The North Atlantic Deep Water surfaces in the Southern Ocean and is modified by surface fluxes to become Antarctic Bottom Water (sinking to the ocean floor) and Antarctic Intermediate water (flowing north at about 100m depth). Refer to the figures of (potential) temperature and salinity to answer the following question:

What is the main surface flux that creates Antarctic Intermediate water?

Question

The North Atlantic Deep Water surfaces in the Southern Ocean and is modified by surface fluxes to become Antarctic Bottom Water (sinking to the ocean floor) and Antarctic Intermediate water (flowing north at about 100m depth). Refer to the figures of (potential) temperature and salinity to answer the following question:

What is the main surface flux that creates Antarctic Intermediate water?

BlackTom AI · Accepted Answer

The question asks which surface flux most strongly contributes to the formation of Antarctic Intermediate Water (AIW), given the context that North Atlantic Deep Water becomes AIW and flows north at ~100 m depth after being modified by surface fluxes.
Option 1: Freshening. A decrease in surface salinity (freshening) reduces density at the ocean surface, promoting lighter water that can reside at intermediate depths and contribute to the AIW formation as it moves northward at shallow depths. This aligns with how AIW is thought to form via buoyancy changes driven by salinity reductions in the surface layer due to precipitation, new ice melt, or freshwater input.
Option 2: Warming. While warming changes temperature, AIW formation at ~100 m depth is more strongly tied to salinity-driven buoyancy changes in this context. Temperature changes alone do not explain the characteristic formation of AIW at shallow depths the way salinity does here.
Option 3: Gaining salinity. An increase in surface salinity would raise surface density and promote deeper, not intermediate, water masses. This would work against the formation of AIW at around 100 m depth and would favor denser water sinking rather than remaining at intermediate levels.
Option 4: Cooling. Cooling increases water density at the surface, which tends to promote sinking and the formation of deeper water masses or Bottom Water, not the intermediate layer described. Therefore it is not the primary surface flux for AIW creation in this scenario.
In summary, the surface flux that most directly reduces surface salinity to generate a lighter, intermediate-depth water mass (AIW) is the freshwater input or freshening process, whereas the other options would either alter temperature without the same buoyancy effect or increase salinity/density, pushing water to other depths.

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