Overview-phase2 - Overview: Role of land-atmospheric...

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Overview: Role of land-atmospheric interaction in Climate, Phase-2 • IPCC AR4: – Land occupies 30% of global, but absorbs 2.6 out of 6.5 GtC yr -1 of CO 2 (relative to 2.2 GtCyr -1 by ocean) – land use release 1.6 GtCyr-1 CO 2 to atmosphere, ~ 1/4 to 1/3 of fossil fuel emission, – Land use, vegetation response to climate and soil degradation in addition change Earth’s surface albedo • WMO 2005 Report: – Land degradation directly affect 250 M people, and influence 1 B people
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Climate change signal has been stronger over land than over ocean: IPCC AR4
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Areas vulnerable to desertification (USDA):
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Impact of land stress in Africa:
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• Land-climate impacts cause 63% of $654B cost due to natural disasters during 1993- 2002. (Belgian Centre for Researhc o the Epidemiology of Disasters)
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Prioritize the topics: Vegetation-climate feedbacks and i ts role in determine global atmospheric CO 2 , • Impact of soil moisture/vegetation on droughts and flood, and water source • Climate impact of desertification • Climate surprise – impact of sudden change in vegetation regime on climate • Impact of forest-crop conversion on surface energy and water budget • Climate mitigation by planting forests – what other effect beside CO2 sequestration need to be account for.
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– Land-atmosphere in determining climate and surface water and energy balance in Arid (Sahara), semi-arid (Sahel) and humid climate (Amazon) in tropics, – Albedo-climate feedbacks in subtropical desert and high latitudes – Impact of forest-crop conversion on surface energy and water budget – Impact of biomass burning on climate – Impact of urbanization and irrigation on local climate – Other topics recommended by students.
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influence climate: Biosphere-climate-land use interaction – Impact on water cycle – Impact on global carbon cycle – Impact on surface albedo – Impact on methane and atmospheric composition Physical properties of land surface and climate: – Tectonic and climate – Mountain uplift, erosion and climate
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This note was uploaded on 11/07/2011 for the course EAS 8803 taught by Professor Staff during the Spring '08 term at Georgia Institute of Technology.

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Overview-phase2 - Overview: Role of land-atmospheric...

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