Filtering by Subject: Oceanography

The Overlooked Sub-Grid Air-Sea Flux in Climate Models

Julius Busecke, Dhruv Balwada, Paige Martin`, et al.

Published: 2024-05-18
Subjects: Atmospheric Sciences, Climate, Numerical Analysis and Scientific Computing, Oceanography

Understanding air-sea interaction is crucial for our ability to predict future states of the climate system, and to inform economic and societal decision-making. However, the representation of air-sea interactions in climate models is limited by structural errors associated with model resolution. Coarse-resolution climate models do not resolve small-scale structures in the air-sea state, which, [...]

Unique In-situ Measurements from Greenland Fjord Show Winter Freshening by Subglacial Melt

Karina Hansen, Nanna B Karlsson, Penelope How, et al.

Published: 2024-05-08
Subjects: Earth Sciences, Glaciology, Oceanography, Oceanography and Atmospheric Sciences and Meteorology, Other Earth Sciences, Physical Sciences and Mathematics

The interaction between glacier fronts and ocean waters is one of the key uncertainties for projecting future ice mass loss. Direct observations at glacier fronts are sparse but studies indicate that the magnitude and timing of freshwater fluxes are crucial in determining fjord circulation, ice frontal melt and ecosystem habitability. Particularly wintertime dynamics are severely understudied due [...]

SWOT Data Assimilation with Correlated Error Reduction: Fitting Model and Error Together

Yu Gao, Sarah T. Gille, Bruce D. Cornuelle, et al.

Published: 2024-05-01
Subjects: Oceanography, Oceanography and Atmospheric Sciences and Meteorology

The Surface Water Ocean Topography (SWOT) satellite mission provides high-resolution two-dimensional sea surface height (SSH) data with swath coverage. However, spatially correlated errors affect these SSH measurements, particularly in the cross-track direction. The scales of errors can be similar to the scales of ocean features. Conventionally, instrumental errors and ocean signals have been [...]

Numerical simulation of the 2D trajectory of a non-buoyant fluid parcel under the influence of inertial oscillation

Sandy Hardian Susanto Herho, Iwan Pramesti Anwar, Katarina Evelyn Permata Herho, et al.

Published: 2024-04-24
Subjects: Atmospheric Sciences, Fluid Dynamics, Numerical Analysis and Computation, Numerical Analysis and Scientific Computing, Oceanography

The trajectory of non-buoyant fluid parcels under the influence of inertial oscillations is a pivotal phenomenon in geophysical fluid dynamics, impacting processes such as tracer transport, pollutant dispersion, and the dynamics of marine organisms. This study presents a comprehensive numerical investigation of the two-dimensional trajectory of a non-buoyant fluid parcel subjected to inertial [...]

Dynamics of Aggregates and Sinking Carbon Fluxes in a Turbulent Ocean

David Siegel, Adrian Burd, Margaret Estapa, et al.

Published: 2024-04-23
Subjects: Oceanography, Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics

The ocean's biological pump, a critical component of the Earth's carbon cycle, transports organic matter from the surface ocean to depth, which is dominated by the sinking particles, often in the form of large (>1 mm) marine snow aggregates. Controls on carbon export are thought to be driven solely by ecological processes that produce and repackage sinking particles. Here, we present [...]

Seasonality of spectral radiative fluxes and optical properties of Arctic sea ice during the spring-summer transition

Ran Tao, Marcel Nicolaus, Christian Katlein, et al.

Published: 2024-02-15
Subjects: Oceanography, Oceanography and Atmospheric Sciences and Meteorology

The reflection, absorption, and transmittance of solar (shortwave) radiation by sea ice play a crucial role in physical and biological processes in the ice-covered Arctic Ocean and atmosphere. These sea ice optical properties are of great importance, in particular during the melt season, as they significantly impact energy fluxes within and the total energy budget of the coupled [...]

Year-long benthic measurements of environmental conditions indicate high sponge biomass is related to strong bottom currents over the Northern Labrador shelf

Evert de Froe, Igor Yashayaev, Christian Mohn, et al.

Published: 2024-01-22
Subjects: Marine Biology, Oceanography, Other Oceanography and Atmospheric Sciences and Meteorology

Deep-sea sponge grounds are distributed globally and are considered hotspots of biological diversity and biogeochemical cycling. To date, little is known about the environmental constraints that control where deep-sea sponge grounds occur and what conditions allow high sponge biomass to develop in the deep sea. Here, we characterize oceanographic conditions at two contrasting high- and [...]

Role of Indonesian Archipelago on Global Thermohaline Circulation: Insights from Numerical Experiments

Sandy Hardian Susanto Herho, Iwan Pramesti Anwar, Gisma Aminurah Firdaus, et al.

