Chemistry

1. Sources
   1. weathering of rocks
      1. transported by rivers
   2. Hydrothermal Vents
2. Distribution higher in coastal waters
   1. due to river runoff
3. concentrations increase in spring
4. higher in pacific because more time accumulate
   1. deep water has more because there is no photosynthesizers to use up nutrients

Adjunto:

• Chemistry - created from Mind Map

1. Essential for:
   1. Photosyntheses
   2. creating cell walls (phospholipids)
   3. Energy Transfer
2. Dissolved Inorganic
   1. Most behavioural form
      1. PO43-
         1. 80% of total Inorganic P
            1. 8.2pH
3. Dissolved Organic
   1. poorly defined
      1. Occurs in surface waters due to:
         1. Plant decompostion
         2. Decomposition and excretion of Marine Animals
4. Sources
   1. Natural Weathering of Apatites

      Nota:

      • E.g. Ca3
   2. Anthropogenic Sources
      1. Chemical and Biological fertilizers
      2. Excretion from farm animals
      3. transported to ocean via rivers
      4. sewage disposal on coasts

1. The rate of Primary Productivity
   1. Photosynthesis by Phytoplankton
2. rate of respiration

Nota:

• NO3

Adjunto:

• Chemistry - created from Mind Map_1

1. Sources
   1. Volcanic Activity (NH3)
   2. Atmospheric

      Nota:

      • NO2 from Nitrogen fixation
   3. Rivers

      Nota:

      • Fertilizers
   4. removed
      1. Fixation
         1. Plants
            1. Carried out by nodular bacteria from land plants
            2. insignificant in water column
            3. when plants die Nitrogen is released back into water column
         2. Phytoplankton
            1. Euphotic zone
            2. rapid removal in spring due to plankton growth
   5. Regeneration
      1. Oxidation of organic nitrogen
      2. excretion of phytoplankton by fish and zooplankton
2. Surface waters have low levels
3. Deep water is rich in Nitrates
   1. Pacific
      1. Higher Concentrations
         1. Water is older thus accumulated more NO3