Preprints

Filtering by Subject: Oceanography

Diapycnal motion, diffusion, and stretching of tracers in the ocean

Henri Francois Drake, Xiaozhou Ruan, Raffaele Ferrari

Published: 2022-01-08
Subjects: Applied Mathematics, Fluid Dynamics, Non-linear Dynamics, Oceanography, Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics

Small-scale mixing drives the diabatic upwelling that closes the abyssal ocean overturning circulation. Measurements of in-situ turbulence reveal that mixing is bottom-enhanced over rough topography, implying downwelling in the interior and stronger upwelling in a sloping bottom boundary layer. However, in-situ mixing estimates are indirect and the inferred vertical velocities have not yet been [...]

Quantifying the environmental impact of a major coal mine project on the adjacent Great Barrier Reef ecosystems

Antoine Saint-Amand, Alana Grech, Severine Choukroun, et al.

Published: 2021-12-23
Subjects: Environmental Indicators and Impact Assessment, Environmental Sciences, Oceanography, Oil, Gas, and Energy

A major coal mine project in Queensland, Australia, is currently under review. It is planned to be located about 10 km away from the Great Barrier Reef World Heritage Area (GBRWHA). Sediment dispersal patterns and their impact on marine ecosystems have not been properly assessed yet. Here, we simulate the dispersal of different sediment types with a high-resolution ocean model, and derive their [...]

Components and Tidal Modulation of the Wave Field in a Semi-Enclosed Shallow Bay

Lukas WinklerPrins, John Largier, Ana Vila-Concejo, et al.

Published: 2021-12-10
Subjects: Environmental Engineering, Geomorphology, Oceanography

The wave field in coastal bays is comprised of waves generated by far-off storms and waves generated locally by winds inside the bay and regionally outside the bay. The resultant wave field varies spatially and temporally and is expected to control morphologic features, such as beaches in estuaries and bays (BEBs). However, neither the wave field nor the role of waves in shaping BEBs have been [...]

Sedimentological data-driven bottom friction parameter estimation in modelling Bristol Channel tidal dynamics

Simon Charles Warder, Athanasios Angeloudis, Matthew D Piggott

Published: 2021-11-09
Subjects: Oceanography, Physical Sciences and Mathematics

Accurately representing the bottom friction effect is a significant challenge in numerical tidal models. Bottom friction effects are commonly defined via parameter estimation techniques. However, the bottom friction coefficient (BFC) can be related to the roughness of the sea bed. Therefore, sedimentological data can be beneficial in estimating BFCs. Taking the Bristol Channel and Severn Estuary [...]

GESLA Version 3: A major update to the global higher-frequency sea-level dataset

Ivan D Haigh, Marta Marcos, Stefan A Talke, et al.

Published: 2021-11-05
Subjects: Oceanography

This paper describes a major update to the quasi-global, higher-frequency sea-level dataset known as GESLA (Global Extreme Sea Level Analysis). Versions 1 (released 2009) and 2 (released 2016) of the dataset have been used in many published studies, across a wide range of oceanographic and coastal engineering-related investigations concerned with evaluating tides, storm surges, extreme sea levels [...]

Seismic and Acoustic Monitoring of Submarine Landslides: Ongoing Challenges, Recent Successes and Future Opportunities

Michael Andrew Clare, D. Gwyn Lintern, Ed Pope, et al.

Published: 2021-10-04
Subjects: Geology, Geophysics and Seismology, Oceanography, Sedimentology

Submarine landslides pose a hazard to coastal communities due to the tsunamis they can generate, and can damage critical seafloor infrastructure, such as the network of cables that underpin global data transfer and communications. These mass movements can be orders of magnitude larger than their onshore equivalents and are found on all of the world’s continental margins; from coastal zones to [...]

High interstadial sea levels over the past 420ka from Huon terraces (Papua New Guinea)

Gino de Gelder, Laurent Husson, Anne-Morwenn Pastier, et al.

Published: 2021-09-06
Subjects: Climate, Geology, Geomorphology, Oceanography, Tectonics and Structure

The history of sea level across the Quaternary is essential for assessing past and future climate and geodynamics. Global sea-level reconstructions are typically derived from oxygen isotope curves, but require calibration with geological constraints that are particularly scarce prior to the last glacial cycle (>130 ka). The exceptionally well-preserved coral reef terrace sequence in the Huon [...]

Sea surface salinity subfootprint variability from a global high-resolution model

Frederick M Bingham, Susannah Brodnitz, Severine Fournier, et al.

Published: 2021-08-20
Subjects: Oceanography

Subfootprint variability (SFV) is variability at a spatial scale smaller than the footprint of a sat-ellite, and cannot be resolved by satellite observations. It is important to quantify and understand as it contributes to the error budget for satellite data. The purpose of this study is to estimate the SFV for sea surface salinity (SSS) satellite observations. This is done using a [...]

Safety and Belonging in the Field: A Checklist for Educators

Sarah E Greene, Gwen S. Antell, Jake Atterby, et al.

