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  • 2000-2004  (14)
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  • 1
    Online Resource
    Online Resource
    San Diego :Elsevier Science & Technology,
    Keywords: Ocean circulation. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (737 pages)
    Edition: 1st ed.
    ISBN: 9780080491974
    Series Statement: Issn Series ; v.Volume 103
    DDC: 551.47
    Language: English
    Note: Cover -- Copyright Page -- Contents -- Contributors -- Foreword -- Preface -- Acknowledgment -- Section 1: The Ocean and Climate -- Chapter 1.1. Climate and Oceans -- 1.1.1 WOCE and the World Climate Research Programme -- 1.1.2 The scientific approach to the complex climate system -- 1.1.3 Ocean-atmosphere interaction and climate -- 1.1.4 Rapid changes related to the oceans -- 1.1.5 Cryosphere and the oceans -- 1.1.6 Anthropogenic climate change and the oceans -- 1.1.7 Future climate research and ocean observing systems -- Chapter 1.2. Ocean Processes and Climate Phenomena -- 1.2.1 A global perspective -- 1.2.2 Air-sea fluxes -- 1.2.3 Ocean storage of heat and fresh water -- 1.2.4 Ocean circulation -- 1.2.5 Ocean transport of heat, fresh water and carbon -- 1.2.6 Climatic and oceanic variability -- 1.2.7 Impacts of ocean climate -- 1.2.8 Conclusion -- Chapter 1.3. The Origins, Development and Conduct of WOCE -- 1.3.1 Introduction -- 1.3.2 Large-scale oceanography in the 1960s and 1970s -- 1.3.3 Ocean research and climate -- 1.3.4 Implementation of WOCE (SSG initiatives) -- 1.3.5 Implementation and oversight -- 1.3.6 Was WOCE a success and what is its legacy? -- Section 2: Observations and Models -- Chapter 2.1. Global Problems and Global Observations -- 2.1.1 Different views of the ocean -- 2.1.2 The origins of WOCE -- 2.1.3 What do we know? -- 2.1.4 The need for global-scale observations -- 2.1.5 Where do we go from here? -- Chapter 2.2. High-Resolution Modelling of the Thermohaline and Wind-Driven Circulation -- 2.2.1 The improving realism of ocean models -- 2.2.2 Historical perspective -- 2.2.3 Basic model design considerations: equilibrium versus non-equilibrium solutions -- 2.2.4 Examples of model behaviour in different dynamical regimes -- 2.2.5 Concluding remarks -- Chapter 2.3. Coupled Ocean-Atmosphere Models -- 2.3.1 Why coupled models?. , 2.3.2 Formulation of coupled models -- 2.3.3 Model drift and flux adjustment -- 2.3.4 Initialization of coupled models -- 2.3.5 Coupled model simulation of present and past climates -- 2.3.6 Coupled model simulation of future climates -- 2.3.7 Climate models, WOCE and future observations -- 2.3.8 Summary and future developments -- Section 3: New Ways of Observing the Ocean -- Chapter 3.1. Shipboard Observations during WOCE -- 3.1.1 The role of hydrographic measurements -- 3.1.2 CTD and sample measurements -- 3.1.3 Current measurements in the shipboard hydrographic programme -- 3.1.4 Shipboard meteorology -- 3.1.5 Summary and conclusions -- Chapter 3.2. Subsurface Lagrangian Observations during the 1990s -- 3.2.1 Determining currents in the ocean -- 3.2.2 Historical aspects: Stommel's -- 3.2.3 The WOCE Float Programme -- 3.2.4 WOCE float observations -- 3.2.5 The future -- Chapter 3.3. Ocean Circulation and Variability from Satellite Altimetry -- 3.3.1 Altimeter observations -- 3.3.2 The ocean general circulation -- 3.3.3 Large-scale sea-level variability -- 3.3.4 Currents and eddies -- 3.3.5 Concluding discussions -- Chapter 3.4. Air-Sea Fluxes from Satellite Data -- 3.4.1 Forcing the ocean -- 3.4.2 Bulk parameterization -- 3.4.3 Wind forcing -- 3.4.4 Thermal forcing -- 