Preprints

Filtering by Subject: Oceanography

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: 2024-02-16
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 (2019-2020): An interdisciplinary perspective on 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 the 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 [...]

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 [...]

Unsupervised clustering identifies thermohaline staircases in the Canada Basin of the Arctic Ocean

Mikhail Schee, Erica Rosenblum, Jonathan Lilly, et al.

Published: 2023-07-28
Subjects: Oceanography, Oceanography and Atmospheric Sciences and Meteorology, Physical Sciences and Mathematics

Thermohaline staircases are a widespread stratification feature that impact the vertical transport of heat and nutrients and are consistently observed throughout the Canada Basin of the Arctic Ocean. Observations of staircases from the same time period and geographic region form clusters in temperature-salinity ($T$--$S$) space. Here, for the first time, we use an automated clustering algorithm [...]

Evaluating Climate Signals on Global Coastal Shoreline Positions A commentary on “Influence of El Niño on the variability of global shoreline position” by Almar and colleagues.

Jonathan Warrick, Daniel Buscombe, Kilian Vos, et al.

Published: 2023-07-26
Subjects: Climate, Geomorphology, Oceanography, Other Earth Sciences, Other Environmental Sciences

Almar and colleagues (2023) are correct in stating that, “understanding and predicting shoreline evolution is of great importance for coastal management.” Amongst the different timescales of shoreline change, the interannual and decadal timescales are of particular interest to coastal scientists as they reflect the integrated system response to the Earth’s climate and its natural modes of [...]

Last Glacial Maximum pattern effects reduce climate sensitivity estimates

Vincent T. Cooper, Kyle C. Armour, Greg Hakim, et al.

Published: 2023-07-14
Subjects: Atmospheric Sciences, Climate, Oceanography, Oceanography and Atmospheric Sciences and Meteorology

Here we show that the Last Glacial Maximum (LGM) provides a strong constraint on equilibrium climate sensitivity (ECS), the global-mean warming from increasing greenhouse-gas concentrations, after temperature patterns are accounted for. Feedbacks governing ECS depend on spatial patterns of surface temperature (“pattern effects”), hence using the LGM to constrain future warming requires [...]

Satellite-derived shorelines for monitoring of sandy beaches: a benchmark study

Kilian Vos, Kristen D Splinter, Jesús Palomar-Vázquez, et al.

Published: 2023-07-09
Subjects: Civil and Environmental Engineering, Earth Sciences, Engineering, Environmental Engineering, Geomorphology, Oceanography, Oceanography and Atmospheric Sciences and Meteorology, Other Earth Sciences, Physical Sciences and Mathematics

Satellite remote sensing is becoming a widely used monitoring technique in coastal sciences. Yet, no benchmarking studies exist that compare the performance of popular satellite-derived shoreline (SDS) mapping algorithms against standardized sets of inputs and validation data. Here we present a new benchmarking framework to evaluate the accuracy of shoreline change observations extracted from [...]

Seismic Stratigraphy of Contourite Drift Deposits Associated with the Loop Current on the Eastern Campeche Bank, Gulf of Mexico

Christopher Michael Lowery, Ligia Perez Cruz, Jaime Urrutia Fucugauchi, et al.

Published: 2023-06-08
Subjects: Geophysics and Seismology, Oceanography, Sedimentology, Stratigraphy

The Loop Current is a key component of global circulation via the northward transport of warm, salty water and an important influence on Gulf of Mexico hydrography. Understanding how the Loop Current will respond to ongoing anthropogenic warming is critically important, but the history of the Loop Current is poorly known. Here, we present the results of a high resolution (3-8 m) multichannel [...]

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