Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 23 for “"AMOC"”.
-
Decadal variability of the Atlantic Meridional Overturning Circulation
… the Atlantic Meridional Overturning Circulation (AMOC) in ocean heat transport, numerous studies have suggested that AMOC variability plays a role in climate variability on a wide range of timescales. My focus is AMOC and ocean buoyancy variability on decadal timescales. Decadal variability of sea …
-
Vertical Structure of Propagating Features
… the Atlantic Meridional Overturning Circulation (AMOC). Interest in this work began when some recent work estimated the inter-annual fluctuations of the AMOC at 26.5 ?N to be<br/>up to 3 Sv, and with a 25% reduction in strength over the last 50 years. There was increased need to understand both …
-
Tidally Forced Marine Ice Stream Instabilities and Their Consequences
… the Atlantic Meridional Overturning Circulation (AMOC). The fingerprinting of the contributions from all major ice sheets for MWP1A and MWP1B is presented, and I propose the St. Lawrence River as the route by which MWP1B entered the ocean. This allows me to present both an updated model of ice …
-
Terrigenous Grain-Size Record of the Newfoundland Ridge Contourite Drift, IODP Site U1411: The First Physical Proxy Record of North Atlantic Abyssal Current Intensity during the Eocene-Oligocene Transition
Atlantic Meridional Overturning Circulation (AMOC) is a vital process that transfers heat and nutrients throughout the world's oceans, helping to regulate global climate and support marine ecosystems. The timing and nature of the shift to modern AMOC, and especially to deep-water formation in the …
-
Investigating sediment size distributions and size-specific Sm-Nd isotopes as paleoceanographic proxy in the North Atlantic Ocean: reconstructing past deep-sea current speeds since Last Glacial Maximum
… Atlantic Meridional Overturning Circulation (AMOC) flow speed, particle size distributions (weight%, Sortable Silt mean grain size) and grain-size separated (0–4, 4–10, 10–20, 20–30, 30–40 and 40–63 µm) Sm-Nd isotopes and trace element concentrations are measured on 12 cores along the …
-
LATE MIOCENE AND PLIOCENE PALEOCEANOGRAPHY OF THE LOW LATITUDE NORTHERN HEMISPHERE AND ITS IMPLICATIONS FOR FUTURE CLIMATE CHANGE
… Atlantic meridional overturn circulation (AMOC), which caused a shoaling of the main tropical thermocline, thereby strengthening the Walker Circulation and weakening the Pacific North Equatorial Counter Current. During the mid-Piacenzian warm period (MPWP; ~3.3-3.0 Ma), SST in the Panama …
-
Multi-decadal Dynamics of Southern Ocean Open-Ocean Polynyas and Deep Convection: Insights from Climate Models
… the Atlantic Meridional Overturning Circulation (AMOC). Convective events enhance Antarctic Bottom Water formation and strengthen the lower overturning cell, while weakening the upper cell, producing a multi-decadal to centennial "seesaw" in AMOC structure that propagates globally through wave and …
-
An inverse modeling approach to investigate deep ocean ventilation from radiocarbon records
… in Atlantic meridional overturning circulation (AMOC), are often invoked to explain the deglacial rise in atmospheric carbon dioxide (CO2) concentration as inferred from ice core records. Much of our current understanding regarding ventilation of the deep ocean during the deglaciation comes from …
-
Modelling large scale ocean circulation : the role of mixing location and meridional pressure gradients for the Atlantic overturning dynamics
… the Atlantic meridional overturning circulation (AMOC) in ocean models is a key task. In recent years, two paradigms have evolved around what are its driving mechanisms: diapycnal mixing and Southern Ocean winds. This work aims at clarifying what sets the strength of the Atlantic overturning …
-
On the external forcing of Indian Ocean climate variability across timescales
… of Atlantic Meridional Overturning Circulation (AMOC) variability during the last glacial period, such as Heinrich stadials, the Bølling–Allerød, and the Younger Dryas. An analysis of single-forcing simulations featuring meltwater addition to the North Atlantic under glacial and interglacial …
-
On the external forcing of Indian Ocean climate variability across timescales
… of Atlantic Meridional Overturning Circulation (AMOC) variability during the last glacial period, such as Heinrich stadials, the Bølling–Allerød, and the Younger Dryas. An analysis of single-forcing simulations featuring meltwater addition to the North Atlantic under glacial and interglacial …
-
Hydrographic structure of overflow water passing through the Denmark Strait
… the Atlantic Meridional Overturning Circulation (AMOC). As such, it is critical to understand how DSOW is transferred from the upstream basins in the Nordic Seas, across the Greenland-Scotland Ridge, and to the North Atlantic Ocean. The goal of this study is to characterize the hydrographic …
-
Hydrographic structure of overflow water passing through the Denmark Strait
… the Atlantic Meridional Overturning Circulation (AMOC). As such, it is critical to understand how DSOW is transferred from the upstream basins in the Nordic Seas, across the Greenland-Scotland Ridge, and to the North Atlantic Ocean. The goal of this study is to characterize the hydrographic …
-
Speleothem-based hydroclimate proxies and Late-Quaternary paleoclimate in the Western Mediterranean
… driving mechanisms include slowdowns of the AMOC, a positive NAO-like circulation pattern, and/or solar forcing. In the second publication, speleothem formation records from Tunisia identify humid and arid periods over the past 300,000 years. Overall, humid phases predominantly occurred …
-
Spatio-temporal characteristics of the Agulhas leakage: a model inter-comparison study
… the Atlantic Meridional Overturning Circulation (AMOC) and the global circulation of heat, salt and freshwater, hence to the global climate. As observations of the leakage are scattered in time and space, ocean model outputs are unavoidable to describe its mechanisms of variability. However, the …
-
The impact of assimilating along-track SLA data on simulated Eddy characteristics in the Agulhas system
… the Atlantic Meridional Overturning Circulation (AMOC). As such, it is important that they are adequately simulated by numerical models in order to advance the accuracy of climate prediction. In the absence of spatially and temporally coherent observing systems, numerical models provide the …
-
Characterization of the Carbonate System across the Agulhas and Agulhas Return Currents
… the Atlantic Meridional Overturning Circulation (AMOC). This study presents for the first time a characterization of the role the Agulhas Current system (Agulhas and Agulhas Return Currents) has on the uptake of anthropogenic CO₂. Fugacity of carbon dioxide (fCO₂ ) values were obtained from a …
-
The role of high-latitude oceans in transient climate change
… Atlantic Meridional Overturning Circulation (AMOC) set the effective heat capacity of the World Ocean and affect the global CRF to greenhouse gas (GHG) forcing. A large fraction of the anomalous surface heat uptake induced by GHGs takes place over the North Atlantic. However, the SO also plays …
-
Future climate evolution in the canary current upwelling system from a regional coupled model
… the Atlantic meridional overturning circulation (AMOC). The southernmost region in CCUS, the Mauritania-Senegal upwelling region (MSUR), is expected to experience seasonal changes mainly defined by Cap-Vert (15ºN), where the upwelling favourable winds in the northern subregion will be intensified …
Page 1 of 2