3.4.5 Hydrologic forcing -- 3.4.6 Future prospects -- Chapter 3.5. Developing the WOCE Global Data System -- 3.5.1 Organization and planning for WOCE data systems -- 3.5.2 Elements of the WOCE Data System -- 3.5.3 The WOCE Global Data Set and future developments -- Section 4: The Global Flow Field -- Chapter 4.1. The World Ocean Surface Circulation -- 4.1.1 Background -- 4.1.2 Methodology -- 4.1.3 The global mean velocity and velocity variance -- 4.1.4 The wind-driven Ekman currents -- 4.1.5 Future global circulation observations -- Chapter 4.2. The Interior Circulation of the Ocean. , 4.2.1 Processes in the ocean interior -- 4.2.2 Observational evidence -- 4.2.3 Theory of gyre-scale circulation -- 4.2.4 The abyssal circulation -- 4.2.5 Conclusions -- Chapter 4.3. The Tropical Ocean Circulation -- 4.3.1 Flow and water mass transformation patterns -- 4.3.2 Equatorial phenomena in the Pacific Ocean -- 4.3.3 Equatorial Atlantic -- 4.3.4 Near-equatorial circulation in the Indian Ocean -- 4.3.5 Overall conclusions -- Chapter 4.4. Tropical-Extratropical Oceanic Exchange Pathways -- 4.4.1 The role of diffusion and advection -- 4.4.2 Tropical-subtropical exchanges of thermocline waters -- 4.4.3 Tropical-subpolar exchange of Intermediate Waters -- 4.4.4 Summary and further issues -- Chapter 4.5. Quantification of the Deep Circulation -- 4.5.1 Deep circulation in the framework of WOCE -- 4.5.2 Deep Western Boundary Currents -- 4.5.3 The interior: The Deep Basin Experiment -- 4.5.4 Summary -- Chapter 4.6. The Antarctic Circumpolar Current System -- 4.6.1 Flow in the zonally unbounded ocean -- 4.6.2 Observations of the Antarctic Circumpolar Current -- 4.6.3 Dynamics of the ACC -- 4.6.4 Water mass formation and conversion -- 4.6.5 The Southern Ocean and the global overturning circulations -- 4.6.6 Conclusions -- Chapter 4.7. Interocean Exchange -- 4.7.1 Interocean links -- 4.7.2 Bering Strait -- 4.7.3 Indonesian Seas -- 4.7.4 The Agulhas Retroflection -- 4.7.5 Discussion -- Section 5: Formation and Transport of Water Masses -- Chapter 5.1. Ocean Surface Water Mass Transformation -- 5.1.1 The problem -- 5.1.2 Theory of surface water mass transformation -- 5.1.3 Ocean surface temperature, salinity and density -- 5.1.4 Surface fluxes of heat, fresh water and density -- 5.1.5 Surface water mass transformation and formation -- 5.1.6 Summary -- Chapter 5.2. Mixing and Stirring in the Ocean Interior -- 5.2.1 Scales of mixing and stirring. , 5.2.2 Background -- 5.2.3 The Temporal-Residual-Mean circulation -- 5.2.4 Lateral dispersion between the mesoscale and the microscale -- 5.2.5 Diapycnal mixing in and above the main thermocline -- 5.2.6 Mixing in the abyss -- 5.2.7 Discussion -- Chapter 5.3. Subduction -- 5.3.1 A little of the background on oceanic subduction -- 5.3.2 Surface-layer dynamics and thermodynamics of the subduction process -- 5.3.3 Development of steady, continuous models: Application to numerical model analysis and observations -- 5.3.4 Transient response of the thermocline to decadal variability -- 5.3.5 Summary and outlook -- Chapter 5.4. Mode Waters -- 5.4.1 Ventilation and mode water generation -- 5.4.2 Definition, detection and general characteristics of mode waters -- 5.4.3 Geographical distribution of mixed-layer depth and mode waters in the world's oceans -- 5.4.4 Temporal variability of mode water properties and distribution -- 5.4.5 Summary -- Chapter 5.5. Deep Convection -- 5.5.1 Convection and spreading -- 5.5.2 Plumes - the mixing agent -- 5.5.3 Temperature and salinity variability -- 5.5.4 Restratification -- 5.5.5 Summary and discussion -- Chapter 5.6. The