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![Page 1: This in an introduction to oceanography for 1st year students. In geochemistry, geology and misuse of the sea Resources are: Oceanography: An Illustrated.](https://reader036.fdocuments.us/reader036/viewer/2022062408/56649e245503460f94b13569/html5/thumbnails/1.jpg)
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This in an introduction to oceanography for 1st year students. In geochemistry, geology and misuse of the sea
Resources are:Oceanography: An Illustrated Text C. P. Summerhayes, S. A. Thorpe John Wiley & Sons, May 1996 ISBN: 0470345373 or 0470235748 352 pages
NASA visible Earth: http://visibleearth.nasa.gov/
Essentials of Oceanography (7th Edition) (Paperback)by Harold V. Thurman, Alan P. TrujilloA very good webpage can be found under:http://wps.prenhall.com/esm_thurman_essofocean_7/0,7261,382992-,00.html
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Composition of seawaterProcesses controlling seawater compositionMajor drainage systems of riversExplain Rock weathering, vulcanic ashes, aerosols, hydrothermalismFormation of sedimentary rocksHow does the salt get into the seaDominant ocean sediment types and locationsThe biological pump (photosynthesis, settling etc)The physical/solubility pumpVertical profiles of chemical elementsAtlantic versus Pacific comparisonExplain the two box modelOxygen in surface watersThe Marine Carbonate System
CO2 determination from ancient atmospheresCO2 in surface waterscurrent atmospheric CO2 concentration effect on global warmingCO2 saturation in seawater (name the different ions) ∑CO2 concentrations in oceans Lysocline and Carbonate compensation depth Ocean CO2 disposal option
Ocean resourcesEEZoverfishing/clima effectsOil/gas, Sand dredge, Manganese, Medicine, Biotechnology
SedimentologyLandformsBeach characteristicsLongshore current/driftErosional coastsDepositional coastsBarrier islandsCoastal protection
What you should know for the Oceanography exam
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The Ocean: A Global Geochemical System
Figure 1
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Deployment of a CTD cast. This instrument is routinely used during oceanographic expeditions for in situ measurements of water temperature and salinity. CTD casts can also collect water samples from different depths, stored in the dark grey cylinders visible on the photograph, which can then be used for further chemical analyses on board.
: www.pcweb.liv.ac.uk/ocean/ oceanography/f1f7.htm
Figure 2
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Composition of seawaterSeawater is a solution of salts of nearly constant composition, dissolved in variable amounts of water. There are >70 elements dissolved in seawater but only 6 make up >99% of all the dissolved salts; all occur as ions - electrically charged atoms or groups of atoms: their concentrations are mostly conservative and only affected by physical processes
Oceanographers use salinity -- the amount (in grams) of total dissolved salts present in 1 kilogram of water -- to express the salt content of seawater. Normal seawater has a salinity of 35 grams/kilogram (or litre) of water -- also expressed as 35‰. Seawater from Wormly in southern England is used as the international standard for seawater composition.As well as major elements, there are many trace elements in seawater - e.g., manganese (Mn), lead (Pb), gold (Au), iron (Fe), iodine (I). Most occur in parts per million (ppm) or parts per billion (ppb) concentrations. These minor constituets are mostly non-conservative and actively participate in chemical and biological processes that change their concentrations They are important to some biochemical reactions - both from positive and negative (toxicity) viewpoints.
Figure 3
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SeawaterRiver water
Figure 18
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Figure 6
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precipitation
Figure 7
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Processes controlling seawater compositionSalts dissolved in seawater come from three main sources:• volcanic eruptions• chemical reactions between seawater and hot, newly formed volcanic rocks of spreading zones (mid-oceanic ridges)• chemical weathering of rocks on the continents
Figure 8
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FIGURE 4-3
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FIGURE 4-4
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Primary source for weathered material is crustal rock
Limestone, sandstone and Shales are themselves sedimentaryproducts
Many salts in seawater originate from weathering of rocks on land. As rocks are weathered to form soils, they release soluble constituents like silica and elements like sodium, calcium, potassium and magnesium. River waters also carry bicarbonate (HCO3) - a by-product of weathering of silicate rocks or dissolution of limestone. Once they enter the oceans the dissolved salts remain, while the water continues to move through the hydrological cycle.
Figure 10
Figure 2
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FIGURE 4-5
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FIGURE 4-7
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Vulcanic ashesVolatiles hydrochlord acid sulphur containimg gases carbon dioxide
Volcanic eruptions produce large volumes of gases that eventually reach the oceans -- most important are sulphate and chloride. Submarine eruptions at spreading ridges inject gases directly into the oceans; gases from subaerial volcanoes are dissolved in rainfall.
Figure 13
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FIGURE 4-6
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AerosolsAerosols
Aerosols are powders, or droplets, suspended in a gas, with a typical particle diameter of about one micrometer. they can act as a nucleus for the condensation of water to make a relatively large cloud droplet. Once formed, aerosol particles can collide and stick together, or they can grow by further condensation from the vapour phase.
Aerosols
October 13, 2001 Figure 14
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Figure 9
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FIGURE 4-18