Question

sea surface salinities instructions: using the colored map on the slide, color in the sea surface salinities (it doesnt have to be perfect) and then label the 3 specific salinities on the second slide, and provide an explanation for each.

Explanation:

To solve this, we analyze sea surface salinity patterns:

1. Tropical Regions (e.g., Equatorial Pacific/Atlantic): High salinity (e.g., ~35 - 37 PSU) due to high evaporation (strong solar radiation, warm temperatures) and low freshwater input (less precipitation relative to evaporation here, and limited river runoff in open ocean tropical zones). Color these areas with a dark shade (e.g., red).
2. Polar Regions (Arctic/Antarctic): Low salinity (e.g., ~30 - 34 PSU) because of low evaporation (cold temperatures, ice cover reducing open water for evaporation) and high freshwater input from melting ice and low - density, fresh meltwater. Color these light (e.g., blue).
3. Mid - Latitude Oceans (e.g., North Atlantic Gyre, North Pacific): Moderate salinity (e.g., ~34 - 35 PSU). In subtropical mid - latitudes, evaporation and precipitation are more balanced, and ocean circulation (like gyres) mixes waters. In subpolar mid - latitudes, there’s some freshwater from precipitation and river runoff but also mixing with saltier tropical waters. Color these a medium shade (e.g., yellow).

For labeling, mark regions like:

• Tropical Oceans (e.g., Caribbean, Arabian Sea): High salinity (evaporation > precipitation, limited freshwater).
• Arctic Ocean: Low salinity (ice melt, low evaporation).
• North Atlantic (mid - latitude): Moderate (balanced evaporation/precipitation, circulation).

Answer:

1. Color tropical ocean areas (e.g., near equator) dark (high salinity: evaporation dominates).
2. Color polar oceans light (low salinity: ice melt, low evaporation).
3. Color mid - latitude oceans medium (moderate: balanced processes, circulation).

Label:

• Tropical Zones: High Salinity (evaporation > precipitation, limited freshwater).
• Polar Zones: Low Salinity (ice melt, low evaporation).
• Mid - Latitude Zones: Moderate Salinity (balanced evaporation/precipitation, ocean circulation).