Transcript Is climate changing?

Is the climate changing?
Sept. 06, 2016
What is climate change?
• It is any systematic change in the long term
statistics of climate elements (such as
temperature, pressure, rainfall, or wind)
sustained over several decades or longer.
• In other words, we can compare the climate
for one period against the climate for another
period, and if the statistics have changed, then
we can say that the climate has changed.
Giving me 5 signs/evidences of
climate change
• Please have 10 students/group
• Writing firstly Names & ID numbers of all
group members on the upper right
corner of your answer sheet
• Taking a picture of your group work (for a
later study for coming exams) and then
Giving me your answer sheet
Thermometer
Satellite
Glaciers are thick masses of ice on land. The ice
has built up from many seasons of snowfall.
Glaciers move downhill very slowly.
Sea ice forms when water in the oceans is cooled to
temperatures below freezing. Most sea ice forms in the
Arctic and Antarctic Oceans.
Ice shelves are platforms of ice that form where ice sheets and
glaciers move out into the oceans. Ice shelves exist mostly in
Antarctica and Greenland, as well as in the Arctic near Canada
and Alaska. Icebergs are chunks of ice that break off glaciers
and ice shelves and drift in the oceans.
Ice Sheet
Temperature anomaly
• Is the difference between the actual
temperature and a reference temperature,
usually an average over a previous multidecade period.
• The positive anomaly means that the actual
temperature is warmer than the average over
a previous multi-decade period.
• The negative anomaly mean the actual
temperature is cooler.
Calculate monthly surface temperature
anomaly in December 2009
• The reference temperature for the anomaly
calculation is calculated at each station as the
average of the December temperatures from 2000
to 2009 at that location.
• For example: the reference temp. is 25.5 °C (average
data 2000-2009).
• The actual temperature of Dec. 2009 is 26.5 °C,
meaning that the temp. anomaly of Dec. 2009 is 1.0
°C warmer than the Dec. 2000-2009 average at that
location.
What is the evidence for climate change?
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Average earth’s surface temperatures
Glaciers
Sea ice
Ice sheets
Ocean temperatures
Sea level
Average
Earth’s
Surface
Temperature
GLACIERS
North Atlantic
Alps extend in an arc from France in the south
and west to Slovenia in the east, and from Monaco
in the south to Germany in the north.
Sea Ice
Ice sheets
Greenland
Ocean temperatures
The water
temperature
averaged over
a significant
fraction of the
ocean’s
average depth
of 4 km.
(not the
surface
temperature
of the ocean)
Sea level
How to get theses ppt slides?
1. 검색 창에 동아대학교 환경공학과
검색하여 학과 홈페이지 선택.
2. 학과 홈페이지에서
게시판  자료실
선택.
3. 제목 :
환경과 산업 수업자료입니다. (2개)
작성자 : 이현석