O Lecture 10/27/10

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definition primary production

OM synthesized from inorganic substances
definition of photosynthesis

producing OM from carbon dioxide and water using light energy
What does photsynthesis consumer and produce
- Consumes Carbon dioxide
- produces Oxygen
What limits primary production int he oceans?

most common - light and nutrients
definition of photos

light
definition of euphotic zone
- rarely deeper than 100 m
- photosynthesis takes places
definition disphotic
- 100-1000 m
- small, but measureable quantities of light
definition of PAR
- photsynthetic active radiation
- 440-700 nanometers
- makes plants grow
How energy remains at 100 meters compared to what falls on the surface

1%
What are the major nutrients
- Carbon
- Nitrate, Nitrite, Ammonium
- Phosphate
- Silicate
What is the redfield ration
- C:N:P
- 106:16:1
Who came up with the law of the minimum?

Justus von Liebeig
Law of the minimum

phytoplankton growth is determined by the response of phytoplankton to the single factor that is most limiting
Where do nutrients come from
- continents
- weathering
- farm fertilizers - runoff
- waste water treatment plants
definition respiration
- consume oxygen
- produce carbon dioxide
- regnerate nutrients
What is the vertical distribution of nutrients?
- deleated in the surface water
- abundant in deep water
how much more inorganic carbon in the global ocean than in the atmosphere

50 x
Solubility pump

amount of carbon dioxide depends on how cold, how fast coming to the surface, and where it is located
The biological pump
- through animals and organic
- sequesterd
- combines biologica processes which transfer organic mater and associated elements to depth
- pathway for rapid c sequestion
What controls carbon export
- an inverted peramid
- c uptake
- c flux - 100m - 5-15% - decades
- C flux - 1000m - 1% - centuries
- c burrial - .1% - millenium
is the ocean an overall sink or source of carbon dioxide
- sink
- location of sinks and sources is not uniform
What elements control algal production
- tempurature
- light
- nutrients
- grazing
- micronutrients
HNLC area

High nutrient low chlorophyll area
What proves that Fe and Zn are limiting micronturutrients

profiles

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green29dive5

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O Lecture 10/27/10

Description

Primary Production

Updated

2010-11-03T17:06:12Z

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