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ESS102H1 (104)
Lisa Tutty (11)

lecture 1

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Earth Sciences
Lisa Tutty

Lecture 1Global environmental change is both natural and human induced of physical chemical and biological interactions vary both spatially and over a wide range of time Introductionkey concepts Humans are increasingly aware that their environment is changingWhat we need to assess the extent of current global change o Right toolAn understanding of how global processes and earth systems work o ContextUnderstanding how much the globe has already changed recently and in the geologic pastComplex web of physicalchemicalbiological interaction in the atmosphere the biosphere the hydrosphere and the lithosphereRate is importantincludes gradual processes over geologic time as well as rapid andor catastrophic eventsContextglobal environmental change is not a recent phenomenon Change is the norm Humans have only recently become significant agents of global change The Earths SystemsA system is any assemblage or combination of interacting components for example the human bodyThe Earth System has 4 major interacting parts with flows of matter and energy between them o Biosphere hydrosphere atmosphere lithosphereAll interact with each other Lithosphere o The solid earth The upper part of the solid earth which interacts with the other components of the earth systemAtmosphereo A mixture of gasesHydrosphere o Totality of earths water both liquid and frozen o 97 of liquid water is oceansBiosphere o The living and dead organic components o All alive and decayed life o Macro and microEcosphere o Includes the biosphere plus its interactions with the physical systemsIn the earth system science the findings of physical and biological sciences are integrated into a global view of our planetThis approach considers the complex interconnecting web of physical chemical and biological processes and the modifications of these processes and of the earths systems components through time2 key sources of energy fuel the dynamic earth system o External energy from solar radiation which drives the hydrologic cycle and the circulation of atmosphere and oceans these in turn cause erosion of the land surface o Internal energy which drives volcanism and lithosperic deformation plate tectonicsFrom radioactive decay in the earths interiorExample of interaction between the earth system components
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