Dissolved Oxygen; Models; Reservoirs

Question 0

Dissolved CO2 in rivers varies

Answer 0

As a response to biological activity.

Question 1

Models: can predict changes in (2)

Answer 1

Runoff, as a result of GH warming.

Streamflow, as a result of deforestation.

Question 2

Residence time is an indication of

Answer 2

How quickly a water molecule in a reservoir can be renewed.

Question 3

Residence time (years) =

Answer 3

mass in reservoir / flux into or from reservoir.

Question 4

Dissolved oxygen: influenced by

Answer 4

Photosynthesis and respiration.

PS is limited at depth; O2 is reduced by respiration.

Question 5

Dissolved oxygen: if levels fall below

Answer 5

Threshold, many organisms will die.

Question 6

Dissolved oxygen: fall in oxygen levels may be

Answer 6

A result of sewage input.

Question 7

Hydrological cycle: (2)

Answer 7

Driven by suns energy and gravity.

Evaporation exceeds precipitation over the oceans (vise versa).

Question 8

Hydrological cycle: Exchange of water by (4)

Answer 8

Evaporation,
Infiltration,
Precipitation,
Surface run off to oceans.