Bottom water flows in the tropical fractures of the Northern Mid-Atlantic Ridge

Despite the fact that there are numerous estimates of the Antarctic Bottom Water (AABW) formation and transport, its evolution and distribution pathways are still debatable (Morozov E.G. et al., 2010).The main task of this work was to identify the structure and transport of deep and bottom water mass of the fracture zones (7 40', Vernadsky and Doldrums). The research is based on new data (multibeam bottom relief, temperature, salinity, velocity) obtained during the research cruise on the RV "Akademik Nikolaj Strakhov" in October-November 2019 and WODB18 historical data.The main result of the research is proper estimation of the AABW and LNADW transport, which takes into consideration the influence of fracture zone morphometry. Accordingly, the preliminary circulation scheme of water masses is obtained.

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Geothermal heating and episodic cold-seawater intrusions into an isolated ridge-flank basin near the Mid-Atlantic Ridge

Communications Earth & Environment ◽

10.1038/s43247-021-00297-2 ◽

2021 ◽

Vol 2 (1) ◽

Author(s):

Keir Becker ◽

Richard E. Thomson ◽

Earl E. Davis ◽

Heinrich Villinger ◽

C. Geoffrey Wheat

Keyword(s):

Bottom Water ◽

Ocean Bottom ◽

Geothermal Heat ◽

Bottom Water Temperature ◽

Geothermal Heating ◽

Mid Ocean Ridge ◽

Before And After ◽

Bottom Waters ◽

Mid Atlantic Ridge ◽

Ocean Ridge

AbstractSix-year records of ocean bottom water temperatures at two locations in an isolated, sedimented deep-water (∼4500 m) basin on the western flank of the mid-Atlantic Ridge reveal long periods (months to >1 year) of slow temperature rises punctuated by more rapid (∼1 month) cooling events. The temperature rises are consistent with a combination of gradual heating by the geothermal flux through the basin and by diapycnal mixing, while the sharper cooling events indicate displacement of heated bottom waters by incursions of cold, dense bottom water over the deepest part of the sill bounding the basin. Profiles of bottom water temperature, salinity, and oxygen content collected just before and after a cooling event show a distinct change in the water mass suggestive of an incursion of diluted Antarctic Bottom Water from the west. Our results reveal details of a mechanism for the transfer of geothermal heat and bottom water renewal that may be common on mid-ocean ridge flanks.

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Regional Modeling of Antarctic Bottom Water Flows in the Key Passages of the Atlantic

Journal of Geophysical Research Oceans ◽

10.1029/2019jc015315 ◽

2019 ◽

Vol 124 (11) ◽

pp. 8414-8428 ◽

Cited By ~ 3

Author(s):

D. I. Frey ◽

E. G. Morozov ◽

V. V. Fomin ◽

N. A. Diansky ◽

R. Y. Tarakanov

Keyword(s):

Bottom Water ◽

Regional Modeling ◽

Antarctic Bottom Water ◽

Water Flows

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Bottom Water Flows in the Vema Channel and over the Santos Plateau Based on the Field and Numerical Experiments

The Ocean in Motion - Springer Oceanography ◽

10.1007/978-3-319-71934-4_29 ◽

2018 ◽

pp. 475-485

Author(s):

Dmitry I. Frey ◽

Vladimir V. Fomin ◽

Roman Yu. Tarakanov ◽

Nikolay A. Diansky ◽

Nikolay I. Makarenko

Keyword(s):

Numerical Experiments ◽

Bottom Water ◽

Water Flows

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Near bottom water temperature anomalies: Mid-Atlantic Ridge Crest at latitude 26°N

Geophysical Research Letters ◽

10.1029/gl005i012p00993 ◽

1978 ◽

Vol 5 (12) ◽

pp. 993-996 ◽

Cited By ~ 15

Author(s):

Peter A. Rona

Keyword(s):

Water Temperature ◽

Bottom Water ◽

Bottom Water Temperature ◽

Ridge Crest ◽

Temperature Anomalies ◽

Mid Atlantic Ridge

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Flows of bottom water in fractures of the North Mid-Atlantic Ridge

Doklady Earth Sciences ◽

10.1134/s1028334x17060058 ◽

2017 ◽

Vol 474 (2) ◽

pp. 653-656 ◽

Cited By ~ 1

Author(s):

E. G. Morozov ◽

R. Yu. Tarakanov ◽

T. A. Demidova ◽

N. I. Makarenko

Keyword(s):

Bottom Water ◽

The North ◽

Mid Atlantic Ridge

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Investigating methods of phosphorus recovery from eutrophic lakes through hypolimnetic withdrawal and purification

10.5194/egusphere-egu21-6188 ◽

2021 ◽

Author(s):

Soila Silvonen ◽

Juha Niemistö ◽

Jerry Myyryläinen ◽

Simo Huotari ◽

Leena Nurminen ◽

...

Keyword(s):

Food Production ◽

Bottom Water ◽

Pilot Project ◽

Phosphorus Recovery ◽

Eutrophic Lakes ◽

Sustainable Food ◽

Water Flows ◽

Novel Method ◽

P Recycling ◽

Water Treatments

As global reserves of phosphorus (P) become scarce, recycling of P will be key to sustainable food production in future. The hypolimnetic withdrawal and purification circuit (HWPC) is a novel method that aims to remove and capture P accumulated in the near-bottom water of eutrophic lakes. Similar to the basic principle of wastewater treatment, the lake water is treated for the precipitation of P and other elements, and the formed particles are collected in a filtering unit while the purified water flows back into the lake. The method has been tested in a pilot project at Lake Kymij&#228;rvi, southern Finland.In the current study, we observed the efficiency of three different water treatments in the HWPC in terms of P precipitation: 1) water aeration; 2) aeration + Ca(OH)2 addition; 3) aeration + tannin-based biopolymer addition. Moreover, we studied the chemical composition of the precipitate formed in each treatment to understand its potential for P recycling. The aim of the study was to provide a better understanding to further develop and apply techniques to recover and recycle P from eutrophic lakes.

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