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Oceanography Week 2 Notes

by: Rachel Rozow

Oceanography Week 2 Notes EAPS 10400 - 001

Marketplace > Purdue University > Science > EAPS 10400 - 001 > Oceanography Week 2 Notes
Rachel Rozow

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About this Document

These are the notes from the second week of lectures.
Greg M Michalski
Class Notes
25 ?




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This 2 page Class Notes was uploaded by Rachel Rozow on Friday September 2, 2016. The Class Notes belongs to EAPS 10400 - 001 at Purdue University taught by Greg M Michalski in Fall 2016. Since its upload, it has received 2 views. For similar materials see Oceanography in Science at Purdue University.


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Date Created: 09/02/16
Oceanography  As the temperature of the earth increases, the amount of heat in the deep is also  increasing, though not as quickly as the middle and surface ocean. Because of this, the  difference between the maximum and minimum temperatures of the ocean is increasing. The average temperature of the ocean, should it be suddenly mixed, would be  about five degrees Celsius. (just to give an idea of just how cold the bottom of the ocean  is. Temperature is described as the movement of molecules, so when heat is added to a system, temperature is not necessarily increasing. ­Knowing the names of the seas, gulfs, and bays allows an understanding of the  separation of areas, claims made on water, and the issues that take place in said areas. Bathymetry: study of the depth of the ocean and the practice of measuring it ­steam engines and piano wire were advances in the study because they  both simplified the method ­the original method involved throwing a weighted rope and measuring  how far it would reel out before stopping ­echo sounding was adapted after the sinking of the Titanic in order to  protect ships ­multi­beam systems were adapted to plot a better plane ­satellite altimetry: sea surface e is distorted by increased gravity of  underwater mountains, therefore the surface of the water takes the shape of the floor and  can be measured   Features of the ocean floor that make up the topography: ridges, trenches, abyssal  plane, plate tectonics Plate tectonic: 1950’s 1960’s, provided a mechanism that explained the  observations of sea floor topography Passive margins face the edges of diverging plate tectonics Active margins face the edges of converging plate tectonics Sea Level Rise New Orleans is sinking about two inches every year, further putting the city  below sea level Local sea level rise­ change inn average sea level relative to a point on local land  surface, meaning the altitude of the land mass is as much of a variable as the actual sea  level ­measured by tidal gauges Variables include ­local land sinking ­local land rising ­change in actual sea level Parts of northern continents are rising back up after being pushed down by ice age ice sheets. This is called “post glacial rebound” Remember, the changes in the actual sea leve can be caused by ­change in basin ­thermal expansion ­added water Change in basin: what causes a change in topography? Rising sea mounts, erosion from land ­though the process takes millions of years Thermal expansion: as water warms, it expands Density = mass/volume (grams/cm^3) specific volume = volume/mass =1/density As the seawater is heated, the mass still remains the same, it is just the volume  that changes 97% of all water is in the ocean and salty af


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