2 OceanographyThe study of the physical characteristics, chemical composition and life forms of the oceanMatthew F. Maury - began early study in 1850’s using records from navy ships
3 Why Study Oceanography To Feed Us - AquacultureTo predict weatherMineral Resources
4 Global OceanCovers 3/4 of the earth’s surface (this is the most prominent feature on Earth!)contains 97% of all the water on the earthTotals 1/800 of Earth’s total volume5 oceans: Pacific, Atlantic, Indian, Arctic and Southern (Antarctic)smaller areas of the oceans are called seas
17 SONAR Sound Navigation and Ranging consists of a transmitter and receiversound waves are used to map and make profiles of the ocean floor
18 Speed = Distance Time Distance = Speed x time Time = Distance Speed * Transmitter sends out sound 1500 m/s* Sound waves are reflected back to receiver* The time elapsed gives depth or distance:Speed = DistanceTimeDistance = Speed x timeTime = DistanceSpeed
19 …it would take 125 years to totally map the ocean floor using sonar…
20 …these days we can use satellite altimetry! The bumps & dips on the ocean’s surface mimic the topography of the ocean floor.SEASAT (and later GEOSAT) circle the earth; their sensitive radar altimeters send data used to create ocean floor maps.