13 ocean productivity exercise part c synthesis

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Instructions

Synthesis

Part C of this exercise examines both “Annual Composite” and “Monthly Climatology” maps from the SeaWiFS website (Ocean Color (Links to an external site.)Links to an external site.) that present ocean chlorophyll levels as a measure of productivity. Selection of any map in the thumbnail images will display it as a full screen image.

For the questions below that concern regions of annual high and low productivity, examine the “Annual Composite” maps of ocean productivity (Ocean Color (Links to an external site.)Links to an external site.) for 1997 to 2010.

  • Select SeaWiFS Chlorophyll Concentration, OGI Algorithm in the second pull-down menu.
  • Select “Annual composite” in the third pull-down menu.
  • Enter “14” as the number of thumbnails.
  • Click a thumbnail to see full scale and expanded maps for that year.

For the questions below that concern regions of annual high and low productivity, examine the “Monthly climatology” maps of ocean productivity, which displays maps for each month.

  • Select SeaWiFS Chlorophyll Concentration, OGI Algorithm in the second pull-down menu.
  • Select “Monthyl climatology” from the third pull-down menu
  • Click the thumbnail for any month to view full scale and expanded maps for that month as composite records for the entire data set (1997 to 2010).

Question 1 5 pts

From your comparison of the annual composite global maps of chlorophyll concentrations in the Atlantic, Pacific and Indian Oceans within Part A of this exercise are there systematic patterns in the locations of regions of low productivity, and can these be attributed to specific oceanographic phenomena?

A strong answer will determine whether there is a consistent patterns in the occurrence of regions of low productivity (expressed in terms of chlorophyll concentrations in mg/m3) in all three ocean basins – Atlantic, Pacific, and Indian – and discuss the specific oceanographic factors (e.g. land run-off, upwelling, downwelling, light & nutrient availability) that result in low productivity in these regions.

Question 2 5 pts

This question involves further evaluation of intra-annual changes in productivity displayed in the monthly climatology maps of chlorophyll concentrations in the Atlantic, Pacific, and Indian Oceans examined for Part B of this exercise. From examination of these monthly maps of chlorophyll concentrations identify two regions of the ocean where the intra-annual changes in primary production can be attributed to light limitation, providing information on the variations in chlorophyll concentrations and other considerations that help verify the role of light limitation as a controlling factor.

A strong answer will describe two regions, specifying locations with appropriate designations (e.g. western equatorial Atlantic) where intra-annual variations in productivity in terms of chlorophyll concentrations (reported in mg/m3), can be attributed to light limitation, explaining the rationale for the regions selected.


Question 3

Bonus Question (5 pt)

This question again involves further evaluation of intra-annual changes in productivity displayed in the monthly climatology global maps of chlorophyll concentrations in the Atlantic, Pacific, and Indian Oceans examined for Part B of this exercise. From examination and comparison of these monthly maps of chlorophyll concentrations identify a region of the ocean where the intra-annual changes in primary production can be attributed to temporal variations in the availability of nutrients, explaining the factors controlling nutrients and providing information on the intra-annual variations in chlorophyll concentrations.

A strong answer will specify the location of the selected region using an appropriate designation (e.g. western equatorial Atlantic) and explain the intra-annual variations in nutrients by describing the processes affecting their supply and their influence on their temporal variations in productivity in terms of chlorophyll concentrations (reported in mg/m3).

 
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