Physical Geography

Physical Geography - PhysicalGeography 17:27...

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Physical Geography 17:27 Intro to Weather and Climate Weather- short term view of atmospheric conditions for a given place at a  given time (a day of a few days) Climate- longer term view of weather Atmosphere Envelope of gases that surrounds the earth and is held in place by gravity Troposphere- 5-10mi high o Its where weather happens Function- Protects us from harmful rays Composition of Atmosphere o 78% Nitrogen o 20% Oxygen o Rest mostly Trace gases What does CO2 do in the atmosphere? Greenhouse Effect- traps heat, are like windshields on a car It’s good to have CO2 because, it is necessary for plants, photosynthesis, and  is like a heat blanket Without CO2 average earth temperature would drop from 55 to -37 o CO2 keeps earth warm o CO2 concentration are increasing dramatically o Sampled at Manua Loa 11,000 feet far from large populations Long Term history of CO2
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Bubbles in Ice cores from up to 3600m deep, Antarctic preserve samples of  past atmospheric composition CO2 is defiantly rising and is higher then its been in the past 400,000 years Biggest Contributor to rising Co2 Fossil Fuels and deforestation Top CO2 Emitters* China USA European Union Russian Federation India CO2 emissions change from land use change Rainforest areas more CO2 emissions Are there natural (non-human) sources of gases and particulates? Volcanoes Forest Fires  Plants Decaying Plants Soil Ocean CO2 can also cause cooling But heating factors seem to be winning
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The vast majority of scientists believe that CO2 is causing climatic warming. If the warming affect continues what are going to be some of the effects on the  landscapes? Sea level increase 10-25cm last 100 yrs What region of earth is most vulnerable to rising sea levels? Southeast asia Why do sea levels rise? Glaciers melt o Strong evidence of declining glacier Possible benefits of global warming Greater yields, longer growing seasons, increase rainfall Possible drawbacks More frequent droughts, heat stress, shortened life cycles, increased flooding,  and salinization Biggest Losers Under 3 different GCM (Global Climate Model) Developed Countries GCM shows cereal production goes up Developing Countries GCM shows cereal production goes down. Climatic Warming would cause an increase in disease, especially in mid and  higher latitude areas.
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Lecture 2 17:27 Atmospheric Pressures The force exerted by the weight of air Sea Level- Higher air pressure On mountain- lower air pressure Altitude goes up, Atmospheric Pressure goes down Kittinger Balloon- set 2 records that still hold, went up to 102,000 feet. 
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Physical Geography - PhysicalGeography 17:27...

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