Exam (elaborations)
EAS 201 - Climate (1)
EAS 201 - Climate (1)
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EAS 201 - Climateforcing - CORRECT ANSWER-an imbalance between the absorption of solar
radiation and energy emitted by the top of the earth's atmosphere
THE CAUSE
Feedback - CORRECT ANSWER-the reaction of the climate system to the forcing
-it can be positive (reinforce the change)
-or negative (counters the change)
THE EFFECT
weather - CORRECT ANSWER-the state of the atmosphere at any given place and
time
climate - CORRECT ANSWER-the average state of the weather on time scales of
seasons and longer
positive and negative feedback example - CORRECT ANSWER-positive:
there is an increase of C02 from volcanism or c02 emissions (fossil fuels) and this
causes more evaporation of the oceans which creates water vapor. Water vapor is a
very efficient greenhouse gas and absorbs solar radiation alongside the carbon
which makes the planet very warm
Negative:
because there's a lot of water vapor, it makes more clouds. These clouds cover the
sun and therefore blocks the solar radiation
climate proxies - CORRECT ANSWER-is a source of information from natural
human records that can be used to estimate past climate conditions
-we can infer information about past climates and environments
natural proxies - CORRECT ANSWER-pollen, tree rings, ocean and continental
coastal sediments
Varves - CORRECT ANSWER-lake sediments have distinctive laminated beds
called varves.
these contain several proxies - e.g. diatoms are single-celled organisms and when
we look for their abundance or indicator species with can estimate the climate
ice cores - CORRECT ANSWER-most important
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