Dense Northern Overflows -- 5.6.1 The sources -- 5.6.2 Overflow paths -- 5.6.3 Observed transport means and variability -- 5.6.4 Processes in the overflows -- 5.6.5 Analytical models of the overflow -- 5.6.6 Numerical models of the overflow -- 5.6.7 Overflow variability -- 5.6.8 What have we learnt in WOCE? -- Chapter 5.7. Mediterranean Water and Global Circulation -- 5.7.1 Marginal seas -- 5.7.2 Formation of Mediterranean Water -- 5.7.3 Outflow of Mediterranean Water at the Strait of Gibraltar -- 5.7.4 The effect of Mediterranean Water outflow on the circulation of the North Atlantic and the World Oceans -- Chapter 5.8. Transformation and Age of Water Masses -- 5.8.1 Background. , 5.8.2 Tracer methodology and techniques -- 5.8.3 Exemplary results -- 5.8.4 Outlook -- Section 6: Large-Scale Ocean Transports -- Chapter 6.1. Ocean Heat Transport -- 6.1.1 The global heat balance -- 6.1.2 Bulk formula estimates of ocean heat transport -- 6.1.3 Residual method estimates of ocean heat transport -- 6.1.4 Direct estimates of ocean heat transport -- 6.1.5 Discussion -- 6.1.6 Challenges -- 6.1.7 Summary -- 6.1.8 Outlook for direct estimates of ocean heat transport -- Chapter 6.2. Ocean Transport of Fresh Water -- 6.2.1 The importance of freshwater transport -- 6.2.2 Indirect estimates of oceanic freshwater transport -- 6.2.3 Impacts of uncertainties on model development -- 6.2.4 Direct ocean estimates of freshwater transport -- 6.2.5 Comparison of direct and indirect flux estimates -- 6.2.6 Mechanisms of oceanic freshwater transport -- 6.2.7 Global budgets -- 6.2.8 Summary -- Chapter 6.3. Storage and Transport of Excess CO2 in the Oceans: The JGOFS/WOCE Global CO2 Survey -- 6.3.1 Introduction -- 6.3.2 Background -- 6.3.3 The JGOFS/WOCE Global CO2 Survey -- 6.3.4 Synthesis of Global CO2 Survey data: Review -- 6.3.5 Conclusions and outlook -- Section 7: Insights for the Future -- Chapter 7.1. Towards a WOCE Synthesis -- 7.1.1 Exploiting the WOCE data set -- 7.1.2 Data-based analyses -- 7.1.3 Model evaluation and development -- 7.1.4 Ocean state estimation -- 7.1.5 Summary and outlook -- Chapter 7.2. Numerical Ocean Circulation Modelling: Present Status and Future Directions -- 7.2.1 Remarks on the history of ocean modelling -- 7.2.2 Space-time scales of ocean processes and models -- 7.2.3 Modelling issues -- 7.2.4 Atmospheric forcing and coupling -- 7.2.5 Organization of model development -- 7.2.6 Concluding remarks -- Chapter 7.3. The World during WOCE -- 7.3.1 Assessing the representativeness of the WOCE data set. , 7.3.2 The state of the atmosphere during WOCE.
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  • 2
    Keywords: Hochschulschrift
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (88 Seiten = 6 MB) , Graphen, Karten
    Edition: 2021
    Language: German
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  • 3
    Publication Date: 2019-12-19
    Description: Auswerte- und Synthesephase Forderzeitraum 01.10.1997-31.03.2000 BMBF-Projekt JGOFS IV/ESTOC FKZ: 03F0202A TP 3
    Type: Report , NonPeerReviewed
    Format: text
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  • 4
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    de Gruyter
    In:  In: Bergmann-Schäfer, Lehrbuch der Experimentalphysik. , ed. by Raith, W. de Gruyter, Berlin, pp. 53-130. 2
    Publication Date: 2012-07-13
    Type: Book chapter , NonPeerReviewed
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  • 5
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    AMS (American Meteorological Society)
    In:  Journal of Physical Oceanography, 32 (8). pp. 2205-2235.
