The image below shows sea surface salinity data from the NASA Aquarius mission. Reds are high salinity, blues are low salinity, and purple is lowest salinity. Notice the very low salinity around Antarctica. What is the most likely explanation?

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**Question: What is a consequence of less sea ice in the Southern Ocean?**

Possible Answers:
1. ( ) more precipitation near Antarctica
2. ( ) more evaporation near Antarctica
3. (•) less evaporation near Antarctica
4. ( ) more ice melt near Antarctica
Transcribed Image Text:**Question: What is a consequence of less sea ice in the Southern Ocean?** Possible Answers: 1. ( ) more precipitation near Antarctica 2. ( ) more evaporation near Antarctica 3. (•) less evaporation near Antarctica 4. ( ) more ice melt near Antarctica
**Title: Understanding Sea Surface Salinity Around Antarctica**

**Sea Surface Salinity Data from NASA's Aquarius Mission**

The image below illustrates sea surface salinity data collected by NASA's Aquarius mission. The salinity levels are represented using different colors: reds indicate high salinity, blues indicate low salinity, and purple denotes the lowest salinity levels. 

**Detailed Description of the Map**

- The map is centered on Antarctica, with the continent shown in gray.
- Surrounding Antarctica, the salinity levels are depicted using a gradient of colors.
- Closest to Antarctica, there is a prominent purple ring, indicating the areas of lowest salinity.
- Beyond the purple ring, there are zones of blue, which indicate low salinity.
- Further from the continent, moving outward, the gradient changes into green and yellow, representing increasing salinity.
- Finally, the red bands signify regions with the highest salinity, located farther away from Antarctica.

**What Causes Low Salinity Around Antarctica?**

The very low salinity around Antarctica, indicated by the purple color, is primarily due to two factors:

1. **Melting Ice:** The melting of icebergs and sea ice introduces a significant amount of freshwater into the ocean, diluting the sea water and lowering its salinity.
   
2. **Precipitation:** The region receives a substantial amount of snowfall, which also contributes to decreasing the saline concentration as the snow melts.

These processes collectively result in the observed very low salinity levels around Antarctica. Understanding these patterns is crucial for studying ocean circulation, climate change, and marine ecosystems.

**Discussion Question:**

What is the most likely explanation for the very low salinity around Antarctica? 

Consider the impacts of ice melt and precipitation in your answer.
Transcribed Image Text:**Title: Understanding Sea Surface Salinity Around Antarctica** **Sea Surface Salinity Data from NASA's Aquarius Mission** The image below illustrates sea surface salinity data collected by NASA's Aquarius mission. The salinity levels are represented using different colors: reds indicate high salinity, blues indicate low salinity, and purple denotes the lowest salinity levels. **Detailed Description of the Map** - The map is centered on Antarctica, with the continent shown in gray. - Surrounding Antarctica, the salinity levels are depicted using a gradient of colors. - Closest to Antarctica, there is a prominent purple ring, indicating the areas of lowest salinity. - Beyond the purple ring, there are zones of blue, which indicate low salinity. - Further from the continent, moving outward, the gradient changes into green and yellow, representing increasing salinity. - Finally, the red bands signify regions with the highest salinity, located farther away from Antarctica. **What Causes Low Salinity Around Antarctica?** The very low salinity around Antarctica, indicated by the purple color, is primarily due to two factors: 1. **Melting Ice:** The melting of icebergs and sea ice introduces a significant amount of freshwater into the ocean, diluting the sea water and lowering its salinity. 2. **Precipitation:** The region receives a substantial amount of snowfall, which also contributes to decreasing the saline concentration as the snow melts. These processes collectively result in the observed very low salinity levels around Antarctica. Understanding these patterns is crucial for studying ocean circulation, climate change, and marine ecosystems. **Discussion Question:** What is the most likely explanation for the very low salinity around Antarctica? Consider the impacts of ice melt and precipitation in your answer.
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