Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download 28. 24 April
Document related concepts
Global warming hiatus wikipedia , lookup
Effects of global warming on human health wikipedia , lookup
Politics of global warming wikipedia , lookup
Climate change and agriculture wikipedia , lookup
Global warming wikipedia , lookup
Climate change in Tuvalu wikipedia , lookup
Climate change in the Arctic wikipedia , lookup
Climate governance wikipedia , lookup
Media coverage of global warming wikipedia , lookup
Citizens' Climate Lobby wikipedia , lookup
Scientific opinion on climate change wikipedia , lookup
Attribution of recent climate change wikipedia , lookup
Solar radiation management wikipedia , lookup
Public opinion on global warming wikipedia , lookup
General circulation model wikipedia , lookup
Instrumental temperature record wikipedia , lookup
Effects of global warming on humans wikipedia , lookup
Climate change, industry and society wikipedia , lookup
Effects of global warming on oceans wikipedia , lookup
Effects of global warming wikipedia , lookup
Surveys of scientists' views on climate change wikipedia , lookup
Global Energy and Water Cycle Experiment wikipedia , lookup
Climate change and poverty wikipedia , lookup
Climate change feedback wikipedia , lookup
Physical impacts of climate change wikipedia , lookup
Transcript
24 April 2014 – Geog 3601 Lecture Summary 1. Paleoclimatology Datasets Continued our discussion of this web site: www.ncdc.noaa.gov/data-access/paleoclimatology-data/datasets and the handouts Tables 1.1 and 1.2. My expectation is that you become educated on any two datasets. Specifically: - Summary of the method - Advantages and Disadvantages - Appropriate time scales 2. Stable Isotopes - Used for long-term climate trends e.g. 100,000 – 400,000 years ice - Isotope Definition: Any element, # of protons (atomic number) is invariant, but # of neutrons may vary, resulting in different isotopes of the same element Example: Carbon – always 6 protons, but may have 6,7, or 8 neutrons. Atomic Mass = total number of protons and neutrons: C C C P 6 6 6 + + + N 6 = 12C 7 = 13C 8 = 14C O O 8 8 + + 8 = 16O 10 = 18O light heavy light heavy Warm World: Ocean sediment: Ice Core: enrichment of 18O relative to 16O enrichment of 16O relative to 18O Cool World: Ocean sediment: Ice Core: enrichment of 16O relative to 18O enrichment of 18O relative to 16O Such measurements have revealed that climate change can be rapid (decades) and global (pole-to-pole). E.g. Figure 11-8 on handout – positive feebacks were discussed. What are examples of mechanisms that could create such rapid and largescale climate change? - Large volcanic eruptions Magnetic field changes Large asteroid impacts Ocean circulation changes 3. Began our discussion of Milankotich Theory - See figure 11-9 (handout) and this website: www.sciencecourseware.org/eec/GlobalWarming/Tutorials/Milankovitch - We discussed the significance of 65 deg N latitude in June We discussed: Eccentricity; Obliquity; and Precession
