The spatial and temporal distribution of phytoplankton around the Crozet Plateau, Southern Ocean, is studied through a variety of satellite datasets and in situ cruise and Argo float measurements. Parts of the study area regularly contain phytoplankton concentrations significant…
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Estimates of vertical fluxes of nitrate (JN) into the subsurface chlorophyll maximum from the bottom mixed layer were made in a variety of hydrological regimes over the Celtic Sea in 2003 and 2005. Over a topographically flat shelf JN varied with the spring-neap tidal cycle (1.1…
The Atlantic Meridional Overturning Circulation (MOC) plays an important role in maintaining western Europe’s moderate climate. Although expected to weaken under increasing greenhouse gas concentrations, the magnitude of the response remains uncertain. Monitoring of the Atlantic…
The Atlantic Meridional Overturning Circulation (AMOC) and its variability has received considerable attention, motivated by its major role in the global climate system. Observations of AMOC strength at 26�N made by Rapid-WATCH (Rapid climate change - Will the Atlantic Thermohal…
Antarctic ice shelves play a key role in the global climate system, acting as important sites for the cooling of shelf waters, thereby facilitating deep and bottom water formation. Many of the processes that take place under large ice shelves can be observed more conveniently be…
Most studies of deep-sea benthic fauna have concentrated on soft sediments with little sampling in rocky areas and even less on non-vent mid-ocean ridges and within submarine canyons, mainly as a result of difficulty accessing them. To assess the distribution and abundance of co…
Numerical simulations of buoyant, gravity-driven coastal plumes are summarized and compared to the inviscid geostrophic theory of Thomas & Linden (2007) and to laboratory studies for plumes owing along a vertical-wall coastline (those of Thomas & Linden (2007) and additional exp…
Using satellite imagery to achieve an early and accurate identification of oil spills will contribute towards the reduction of their impact on the marine ecosystem. Satellite imagery provided by the synthetic aperture radar (SAR) sensors are widely used for this task over the mu…
The thickness and continuity of volcanic cover at slow-spreading ridges is variable. Magmatically ‘robust’ regions are interspersed with areas which experience little volcanism. Near the Fifteen-Twenty Fracture Zone (FTFZ), (MAR), volcanism appears exceptionally limited. Here, s…
Echinoderms are keystone organisms that have representatives in virtually every marine ecosystem. They possess a number of features that makes them an excellent model system, namely 1) their susceptibility to changes in the chemistry of seawater and temperature 2) their ossified…
Coccolithophores are a unique group of calcifying phytoplankton that dominate pelagic biogenic calcification and facilitate carbon export. Changes in coccolithophore calcite production through changes in their abundance, species distribution or cellular calcification could affec…
The biological carbon pump (BCP) is a significant part of the global carbon cycle, exporting ∼10Gt of particulate organic carbon (POC) out of the euphotic zone each year. However, most of the exported POC is remineralized biologically within the upper few hundred metres of the m…
Marine dinoflagellates are an ecologically important group of protists within the plankton, performing key process such as photosynthesis, heterotrophy and toxin production. Some dinoflagellates are also capable of producing bioluminescence and they are the most abundant protist…
During a three year occupation of Station Mike (66°N 2°E), the Norwegian Ocean Weather Ship Polarfront was equipped with a range of meteorological and seastate measuring instruments, including the autonomous air-sea flux system “AutoFlux” (Yelland et al., 2009) and an underway Δ…
In the first part of this thesis an overview is given of methods available for the analysis of nanomolar nitrate and phosphate in seawater before going on to describe in more detail a system built in our laboratory comprising liquid waveguide capillary cells connected to a conve…
The magnitudes and pathways of sand transport in Chioggia Inlet, southern Venice Lagoon, and the resulting morphological evolution have been investigated. Bathymetric analysis has established that there is a net export of sediment from the southern Lagoon Basin, and that signifi…
This study quantitatively assesses the mesoscale spatial variability in local nitrate transport and the net nitrate flux associated with an open ocean eddy dipole, using novel data from the SUV‐6 ultra‐violet (UV) nitrate sensor integrated with SeaSoar. The innovative, combined …
Phytoplankton live almost exclusively in the sunlit waters of the euphotic zone. However, in addition to sunlight, phytoplankton require a regular supply of nutrients to grow. In the open ocean such nutrients are abundant in the dark waters below the euphotic zone. Hence, to a l…