The deep sea is cold because its water originates from cold, dense polar regions sinking to the ocean floor
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.
The claim is a well-established oceanographic fact regarding the formation of deep water masses from cold polar regions (such as Antarctic and North Atlantic deep waters) driving global overturning circulation. Multiple retrieved papers explicitly mention deep waters sinking at high latitudes.
Huang H, Gutjahr M, Eisenhauer A, Kuhn G. No detectable Weddell Sea Antarctic Bottom Water export during the Last and Penultimate Glacial Maximum.. 2020. https://doi.org/10.1038/s41467-020-14302-3
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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Heywood KJ, Schmidtko S, Heuzé C, Kaiser J, Jickells TD, Queste BY, Stevens DP, Wadley M, Thompson AF, Fielding S, Guihen D, Creed E, Ridley JK, Smith W. Ocean processes at the Antarctic continental slope.. 2014. https://doi.org/10.1098/rsta.2013.0047
Paper [5] details how water mass transformation processes at the Antarctic continental slope are key to the formation of deep and bottom waters.
Naveira Garabato AC, Frajka-Williams EE, Spingys CP, Legg S, Polzin KL, Forryan A, Abrahamsen EP, Buckingham CE, Griffies SM, McPhail SD, Nicholls KW, Thomas LN, Meredith MP. Rapid mixing and exchange of deep-ocean waters in an abyssal boundary current.. 2019. https://doi.org/10.1073/pnas.1904087116
Paper [6] notes that global ocean overturning circulation transforms cold waters sinking at high latitudes into warmer, shallower waters.
Lozier MS. Overturning in the subpolar North Atlantic: a review.. 2023. https://doi.org/10.1098/rsta.2022.0191
Paper [8] explains the production of dense, deep waters within the subpolar North Atlantic as part of the overturning circulation.
R. Martellucci, F. Paladini de Mendoza, M. Menna, A. Pirro, M. Reale, M. Gačić, P. Poulain, F. Riminucci, J. Le Meur, P. Giordano, L. Langone, V. Cardin, C. Cantoni, C. Bergami, F. Grilli, M. Marini, A. Gallo, G. Notarstefano, Simone Toller, M. Bastianini, M. Krali, T. Diociaiuti, M. Pacciaroni, A. Bussani, S. Miserocchi, E. Mauri. A Multiobservation Analysis of the 2017 Dense Water Formation Events: Climate Change, Bottom Density Currents, and Adriatic‐Ionian Sea Circulation (Mediterranean Sea). 2025. https://doi.org/10.1029/2024jc022306
Paper [10] describes how dense water formation events in polar and subpolar-influenced regions cascade and ventilate deep ocean layers.
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