GC 170a1 1st Edition Lecture 16 Outline of Last Lecture I. Natural Climate Variability II. Proxy methodsOutline of Current Lecture II. Paired ActivityCurrent LectureI. Paired Activitya. Collect environmental data for five Bristlecone Pine Sitesi. Three in California: Sheep Mt (SHP), Campito Mt (CAM), Methuselah Walk(MWK) ii. Two in Colorado: Almagre Mt (ALM), Hermit Lake (HER)b. What will be learnt: i. Site selection 1. A group of trees that are sampled at a location 2. Sites are usually named after geographic location ii. Moisture-sensitive vs. temperature-sensitive sites 1. Temperature-sensitive: At higher elevations, growth is limited by cold temperaturea. Warm summers (longer growing season) = wide rings b. Cold summers (shorter growing season) = narrow rings2. Moisture-sensitive: At lower elevations, trees are limited by precipitationa. Wet winters (more rain/snow) = wide rings b. Dry winters (less rain/snow) = narrow ringsiii. Skeleton plot master 1. A graphic representing the narrow rings in a tree-ring sample.2. Skeleton plots are used for crossdating3. Lines represent narrow ringsiv. Ring width index 1. A time-series plot showing trends in ring width (tree growth) over the past 250 years.v. Frost Rings1. A frost ring is a row of damaged cells in the middle of a tree ringThese 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.2. Very cold temperatures cause the cell damage in the trees a. Likely to happen for temperature-sensitive trees growing at high
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