Published: 2023-12-18
Subjects: Numerical Analysis and Scientific Computing, Oceanography, Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics

This study employs the cGENIE Earth System Model to investigate the effects of the Indonesian Throughflow (ITF) and Indonesian Archipelago (IA) closure on global meridional thermohaline circulation (THC). Over a simulated period of 10,000 years, the analysis centers on critical variables, including surface density, vertical density profiles, global overturning circulation, and ocean ventilation [...]

Overview of the MOSAiC expedition: Ecosystem

Allison A. Fong, Clara Jule Marie Hoppe, ECO Team, et al.

Published: 2023-12-08
Subjects: Marine Biology, Oceanography

An international and interdisciplinary sea ice drift expedition, the ‘The Multidisciplinary drifting Observatory for the Study of Arctic Climate‘ (MOSAiC), was conducted from October 2019 to September 2020. The aim of MOSAiC was to study the interconnected physical, chemical and biological characteristics and processes from the atmosphere to the deep sea of the central Arctic system. The [...]

A study of extreme water waves using a hierarchy of models based on potential-flow theory

Junho Choi, Anna Kalogirou, Mark Kelmanson, et al.

Published: 2023-12-02
Subjects: Applied Mathematics, Oceanography, Oceanography and Atmospheric Sciences and Meteorology, Partial Differential Equations, Physical Sciences and Mathematics

The formation of extreme waves arising from the interaction of three line-solitons with equal far-field amplitudes is examined through a hierarchy of water-wave models. The Kadomtsev-Petviashvili equation (KPE) is first used to prove analytically that its exact three-soliton solution has a ninefold maximum amplification that is achieved in the absence of spatial divergence. Reproducing this [...]

Towards parameterizing eddy-mediated transport of Warm Deep Water across the Weddell Sea continental slope

Nicolas Dettling, Martin Losch, Friederike Pollmann, et al.

Published: 2023-11-23
Subjects: Oceanography, Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics

The transport of Warm Deep Water (WDW) onto the Weddell Sea continental shelf is associated with a heat flux and strongly contributes to the melting of Antarctic ice shelves. The small radius of deformation at high latitudes makes it difficult to accurately represent the eddy-driven component of onshore WDW transport in coarse-resolution ocean models so that a parameterization becomes necessary. [...]

Mesoscale Eddy-Induced Sharpening of Oceanic Tracer Fronts and its Parameterization

Yueyang Lu, Igor Kamenkovich

Published: 2023-11-04
Subjects: Oceanography

Oceanic fronts are ubiquitous and important features that form and evolve due to multiscale oceanic and atmospheric processes. For example, large-scale temperature and tracer fronts along the eastward extensions of the Gulf Stream and Kuroshio currents play key roles in the regional ocean environment and climate. The fronts cannot be realistically simulated by numerical models at spatial [...]

Pacific shoreline erosion and accretion patterns controlled by El Niño/Southern Oscillation

Kilian Vos, Mitchell Dean Harley, Ian L Turner, et al.

Published: 2023-10-27
Subjects: Civil and Environmental Engineering, Climate, Earth Sciences, Engineering, Environmental Monitoring, Environmental Sciences, Geomorphology, Oceanography, Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics

In the Pacific Basin, the El Niño/Southern Oscillation (ENSO) is the dominant mode of interannual climate variability, driving substantial changes in oceanographic forcing and impacting Pacific coastlines. Yet, how sandy coasts respond to these basin-scale changes has to date been limited to a few long-term beach monitoring sites, predominantly on developed coasts. Here we use 38 years of Landsat [...]

The Eurasian Arctic Ocean along the MOSAiC drift in 2019-2020: An interdisciplinary perspective on physical properties and processes

Kirstin Schulz, Zoe Koenig, Morven Muilwijk, et al.

Published: 2023-09-07
Subjects: Oceanography

The Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC, 2019--2020), a year-long drift with the Arctic sea ice, has provided the scientific community with an unprecedented, multidisciplinary dataset from the Eurasian Arctic Ocean, covering high atmosphere to deep ocean across all seasons. However, the heterogeneity of data and the superposition of spatial and temporal [...]

Marine zooplankton acclimated to geological warming but face limits by the next century

Rui Ying, Fanny M. Monteiro, Jamie D. Wilson, et al.

Published: 2023-08-06
Subjects: Climate, Oceanography

Climate changes have threatened marine organisms causing migrations, biomass reduction and extinctions. However, the capacity of marine species to adapt or acclimate to these changes remains poorly constrained in both geological and anthropogenic timescales. Such uncertainty makes modelling past and future ocean biodiversity and ecosystem functions challenging, particularly for the plankton [...]


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