4. Why did Benjamin Franklin make
his map?
First Postmaster General of U.S.,
he wanted to speed the mails
across the Atlantic.
Benjamin Franklin – 1700’s
– Published map of Gulf Stream based
on fishermen’s and merchants’
experiences
“You may delay but time will not.”
Benjamin Franklin
6. Benjamin Franklin’s map and
satellite photo of Gulf Stream
“You may delay but time will not wait.”
Benjamin Franklin
7. The Challenger Expedition
(1872-76)
Comprehensive scientific expedition
Naval corvette fitted with laboratories, winches,
and sounding facility and headed by C.Wyville
Thompson
Circumnavigated whole of the world
361 sounding stations covered
Collected large number of deep-sea water samples
Investigated deep-water motion
Temperature measurements made at all depths
Thousands of biological and sea-bottom sediment
samples were collected
4717 new species were identified
The analyses of samples collected took several decades
Mariana’s trench depth was measured first time
9. Challenger’s expedition-
The first global oceanographic cruise for scientific study was made
by the British ship, the HMS Challenger during (1872-1876).
10.
11. Whole of Atlantic ocean first time scientifically
studied by Meteor expedition(1925-27)
12.
13. Jacques Cousteau
(1910-1997)
Most famous oceanographer of the
20th century
If we go on the way
we have, the fault is
our greed... if we are
not willing [to
change], we will
disappear from the
face of the globe, to
be replaced by the
insect.
~ Jacques Cousteau
14. Submersibles- ALVIN &
BATHYSCAPE
were made by Woods Hole
Oceanographic Institution and
can carry 3 passengers to
depths up to 4500m (14,764 ft.),
to explore the ocean, to see the
marine environment physically
and record data.
Jacques Cousteau- Inventor of
Aqualung- today’s SCUBA; he
was a champion to see the
pollution physically in the deep
oceans—and worried about the
man’s exploitation of the earth-
as the destroyer of the marine
environment.
15. Can you say what it is?
The picture below is a _____________.submersible
17. A technological revolution in
today’s Oceanographic studies.
Scripps Institution of Oceanography
developed FLIP (Floating
Instrumentation Platform)- a boat
that turns vertically for research at
different depths and can go
horizontally like a ship
Today’s Oceanography- FLIP
Can you believe when FLIP is in its vertical
position it is extremely stable even under
high storm waves!!.
It is used to study the way water circulates,
how storm waves are formed, how heat is
exchanged between the ocean and the
atmosphere, and the sound made by
underwater marine animals etc.
18. The Glomar Challenger
Deep Sea Drilling Project Ship
(1968 to 1983)
It has a huge
derrick that
can reach a
previous
pin hole
made at
the sea
bottom at
any time
and is
governed
by
SATNAV
19. MONEX
To investigate thoroughly and collect real time
data over the Indian Ocean in 1979,Monsoon
Experiment was conducted
It was arranged jointly by W.M.O and ICSU
under GARP
USSR: 5 ships, INDIA: 4 ships& one air
craft,France: 1ship & program for constant level
balloons, USA: 3 air crafts with drop sondes and
1geo stationary satellite (GOES).
20. See the area influenced by
Monsoon-obtained from Monex
21. Results of monsoon- See how
monsoon winds are blowing
These
winds were
derived by
cloud
vectors with
the help of
INSAT- 1 on
5.7.1979 at
600m level
at 10 A.M
25. 70.8% of the Earth is
covered by ocean
Oceans contain 97.2% of
water on the surface of
the earth
26. Major Oceans
The three major oceans are :
1._______the largest, deepest, coldest and the
least salty.
2.__________the second largest, shallow,
warm and salty.
3. _________ intermediate in depth,
temperature and salinity.
The _______Ocean near the north pole, and the
____________ Ocean near the south pole
contain vast expanses of sea ice.
Pacific
Atlantic
Indian
Arctic
Antarctic
27. Name
Area Avg. Depth
10 6 Km2. m.
Pacific Ocean 165.2 4282
Atlantic Ocean 82.4 3926
Indian Ocean 73.4 3963
Southern Ocean 32.0 3930
Arctic Ocean 14.0 1205
Greatest Known Depth
m. Name of Region
11,524 Mariana Trench
9074 Puerto Rico Trench
7338 Sunda Trench
6820 South Sandwich Trench
5536 N/A
28. Pacific Ocean:
181,34 x 106 km2
Hmed = 4270 m
Lmax = 19800 km
N:Bering Sea& Gulf of
Alaska
S: Antárctica
W: 147E meridion of
Tasmania
E: 1000E merdion of west
coast of N & S America
29. The ocean's name, derived from
Greek mythology, means the “Sea
of Atlas."
It is the most saline of all the major
oceans; the salinity at the surface in the
open ocean ranges from 33 to 37‰ or (3.3 -
3.7%)
Endangered marine
species are the
manatee,
and the seal (sea
lion)in this ocean.
The Atlantic Ocean is the second-
largest ocean, covering about 1/5
of the Earth's surface.