    Publication Date: 2018-04-10
    Description: Zonal transports of North Atlantic Deep Water (NADW) in the South Atlantic are determined. For this purpose the circulation of intermediate and deep water masses is established on the basis of hydrographic sections from the World Ocean Circulation Experiment (WOCE) and some pre-WOCE sections, using temperature, salinity, nutrients, and anthropogenic tracers. Multiple linear regression is applied to infer missing parameters in the bottle dataset. A linear box-inverse model is used for a set of closed boxes given by sections and continental boundaries. After performing a detailed analysis of water mass distribution, 11 layers are prescribed. Neutral density surfaces are selected as layer interfaces, thus improving the description of water mass distribution in the transition between the subtropical and subpolar latitudes. Constraints for the inverse model include integral meridional salt and phosphorus transports, overall salt and silica conservation, and transports from moored current meter observations. Inferred transport numbers for the mean meridional thermohaline overturning are given. Persistent zonal NADW transport bands are found in the western South Atlantic, in particular eastward flow of relatively new NADW between 20° and 25°S and westward flow of older NADW to the north of this latitude range. The axis of the eastward transport band corresponds to the core of property distributions in this region, suggesting Wüstian flow. Part of the eastward flow appears to cross the Mid-Atlantic Ridge at the Rio de Janeiro Fracture Zone. Results are compared qualitatively with deep float observations and results from general circulation models
    Type: Article , PeerReviewed
    Format: text
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  • 6
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    AMS (American Meteorological Society)
    In:  Journal of Physical Oceanography, 34 (3). pp. 566-581.
    Publication Date: 2020-08-04
    Description: Two major water masses dominate the deep layers in the Mariana and Caroline Basins: the Lower Circumpolar Water (LCPW), arriving from the Southern Ocean along the slopes north of the Marshall Islands, and the North Pacific Deep Water (NPDW) reaching the region from the northeastern Pacific Ocean. Hydrographic and moored observations and multibeam echosounding were performed in the East Mariana and the East Caroline Basins to detail watermass distributions and flow paths in the area. The LCPW enters the East Mariana Basin from the east. At about 13°N, however, in the southern part of the basin, a part of this water mass arrives in a southward western boundary flow along the Izu–Ogasawara–Mariana Ridge. Both hydrographic observations and moored current measurements lead to the conclusion that this water not only continues westward to the West Mariana Basin as suggested before, but also provides bottom water to the East Caroline Basin. The critical throughflow regions were identified by multibeam echosounding at the Yap Mariana Junction between the East and West Mariana Basins and at the Caroline Ridge between the East Mariana and East Caroline Basins. The throughflow is steady between the East and West Mariana Basins, whereas more variability is found at the Caroline Ridge. At both locations, throughflow fluctuations are correlated with watermass property variations suggesting layer-thickness changes. The total transport to the two neighboring basins is only about 1 Sverdrup (1Sv ≡ 106 m3 s−1) but has considerable impact on the watermass structure in these basins. Estimates are given for the diapycnal mixing that is required to balance the inflow into the East Caroline Basin. Farther above in the water column, the high-silica tongue of NPDW extends from the east to the far southwestern corner of the East Mariana Basin, with transports being mostly southward across the basin.
    Type: Article , PeerReviewed
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  • 7
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    Academic Press
    In:  Academic Press, San Diego, USA; London, UK, 715 pp. ISBN 0-12-641351-7
    Publication Date: 2020-03-25
    Type: Book , PeerReviewed
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  • 8
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    AMS (American Meteorological Society)
    In:  Journal of Physical Oceanography, 30 (12). pp. 3191-3211.
