Call number:
9783030830748 (e-book)
Description / Table of Contents:
This book is dedicated to the analysis of bottom waters flows through underwater channels of the Atlantic Ocean. The study is based on recent observations of the authors, analysis of historical data, numerical modeling, and literature review. For example, studying both the measurements from the World Ocean Circulation experiment in the 1990s and recent measurements reveals the decadal variations of water properties in the ocean. Seawater is cooled at high latitudes, descends to the ocean bottom, and slowly flows to the tropical latitudes and further. This current is slow in the deep basins, but intensifies in the abyssal channels connecting the basins. The current overflows submarine topographic structures and sometimes forms deep cataracts when water descends over slopes by several hundred meters. The flow of Antarctic Bottom Water (AABW) is studied on the basis of CTD sections combined with Lowered Acoustic Doppler Profiling (LADCP) carried out annually, and long-term moored measurements of currents. This book is a collection of oceanographic data, interpretation, and analysis, which can be used by field oceanographers, specialists in numerical modeling, and students who specialize in oceanography.
Type of Medium:
12
Pages:
1 Online-Ressource (XXX, 483 Seiten)
,
Illustrationen, Diagramme
ISBN:
9783030830748
,
978-3-030-83074-8
URL:
Ebook (access only within the AWI network)
DOI:
10.1007/978-3-030-83074-8
Language:
English
Note:
Contents
1 Deep Water Masses of the South and North Atlantic
1.1 General Description
1.2 Global Overturning Circulation
1.3 Mechanisms of the Formation of the Deep and Bottom Waters
1.4 Classifications of Deep and Bottom Waters in the Atlantic
1.5 Upper Circumpolar Water and Upper Circumpolar Deep Water
1.6 North Atlantic Deep Water
1.7 Lower Circumpolar Water and Lower Circumpolar Deep Water, Circumpolar Bottom Water, Southeast Pacific Deep Water, and Warm Deep Water
1.8 Antarctic Bottom Water
References
2 General Overview of Abyssal Pathways, and Channels (for Waters of the Antarctic Origin)
2.1 Propagation of Deep and Bottom Waters as Series of Deep Cataracts
2.2 Propagation of Antarctic Waters in the Abyss of the Atlantic
2.3 Comparison of Spreading of Water Masses
Reference
3 Source Regions
3.1 Weddell Sea and Weddell Gyre
3.2 Agulhas and Cape Basins
3.3 Drake Passage, Scotia Sea, and Georgia Basin
3.3.1 General Description and Bottom Topography
3.3.2 Deep and Bottom Water Masses and Previous Concepts of Circulation
3.3.3 Analysis of Recent Data
3.4 Antarctic Bottom Water in the Argentine Basin
References
4 Exchange Between the Argentine and Brazil Basins; Abyssal Pathways and Bottom Flow Channels (for Waters of the Antarctic Origin)
4.1 General Description
4.2 Vema Channel
4.2.1 Topography and General Description
4.2.2 History of Research and Datasets of Long-Term Observations
4.2.3 Deep and Bottom Waters
4.2.4 Section Along the Channel
4.2.5 Structure of the Flow. Sections Across the Channel
4.2.6 Trends in Potential Temperature and Salinity of the Coldest Bottom Water Observed Since 1972
4.2.7 Salinity Variations
4.2.8 Flow in the Southern Part of the Channel at the Boundary with the Argentine Basin
4.2.9 Moored Observations of Velocities in the Channel
4.2.10 Measurements with the Lowered ADCP
4.2.11 Extreme Transport Velocities of Antarctic Bottom Water in the Deep-Water Vema Channel
4.2.12 Flow of Antarctic Bottom Water from the Vema Channel
4.3 Modeling of Antarctic Bottom Water Flow in the South Atlantic
4.4 Modeling of Antarctic Bottom Water Flow Through the Vema Channel
4.5 Santos Plateau
4.6 Hunter Channel
References
5 Further Propagation of Antarctic Bottom Water from the Brazil Basin
5.1 Brazil Basin
5.2 Flow in the Guiana Basin and Westward Equatorial Channels
5.3 North American Basin
5.4 Eastward Equatorial Channels. The Romanche and Chain Fracture Zones
5.4.1 Research History
5.4.2 Bottom Topography
5.4.3 Hydrography of the Romanche and Chain Fracture Zones
5.4.4 Currents in the Eastern Parts of the Romanche and Chain Fracture Zones
5.4.5 Temperature Distributions Along the Romanche and Chain Fracture Zone
5.4.6 Long-Term Variations in Temperature and Salinity
5.4.7 Inflow of Antarctic Bottom Water and Deep Spillway in the Western Part of the Romanche Fracture Zone
5.4.8 Summary
5.4.9 Abyssal Spillway at the Main Sill in the Chain Fracture Zone
5.4.10 Abyssal Spillway at the Nameless Sill of the Romanche Fracture Zone
5.4.11 Modeling of the Flow in the Romanche Fracture Zone
References
6 Fractures in the Mid-Atlantic Ridge of the North Atlantic
6.1 Vema Fracture Zone
6.1.1 Bottom Topography
6.1.2 Measurements
6.1.3 Structure of Bottom Flow Based on the Measurements in 2006
6.1.4 Bottom Water Transport Based on the Measurements in 2006
6.1.5 Bottom Flow Through the Vema Fracture Zone Based on the Measurements in 2014–2016
6.2 Other Fracture Zones of the Northern Mid-Atlantic Ridge
6.2.1 Strakhov Fracture Zone (Four North Fracture Zone) (3° 53' N)
6.2.2 Bogdanov Fracture Zone (7° 10' N)
6.2.3 Nameless Fracture Zone (7° 28' N)
6.2.4 Vernadsky Fracture Zone (7° 49' N)
6.2.5 Doldrums Fracture Zone (8° N) and a Rift Valley South of It
6.2.6 Arkhangelsky Fracture Zone (9° N)
6.2.7 Ten Degree Fracture Zone (9° 57' N)
6.2.8 Rift Valley South of the Vema Fracture Zone (10° 21' N)
6.2.9 Marathon Fracture Zone (12° 40' N)
6.2.10 Fifteen Twenty Fracture Zone (Cabo Verde Fracture Zone) (15° 16' N)
6.2.11 Kane Fracture Zone (24° N)
6.2.12 Pathways and AABW Transport Through the Northern Part of the MAR
6.3 Modeling of the Flow Through the Northern MAR
References . . . . . . . . . . . . .
7 Eastern Basin Pathways and Further Propagation of Antarctic Bottom Water in the East Atlantic
7.1 General Description
7.2 Mixing Caused by the Barotropic Tide
7.3 Kane Gap
7.4 Angola Basin
References
8 Passages in the East Azores Ridge
8.1 General Description
8.2 Discovery Gap
8.3 Western Gap
8.4 Modeling
References
9 Flows Through the Northern Channels in the North Atlantic
9.1 Charlie Gibbs Fracture Zone
9.2 Overflow in the Denmark Strait
9.3 Overflow in the Faroe-Shetland Channel
9.4 Overflow in the Gibraltar Strait
9.5 Gravity Current in the Bear Island Trough
References
Summary of Research and Integrated Conclusions
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