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EVIDENCE for variations in temperature in the past - Coggle Diagram
EVIDENCE for variations in temperature in the past
PROXY DATA
Paleoclimate proxies are physical, chemical and biological materials preserved within the geologic record (in paleoclimate archives) that can be analyzed and correlated with climate or environmental parameters in the modern world.
Three types of
proxies
video
example
Slideshow
ANCIENT PAST
Ice cores
ANSTO
activity
p164 Spotlight
videos
Fossils and microfossils
pollen
p.163 spotlight
foraminifera
glacial moraines
p.162 Spotlight
Oxygen isotopes
p.163 Spotlight
scientific
american
earth
observatory
SYLLABUS
RECENT PAST
ice ages
several ice ages over 1 million years
evidence for mini-ice age
activity
mega fauna
large animals that could survive ice ages
aboriginal rock art shows drawings of mega fauna
dendrochronology
study of tree rings
variations in thickness/colour of rings indicate tree growth and rainfall
oxygen isotopes
oceans
coral
foraminifera
limestone caves
ice cores
CO2, methane, dust, ash
antarctic record goes back 800000 years
direct instrumentation
reliable temperature records only from mid 1800's