Published: 2021-08-19
Subjects: Atmospheric Sciences, Biogeochemistry, Climate, Cosmochemistry, Earth Sciences, Education, Environmental Education, Environmental Health and Protection, Environmental Indicators and Impact Assessment, Environmental Monitoring, Environmental Sciences, Environmental Studies, Fresh Water Studies, Geochemistry, Geographic Information Sciences, Geography, Geology, Geomorphology, Geophysics and Seismology, Glaciology, Higher Education, Human Geography, Hydrology, Life Sciences, Meteorology, Mineral Physics, Natural Resource Economics, Natural Resources and Conservation, Natural Resources Management and Policy, Nature and Society Relations, Oceanography, Oceanography and Atmospheric Sciences and Meteorology, Oil, Gas, and Energy, Other Earth Sciences, Other Environmental Sciences, Other Geography, Other Oceanography and Atmospheric Sciences and Meteorology, Other Planetary Sciences, Outdoor Education, Paleobiology, Paleontology, Physical and Environmental Geography, Physical Sciences and Mathematics, Planetary Biogeochemistry, Planetary Geochemistry, Planetary Geology, Planetary Geomorphology, Planetary Geophysics and Seismology, Planetary Glaciology, Planetary Hydrology, Planetary Mineral Physics, Planetary Sciences, Planetary Sedimentology, Remote Sensing, Sedimentology, Social and Behavioral Sciences, Soil Science, Spatial Science, Speleology, Stratigraphy, Sustainability, Tectonics and Structure, Volcanology, Water Resource Management

Ensuring taught fieldwork is a positive, generative, collective, and valuable experience for all participants requires considerations beyond course content. To guarantee safety and belonging, participants’ identities (backgrounds and protected characteristics) must be considered as a part of fieldwork planning and implementation. Furthermore, getting fieldwork right is an important step in [...]

Combining shallow-water and analytical wake models for tidal array micro-siting

Connor Jordan, Davor Dundovic, Anastasia Fragkou, et al.

Published: 2021-07-30
Subjects: Civil and Environmental Engineering, Civil Engineering, Engineering, Hydraulic Engineering, Oceanography

For tidal-stream energy to become a competitive renewable energy source, clustering multiple turbines into arrays is paramount. As a result, array optimisation is critical for achieving maximum power performance and reducing cost of energy. However, ascertaining an optimal array layout is a highly complex problem, subject to specific site hydrodynamics and multiple inter-disciplinary [...]

Creating a climate changed future with the sea level rise interactive- fiction game ‘Lagos2199’

Patrick W Keys, Matthew P Keys

Published: 2021-07-27
Subjects: Climate, Education, Environmental Education, Environmental Sciences, Environmental Studies, Geographic Information Sciences, Geography, Instructional Media Design, International and Area Studies, Nature and Society Relations, Oceanography, Oceanography and Atmospheric Sciences and Meteorology, Other Earth Sciences, Other Environmental Sciences, Physical and Environmental Geography, Physical Sciences and Mathematics, Science and Mathematics Education, Sustainability

Story-based futures serve an important role in climate change scenario development. Stories are particularly useful in exploring sea level rise possibilities, since we know many coastal areas are specifically vulnerable to accelerating rises in sea level. This discrete change in coastline is different from most other climate change impacts, and offers a clear basis for scientifically-informed, [...]

Energetics and mixing of stratified, rotating flow over abyssal hills

Varvara E Zemskova, Nicolas Grisouard

Published: 2021-07-12
Subjects: Earth Sciences, Oceanography, Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics

One of the proposed mechanisms for energy loss in the ocean is through dissipation of internal waves, in particular above rough topography where internal lee waves are generated. Rates of dissipation and diapycnal mixing are often estimated using linear theory and a constant value for mixing efficiency. However, previous oceanographic measurements found that non-linear dynamics may be important [...]

OpenOBS: Open-source, low-cost optical backscatter sensors for water quality and sediment-transport research

Emily Eidam, Theodore Langhorst, Evan B Goldstein, et al.

Published: 2021-06-17
Subjects: Environmental Monitoring, Fluid Dynamics, Fresh Water Studies, Geomorphology, Oceanography, Sedimentology, Water Resource Management

Optical backscatter sensors (OBSs) are commonly used to measure the turbidity, or light obscuration, of water in fresh and marine environments and various industrial applications. These turbidity measurements are commonly calibrated to yield total suspended solids (TSS) or suspended sediment concentration (SSC) measurements for water quality, sediment transport, and diverse other research and [...]

Matchup Characteristics of Sea Surface Salinity using a High-resolution Ocean Model

Frederick M Bingham, Severine Fournier, Susannah Brodnitz, et al.

Published: 2021-06-16
Subjects: Oceanography

Sea surface salinity (SSS) satellite measurements are validated using in situ observations usually made by surfacing Argo floats. Validation statistics are computed using matched values of SSS from satellites and floats. This study explores how the matchup process is done using a high-resolution numerical ocean model, the MITgcm. One year of model output is sampled as if the Aquarius and Soil [...]

Ubiquity of human-induced changes in climate variability

Keith Bradley Rodgers, Sun-Seon Lee, Nan Rosenbloom, et al.

Published: 2021-06-12
Subjects: Atmospheric Sciences, Biogeochemistry, Climate, Earth Sciences, Oceanography, Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics

While climate change mitigation targets necessarily concern maximum mean state changes, understanding impacts and developing adaptation strategies will be largely contingent on how climate variability responds to increasing anthropogenic perturbations. Here we present a new 100-member large ensemble of climate change projections conducted with the Community Earth System Model version 2 to examine [...]

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