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Terms in this set (37)
-very long-term natural archive
-typically low temporal resolution
-remains of marine organisms
-long-term natural archive
-resolution can be quite good
-stable isotopes of oxygen
-volcanic eruption chronolgy and atmosphere aerosol concentrations
-Long-term natural archive
-Resolution can be quite good
-physical sediment characteristics
-ring width variation
-stable isotope analysis of wood
-Mineral cave deposits
-annual laminae of deposits
-stable isotope analysis
-Annual skeletal growth bands
-stable isotope analysis
Pack Rat Midden
-Material collected and preserved in dens of pack rats
-up to 40,000 years
-deposition of intermittent; careful dating required
-Remains of plants and animals
Ocean sediment cores
Provide the longest record of past climates (several millions of years) but their temporal resolution is not high
Provide moderately long records (up to 800,000 years) and their temporal resolution is quite high
The longest time period designation
What era do we currently live in?
1st major subdivision within and era
What period do we currently live in?
2nd level subdivision of an era
What epoch do we currently live in?
About how many years ago did the Holocene begin?
What was the previous epoch called?
Temperature over the past 70 million years is ______ from Ocean sediment cores
Temperature over the past 70 million years shows gradual _______ over the 15 million years
Temperature over the past 70 million years shows ______ variabiltiy beginning 3-4 million years ago
indicator of alternating glacial and interglacial periods
Characterized by large swings between warm and cold phases
large scale glaciation
cold phases correspond to
Most recent glacial phase peaked around ______ years ago
In North America, the most recent glacial phase was known as the
Following the last glacial maximum, rapid warming began about 15,000 years ago. What do we call this?
Warming was interrupted by a brief cold period known as the
A rapid temperature rise to a maximum
The Holocene is characterized by
Medieval Warm Period
In the past 1000 years, temperatures were warm in the early part of the previous millenium (c 1000-1100 AD). What was this period known as?
The little ice age
Temperatures were much cooler in 1450-1850. This was known as...
a rapid increase in temperature
In the past 150 years, climate has been characterized by:
22-year sunspot cycle
Most widely tested connection between climate and solar variation
Variable nature of earth's orbit around the sun was first proposed by Serbian scientist _________ in the 1920s but not generally accepted until the 1970s
Degree to which the orbit about the sun is different from circular
Inclination of the earth's orbit around the sun with respect to it's axis of rotation
Like a spinning top, the earth's axis of rotation revolves around its center
In terms of timing of the beginning and ending of glacial periods, the variations in obliquity and precession seem to be ____ influential than the variation in eccentricity