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CORNELL BIOEE 1610 - Climate Change

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BIOEE 1610 1st Edition Lecture 3Outline of previous lectureI. EnergyII. PhotosynthesisA) Light reactionB) Dark reactionIII. Resources for photosynthesisA) Lighta. Phytoplanktonb. Land plantsc. C-4d. CAMB) Carbon dioxideIV. Animal resourcesOutline of current lectureI. Climate changeII. CirculationA) AtmosphericB) OceansIII. ClimateCurrent lectureI. Climate change*The rate of global warming is 20-fold faster than it has EVER been*If current emissions of greenhouse gasses continue, we will hit serious problems sometime between 2030 and 2040*Models of global response to climate change-Gradual-FragileThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.-Stable-Threshold-Random*Differential heating, equator vs poleII. CirculationA) Atmospheric*Hadley cell(equator-30 degrees)*Ferrell cells(driven by polar and Hadley cells)*Polar cell(60- 90 degrees)*Adiabatic cooling(as air expands, it cools and loses moisture*Prevailing winds (Coriolis effect)B) Oceans*40% of heat from tropics to temperate and polar regions*Great conveyor belt*Water sinks in Atlantic: denser than other surface water because it’s cold and salty*Global impact:-Helps take C02 out of the atmosphere*Why is the great conveyor belt slowing down? The “pump” (the north Atlantic where the dense water sinks) is being affected: as the world warms and the freshwater ice caps melt, the northern waters become less denseand cannot power the great conveyor belt as effectively. Also, there is increased precipitation in Siberia leading to increased river flow into the Arctic OceanIII. Climate*Topography-Rain shadow(more precipitation on ocean-side of mountains, less on land-side)-Elevation (the higher you are, the lower the pressure, the colder it is)*Seasonal variation (different sun angle throughout the year)*Tropical rainy seasons vary spatially due to seasonal variation in “equatorial” low*Annual seasonal temperature variation (max-min temps)*Deforestation leads to increase albedo and sensible heat loss, but less latent heat loss (evapotranspiration)*Variation in weather patterns from year to year*Currently: record floods and droughts… evidence that change in atmospheric factors may mean more variable weather*Jet stream is becoming “wavier” (is this how the Ferrell cells respond to global warming?)*The jet stream was altered during Hurricane Sandy, pushed it onto


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