Filtering by Subject: Oceanography

In-ice measurements of full spectral angular radiance distribution using a 360-degree camera

Raphaël Larouche, Bastian Raulier, Christian Katlein, et al.

Published: 2023-05-18
Subjects: Oceanography, Oceanography and Atmospheric Sciences and Meteorology, Optics, Physics

A better understanding of the radiative transfer of solar visible light within sea ice is crucial to study the Arctic energy balance and marine ecosystems. In this work, we showcase the utilization of a compact, consumer-grade 360-degree camera for measuring the in-ice spectral angular radiance distribution. This novel technique allows for the instantaneous acquisition of all radiometric [...]

Different mechanisms of Arctic first-year sea-ice ridge consolidation observed during the MOSAiC expedition

Evgenii Salganik, Benjamin Allen Lange, Polona Itkin, et al.

Published: 2023-05-10
Subjects: Earth Sciences, Glaciology, Oceanography, Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics

Sea-ice ridges constitute a large fraction of the ice volume in the Arctic Ocean, yet we know little about the evolution of these ice masses. Here we examine the thermal and morphological evolution of an Arctic first-year sea-ice ridge, from its formation to advanced melt. Initially the mean keel depth was 5.6 m and mean sail height was 0.7 m. The initial rubble macroporosity (fraction of [...]

A cost model for ocean iron fertilization as a means of carbon dioxide removal that compares ship- and aerial-based delivery, and estimates verification costs.

David Emerson, Alexander B Michaud, Stephen D. Archer, et al.

Published: 2023-04-15
Subjects: Oceanography

This paper presents a cost model for implementing a deployment scale effort for conducting ocean iron fertilization (OIF) for marine-based carbon dioxide removal (CDR). The model incorporates basic oceanographic parameters critical for estimating the effective export of newly fixed CO2 into biomass that is stimulated by Fe addition to an Fe-limited region of the Southern Ocean. Estimated costs [...]

Efficient modeling of wave generation and propagation in a semi-enclosed estuary

Sean Christopher Hunter Crosby, Kees Nederhoff, Nathan VanArendonk, et al.

Published: 2023-03-15
Subjects: Oceanography, Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics

Accurate, and high-resolution wave statistics are critical for regional hazard mapping and planning. However, long-term simulations at high spatial resolution are often computationally prohibitive. Here, multiple rapid frameworks including fetch-limited, look-up-table (LUT), and linear propagation are combined and tested in a large estuary exposed to both remotely (swell) and locally generated [...]

Relative contributions of water level components to extreme water levels along the United States Southeast Atlantic Coast from a regional-scale water level hindcast

Kai Parker, Li Erikson, Jennifer Thomas, et al.

Published: 2023-03-13
Subjects: Oceanography

A 38-year hindcast water level product is developed for the United States Southeast Atlantic coastline from the entrance of Chesapeake Bay to the southeast tip of Florida. The water level modelling framework utilized in this study combines a global-scale hydrodynamic model (Global Tide and Surge Model, GTSM-ERA5), a novel ensemble-based tide model, a parameterized wave setup model, and [...]

A new, global optical sediment trap calibration

Margaret Estapa, Colleen Durkin, Wayne Slade, et al.

Published: 2023-02-26
Subjects: Oceanography

Autonomous sensors for gravitational carbon flux in the ocean are critically needed, because of uncertainties in the projected response of the biological carbon pump (BCP) to climate change, and the proposed, engineered acceleration of the BCP to sequester carbon dioxide in the ocean. Optical sediment trap (OST) sensors directly sense fluxes of sinking particles in a manner that is independent [...]

An Updated Parametrization of Algorithms to Retrieve the Diffuse Attenuation of Light in the Ocean from Remote Sensing and its Impact on Estimates of Net Primary Productivity

Charlotte Begouen Demeaux, Emmanuel Boss, Toby K. Westberry

Published: 2023-02-10
Subjects: Climate, Oceanography, Oceanography and Atmospheric Sciences and Meteorology, Oil, Gas, and Energy, Other Environmental Sciences

We recently found a significant bias while validating frequently used ocean color algorithms retrieving the spectral diffuse attenuation coefficient (Kd(λ))(Begouen and Boss, 2022). Here we modify existing algorithms for Kd(λ) to remove the observed bias at Kd(490), and evaluate the impact on global and regional estimates of net primary production (NPP) using two different primary production [...]

Sand Shoal Dynamics of a Tide-Dominated Estuarine Embayment: Comparison of a Numerical Sediment Transport Model against Field Observations

Ben Williams, Lex Nielsen, Will Glamore, et al.

