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Global Environmental Systems Exam 3 Study Guide The obliquity cycle (the Earth's tilt) fluctuates between what angles during its 41,000 year cycle?21.5 to 24.5 degrees.SunspotsMay be one of the causes for global climate changesHow many climate groups are in the Climate Classification System?FiveBased on the study of past climate, we can conclude that future, long term climates will beVariable.The 41,000 year cycle of the tilt of the Earth's axis is called theObliquity (tilt) cycle. What would be the greatest effect to climate from the movement of continents via plate tectonics?Changes to thermohaline circulation.The 1990s and 2000s were the coolest decades on record.FalseThe Medieval Warm Period Began before the Little Ice AgeWhat is the Milankovitch Cycle?-An explanation of long term climate changes on Earth, based on human activity.During the warm Middle Cretaceous Period, about how much higher was sea level versus today?-100200 meters.The release of ______ by volcanoes could lead to cooling, whereas the release of _____ by volcanoes could lead to warming. ash, carbon dioxideThe 100,000 year cycle of the extent of Earth's elliptical orbit around the Sun is called the -Eccentricity cycle.Earth has been relatively warm for about how many years?15,000 years
Assume you are a climatologist analyzing tree rings to determine past climates. If you see a period of time where the length between tree rings are larger than at other times, what does that tell you?-During periods of greater moisture and warmer conditions, tree rings will generally be wider.Which of the following climate proxies provide the longest time frame of data?Antarctic ice cores.The natural vegetation of tropical climatic environments is generallyTropical rainforest.The Climate Classification system combines measurements of average temperature, precipitation, and seasonal variation to define climate types. TrueThe two weather variables used most often as indicators of climate areTemperature and cloud cover. During periods of glaciation, ocean waters became more enriched with which isotope?Oxygen18Temperatures increased by about how many degrees from the Pleistocene Epoch to the Holocene Epoch?-6 degrees centigradeA climate type not found at sea level in the Southern Hemisphere isD.What is the difference between present and iceage snowlines along western North America?-About 9001000 meters along the southern part of the transect. Paleoclimatic evidence includes desert sand dunes now covered by vegetation and channel systems of nowdry streams-True Which of the following is an important greenhouse gas?-Carbon dioxideAssume you are a climatologist studying seafloor sediment. You have a 200,000 year old cross sediment in which you are going to analyze the ratio of oxygen18 to oxygen16. During your analysis, you determine that there is a greater quantity of oxygen18 than oxygen16 (beyond today's present values). What does this tell you?
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Join more than 18,000+ college students at Colorado State University who use StudySoup to get ahead
School: Colorado State University
Department: Natural Resources
Course: Global Environmental Systems (GT-SC2)
Professor: Ursula Buford
Term: Spring 2016
Name: GES study guide exam 3
Description: This study will review sections from week 5- 11 such as severe weather, air circulation, the ocean, cloud formation, climate change.