Warming. J. Climate, 23, 4342–4362.
Seidel et al. (2008) Widening of the tropical belt in a changing climate doi:10.1038/ngeo.2007.38
Changes in average temperature for Australia for each year (orange line) and each decade (grey boxes), and 11-year average (black line – an 11-year period is the standard used by the Intergovernmental Panel on Climate Change). Anomalies are the departure from the 1961-1990 average climatological period. The average value for the most recent 10-year period (2002–2011) is shown in darker grey.
Increase in annual average daily mean temperature from 1960 to 2011 (in °C). Most of Australia has experienced warming over the past 50 years, with some areas experiencing warming since 1960 of up to 1 °C.
Each decade has been warmer than the previous decade since the 1950s.
Australian annual average daily maximum temperatures have increased by 0.75 °C since 1910.
Australian annual average daily mean temperatures have increased by 0.9°C since 1910.
Australian annual average overnight minimum temperatures have warmed by more than 1.1 °C since 1910.
2010 and 2011 were Australia’s coolest years recorded since 2001 due to two consecutive La Niña events.
In the past 12-month period a large number of temperature records have fallen across Australia including:
Australia’s hottest summer day on record (7 January)
Australia’s warmest winter day on record (31 August)
Australia’s hottest month on record (January)
Australia’s hottest summer on record
Australia’s hottest January to August period on record
Australia’s warmest 12-month period on record
The rate of sea-level rise around Australia as measured by coastal tide gauges (circles) and satellite observations (contours) from January 1993 to December 2011.
Global average mean sea level for 2011 was 210 mm above the level in 1880.
Global average mean sea level rose faster between 1993 and 2011 than during the 20th century as a whole.
April to September (autumn and winter) rainfall deciles from 1997 to 2011 for Australia (a decile rainfall map shows whether the rainfall is above average, average or below average for the most recent 15-year period, in comparison with the entire rainfall record from 1900). Areas of highest on record and lowest on record are also shown.
Unprecedented = state continuously outside the bounds of historical variability
http://www.viewsoftheworld.net/
Australia generates about 1.5% of global greenhouse gas emissions. However, on a per capita basis, Australia is one of the world's largest polluters. For the year to June 2012, our national inventory emissions per capita were about 24.4 tonnes carbon dioxide equivalent (CO2e) per person. Only a few countries in the world rank higher — Bahrain, Bolivia, Brunei, Kuwait and Qatar.
Kahan, Dan M. and Peters, Ellen and Dawson, Erica Cantrell and Slovic, Paul, Motivated Numeracy and Enlightened Self-Government (September 3, 2013). Available at SSRN: http://ssrn.com/abstract=2319992 or http://dx.doi.org/10.2139/ssrn.2319992
respondents performed wildly differently on what was in essence the same basic problem, simply depending upon whether they had been told that it involved guns or whether they had been told that it involved a new skin cream.
doi:10.1038/nature12540
Mora et al., (2013) The projected timing of climate departure from recent variability
Tropics go first because climate varibility in a lot of it tends to be low, so its easier to recognize when you are out of the previous bounds.