30. Oceano Atlântico
(OA):
106,57 x 106 km2
Hmed = 3332 m
2848 km < L < 4830
km
N-S: regions of
Antártica and Árctica
E: Cape of Good
Hope (20E)
W: Cape Horn
31. The Indian Ocean is the third largest
body of water in the world, covering
about 20% of the Earth's water surface.
The climate north of the equator is affected
by monsoon wind systems causing rainy
seasons that last for 4 months at a time.
The Indian Ocean was the sight of the
underwater earthquake that caused the
devastating Asian Tsunami of 26 Dec 2004.
32. Indian Ocean:
Area: 74,12 x 106
km2
Hmean = 3890 m
Lmax = 10000 km
N-S: Antártica to
of Asiá
E-W: East Africa
to West Australia
33. It is the world’s fourth largest ocean
and the least and latest to be studied.
It encircles Antarctica, the highest continent
in the world.
May be the site of large oil and gas fields near
the ocean and continental margin.
Its northernmost boundary is defined as 60° S latitude.
39. It is the smallest of the world's five
oceans and the shallowest.
Its salinity is the lowest on an average of the
five major oceans, due to low evaporation, as
well as limited outflow of surrounding waters
Endangered marine species include walruses.
The area has a fragile ecosystem which is
slow to change and slow to recover from
disruptions or damage
The Arctic Ocean occupies a roughly circular basin and covers an
area of about 14,056,000 square km. slightly less than
1.5 times the size of the U.S.
42. Methods of Studying the Ocean
The Topex/Poseidon _____________ orbits 1331
km above the Earth, gathering information about
the oceans.
_____________ maps ocean floor topography
by timing how long it takes sound waves to
bounce off the ocean floor.
Underwater vessels called _________________
investigate the deepest ocean trenches.
satellite
Sonar
submersibles
47. Match the following terms to
their correct letter in the
diagram:
A
B
C
D
E
D
F
G
H
Island Arc
Continental shelf
Continental slope
Abyssal plain
Seamount
Continental rise
Trench
Guyot
Seafloor Topography
A.
B.
C.
D.
E.
F.
G.
H.
65. Temperature structure with depth in
the open ocean
Warmer at top, cooler with depth
Thermocline – region of rapid
change of temperature;
permanent
seasonal
diurnal
Higher temperature, lower density
69. Salinity
Total amount of solid material dissolved in water- Traditional
definition
Typical salinity is 3.5% or 35o/oo
o/oo or parts per thousand (ppt) = grams of salt per kilogram of water
g/Kg
Six elements make up 99% of dissolved solids in seawater
Fig. 5.12
70. Ocean Chemistry and Currents
I. Chemistry of Ocean Water
96.5% Water
Common salts: chlorides, sulfates
Sodiumions(Na+)-31%
Magnesiumions(Mg2+)-4%
Calciumions(Ca2+)-1%
Potassiumions(K+)-1%
Chloride ions(Cl-)-55%
Sulfateions(SO4
2-)-7%
Salts come from erosional
forces, runoff from the
continents
3.5% Salts
72. Salinity
Can you fill the gaps about ocean salinity?
The average salinity of seawater is _____ ppt. Therefore, for
every 1,000 ml water, there are ___ grams of dissolved salts.
The most abundant salt in seawater is ________, but
there are many other salts present in the form of ions.
Near the equator salinity is __________ than average due to
___________________.
Near the poles salinity is __________ than average due to
_______________.
In the Mediterranean the salinity is __________than
average due to __________.
NaCl
35
35
lower
greater precipitation
lower
melting sea ice
higher
evaporation
75. Conductivity-Temperature-Depth (CTD)
T accuracy: ±0.001°C
C accuracy: 0.0003 S/m
~ 0.0024 on PSS
Response time: Time
required for instrument to
respond to temperature of
a new environment.
77. Surface ocean variation of salinity
Polar regions: salinity
is lower due to lots of
rain/snow and runoff
Mid-latitudes: salinity is
higher due to high rate of
evaporation
Equator: salinity is
lower due to lots of rain
81. Density of water
Density of water increases as
temperature decreases
Density of ice is less than density of
water
From 4oC to 0oC density of water
decreases as temperature decreases
86. Relation of Density and salinity
1.022 to 1.030 g/cm3 surface seawater
Ocean layered according to density
Density seawater controlled by
temperature, salinity, and pressure
σt = -0.093 + 0.8149 S –0.000482 S2 +
0.0000068 S3
σt = -0.069 + 1.4708 Cl –0.001570 Cl2 +
0.0000398 Cl3
87.
88.
89.
90. Label the three ocean layers in the diagram below.
Mixed layer
Thermocline
Bottom layer
91. Can you guess the origin of bottom
water in low latitudes?
105. Chapter Review
1. What is the average salinity of seawater?
2. What is the deepest area of the seafloor?
3. What is the largest ocean?
4. Why is the ocean “blue”?
5. What is the force responsible for surface currents?
6. What causes density currents?
7. What causes tides?
8. List the 3 tidal patterns.
9. What is the highest part of a wave called?
10.Name the most saltiest ocean .
35 ppt
trench
Pacific
shorter wavelengths not absorbed
wind
differences in temperature and
salinity
gravity of the sun and moon
diurnal, semidiurnal, mixed
crest
Atlantic