iss test 2 - Lesson 5 Our atmosphere and Global Climate...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Lesson 5 Our atmosphere and Global Climate Regions - Constant gases - maintain the same proportion on a constant basis. May have changed over long periods of time but are relatively the same over recent history. Nitrogen 78%, Oxygen 21%. - Variable gases –vary in proportion over time CO2 -plants absorb it and release oxygen for us to breathe. CO2 acts like a blanket over the Earth trapping heat transferred to the atmosphere by the Earth's surface. Fluctuations in carbon dioxide levels in the atmosphere are thought to be a primary component of major climate change. When carbon dioxide levels are low, more heat escapes into space and the Earth cools. When carbon dioxide levels are high, in contrast, more heat is trapped and the Earth warms. Water vapor - water vapor is vital because it absorbs heat from the Sun. As vapor is moved around the planet by the currents within the atmosphere, the effect is to moderate temperature making life possible. The amount of water vapor in the air at any specific location depends upon many variables, but perhaps the most important is temperature. Warm air can hold more water vapor than cold air. Ozone – found in smaller percentage than water vapor. Made of 3 oxygen atoms when a oxygen combines with oxygen molecule. Ozone layer is important it keeps 95 – 99% of UV radiation away from earth. The largest-ever observed ozone depletion hole was seen in September 2006, and measured 10.6 million square miles. Depletion of the ozone layer has been linked to chlorofluorocarbons Particulates - pollutants, dust, volcanic ash released during volcanic eruptions. These reflect solar radiation and help form raindrops. They can affect our visibility. Primary air pollutants are carbon dioxide and water vapor (greenhouse gases), hydrocarbons (acid rain), carbon monoxide (poisonous to humans) , nitrogen oxide (ground level ozone and acid rain formation), sulfur oxides ( form acid rain). These are considered status symbol pollutants because in industrial areas. Major primary solid pollutants – iron, lead , copper, manganese, titanium, nickel, suspended wood - Impurities Layers of the atmosphere- atmosphere extends to 1000km = 600 mi above sea level Troposphere – lowest to earth, zone of the biosphere and active weather, containing almost all of the water vapor in the atmosphere. Earth's surface to between 8 and 18 km (~ 5 to 11 mi.) above sea level. It is warmed by longwave radiation that is emitted from Earth. The elevation of the upper limit of the troposphere, the tropopause, depends upon surface temperatures and pressures and so varies with season and latitude. The troposphere is thicker at the equator than at the poles and also thicker in summer than winter. Temperature decreases as altitude increases in the troposphere. Change in temp = lapse rate . As
Image of page 1

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

View Full Document Right Arrow Icon
elevation increases in the atmosphere, the temperature drops 3.5° F per 1000 feet (positive lapse rate). At the tropopause, the temperature stops decreasing and begins to increase.
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern