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Transcript 06_Energy_IIx

Planetary Energy Budget
Current News and Weather
Solar Elevation at Noon
Terrestrial Radiation (Long-Wave Energy)
Greenhouse Effect
For Next Class: Read all of Ch. 4
2017 Peru Summer Study Abroad:
Climate Change, Glaciers, and Water Resources
June 29 to July 13, 2017
GHY 3140: Andean Mountain Geography (3 hrs)
GHY 3530: Climate and Tropical Glaciers (3 hrs)
This 15-day intensive program introduces students to climate change impacts in
the Andes through direct field experience and research activities, readings,
discussions, and meetings with guest speakers. Field excursions to Machu
Picchu and other locations in the Sacred Valley and a 6-day trek in the Cordillera
Vilcanota (with strenuous ascents to over 17,000 ft) will provide an outstanding
setting for the study of Andean human-environment interactions and the
impacts of climate variability and change on tropical glaciers, ecosystems, water
resources, and human populations.
Program Leader: Dr. Baker Perry
Interested? Contact Dr. Perry ([email protected]) to apply or for more information.
Do we get tested on what's on the textbook or what's on the PowerPoint?
The book kept talking about the equations to calculate the Earth's rotation, that was
really confusing, can we go over it in more detail?
Can you describe how to convert from "Celsius" to Fahrenheit again?
Why does the location of the sunset change throughout the year?
How long is the current day(s) in Boone?
Can you explain one more time (SEN) and how to calculate it?
Is SEN and Solar Altitude the same concept?
Does the solar elevation at noon vary depending on your location on earth?
What is the solar elevation at noon in Boone?
Why is it important to know the solstice and equinox?
So the amount of energy the earth absorbs is referenced to as its budget? Why?
What do the IPCC working groups do specifically?
In the beginning of Chapter 3, there are several equations provided. Do we need to know
these for the class? If so, can you go over them as the way the textbook explains them is
What do we need to know about the acronyms? IPCC, UNEP, and WMO?
Can you explain more about blackbodies?
What do we do about Donald Trump?
Solar Elevation at Noon
Figure 2.18
Solar Elevation at Noon (SEN)
SEN is the angle of the noon sun above the horizon
SEN = 90˚ - ArcDistance
ArcDistance = number of degrees of latitude between
location of interest and sun’s noontime vertical rays
If the latitude of location of interest and sun are in opposite
hemispheres, add to get ArcDistance
If they are in the same hemisphere, subtract from the larger
of the two values
SEN Example
What is the SEN on June 21
for Boone (36 N)
SEN = 90 – ArcDistance
Where are the sun’s noontime
vertical rays?
ArcDistance = 36 – 23.5
ArcDistance = 12.5
SEN = 90 – 12.5
SEN = 77.5˚
Group Exercise
What is the Greenhouse Effect and why is it
What are the dominant greenhouse gases?
Terrestrial Radiation
 Greenhouse
Heating of Earth’s surface and lower
atmosphere caused by strong absorption and
emission of infrared radiation (IR) by certain
atmospheric gases
• known as greenhouse gases
Similarity in radiational properties between
atmospheric gases and the glass or plastic
glazing of a greenhouse is the origin of the
term greenhouse effect
Terrestrial Radiation
Greenhouse Effect
Responsible for
considerable warming
of Earth’s surface and
lower atmosphere
Earth would be too
cold without it to
support most forms of
plant and animal life
Terrestrial Radiation
 Greenhouse
Water Vapor is the principal greenhouse gas
• Clear-sky contribution of 60%
Other contributing gases:
• carbon dioxide (26%)
• ozone (8%)
• methane plus nitrous oxide (6%)
Terrestrial Radiation
Greenhouse Gases
Atmospheric window: range of
wavelengths over which little or no
radiation is absorbed
• Visible atmospheric window extends
from about 0.3 to 0.7 micrometers
• Infrared atmospheric window from
about 8 to 13 micrometers