Download - Physical Oceanography Chap. 15 The Oceans Sea Water Ocean Movements

Physical OceanographyPhysical OceanographyChap. 15Chap. 15Chap. 15Chap. 15

The Oceans

Sea Water

Ocean Movements

The Oceans – 15.1ObjectivesObjectives• identify methods used by scientists to study Earth’s oceans• discuss the origin and composition of the oceans.• describe the distribution of oceans and major seas

I.I. IntroductionIntroduction

I.I. IntroductionIntroduction

What are some useful features of oceans?What are some useful features of oceans?

A.A. UsesUses

I.I. IntroductionIntroductionA.A. UsesUses

1.1. traveltravel

2.2. fishing/foodfishing/food

3.3. recreationrecreation


B.B. StudyingStudying


B.B. StudyingStudying1.1. H.M.S. ChallengerH.M.S. Challenger

Measured depth, water temperature, fauna, current, Measured depth, water temperature, fauna, current, and other data. First measured Mariana trench and other data. First measured Mariana trench (26,890 ft.)(26,890 ft.)



2.2. MeteorMeteor

Used sonar to map undersea topographyUsed sonar to map undersea topography

Example CalculationExample Calculation

A sonar signal travels A sonar signal travels about 1500 m/s in ocean about 1500 m/s in ocean water. If it takes 6 seconds water. If it takes 6 seconds for a signal to return to the for a signal to return to the ship after it is emitted what ship after it is emitted what is the distance to the ocean is the distance to the ocean floor?floor?



2.2. MeteorMeteor

3.3. TOPEX-PoseidonTOPEX-Poseidon

NASA satellite that measures ocean dataNASA satellite that measures ocean data

TOPEX/PoseidonTOPEX/Poseidon

• tracks ocean tides• measures sea levels (to 5 cm accuracy)• monitors climates by measuring ocean temperatures.

II.II. Ocean originsOcean origins

II.II. Ocean originsOcean originsA.A. Oceans are as old as Earth’s rocksOceans are as old as Earth’s rocks


1.1. Lava flows have been dated at 4.6 b.y.Lava flows have been dated at 4.6 b.y.


1.1. Lava flows have been dated at 4.6 b.y.Lava flows have been dated at 4.6 b.y.

2.2. These formed rocks by cooling quickly These formed rocks by cooling quickly (in water)(in water)


B.B. Source of waterSource of water


B.B. Source of waterSource of water1.1. Comets (dirty snow Comets (dirty snow

balls)balls)

http://upload.wikimedia.org/wikipedia/commons/d/df/Comet-Hale-Bopp-29-03-1997_hires_adj.jpg


B.B. Source of waterSource of water1.1. Comets (dirty snow balls)Comets (dirty snow balls)

2.2. Water was trapped in Water was trapped in Earth when it formed. Earth when it formed. Volcanoes released this Volcanoes released this into the atmosphere.into the atmosphere.

III.III. Earth’s WaterEarth’s Water

This is also called the hydrosphereThis is also called the hydrosphere

A.A. LocationLocation

Where is the Earth’s water found?Where is the Earth’s water found?


Type Percentage Volume Used in Model

Total 100 % 2000 mL

The HydrosphereThe Hydrosphere


Total 100 % 2000 mL

Salt Water (oceans) 97.2%



Total 100 % 2000 mL

Salt Water (oceans) 97.2% 1941 mL

Fresh Water 2.8%

Ice

Underground

Surface

Soil & Air



Total 100 % 2000 mL


Fresh Water 2.8% 56 mL

Ice 2.3%

Underground

Surface

Soil & Air



Total 100 % 2000 mL



Ice 2.3% 46 mL

Underground 0.4%

Surface

Soil & Air



Total 100 % 2000 mL



Ice 2.3% 46 mL

Underground 0.4% 8 mL

Surface ~ 0.05% 1 mL

Soil & Air ~ 0.01% 0.2 mL



B.B. Amount of frozen water has variedAmount of frozen water has varied



B.B. Amount of frozen water has variedAmount of frozen water has varied1.1. During ice ages as much as 10% of During ice ages as much as 10% of

hydrosphere was frozen.hydrosphere was frozen.



B.B. Amount of frozen water has variedAmount of frozen water has varied1.1. During ice ages as much as 10% of During ice ages as much as 10% of

hydrosphere was frozen.hydrosphere was frozen.

2.2. Sea level varied by hundreds of Sea level varied by hundreds of meters.meters.

Due to melting of glaciers and tectonic forces altering Due to melting of glaciers and tectonic forces altering sea floor.sea floor.


