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Title

Thermal small steps staircase and layer migration in the Atlantis II Deep, Red Sea

Authors
Albarakati, Alaa M. A.
Ahmad, Fazal
Linke, Peter
Dengler, Marcus
Feldens, Peter
Schmidt, Mark
Al-Farawati, Radwan
Published in Arabian Journal of Geosciences. 2016, vol. 9, no. 5
Abstract Atlantis II Deep, a submarine basin of the Red Sea, is noteworthy because of its hydrothermally active brine pools. High-resolution temperature records from Poseidon Cruise during February 2011 revealed small steps thermal staircase in the lower transition zone from ≈2002 to 2008/2009 m depth at stations. Four vertically well-mixed convective layers, lower convective layer (LCL) and upper convective layers (UCL1–3), separated by high-temperature gradients at the interfaces were observed. The temperature of the layers UCL1–3 has dropped between 2008 and 2011. The top of UCL3 extends to about 2008/2009 m at stations and its average thickness has increased from 3.3 ± 0.5 m in 1992 to 7 m in 2011, whereas the thickness of layers UCL1–2 has decreased from 25.2 ± 0.3 m to 19.8 m and from 16.4 ± 0.5 m to 14.7 m, respectively, during this time. The upward buoyancy flux is 0.032 to 0.038 × 10−7 m2 s−3 which gives migration speed of UCL3 layer from 0.1 to 0.12 m year−1. With this speed, the thermal staircase ≈6 m thick will merge with UCL3 in 50 to 60 years increasing the thickness from 7 m to nearly 13 m.
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Article (Published version) (1.1 MB) - document accessible for UNIGE members only Limited access to UNIGE
Other version: http://link.springer.com/10.1007/s12517-016-2399-5
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Research group Aquatic Physics
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ALBARAKATI, Alaa M. A. et al. Thermal small steps staircase and layer migration in the Atlantis II Deep, Red Sea. In: Arabian Journal of Geosciences, 2016, vol. 9, n° 5. https://archive-ouverte.unige.ch/unige:85605

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Deposited on : 2016-08-02

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