fig. 9-co, p. 233
DESCRIPTION
Fig. 9-CO, p. 233. Fig. 9-1, p. 235. Westerlies. Trade winds. Trade winds. Westerlies. Fig. 9-1, p. 235. Fig. 9-2, p. 235. Fig. 9-3, p. 235. North. Westerlies. Atlantic Current. Gulf. Stream. Canary Current. Stream. North. Equatorial Current. Trade winds. Equator. - PowerPoint PPT PresentationTRANSCRIPT
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Fig. 9-CO, p. 233
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Fig. 9-1, p. 235
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Fig. 9-1, p. 235
Westerlies
Trade winds
Trade winds
Westerlies
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Fig. 9-2, p. 235
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Fig. 9-3, p. 235
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Fig. 9-3, p. 235
WesterliesNorth
Gulf
Trade winds
Stream
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Fig. 9-4, p. 236
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Fig. 9-4, p. 236
60°N
45°NWesterlies
Water moves eastward30°N
Trade winds
15°NB
Equator
Water moves westward
A
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Fig. 9-5a, p. 237
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Fig. 9-5a, p. 237
Wind
Surface water
Net Direction of Ekman transport
45°
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Fig. 9-5b, p. 237
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Fig. 9-5b, p. 237
Wind force
Direction of motionFriction
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Fig. 9-5c, p. 237
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Fig. 9-5c, p. 237
Wind force
Direction of motion
Net flow
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Fig. 9-6, p. 237
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Fig. 9-6, p. 237
B
Trad
e w
ind
N
At 15°N
30°–45°
90° to the right of wind direction is up here
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90° to the right of winddirection is up here
At 15°N30°– 45°
Trade
win
d
Stepped Art
Fig. 9-6, p. 237
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Fig. 9-7a, p. 238
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Fig. 9-7a, p. 238
N60°N
North America
Hill’s center offset to west Europe
W E
Coriolis effect B15°N
Equator
Pressure gradient
S
Pycnocline
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Fig. 9-7b, p. 238
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Fig. 9-7b, p. 238
North Atlantic Current
Gulf Stream Canary
Current
Ekman transport forms dome
. . . Which sinks . . .com-pressing the layers beneath
Thermocline is pushed deeper
. . . forcing those layers to spread
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Fig. 9-7c, p. 238
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Fig. 9-7c, p. 238
Center of hill
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Fig. 9-8a, p. 239
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Fig. 9-8b, p. 239
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Fig. 9-9, p. 240
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Fig. 9-10, p. 240
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Fig. 9-11, p. 241
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Fig. 9-11 top, p. 241
Cold water
W
W C CCape Hatteras
Warm water
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Fig. 9-11a/b, p. 241
Warm water
Warm water
C
W
Cold water
Cold water
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Fig. 9-11c/d, p. 241
Cold water
Cold water
CW
CW
Warm water
Warm water
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Fig. 9-12a, p. 242
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Fig. 9-12b, p. 242
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Table 9-1, p. 243
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Fig. 9-13a, p. 243
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Fig. 9-13a, p. 243
Without the Coriolis effect, ocean gyres would look like this:
With the Coriolis effect, they look like this:
Center of geostrophic “hill” is offset to the west.
