Chapter03a - Seasons Mid-chapter review ;however,itemits ,...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Seasons
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Mid-chapter review The Earth absorbs solar radiation only during the daylight hours; however, it emits  infrared radiation continuously, both during the day and at night. The Earth’s surface behaves (almost) as a blackbody, making it a much better absorber and  emitter of radiation than the atmosphere. Water vapor and carbon dioxide are important atmospheric greenhouse gases that  selectively absorb and emit infrared radiation, thereby keeping the Earth’s average surface  temperature warmer than it otherwise would be. Cloudy, calm nights are often warmer than clear, calm nights because clouds strongly emit  infrared radiation back to the Earth’s surface. It is  not  the greenhouse effect itself that is of concern, but the  enhancement  of it due to  increasing levels of greenhouse gases. As greenhouse gases continue to increase in concentration, the average surface air  temperature is projected to rise substantially by the end of this century.
Background image of page 2
RECAP The Sun is the ultimate energy source for our atmosphere The peak of the solar emission is in the  visible  wavelengths As the solar light travels through the atmosphere it is Reflected  (albedo) by clouds and particles Absorbed  by air molecules and clouds Scattered  by molecules and particles Transmitted   to the surface of the Earth  The latter two portions heat the Earth’s surface, which, in turn, warms  the air above
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 21

Chapter03a - Seasons Mid-chapter review ;however,itemits ,...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online