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Terms in this set (43)
paleo is the greek root for ?
paleoclimates are climates that
existed before humans began collecting instrumental measurements of weather
temperatures have risen 1.5 degree F since 1895
warming more rapid at night and in winter
what are the natural factors of climate change?
Position of the continents, milankovitch cycles, volcanic eruptions, variations in solar outputs and enso events
The shape of the orbit around the sun
changes from a circular to elliptical orbit, which takes 100,000 years
the tilt slowly changes from
21.8 to 24.4 from the vertical over 400,000
With less tilt seasonal differences
pole/tropic differences does what with tilt
the earth's wobble can cause a greater
this can cause summer
in the winter
lots of active volcanoes do what
add co2 to the atmosphere enhancing the ghe and leading to an ice free period
Slow removal of co2 may help what
cause ice ages
With major eruptions, the temps
Which of the following is not an example of instrumental measurements of weather?
the mathematical relationship between proxy data and the climate record is used to create a
this type of proxy data can indicate a change from a grassy environment to an environment rich in sage
corals allow climatologists to reconstruct the temps by measuring what characteristic of the coral?
isotopes of oxygen and trace metals
what does dendro mean?
rings that are from late spring/summer
are wide and light colored, thick and lots of growth
what happens to climate when co2 levels are lower?
less ghg, ice grows creating an ice age
what happens to climate when their is more water vapor in the atmosphere?
warmer climate, causes sea ice to melt
what happens to climate when sea ice melts?
sea levels rise, and temps would be warmer
how does the milankovich cycle affect climate when it is more circular?
there is no pressure changes, seasons are gradual
how does the milankovich cycle affect climate when it is further away from the sun
further away has less direct sunlight which can make it cooler
What information is created within ice cores?
You can see air particles that contain ancient air, the information changed past climates.
What is a problem that researchers run into when using ice core data?
They can't drill back in time to far
what is the ANDRILL team doing differently to study the paleoclimate of Antarctica?
They are trying to drill all the way through the ice to get sediment below
What are three things do geologists look at from the ocean floor sediments to tell the climate's story?
textures, colors, and contents
What do the fossils tell us about the climate of Antarctica?
They tell us about the climate of the water years ago before Antarctica froze
Based on diatom data, was the change to warm to cold climate extreme or sudden?
sudden, extreme conditions
What key piece of info is locked inside the shell of a foram?
They have the temps of ocean climates millions of years ago, they determine the temp of the time the foram lived
How does the ocean temps during the Pliocene compare to the present?
They are warmer
Based on changes seen in the sediment, describe how the ice sheet was behaving during the plociene?
There were changes in the environment, no ice/ice, and their were brief changes of cooling
What does slight changes in the temps tell us?
it can raise sea levels, can create it cooler
El nino does what to south America?
wetter along the pacific coast
El nino does what to North America?
colder, wetter winters in the southwest and milder in the Midwest and canada
El nino does what to Australia?
el nino does what to Africa?
wetter in the east and drier in the center and south
el nino does what to asia?
Drier in southeast asia
La nina does what to south America?
la nina does what to Australia?
wetter in the north and southeast
El nino causes what in south America?
El nino causes what in Australia?
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