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# Salinity notes

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• A: Pure Water!
• High evaporation so salinity would be greater in the middle of the ocean, along equator, compared to along continents where there is runoff from rivers.
• Red, Med higher due to lack of rain, high evaporation rate
Black and Baltic lower due to large influx of FW and low evaporation rate
• ### Salinity notes

1. 1. Salinity
2. 2. Definition of Salinity • The concentration of ions in a liter of water • The number of grams of dissolved solids in 1000 g of water. – Ex: a 1000 g sample of seawater containing 34.7 g of dissolved material has a salinity of 34.7 parts per 1000 g – In the above example, what is the remaining 96.53%?
3. 3. What units describe salinity? When we measure salinity, we use these descriptive terms: – ‰ = a percent sign with the extra zero to indicate not parts per hundred, but parts per thousand – ppt = parts per thousand
4. 4. Variability in Salinity Even though the proportions of the ions remain the same throughout the ocean (principal of constant proportions), the concentration of ions changes with: – Evaporation – Precipitation Q: what do you think the salinity would look like in the middle of the ocean, along the equator, compared to near the edges of the continents?
5. 5. World Ocean Salinity • Average is 35 ‰ • Red Sea is 40 ‰, Mediterranean Sea is 38 ‰ Q: Why? Look at a map! • Black Sea is 18 ‰, Baltic Sea is 8 ‰ Q: Why? Look at a map!
6. 6. Variability in Salinity cont. Other influences on salinity that we’ll cover later: – Temperature – Pressure – Density Start thinking about how each of these would impact the salinity of the seawater. . . .