    Publication Date: 2020-08-04
    Description: The circulation of the low-salinity Antarctic Intermediate Water in the South Atlantic and the associated dynamical processes are studied, using recent and historical hydrographic profiles, Lagrangian and Eulerian current measurements as well as wind stress observations. The circulation pattern inferred for the Antarctic Intermediate Water supports the hypothesis of an anticyclonic basinwide recirculation of the intermediate water in the subtropics. The eastward current of the intermediate anticyclone is fed mainly by water recirculated in the Brazil Current and by the Malvinas Current. An additional source region is the Polar Frontal zone of the South Atlantic. The transport in the meandering eastward current ranges from 6 to 26 Sv (Sv = 10(6) m(3) s(-1)). The transport of the comparably uniform westward flow of the gyre varies between 10 and 30 Sv. Both transports vary with longitude. At the western boundary near 28 degreesS, in the Santos Bifurcation, the westward current splits into two branches. About three-quarters of the 19 Sv at 40 degreesW go south as an intermediate western boundary current. The remaining quarter flows northward along the western boundary. Simulations with a simple model of the ventilated thermocline reveal that the wind-driven subtropical gyre has a vertical extent of over 1200 m. The transports derived from the simulations suggest that about 90% of the transport in the westward branch of the intermediate gyre and about 50% of the transport in the eastward branch can be attributed to the wind-driven circulation. The structure of the simulated gyre deviates from observations to some extent. The discrepancies between the simulations and the observations are most likely caused by the interoceanic exchange south of Africa, the dynamics of the boundary currents, the nonlinearity, and the seasonal variability of the wind field. A simulation with an inflow/outflow condition for the eastern boundary reduces the transport deviations in the eastward current to about 20%. The results support the hypothesis that the wind field is of major importance for the subtropical circulation of Antarctic Intermediate Water followed by the interoceanic exchange. The simulations suggest that the westward transport in the subtropical gyre undergoes seasonal variations. The transports and the structure of the intermediate subtropical gyre from the Parallel Ocean Climate Model (Semtner-Chervin model) agree better with observations.
    Type: Article , PeerReviewed
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  • 9
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    Pergamon Press
    In:  Deep Sea Research Part II: Topical Studies in Oceanography, 49 (17). pp. 3427-3440.
    Publication Date: 2020-08-05
    Description: To study the EasternBoundaryCurrentsystem off Northwest Africa in detail several CTD/ADCP-sections and long-term mooring work were carried out in the channel between Lanzarote and Africa. The observations are compared with a fine-resolution model, which was developed in the framework of the CANIGO project. The water masses, which are observed in this area, are characterised and classified in density ranges. The current field shows a high spatial and temporal variability with maximum velocities of about 35 cm/s. Seasonal means as well as currents averaged across the channel are only a few cm/s. In the surface water a steady southward flow in the middle of the channel indicates the CanaryCurrent in this area. During fall a strong northward current is observed close to the African shelf. Though the CanaryCurrent strengthens during summer and fall due to an increase of the trade winds, the transport in the channel decreases or turns northward during that time due to the enhanced poleward current at the eastern side. A northward undercurrent with a mean velocity of +2.3 cm/s is observed at the African slope in 950 m depth. The poleward transport of AAIW increases during fall and a strong influence of relatively fresh AAIW is observed during that time. Most of the observations fit well to the results of the CANIGO model, but the occurrence of MW at the bottom of the channel and the corresponding southward flow cannot be resolved by the model.
    Type: Article , PeerReviewed
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  • 10
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    AGU (American Geophysical Union)
    In:  Geophysical Research Letters, 27 (9). pp. 1243-1246.
    Publication Date: 2018-02-14
    Description: The salinity, temperature and current distributions have been measured during the TROPAC cruise (Oct./Nov. 1996) at two sections, i.e. 143°E and 150°E, during the final phase of the 1995/1996 La Niña. The results present evidence that the fresh pool and the salinity front at its eastern boundary had moved far to the west, and that a barrier layer existed in that phase. The observed currents support the idea that advective processes play an essential role in creating the thermohaline structure during this ENSO phase. In relation with this process, it is found that the westward subduction mechanism of relatively dense eastern equatorial waters may apply during that phase.
    Type: Article , PeerReviewed
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