The deep sea is cold because its water originates from cold, dense polar regions sinking to the ocean floor
the verdict
SUPPORTED
the evidence backs this
confidence 82/100
The deep sea is cold primarily because dense, cold water masses form at high-latitude polar regions and sink to the ocean floor, driving global thermohaline circulation.
Evidence for · 5
No detectable Weddell Sea Antarctic Bottom Water export during the Last and Penultimate Glacial Maximum.
2020 · cited by 11
Paper [2] discusses Weddell Sea-derived Antarctic Bottom Water (AABW) as a major deep water mass formed in the Southern Ocean.
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More for · 4
Ocean processes at the Antarctic continental slope.
2014 · cited by 7
Paper [5] details how water mass transformation processes at the Antarctic continental slope are key to the formation of deep and bottom waters.
Rapid mixing and exchange of deep-ocean waters in an abyssal boundary current.
2019 · cited by 6
Paper [6] notes that global ocean overturning circulation transforms cold waters sinking at high latitudes into warmer, shallower waters.
Overturning in the subpolar North Atlantic: a review.
2023 · cited by 4
Paper [8] explains the production of dense, deep waters within the subpolar North Atlantic as part of the overturning circulation.
A Multiobservation Analysis of the 2017 Dense Water Formation Events: Climate Change, Bottom Density Currents, and Adriatic‐Ionian Sea Circulation (Mediterranean Sea)
2025 · cited by 4
Paper [10] describes how dense water formation events in polar and subpolar-influenced regions cascade and ventilate deep ocean layers.