nov 2012 global warming drought trend
DESCRIPTION
A record of drought trends under global warming.TRANSCRIPT
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Drought trends
Dr. Peter Carter
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Drought trends
USA 2012
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Global average temperature increase
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All the worlds best food producing regions are in the Northern hemisphere
Any effect on NH food production increases world food prices severely increasing the Global South’s food insecurity.
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FIGURE 11 | Mean annual sc-PDSI pm for years (a) 1950–1959, (b) 1975–1984, (c) 2000–2009, (using the 22-model ensemble-mean surface air temperature, precipitation, humidity, net radiation, and wind speed used in the IPCC AR4 from the 20th century
Drought under global warming: a review Aiguo Dai Wiley Jan 2011
Increasing global drought 1950-2009
Palmer Drought Severity Index
PDSI
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FIGURE 11 | Mean annual sc-PDSI pm for years (a) 1950–1959, (b) 1975–1984, (c) 2000–2009, (using the 22-model ensemble-mean surface air temperature, precipitation, humidity, net radiation, and wind speed used in the IPCC AR4 from the 20th century
Drought under global warming: a review Aiguo Dai Wiley Jan 2011
Increasing global drought affects most of the worlds best producing regions
Palmer Drought Severity Index
PDSI
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FIGURE 11 | Mean annual sc-PDSI pm for years (a) 1950–1959, (b) 1975–1984, (c) 2000–2009, (using the 22-model ensemble-mean surface air temperature, precipitation, humidity, net radiation, and wind speed used in the IPCC AR4 from the 20th century
Drought under global warming: a review Aiguo Dai Wiley Jan 2011
Increasing regional Northern hemisphere drought 1950-2009
Palmer Drought Severity Index
PDSI
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http://drought.mssl.ucl.ac.uk/drought.html
Palmer Drought Severity index
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Palmer Drought Severity index
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Palmer Drought Severity index
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12 months UCL algorithm
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12 months UCL algorithm
Northern hemisphere
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12 months UCL algorithm
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12 months UCL algorithm
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NASA GISS
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NASA GISS
NH SH
Average temp increase
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Decadal Northern hemisphere warming trend
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Perception of climate change James Hansena,1, Contributed by James Hansen, March 29, 2012
With global warming NH summer heat extremes are increasing.
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Rapid loss of Far North and Arctic snow and ice albedo cooling could be expected to increase NH drought. Research indicates the jet stream is being altered with a tendency to prolonging droughts.
Rapid 2012 record loss of Arctic albedo cooling
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It is thought that the faster retreat of the spring-summer far North snow cover is a big part of increasing NH drought. Variation from the post-1967 historical norm in June snow cover, June 2012. Dark orange corresponds to between 75 and 100 percent below average. Image: From Rutgers University Climate Lab
Northern Hemisphere
Visible Satellite Monthly Departure (from 1971-2000 mean)
June 2012 record loss of Arctic snow cover albedo cooling
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http://bprc.osu.edu/wiki/Greenland_Ice_Albedo_Monitoring
Less albedo reflection cooling
July 2012 record Greenland ice surface loss of albedo cooling Melt water covering the Greenland ice surface lowers albedo
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2012 record loss of Arctic sea ice albedo and record loss of Greenland albedo cooling