Article
Ecology
Charlotte L. Spencer-Jones, Erin L. McClymont, Nicole J. Bale, Ellen C. Hopmans, Stefan Schouten, Juliane Muller, E. Povl Abrahamsen, Claire Allen, Torsten Bickert, Claus-Dieter Hillenbrand, Elaine Mawbey, Victoria Peck, Aleksandra Svalova, James A. Smith
Summary: The West Antarctic Ice Sheet is a significant potential source of future sea-level rise, with glaciers thinning at an accelerating rate. Studies show that archaeal lipid-based proxies can be used to reconstruct ocean temperature, but there are difficulties in applying these proxies in the Southern Ocean. A greater understanding of the parameters influencing Southern Ocean GDGT distributions would improve the application of biomarker proxies and give a longer-term perspective on Antarctic ice sheet changes.
Article
Oceanography
Maciej Janecki, Dawid Dybowski, Daniel Rak, Lidia Dzierzbicka-Glowacka
Summary: This paper introduces a new method for finding the depth of thermocline and halocline, and it has significant applications in shallow marine basins globally. The method utilizes the short-scale spatial variability of ocean vertical profile to calculate the moving average and determine the potential depth of rapid temperature or salinity changes. The accuracy of the method is confirmed through calibration and validation.
JOURNAL OF PHYSICAL OCEANOGRAPHY
(2022)
Article
Multidisciplinary Sciences
Stefan Huck, Ulrich Heimhofer
Summary: By analyzing sclerochemical profiles of pristine rudist bivalve shells from Tethyan and proto-North Atlantic shallow water carbonate platforms, it was found that the Barremian and Aptian regions had moderate mean annual SSTs ranging from 22-26 degrees Celsius, with occasional warm pulses during the Mid-Barremian Event and Oceanic Anoxic Event 1a. The positive shift in oxygen-isotope values at the Barremian-Aptian boundary suggests a significant net loss of O-16 in Tethyan shallow-marine settings, indicating a major cooling phase and potential sea-level lowering. These new findings contrast open ocean SST records based on TEX86, which show exceptionally warm Barremian to earliest Aptian subtropical oceans and weak meridional SST gradients.
SCIENTIFIC REPORTS
(2021)
Article
Environmental Sciences
Atsushi Ooki, Keita Minamikawa, Fanxing Meng, Naoya Miyashita, Toru Hirawake, Hiromichi Ueno, Yuichi Nosaka, Tetsuya Takatsu
Summary: Elevated methyl and ethyl iodide concentrations in bottom waters may be linked to diatom aggregates and phytodetritus settling to the sea floor. Dark incubation experiments suggest that diatom aggregates are a source of methyl and ethyl iodide to the ambient water. These findings reveal that phytodetritus at the seafloor is a potential source of volatile organic iodine compounds in polar and subpolar coastal oceans.
COMMUNICATIONS EARTH & ENVIRONMENT
(2022)
Article
Meteorology & Atmospheric Sciences
Kristin N. Barton, Nairita Pal, Steven R. Brus, Mark R. Petersen, Brian K. Arbic, Darren Engwirda, Andrew F. Roberts, Joannes J. Westerink, Damrongsak Wirasaet, Michael Schindelegger
Summary: In this study, we used the barotropic version of the Model for Prediction Across Scales (MPAS-Ocean) to examine ocean tides and investigate factors affecting tidal accuracy. We compared different methods of calculating self-attraction and loading (SAL), different model resolutions, details of bathymetry, and parameterized topographic wave drag. We also compared the performance of different resolution meshes and found that a variable resolution mesh obtained the best accuracy for deep ocean M2 tide. In future work, we plan to use MPAS-Ocean to study tidal interactions with other Earth system components and the response of tides to climate change.
JOURNAL OF ADVANCES IN MODELING EARTH SYSTEMS
(2022)
Article
Geosciences, Multidisciplinary
William J. Pringle, Damrongsak Wirasaet, Keith J. Roberts, Joannes J. Westerink
Summary: This paper details numerical improvements made to the ADCIRC model for more accurate and efficient global storm tide simulations, with a focus on seamless local mesh refinement. The study demonstrates the importance of refining resolution based on topographic seabed gradients and utilizing a global mesh design with a small MinEle for accurate results. The new numerical treatment significantly improves computational performance compared to previous versions of ADCIRC, allowing for larger time steps and faster simulations.
GEOSCIENTIFIC MODEL DEVELOPMENT
(2021)
Article
Environmental Sciences
Vladimir Kudryavtsev, Anastasiia Stokoz, Kirill Khvorostovsky
Summary: In this study, the sea surface height anomalies caused by polar lows in the Barents Sea were investigated using satellite altimeter measurements and model simulations. The observed anomalies were shaped like troughs with the lowest height at the center of the polar lows and were well distinguished within one day after the passage. A simplified model successfully reproduced the observed anomalies along most satellite altimeter tracks.
Article
Marine & Freshwater Biology
Catarina Vinagre, Diana Madeira, Vanessa Mendonca, Carolina Madeira, Mario S. Diniz
Summary: The study investigated the seasonal response of stress biomarkers in a common tide pool fish, the blenny Lipophrys trigloides, under natural conditions. The results showed that L. trigloides seems to be activating thermal stress and antioxidant defenses under summer conditions. All tissues analysed were responsive to thermal and oxidative stress, with the exception of SOD, indicating potential future implications for climate warming.