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Fig. 9-13b, p. 243
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Fig. 9-13b, p. 243
Steep slope
Top of hillGulf
Stream Canary CurrentSargasso
Sea
Gentle slopeN
Narrow, deep, warm, strong currents
Broad, shallow, cold, weak currents
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Fig. 9-14, p. 244
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Fig. 9-14, p. 244
High-pressure air mass
High-pressure air mass
Pacific Ocean
Atlantic Ocean
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Fig. 9-15a, p. 246
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Fig. 9-15a, p. 246
N
~5°N
Equator 0° latitude
Upwelling
South Equatorial Current~100 m
(330 ft)
Southeast trade wind
Equatorial undercurrent (>100 m)
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Fig. 9-15b, p. 246
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Fig. 9-15b, p. 246
Global Wind-induced Upwelling (cm/day)
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Fig. 9-16a, p. 247
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Fig. 9-16a, p. 247
Wind from north
20° Oregon-California
18° 16°Ekman transport
To the west
ThermoclineOffshore current
Upwelling
Continental shelf
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Fig. 9-16b, p. 247
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Fig. 9-17, p. 247
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Fig. 9-17, p. 247
Wind from south
Ekman transport
20° Oregon-California
18° 16°
To the east
Thermocline
Downwelling
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Fig. 9-18a, p. 248
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Fig. 9-18b, p. 248
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Fig. 9-18b, p. 248
Windrows (convergences where seaweed, debris, and foam accumulate)
DivergenceSea surface Helical vortices
Win
d~ 50 m ~165 ft
~6 m ~20 ftDownwelling
(2–6 cm/sec) Level of no motionUpwelling
(1–2 cm/sec)
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Fig. 9-19a, p. 249
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Fig. 9-19a, p. 249
LMoist air
rises Rainfall
180°H
0
200 m
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L
180º
0
200 m
Moist airrises
Rainfall
H
Surface winds
Upwelling
Thermocline
Warm-waterpool
Stepped Art
Fig. 9-19a, p. 249
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Fig. 9-19b, p. 249
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Fig. 9-19c, p. 249
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Fig. 9-20a, p. 250
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Fig. 9-20a, p. 250
H
Dry air descends
L
H
180°
Indonesia Drought conditions Rainfall
Water is 0.5°–1.0°C warmerWater is
1°C warmer
Shallower thermocline 0
South America
Deeper thermocline 200 m
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Fig. 9-20b, p. 250
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Fig. 9-20c, p. 250
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Fig. 9-21, p. 251
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Fig. 9-21, p. 251
0 0 0 0
150 15050 50Temperature
Wat
er d
epth
(m
)
Plankton
Wat
er d
epth
(ft
)W
ater
dep
th (
m)
Wat
er d
epth
(ft
)
Dissolved nutrients
300 300100 100
Increasing temperature Increasing temperatureNormal Conditions During El Niño
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Fig. 9-22a, p. 252
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Fig. 9-22b, p. 252
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Fig. 9-22c, p. 253
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Fig. 9-22d, p. 253
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Fig. 9-22e, p. 253
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Fig. 9-23, p. 252
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Fig. 9-23, p. 252
4
3
2
1
0
1
Sta
nd
ard
ized
Dep
artu
re
1950 1955 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 2010−3
−2
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Fig. 9-24, p. 253
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Fig. 9-24a, p. 253
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Fig. 9-24a, p. 253
Santa Barbara
Los Angeles
UNITED STATES
San Diego
MEXICO
Normal
11°C
12°
13°
14°
15°
16°
17°
18°
19°
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Fig. 9-24b, p. 253
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Fig. 9-24b, p. 253
11°C
12°
Santa Barbara 13°
Los Angeles 14°
UNITED STATES
15°San Diego 16°
MEXICO 17°
18°
19°
El Niño
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Fig. 9-25, p. 254
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Fig. 9-25, p. 254
30 Ocean surface1.021
1.022
251.023
500 m (1,640 ft)20
1.025Density
(g/cm
3 )1.024
15 1.026
1.027
1,000 m (3,300 ft)T
emp
erat
ure
(°C
)
103,000 m
b
1.028
c 1.029
5a
Seafloor 4,000 m (13,100 ft)
033 34 35 36 37
Salinity (‰)
2,000 m
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Fig. 9-26, p. 255
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Fig. 9-26, p. 255
Warm, shallow currentsCold and salty deep currentsSome areas of deep-water formation
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Fig. 9-27, p. 256
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Fig. 9-28, p. 256
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Fig. 9-28, p. 256
Heating Cooling
Po
lar
reg
ion
s
Eq
uat
ori
al r
egio
ns
Surface flow
Thermocline
Sinking
Deep spreading
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Fig. 9-29, p. 257
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Fig. 9-29, p. 257
Greenland
Strait of Gibraltar Mediterranean Water
Iceland Central Water
Antarctic Intermediate Water
NorthAfrica STC AC AD
0
Europe Antarctica
0
1,000 3,280
2,000 6,560
3,000North Atlantic Deep Water
9,840
Dep
th (
m)
Antarctic Bottom Water
13,120
Dep
th (
ft)
5,000 16,400
6,000 19,680
60°N 50 40 30 20 10Latitude
20 30 40 50 60 70 80°S
4,000
100
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Fig. 9-30a, p. 258
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Fig. 9-30b, p. 258
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Fig. 9-30c, p. 258
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Fig. 9-30d, p. 258
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Fig. 9-30d, p. 258
Directional vanes
Paddle wheel impellor
Dial counter for number of revolutions between start and stop times
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Fig. 9-30e, p. 258
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Fig. 9-30f, p. 258