BIO 141 1st Edition Lecture 10 Outline of Last Lecture II. Law of ThermodynamicsIII. PhotosynthesisIV. RespirationV. Plant cellsVI. Mitochondria VII. Carbon cycleOutline of Current Lecture VIII. Climate ChangeIX. AtmosphereX. Planet TemperatureXI. GlaciersXII. AlbedoCurrent LecturePlants, People, and Climate Change- Multiple kinds of evidence for human-causes- CO2 and Methane are major GHG- Major sources are burning fossils and altering vegetation, especially deforestation - Anthropocene = human eraAtmosphere and climate have changed- Earth may be about 4,600,000,000 years old- Earth’s early atmosphere mainly H and He- Replaced by volcanic gassesClean dry air- 78% Nitrogen- 25% Oxygen- 1% ArgonPlanet TemperatureThese 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.- Energy in = energy out- The earth gets cooler or hotter- Earth’s energy balance has not always been balanced - Without greenhouse gasses we would be frozen solidRecent Change: Phenological Evidence- What makes nature’s clock tick?- Phenology: the study of seasons, cyclic, seasonal natural phenomena, especially in relation to climate and living things- Aldo and Estella Leopold Family kept track of seasonal changes- Long-distance migrants showed little change- Long-distance rely on day-length- Short-distance migrants rely on temperature and arrive earlierGlaciers and Ice Fields- Glacier researcher Mauri PeltoGlacial retreat is documented in- Every continent except Australia. There are not glaciers there.Post-Glacial Rebound- Jargon: isotatic adjustment- Lake Superior regions is still rising- New, more rapid rebounds are being documented Age of Arctic Ice- Huge areas of ice breaking of- West Antarctic ice- Size of Rhode Island (1214 square miles)Albedo- Reflected light vs. incoming light- Reflectivity of the earth- Snow reflects up to 85% of the solar radiation- As glaciers and ice fields retreat, less radiation is reflected and more is absorbed, heatingthe earth- Thus, a positive feedback loop to accelerate warming- Example, how dark clothing gets warmer in the sun faster than light
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