Unit 8 Climatic Interactions Define it 1. Air Mass 2. Air Pressure 3. Anemometer 4. Atmosphere 5. Convection Current 6. Coriolis Effect 7. Deep Ocean Current 8. Humidity a body of air that has about the same temperature and humidity throughout a measure of the weight of the atmosphere on a given area of the surface of the Earth; barometric pressure an instrument used to measure wind speed an envelope of mixed gases are held to the Earth by gravity; the most dense gases are near the surface of the Earth when temperature differences cause fluids to expand and move; the less dense (heat) areas continually rise, and the more dense (cold) areas continually sink creating a cyclical current the effect of the Earth’s rotation on the path of air and water; causes the path to curve currents flowing far beneath the surface of the ocean; driven by density differences amount of water vapor present in the air; relative humidity 9. Jet Stream narrow band of high speed wind high in the atmosphere; moves west to east in the Northern Hemisphere 10.Prevailing Winds global wind located at mid latitude; mostly blows in one direction Draw it/Remember it 11.Weather Front 12.Psychrometer 13.El Nino 14.La Nina 15.Gyre an area where two air masses with different temperatures and pressures meet instrument used to measure humidity (moisture) in the air period during which surface waters in the Pacific are unusually warm; impacts temperature and rainfall in the U.S. periods during which surface waters in the Pacific are unusually cool; impacts temperature and rainfall in the U.S. A large circular system of ocean currents