Light in the Oceans
<ul><li>most life depends upon sun for light energy </li></ul><ul><li>for photosynthesis </li></ul><ul><li>autotrophs  = p...
<ul><li>pigments  - capture light for plants </li></ul><ul><li>ex: chlorophylls, xanthophylls, </li></ul><ul><li>carotenes...
<ul><li>1.  reflected  - back to atmosphere </li></ul><ul><ul><li>more waves, more reflected </li></ul></ul><ul><ul><li>un...
<ul><li>2.  absorbed  - taken up by water, converted to heat </li></ul><ul><ul><li>65% absorbed in first 1 m depth </li></...
white light is made of all colors of the visible spectrum
we see an object as a color because those color wavelengths reflect off of the object and into our eyes
<ul><li>some wavelengths absorbed at shallower depths than others </li></ul><ul><li>in open ocean - blue penetrates deepes...
 
red seaweed green seaweed brown seaweed
photo of red t-shirt at 50 feet depth because of selective absorption - red objects do not appear red at depth – there are...
 
<ul><li>compensation depth   </li></ul><ul><li>depth at which rate of photosynthesis = rate of respiration </li></ul><ul><...
 
<ul><li>Turbidity </li></ul><ul><li>cloudiness of the water </li></ul><ul><li>opposite of water clarity </li></ul>
<ul><li>Turbidity </li></ul><ul><li>measured using  secchi disk </li></ul><ul><li>1 m in estuary to 100 m in open ocean </...
<ul><li>Turbidity </li></ul><ul><li>coastal waters – higher turbidity (= lower  secchi disk depth) </li></ul><ul><li>incre...
turbidity in tropical waters turbidity in temperate waters
 
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Light in the oceans powerpoint

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Light in the oceans powerpoint

  1. 1. Light in the Oceans
  2. 2. <ul><li>most life depends upon sun for light energy </li></ul><ul><li>for photosynthesis </li></ul><ul><li>autotrophs = producers - capture light energy </li></ul><ul><li>to make food (glucose) </li></ul>
  3. 3. <ul><li>pigments - capture light for plants </li></ul><ul><li>ex: chlorophylls, xanthophylls, </li></ul><ul><li>carotenes, phycobilins </li></ul><ul><li>different plants have different pigments </li></ul>red seaweed green seaweed brown seaweed
  4. 4. <ul><li>1. reflected - back to atmosphere </li></ul><ul><ul><li>more waves, more reflected </li></ul></ul><ul><ul><li>unusable by plants </li></ul></ul>sun that reaches ocean surface:
  5. 5. <ul><li>2. absorbed - taken up by water, converted to heat </li></ul><ul><ul><li>65% absorbed in first 1 m depth </li></ul></ul><ul><ul><li>< 1% of light penetrates to 100 m (330 ft.) – in clear water </li></ul></ul><ul><ul><li>therefore autotrophs must be near surface </li></ul></ul>
  6. 6. white light is made of all colors of the visible spectrum
  7. 7. we see an object as a color because those color wavelengths reflect off of the object and into our eyes
  8. 8. <ul><li>some wavelengths absorbed at shallower depths than others </li></ul><ul><li>in open ocean - blue penetrates deepest </li></ul><ul><li>different plants at different depths have different pigments to use different </li></ul><ul><li>wavelengths </li></ul>selective absorption
  9. 10. red seaweed green seaweed brown seaweed
  10. 11. photo of red t-shirt at 50 feet depth because of selective absorption - red objects do not appear red at depth – there are no red wavelengths to reflect no flash flash
  11. 13. <ul><li>compensation depth </li></ul><ul><li>depth at which rate of photosynthesis = rate of respiration </li></ul><ul><li>phytoplankton above compensation depth make enough food </li></ul><ul><li>phytoplankton below compensation depth starve </li></ul><ul><li>waves often carry phytoplankton below compensation depth </li></ul>
  12. 15. <ul><li>Turbidity </li></ul><ul><li>cloudiness of the water </li></ul><ul><li>opposite of water clarity </li></ul>
  13. 16. <ul><li>Turbidity </li></ul><ul><li>measured using secchi disk </li></ul><ul><li>1 m in estuary to 100 m in open ocean </li></ul>
  14. 17. <ul><li>Turbidity </li></ul><ul><li>coastal waters – higher turbidity (= lower secchi disk depth) </li></ul><ul><li>increased suspended solids: </li></ul><ul><li>soil organic matter sewage plankton </li></ul><ul><li>dissolved substances </li></ul><ul><li>compensation depth is shallower </li></ul><ul><li>blue wavelengths do not penetrate as deep </li></ul><ul><li>water appears green and brown </li></ul><ul><li>get different phytoplankton species in coastal, estuarine, and oceanic waters </li></ul>
  15. 18. turbidity in tropical waters turbidity in temperate waters

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