Ferg_ch12_II

Ferg_ch12_II - Ch 12: Severe weather wikimedia.org Extreme...

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Unformatted text preview: Ch 12: Severe weather wikimedia.org Extreme Heat Long or short timescales Long timescale: Plate movement, oceans opening and closing large regions may be cut off from moisture, into desert conditions Short timescale: Changes in jet stream, atmospheric convergence zones may keep moisture away for many years drought conditions Shorter timescale: Heat wave Drought Drought: extended period of deficient water in a region Reduced oceanic air masses over land (El Nino) early Australians did not adopt agriculture Overfarming, excessive irrigation, deforestation Diminished crop and livestock production Increased erosion dust storms, desertification Famine, malnutrition, human displacement, disease, war , wildfires ... Drought The Dust Bowl in Canada and USA 1930-1940 Severe drought, agriculture no crop rotation killed erosion-preventing grasses 2.5 million displaced in USA, 70% of rural S AB and SK require aid blogs.ancestry.com wikimedia.org Famine Famine: human food capacity of a region exceeded Starvation: Food energy imbalance on the consumption side leading to death WHO: 'hunger is the gravest single threat to the world's public health ... ... malnutrition is by far the biggest contributor to child mortality, present in half of all cases' Famine 70 M deaths in 20th century 30 M 195861 in China 19421945 Bengal China in 1928 and 1942 USSR 1932-33 Stalin's famine Biafra1960s Cambodia 1970s Ethiopia 198385 North Korea 1990s 10 million Kenyans face starvation today Famine Current causes: overpopulation, conflict, soil / groundwater exhaustion, drought, rising oil prices, use of biofuels, increased demand for meat in Asia. Heat Wave Hyperthermia when human body reaches 105 o F Deaths occurred for days after a heatwave Heat is the biggest killer of all severe weather USA 1992 - 2001, heat mortality: 2,190, flood mortality: 880, hurricane mortality: 150 Figure 12.10 Chicago 1995 wikimedia.org Heat Wave Europes Heat Wave, 2003 Summer heat waves Deaths over 35,000 Heat waves incidence expected to increase as climate warms Midlatitude Cyclones Northern Hemisphere cyclone : counterclockwise air mass rotating around low-pressure core Large scale: trough in jet stream juxtaposes northern cold front and southern warm front line of thunderstorms Northeastern U.S.: low-pressure system moving up Atlantic Northeastern U....
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Ferg_ch12_II - Ch 12: Severe weather wikimedia.org Extreme...

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