Oceanography – OCNG 251 (Spring 2012)
Quiz #3
Quiz #3 (Minimum total of 27 points) Dr. Patrick Louchouarn
Make sure you read the questions completely BEFORE you answer.
Multiple Choice: Answer each question with the one most appropriate answer (8 pts)
1. A highly saline water mass only observed in the Atlantic Ocean and found at ~1000m
depth: a) North Atlantic Deep Water mass; b) Red Sea Intermediate Water mass; c)
Mediterranean Sea Water mass; d) Antarctic Intermediate Water mass; e) Bering Sea
Water mass.
2. Gas(es) that absorb(s) radiation in the I.R. spectrum: a) oxygen; b) ozone; c) CO2; d)
N2; e) a and d; ab) c and d; ac) a and b
3. A t value of 24.02 means: a) a salinity of 24 parts per thousand; b) a potential
temperature of 24.02°C; c) a density of water of 1.02402 g/cm3; d) an isotopic
composition of water of 24.02‰.
4. Layer across which there is a rapid change in water density with depth: a) densocline;
b) thermocline; c) pycnocline; d) halocline; e) verticline.
5. Tidal “bulges” are produced by: a) gravitational force (attraction) of the moon; b)
seismic forces; c) “a” and “d”; d) centrifugal force; e) wind forces; ab) “a” and “b”.
6. If a tsunami is generated by an earthquake just west of Alaska, when would it
(approximately) reach Japan? a) in about 10 days; b) in a week; c) in a few hours; d) in
a month.
7. Which of the following is not true about the Greenhouse Effect? a) It keeps the Earth at
a temperature that can support life; b) light from the sun is converted into heat at the
surface of the earth and radiated back to space, but getting trapped by gasses in the
atmosphere; c) gasses in the atmosphere trap incoming solar radiation; d) water is the
most effective Greenhouse Gas
8. If a storm is blowing in the middle of the Gulf of Mexico, which type of waves will we
experience first on the beach of Galveston Island? a) shallow-water waves; b) shortperiod waves; c) long wavelength waves; d) tsunamis; e) waves with speed defined by
gh
True and False: indicate whether the following statements are true or false (7 pts)
9.
The symbol “t” represents the density of a parcel of water of specific T and S
corrected for the pressure effect at depth: a) true; b) false.
10. If the atmosphere contained no water vapor, CO2, or CH4, the temperature of the
Earth would be about -18C: a) true; b) false.
11. Any object that is a perfect absorber and perfect emitter of the full spectrum of
radiation it receives is called a black body: a) true; b) false.
12. For deep-water waves, changes in pressure are undetectable at a water depth
greater than two wavelengths (L): a) true; b) false.
Oceanography – OCNG 251 (Spring 2012)
Quiz #3
13. Ideal tides are waves with a wavelength of ~20,000 km and a period of ~12 hrs: a)
true; b) false.
14. Cotidal lines connect points at which any given tide level is the same: a) true; b) false.
15. The speed of deep-water waves is NOT affected by the depth of the water column: a)
true; b) false.
Matching: match the statements below with their subsequent counterpart (7 pts)
16.
gL
2p
c)
17. Unobstructed distance over which wave-forming winds blow e)
18. Shallow water wave d)
19. _____ tides: largest high tides within a month’s period ab)
20. _____ tides: smallest high tides within a month’s period b)
21. Time required for two successive wave crests to pass a point a)
22. Points on the water surface that have equal tidal height ac)
a)
Period
b)
Neap
c)
Deep-water wave
d)
tsunami
e)
Fetch
ab)
Spring
ac)
Corange line
Oceanography – OCNG 251 (Spring 2012)
Quiz #3
Interpreting graphs (5 pts):
23. Using at the Figure below, answer the following question: what is the period of a
wave if the wind blows at 30 kn, the fetch is 100 nm, and the wind blows for 20 hrs?
a) ~13 s; b) ~8 m; c) ~8 s; d) ~13 m; e) none of the above.
24. Using at the Figure below, answer the following question: what is the period of a
Using the Figure below, answer the question: How many water masses are there in
the water column at 20ºS? a) 1; b) 5; c) 4; d) 2; e) 3.
Oceanography – OCNG 251 (Spring 2012)
Quiz #3
25. Using the Figure below, answer the question: the horizontal lines in the figure
represent a) wave height at constant wind speed; b) wave energy at constant water
depth; c) wave speed at constant wave length; d) none of the above.
26. The red line on the figure below (a to b) shows: a) the process of water mass dilution;
b) the cooling of water masses in the deep ocean; c) the process of water mass
densification through mixing; d) all of the previous; e) none of the previous.
Oceanography – OCNG 251 (Spring 2012)
Quiz #3
27. The color scheme along any latitude line on the figure below is due to? a) sphericity
of the Earth; b) earth magnetic field; c) seasonal difference in insulation; d) Seasonal
primary productivity in the ocean; e) a and b; ab) b and d; ac) none of the above.
Oceanography – OCNG 251 (Spring 2012)
Quiz #3
Bonus Multiple Choice Questions: Answer each question with the one most
appropriate answer on the separate Scantron sheet – Remember to put your name!
(10% max)
1) Mark Spitz held the all-time Olympic record for what Olympic event? a) athletics; b)
gymnastics; c) swimming; d) horse-back riding; e) diving.
2) What is the origin of Doc Martens? a) French fashion footwear; c) German punk boots;
b) English work shoes; d) Dutch radical boots.
3) How many official languages does Switzerland have? a) 2, b) 3, c) 4, d) 5, e) 1.
4) What soccer star likes a spice? a) Lionel Messi, b) Cristiano Ronaldo, c) David
Beckham, d) Wayne Rooney, e) Landon Donovan
5) Which country(ies) share a border with Botzwana: a) Mali; b) Angola; c) South Africa;
d) Erytrea; e) Tanzania; ab) all of the previous.
6) Who was known as the Lizard King? a) Jimi Hendrix; b) Robert Plant; c) Jim Morrison;
d) Stevie Ray Vaughan; e) Jethro Tull.
7) How long does a sun’s ray take to reach the Earth? a) it is instantaneous; b) five
seconds; c) eight minutes; d) an hour.
8) To collect capers you have to: a) dig the earth; b) climb a ladder; c) bend down; d)
filter water; e) reach the fifth level in Halo; ab) convince Galadriel, the queen of the
wood-elves, to share one of her sacred fruits.
9) What do you call something you tweet about in Twitter, that later becomes a source of
embarrassment for you: a) hashtag; b) tweet; c) twoops; d) twitterverse; e) you don’t or
else you don’t deserve to be on Twitter.
10) In the semi-finals of Women’s World Soccer Cup, France lost to: a) Brazil; b) Japan; c)
U.S.A.; d) England; e) Italy.