BIO220H1 Lecture Notes - Lecture 11: Foraminifera, Clathrate Gun Hypothesis, Extinction Event
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BIO220H1 Full Course Notes
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Document Summary
Study of cyclic and seasonal natural phenomena: timing events. Integrates the effects of temperature into their effects on organisms. Ice-thaw in canadian lakes: most canadian lakes thaw earlier than they used to. Bud burst in european trees: budburst: emergence of new eaves or stems at the start of the growing season, budburst coming earlier between 1984-1999. Date of first flower in british wildflowers. Trophic cascade in caterpillars and their predators. Consistent with solar activity: poles warming faster than mid-latitudes; winter temperatures rising than summer. However, solar activity does not explain why nighttime temperatures rise faster than daytime and why troposphere is heating and stratosphere is cooling: troposphere: lowest layer, stratosphere: second layer. Greenhouse effects is consistent with all observations. Rebuilt global climate histories, database, etc. , from scratch i. e. , using raw data. Created simple models based on co2 concentration, volcanic eruptions. Tested and rejected the effects of variation in solar radiation.
