Test 3

Test 3 - Oceanography Study Guide: Test 3 Air Sea...

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

View Full Document Right Arrow Icon
Oceanography Study Guide: Test 3 Air Sea Interactions: Greenhouse gases: CO 2 , N 2 O, CH 4 , CFC Atmosphere is the volume of gases, water vapor, and airborne particles enveloping Earth. Earth’s atmosphere and ocean are intertwined. Weather is the state of the atmosphere at a specific time and place Climate is the long-term average of weather in an area Heat input to Earth: air becomes cooler when it expands and warmer when compressed. Air descending from high altitude warms as it is compressed by the higher atmospheric pressure near Earth’s surface. Diagram: 23.5 º tilt of the Earth How much light penetrates the ocean depends on several factors: the angle at which it approaches, the sea state (how much turbulence?), and the presence of ice. - near the poles light filters through more atmosphere, and approaches at a low angle, so a lot of light is reflected. The opposite is true of tropical areas. - water temperatures are regulated largely by air circulation. As water evaporates and condenses to form rain, it moves between the poles and the tropics to regulate temperatures. Convection currents are caused by the difference in air density resulting from the temperature difference between different areas. (Think of warm air rising in a room as cold air falls). Air circulation on Earth is governed by uneven solar heating and Earth’s rotation. - Earth’s eastward rotation deflects air and water (or any moving body). This deflection is called the Coriolis Effect = sine latitude. As you go further north, the Coriolis Effect gets stronger. In the Northern Hemisphere objects appear to move to the right and in the Southern Hemisphere this movement appears to be towards the left. Both objects are moving east. Atmospheric circulation cells are large circuits of moving air. There are six. Diagram: Polar cell Ferrel cell Hadley Cell Doldrums Hadley Cell Ferrel Cell Polar Cell - The West Wind Belt is an air current that creates the world’s strongest oceanic current. The ocean current continually flows eastward around the South Pole.
Background image of page 1

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

View Full DocumentRight Arrow Icon
Air at the boundaries between circulation cells (at 30º or at the equator) moves vertically, but within a cell air moves horizontally. The calm air at the boundaries are called doldrums or intertropical convergence zone (ITCZ) . This area is known as the meteorological equator as opposed to the geographical equator because it typically varies about 5º to the North. This is because there is proportionally more land in the Northern hemisphere. The trade winds move within Hadley cells and the westerlies move within Ferrel cells. Monsoons are patterns of wind circulation that change with the seasons. The seasonal changes of the ITCZ affect weather greatly in areas like India and Bangladesh. Hurricanes:
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/22/2011 for the course OCS 1005 taught by Professor Condrey during the Spring '08 term at LSU.

Page1 / 6

Test 3 - Oceanography Study Guide: Test 3 Air Sea...

This preview shows document pages 1 - 3. Sign up to view the full document.

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