Published: 2023-02-07
Subjects: Engineering, Environmental Engineering, Oceanography

This paper presents an innovative and detailed dataset of currents and sediment transport observations over a sand shoal system responsible for focusing wave energy on eroding coastline. The data are used to measure the performance of a detailed numerical sediment transport model of the sand shoal system. The predictive skill of the model is 0.96 for tidal elevations within Port Phillip Bay, 0.75 [...]

Internal gravity waves generated by subglacial discharge: implications for tidewater glacier melt

Jesse M Cusack, Rebecca H Jackson, Jonathan D Nash, et al.

Published: 2023-02-03
Subjects: Climate, Oceanography

Submarine melting has been implicated in the accelerated retreat of marine-terminating glaciers globally. Energetic ocean flows, such as subglacial discharge plumes, are known to enhance submarine melting in their immediate vicinity. Using observations and a large eddy simulation, we demonstrate that discharge plumes emit high-frequency internal gravity waves that propagate along glacier termini [...]

How fine is fine enough? Effect of mesh resolution on hydrodynamic simulations in coral reef environments

Antoine Saint-Amand, Jonathan Lambrechts, Christopher J. Thomas, et al.

Published: 2023-01-14
Subjects: Oceanography, Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics

Coral reef environments are biodiversity hotspots that provide many services to coastal communities. They are currently facing an increasing anthropogenic pressure that jeopardises their survival. Numerical ocean models are an important tool to understand the functioning of coral ecosystems and the mechanisms ensuring their resilience. However, simulating the water circulation through reef [...]

Improving Shoreline Forecasting Models with Multi-Objective Genetic Programming

Mahmoud Al Najar, Rafael Almar, Erwin W. J. Bergsma, et al.

Published: 2023-01-11
Subjects: Artificial Intelligence and Robotics, Climate, Environmental Engineering, Environmental Monitoring, Geomorphology, Hydrology, Numerical Analysis and Scientific Computing, Oceanography, Sedimentology, Statistical Models

Given the current context of climate change and the increasing population densities at coastal zones around the globe, there is an increasing need to be able to predict the development of our coasts. Recent advances in artificial intelligence allow for automatic analysis of observational data. Symbolic Regression (SR) is a type of Machine Learning algorithm that aims to find interpretable [...]

Weakening of the Indian Ocean Dipole in the mid-Holocene due to the mean oceanic climatology change

Shanshan Liu, Chaoxia Yuan, Jing-jia Luo, et al.

Published: 2023-01-11
Subjects: Atmospheric Sciences, Climate, Meteorology, Oceanography

The Indian Ocean Dipole (IOD) is one of the leading modes of interannual climate variability in the tropical Indian Ocean (IO). Paleoclimate provides real climate scenarios to examine IOD behaviors and the linkage to basic states. Based on 18 models from the Paleoclimate Modelling Intercomparison Project phase 3 and 4 (PMIP 3/4), the IOD change from the preindustrial period to mid-Holocene is [...]

Historical & future maximum ocean temperatures

B. B. Cael, Friedrich Burger, Gregory Britten, et al.

Published: 2022-12-17
Subjects: Oceanography

Marine heatwaves impact ocean ecosystems and are expected to become more frequent and intense with continued global warming. The ability of Earth system models to reproduce the statistical characteristics of extreme ocean temperatures has not yet been tested quantitatively, making the reliability of their future projections of marine heatwaves uncertain. We demonstrate that annual maxima of [...]

Extracting information from ocean color

B. B. Cael, Kelsey Bisson, Emmanuel Boss, et al.

Published: 2022-12-09
Subjects: Oceanography, Other Oceanography and Atmospheric Sciences and Meteorology

Products derived from remote sensing reflectances ($R_{rs}(\lambda)$), e.g. chlorophyll, phytoplankton carbon, euphotic depth, or particle size, are widely used in oceanography. Problematically, $R_{rs}(\lambda)$ may have fewer degrees of freedom (DoF) than measured wavebands or derived products. A global sea surface hyperspectral $R_{rs}(\lambda)$ dataset has DoF=4. MODIS-like multispectral [...]

Global climate change trends detected in indicators of ocean ecology

B. B. Cael, Kelsey Bisson, Emmanuel Boss, et al.

Published: 2022-12-07
Subjects: Oceanography

Climate change-driven trends in phytoplankton populations, as viewed by Earth-observing satellites, were thought to be masked by strong natural variability, so that >30 years of continuous data was needed to detect a climate trend. Here we show that climate change trends emerge more rapidly in ocean color (remote sensing reflectance, Rrs), as Rrs is multivariate and some wavebands have low [...]


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