C.C. Most of Earth’s surface is covered Most of Earth’s surface is covered by water (71%)by water (71%)


1.1. The The hemisphere contains hemisphere contains higher percentage of water.higher percentage of water.

III.III. Earth’s WaterEarth’s WaterC.C. Most of Earth’s surface is covered Most of Earth’s surface is covered

by water (71%)by water (71%)



1.1. The The southernsouthern hemisphere contains hemisphere contains higher percentage of water.higher percentage of water.

2.2. All oceans are connected.All oceans are connected.





3.3. Pacific, Atlantic, and Indian oceans Pacific, Atlantic, and Indian oceans are main oceans.are main oceans.






4.4. Seas are partly or mostly surrounded Seas are partly or mostly surrounded by land.by land.






4.4. Seas are partly or mostly surrounded Seas are partly or mostly surrounded by land.by land.

5.5. Sea ice forms in the Arctic and Sea ice forms in the Arctic and Antarctic seas.Antarctic seas.

The End

Seawater - 15.2

ObjectivesObjectives• compare & contrast physical and chemical properties of seawater• explain ocean layering• describe the formation of deep-water masses

I.I. Chemical PropertiesChemical Properties

A measure of the dissolved salts in water.A measure of the dissolved salts in water.

I.I. Chemical PropertiesChemical PropertiesA.A. SalinitySalinity


1.1. Sea water is about 35 parts per Sea water is about 35 parts per thousand (ppt) saltsthousand (ppt) salts


1.1. Sea water is about 35 parts per Sea water is about 35 parts per thousand (ppt) saltsthousand (ppt) salts

2.2. Salts include NaSalts include Na++, Cl, Cl-- , SO , SO442-2-, Mg, Mg2+2+, ,

CaCa2+2+, K, K++, HCO, HCO33--, and others, and others


3.3. The salinity varies and is lower The salinity varies and is lower where there is . . .where there is . . .



a.a. a lot of precipitationa lot of precipitation




b.b. an estuary/river deltaan estuary/river delta




b.b. an estuary/river deltaan estuary/river delta

c.c. melting of glaciersmelting of glaciers


4.4. Source of sea saltSource of sea salt



a.a. the atmosphere (Clthe atmosphere (Cl- - and SOand SO442-2-))



a.a. the atmosphere (Clthe atmosphere (Cl- - and SOand SO442-2-))

b.b. weathering rocks (Naweathering rocks (Na++, K, K++, Ca, Ca2+2+ from feldspar)from feldspar)



5.5. Removing sea saltRemoving sea salt



5.5. Removing sea saltRemoving sea salta.a. deposited when water evaporatesdeposited when water evaporates




b.b. carried via sea spraycarried via sea spray




b.b. carried via sea spraycarried via sea spray

c.c. marine organisms use it in marine organisms use it in building shells, bones, and teethbuilding shells, bones, and teeth

II.II. Physical PropertiesPhysical Properties

II.II. Physical PropertiesPhysical PropertiesA.A. Density is greater than 1.00 g/cmDensity is greater than 1.00 g/cm33

Density of fresh water is 1.00 g/cmDensity of fresh water is 1.00 g/cm33

Can be as low as -2Can be as low as -2ºCºC


B.B. Freezing point is less than 0Freezing point is less than 0ºCºC



C.C. Light absorptionLight absorption



C.C. Light absorptionLight absorption1.1. Water absorbs lightWater absorbs light

The ocean is completely dark at depths > 100 mThe ocean is completely dark at depths > 100 m



C.C. Light absorptionLight absorption1.1. Water absorbs lightWater absorbs light

2.2. Some colors penetrate Some colors penetrate further than othersfurther than others

II.II. Physical PropertiesPhysical PropertiesD.D. LayersLayers


1.1. The deeper you go the _____ the temp.The deeper you go the _____ the temp.


1.1. The deeper you go the The deeper you go the coolercooler the temp. the temp.

2.2. Temperature profiles show water Temperature profiles show water depth/temperature relationshipdepth/temperature relationship




3.3. The The thermoclinethermocline is a layer in which the is a layer in which the temperature decreases linearly with temperature decreases linearly with depthdepth




3.3. The The thermoclinethermocline is a layer in which the is a layer in which the temperature decreases linearly with temperature decreases linearly with depthdepth

4.4. There is no thermocline for polar seasThere is no thermocline for polar seas

II.II. Physical PropertiesPhysical PropertiesE.E. Water massesWater masses


1.1. Cold water comes from polar seasCold water comes from polar seas



2.2. Surface water sinks as salinity Surface water sinks as salinity increases due to sea ice formationincreases due to sea ice formation



2.2. Surface water sinks as salinity Surface water sinks as salinity increases due to sea ice formationincreases due to sea ice formation

3.3. Deep currents carry water to the Deep currents carry water to the equatorequator

The End

Ocean Movements – 15.3

ObjectivesObjectives• describe the

physical properties of waves

• explain how tides form

• compare and contrast various ocean currents

http://tv-antenna.com/heavy-seas/3/

http://tv-antenna.com/heavy-seas/3/

I.I. WavesWaves

Periodic movement that carries energy from one Periodic movement that carries energy from one place to another.place to another.

