GEOG1300 - Introduction to the Biophysical Environment...

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Lecture 1 & 2 11/10/2015CHAPTER 11.Physical GeographyAbout landscape appreciation and understanding why landscapes look the way they do oAppreciating patterns of landscapes 2.What is geography?
3.What is physical geography?
4.Systems Theory Systems oSystem Any ordered, interrelated, set of things and their attributes, linked by flows of energy and matter, as distinct from the surrounding environment outside of the systemo“Any set of related events or objects and their interactions”Input Some sort of interaction Output Open/closed systems oOpen systemInputs of energy and matter flow in and out of the system E.g. A leaf Plant photosynthesis Plant respiration oClosed systemSystem is shut off from surrounding environment so that energy and matter are self-contained For a system to maintain a steady-state condition it must possess the capacity for self-regulation System feedbackoPositive feedback
Higher atmospheric and water temperatures Over ice-mass loss which increased melt-pond area Darker melt-pond area absorbs more Produces increased water and air RESULT Amplified response oNegative feedback Increased atmospheric CO2 levels Increased vegetation cover Increased carbon store in plant tissueDecreased atmospheric CO2 levels RESULT The response counters the initial variable System equilibrium oSteady state equilibriumA balance of energy and material over time, in which conditions are constant = a steady state condition Inputs and outputs are equal oDynamic equilibriumAn imbalance of energy and material over time, in which conditions vary Inputs and outputs are not equal oThe nature of equilibrium in a system is dependent on…Thresholds oTipping pointoSystem can no longer maintain equilibrium oLurches into a new operational level (metastable equilibrium) 5.The Earth, Movement, Geographic Location and Scale Rotation – Shape oCentrifugal force Same force operates from east to west Revolution oHow long, to the exact second, is one earth year?
Geographic location o2 main methods of determining locationLatitude Longitude oGuelphLatitude 43.5 degrees NLongitude 80.256.GIS – Mapping Examples of information oVegetationoClimate oFood sources oSeasonal/natural disasters oRainoPredators Mapping physical information CHAPTER 2Solar Energy to Earth and the Seasons7.The Sun in Space The sun as an “average-sized” starSource of energy = Nuclear fusionFacts oSpeed of light 299,792 km/soMilky way galaxy 100,000 ly across oOur solar system 11 light-hours across oMoon is 1.28 light seconds away 8.The Solar System The planets

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