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ATOC exam 2
ATOC 1060 Fall '09 Exam 2
53
Environmental Studies
Undergraduate 1
10/16/2009

Additional Environmental Studies Flashcards

 


 

Cards

Term
The main salt ion in seawater, based on mass (weight %) is ________?
Definition
Cl-, Chloride
Term
The average salinity of the world's oceans in approximate 35 percent. True of false?
Definition
Term
What is the oceans average salinity? (%)
Definition
3.5%
Term
Sodium (Na+) is the most abundant positive ion in the worlds oceans. (T/F)
Definition
True
Term
The surface waters in the northern pacific ocean (20-40 degrees north latitude) are more saline than the surface waters in the northern Atlantic Ocean. (T/F)
Definition
False
Term
The average residence time in the deep oceans of Antarctic Bottom Water is over 1000 years. (T/F)
Definition
False
Term
The thermohaline conveyor belt is important for the earth system because it plays a dominant role in recycling of nutrients. (T/F) 
Definition
True
Term
Cold, saline water is formed in the North Atlantic and in the weddell sea of antarctica? (T/F)
Definition
True
Term
The oceans are becoming increasingly more salty with time due to input of evaporite deposits from shallow seas. (T/F)
Definition
False
Term
The transport of heat poleward by the oceans in the northern hemisphere peaks at a value of 3 billion megawatts at a latitude of _____?
Definition
20 degrees North
Term

The total northern heat transport in the northern hemisphere is about how large?

 

Definition
6 billion megawatts
Term
If one starts with 100 atoms of radioactive 14C, how many atoms are left after 2 half lives?
Definition
25
Term
14C ("Carbon 14") is a useful tracer of changes in the ocean because it is radioactive with a half-life of about ______ years.
Definition
5000
Term
Satellite measures of cholophyll pigment show where high concentrations of phytoplankton can be found near the ocean surface. (T/F)
Definition
True
Term
The deep ocean is rich in nutrients because when large organisms die, they sink to the bottom of the oceans where they slowly decompose, releasing those nutrients. (T/F)
Definition
True
Term
Some areas of India, Bangladesh, and Myanmar experience as much as _____ of rainfall during the month of July, and as little as _____ of rainfall in the month of January.  
Definition
16 inches(July), 0-2 Inches (January)
Term
Which of the following locations see more precipitation in winter (January) than in summer (July)?
Definition
The US Pacific Northwest (Portland, Seattle, Vancouver)
Term
The ocean gyres generally move in a counterclockwise direction in both the northern and southern hemispheres, (T/F)
Definition
False
Term
The surface ocean does not circulate as a direct response to the surface heating. Instead, surface temperature play a more indirect role by influencing the pattern of global winds that, in turn, determine the circulation of the upper ocean.(T/F) 
Definition
True
Term
Where the south equatorial and North Equatorial currents meet in the pacific Ocean, there is a "counter current" that actually carries water at the equator in an direction opposite that of the equatorial currents. (T/F)
Definition
True
Term
Winds at 40-60 degrees latitudes in both hemispheres tend to blow from the west, which causes ocean currents at these high latitudes of flow eastward, (T/F)
Definition
True
Term
The northern hemisphere, the coriolis effect and friction combine to push the surface ocean current in what angle and direction and relative to the wind?
Definition
20-45 degrees to the right
Term
100 meters below the ocean surface, water moves in what direction relative to currents at the surface?
Definition
180 degrees (directly opposite)
Term
Due to Ekman transport, surface waters in the center of the major ocean gyres actually pile up and form a region of convergence. (T/F)
Definition
True
Term
At the boundary between ocean and land, Ekman transport causes upwelling or downwelling, depending on the direction of the winds at the surface. (T/F)
Definition
True
Term
What is the name given to the top 60-100 meters of the ocean?
Definition
The "surface zone"
Term
What is the sharp transition i density with depth called in the first k of the ocean?
Definition
The pycnocline
Term
What is the gradient in salinity that occurs in the upper ~1 km of the ocean called?
Definition
The halocline
Term
The actual pump that drives the Hadley Circulation is release of _____ during convection.
Definition
latent heat
Term
While tropical circulation is dominated by Hadley circulation, mid-latitude circulation and weather are controlled by ______.
Definition
The location of the polar front zone and mixing of cold polar air with warm air form the tropics
Term
The term ____ refers to a seasonal change in the direction of surface winds. 
Definition
monsoon
Term
The greatest summer/winter temperature differences are seen______?
Definition
over siberia (central russia)
Term

Match the geographic region with the maximum observed annual temperature variation (summer-winter) in that region:

Canada

Siberia 

Australia

South Africa

Hawaii

Definition

Canada---45 degrees C

Siberia--- 60 degrees C

Australia---- 15 degrees C

South Africa--- 20 degrees C

Hawaii---3-5 degrees C

 

Term
The intertropical convergence zone shifts all the way from 20 degN latitude in July to 20 degS lat. in January over Africa, but remains south of the equator in July and January over South America. (T/F) 
Definition
True
Term
The southern oceans surrounding Antarctica (60-70 degS latitudes) are characterized by high pressures in summer and low pressures in winter.(T/F)
Definition
False
Term
Over Siberia the average surface pressure is high in winter (January). (T/F)
Definition
True
Term
At 40 degN latitude, the average surface pressures in July are low over both the Pacific Ocean and the Atlantic Ocean. (T/F)
Definition
False
Term
_______ is the term used to describe the larger range of climate extremes over land compared to over the oceans.
Definition
Continentality
Term

When water changes phases, heat is exchanged between that water and the environment. Match the type of process with the direction of heat exchange (use A for absorbed and R for released)

1. Evaporation

2. Condensation

3. Sublimation

4. Freezing 

5. Melting

 

Definition

1. A

2. R

3. A

4. R

5. A

Term
Convergence
Definition
The merging of air masses that are moving inward toward a low-pressure region
Term
Divergence
Definition
the movement of air outward from a region in the atmosphere
Term
The polar front zone
Definition
the equator-ward moving cold air meets the warm air moving poleward from the subtropics producing a zone of steep temperature gradients
Term
The coriolis effect
Definition
the concept applies to surface winds is the apparent tendency for a fluid (air or water) moving across earth's surface to be deflected from its straight-line path
Term
monsoon
Definition
seasonal reversal in the surface winds
Term
Gyre
Definition
the circulation of gyres is clockwise in the northern hemisphere and counterclockwise in the southern hemisphere
Term
Ekman Spiral
Definition
The deeper below the surface the farther each layer is deflected to the right or left of the surface layer
Term
Downwelling
Definition
where convergence occurs, the accumulated water causes it to sink
Term
Upwelling
Definition
The rising of cooler water to the surface to replace war, divergent surface water
Term
Pycnocline
Definition
The transition zone between the surface zone and the deep ocean is on the order of a kilometer in thickness and is characterized with a rapid increase in density with increasing water depth
Term
Halocline
Definition
Salinity rises rapidly with increasing depth
Term
Thermocline
Definition
the transition where the temperature drops rapidly with increasing depth
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