I.I. WavesWavesA.A. Wave characteristicsWave characteristics


1.1. CrestCrest

The peak of a waveThe peak of a wave

http://ans.hsh.no/home/bji/Fys01/week8/nasa/



1.1. CrestCrest

2.2. TroughTrough

Lowest part of a waveLowest part of a wave




1.1. CrestCrest

2.2. TroughTrough

3.3. WavelengthWavelength

Distance between successive wave crests (or troughs)Distance between successive wave crests (or troughs)




1.1. CrestCrest

2.2. TroughTrough

3.3. WavelengthWavelength

4.4. Wave heightWave height

Depends on wind speed, wind duration, and fetch.Depends on wind speed, wind duration, and fetch.


5.5. BreakersBreakers

Collapsing wavesCollapsing waves



More friction with ocean bottom causes waves to More friction with ocean bottom causes waves to slow.slow.

a.a. Waves slow Waves slow downdown



The tops of the waves collapse forward because the The tops of the waves collapse forward because the bottoms are being slowedbottoms are being slowed

a.a. Waves slow Waves slow downdown

b.b. Waves Waves become become unstableunstable

I.I. WavesWavesB.B. TidesTides

Periodic rise and fall of sea level.Periodic rise and fall of sea level.


1.1. High tideHigh tide

Highest level to which water rises (a bulge of water)Highest level to which water rises (a bulge of water)


1.1. High tideHigh tide

2.2. Low tideLow tide

Lowest level water rises (caused by lack of water)Lowest level water rises (caused by lack of water)


3.3. Types of daily cyclesTypes of daily cycles

Caused by topography and latitudeCaused by topography and latitude



Characterized by __ high tides each dayCharacterized by __ high tides each day

a.a. SemidiurnalSemidiurnal



Have one pronounced high tide and one _____ high tideHave one pronounced high tide and one _____ high tide


b.b. MixedMixed




b.b. MixedMixed

c.c. DiurnalDiurnal

Characterized by one ____ ____ each dayCharacterized by one ____ ____ each day


4.4. Cause of tidesCause of tides tutorial

http://www.pbs.org/wgbh/nova/venice/tides.html


4.4. Cause of tidesCause of tides

a.a. Gravity from theGravity from the moon pulls on moon pulls on earth/oceansearth/oceans



a.a. Gravity from theGravity from the moon pulls on moon pulls on earth/oceansearth/oceans

b.b. Centrifugal motion moves the Centrifugal motion moves the water away from Earthwater away from Earth



c.c. During spring tide (unrelated to During spring tide (unrelated to the season) high tides are highestthe season) high tides are highest



c.c. During spring tide (unrelated to During spring tide (unrelated to the season) high tides are highestthe season) high tides are highest

d.d. During neap tide high tides are During neap tide high tides are lower and low tides are higher than lower and low tides are higher than normalnormal



e.e. The sun influences tides to a The sun influences tides to a smaller degreesmaller degree

This is because of the greater distance between Earth This is because of the greater distance between Earth and the sun (compared to Earth and the moon)and the sun (compared to Earth and the moon)

II.II. Ocean CurrentsOcean CurrentsA.A. Density currentsDensity currents

Move bottom water according to temperature and Move bottom water according to temperature and salinity differencessalinity differences


B.B. Surface currentsSurface currents

Driven by surface wind.Driven by surface wind.



Trade winds, prevailing westerlies, polar easterly Trade winds, prevailing westerlies, polar easterly winds. Coriolis effect alters directionswinds. Coriolis effect alters directions

1.1. Follow global wind patternsFollow global wind patterns


B.B. Surface currentsSurface currents1.1. Follow global wind patternsFollow global wind patterns

2.2. Currents from the poles bring Currents from the poles bring colder water, while currents from colder water, while currents from equator bring warmer waterequator bring warmer water



Circular surface ocean currentsCircular surface ocean currents

1.1. Follow global wind patternsFollow global wind patterns

2.2. Currents from the poles bring Currents from the poles bring colder water, while currents from colder water, while currents from equator bring warmer waterequator bring warmer water

3.3. Gyres develop due to landmasses Gyres develop due to landmasses interacting with current flowinteracting with current flow

Major Ocean CurrentsMajor Ocean Currents

II.II. Ocean CurrentsOcean CurrentsC.C. Upwelling brings nutrient-rich Upwelling brings nutrient-rich

water.water.

Movement of cold water upward as surface water is Movement of cold water upward as surface water is blown by offshore windsblown by offshore winds

The End

Download - Physical Oceanography Chap. 15 The Oceans Sea Water Ocean Movements

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