Using this website… http://jules.unavco.org/VoyagerJr/Earth?submit.x=50&submit.y
ID: 231428 • Letter: U
Question
Using this website…
http://jules.unavco.org/VoyagerJr/Earth?submit.x=50&submit.y=10&base=facer&feature=nofeat&fixplate=novel&veltype=model&legendPopup=yes®ion=world_0_0&size=normal
Scroll the Base Map options to see the SeaWiFS maps. SeaWiFS is a satellite that measures many variables in Earth’s ocean life and land life, along with reflectivity of sunlight. The term “bio” here refers to the amount of plant-type life in the oceans and on land by measuring the concentration of chlorophyll produced. This is also a measure of “primary productivity”. The term “reflect” refers to the reflectivity of Earth’s surface by water, ice, snow, soil, vegetation, etc. Both of these variables change with the seasons.
Change your base map to SeaWiFS Bio Jan-Mar. Open the link called Legend and use the Chlorophyll value (you might have to do this repeatedly).
10. Estimate the amount of “primary productivity” in milligrams per cubic meter (mg/m3) in the ocean at about the latitude of Ireland in the North Atlantic, for the Jan-Mar period of time.
11. Estimate the amount of “primary productivity” in milligrams per cubic meter (mg/m3) in the ocean at about the latitude of Ireland in the North Atlantic, for the Apr-Jun period of time.
12. Estimate the amount of “primary productivity” in milligrams per cubic meter (mg/m3) in the ocean at about the latitude of Ireland in the North Atlantic, for the Jul-Sep period of time.
13. Estimate the amount of “primary productivity” in milligrams per cubic meter (mg/m3) in the ocean at about the latitude of Ireland in the North Atlantic, for the Oct-Dec period of time.
14. When do you see the greatest primary productivity around Ireland?
15. Where else in the northern hemisphere oceans do you see the greatest amount of primary productivity at this time? Estimate the amount.
16. At which times of the year do we see the greatest primary production in the southern oceans?
17. Explain the reason for the changing amounts of primary productivity in the northern and southern oceans.
Explanation / Answer
10) Chlorophyll amount during Jauary-March:-2mg/m3
11) Chlorophyll amount during April-June:-3mg/m3
12) Chlorophyll amount during July-September:-2mg/m3
13) Chlorophyll amount during October-December:- 1mg/m3
14) High productivity is occured during April-June
15) Western and Northern Pacific also experienced high productivity :- 20-30mg/m3
16) In southern Ocean greatest primary production is during January-March, that is during northern winter.
17) Primary production is controlled by the amount phytoplankton in the surface waters, which is a function of the stability of the water layer, and the availability of sunlight and nutrients. These two factors change seasonally and geographically. High nutrient levels are mainly associated with areas of upwelling and low nutrient levels are often associated with downwelling. Upwelling is mainly occured during the summer season of both the hemispheres.Intensity of sunlight also higher during summer months of both the hemispheres. So in the Northern Hemisphere high chlorophyll values are observed during the months April to June, that is during northern summer and in the Southern Hemisphere large values are observed during January to March, that is during southern summer.
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