ESTUARINE COASTAL AND SHELF SCIENCE
(2021)
Article
Environmental Sciences
Do-Seong Byun, Byoung-Ju Choi, Deirdre Erin Hart
Summary: The availability of ocean data is driving the development of new regional and coastal ocean models and operating systems. This article presents solutions for three tide-related technical challenges in ocean modeling, including automatic generation of tidal harmonic forcings from tidal constant databases, perpetual generation of interannual tidal predictions, and production of ocean model harmonic constant forcing data using tide models. The provided code allows for continuous multi-decadal simulations and helps researchers avoid tide-related errors in establishing ocean models.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Physics, Multidisciplinary
Chao Xiao, Fei He, Quanqi Shi, Wenlong Liu, Anmin Tian, Ruilong Guo, Chao Yue, Xuzhi Zhou, Yong Wei, I. Jonathan Rae, Alexander W. Degeling, Vassilis Angelopoulos, Emmanuel V. Masongsong, Ji Liu, Qiugang Zong, Suiyan Fu, Zuyin Pu, Xiaoxin Zhang, Tieyan Wang, Huizi Wang, Zhao Zhang
Summary: Multisatellite observations have shown that lunar tides affect Earth's oceans, geomagnetic field, and now it has been discovered that they also impact the plasmasphere. The study analyzed variations in the plasmasphere's boundary over the past four decades and found evidence of a lunar tide-induced signal. This signal has distinct diurnal and monthly periodicities, different from previously observed lunar tide effects in other regions.
Article
Multidisciplinary Sciences
Chengyuan Pang, Maxim Nikurashin, Beatriz Pena-Molino, Bernadette M. Sloyan
Summary: In addition to local tidal mixing, remotely generated planetary waves and eddies also contribute to the mixing in the upper ocean of the Indonesian Seas. The intense mixing observed in this region plays a crucial role in the climate of the Indonesian Seas by cooling the surface temperature and affecting atmospheric convection. The energy generated in the Indian and Pacific Oceans is transported to the Indonesian Seas by planetary waves and eddies, and it is estimated that a significant amount of energy enters the region through the straits.
NATURE COMMUNICATIONS
(2022)
Article
Environmental Sciences
Yaling Huang, Weiwei Zhang, Shoufeng Zhang, Fei Jin, Chao Fang, Xindong Ma, Juying Wang, Jingli Mu
Summary: This study investigates the spatial distribution and composition of microplastics in near-surface water from the East Asian Seas to the Arctic Central Basin. Results show that microplastics were detected in 93.9% of the sampling sites, with abundances ranging from 0.48 to 7.62 items/m³. Polyester (PET) was found to be the dominant type, accounting for 71.3% of the total microplastics.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Geochemistry & Geophysics
Samurdhika Rathnayake, Robert Tenzer, Wenjin Chen, Mehdi Eshagh, Martin Pitonak
Summary: This study compares different isostatic and gravimetric methods for recovering the Moho depth under the oceanic crust and continental margins, with results indicating that the VMM model is likely the most suitable method considering lithospheric mantle density information. The Airy method tends to overestimate the Moho depth under oceanic volcanic formations.
SURVEYS IN GEOPHYSICS
(2021)
Article
History & Philosophy Of Science
Christopher L. Pastore
Summary: This essay examines the efforts to create oceanic natural knowledge in shallow waters, focusing on how natural historians in the seventeenth and early eighteenth centuries built a nascent science of the sea by documenting the legends and experiences of people who worked and lived by the ocean. By studying sea beans and barnacle geese, the essay shows how shallow waters welcomed new actors onto the scientific stage, advancing contemporary knowledge of oceanic circulation.
Review
Environmental Sciences
Martin Jakobsson, Larry A. Mayer
Summary: The interaction between the ocean, cryosphere, and seafloor is vital for understanding processes such as deep ocean mixing, glacier dynamics, and sea-level rise. However, there is a critical knowledge gap in accurately mapping the seafloor in Polar regions, which needs to be addressed to improve predictions and understanding of these processes.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Engineering, Aerospace
Vegard Ophaug, Kristian Breili, Ole Baltazar Andersen
Summary: The study determines a coastal mean sea surface (MSS) for Norway using new-generation altimetry data and discusses the associated error field. Results show that the coastal MSS outperforms global MSS models directly at the coast, with similar standard deviations of differences compared to tide gauges. However, in areas like fjords, the formal error field quantifies large uncertainties due to the lack of altimetry observations.
ADVANCES IN SPACE RESEARCH
(2021)
Article
Engineering, Aerospace
Tadea Veng, Ole B. Andersen
Summary: This study extends the analysis of global mean sea level changes by including independent data from ESA missions, providing a more comprehensive and accurate understanding compared to previous studies using TPJ data. The results show similar patterns of sea level acceleration across the global ocean between ESA and TPJ datasets.
ADVANCES IN SPACE RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Hongkai Shi, Xiufeng He, Yihao Wu, Ole Baltazar Andersen, Per Knudsen, Yanxiong Liu, Zhetao Zhang
Summary: The study proposes a least squares-based approach to model mean dynamic topography signal, which performs better in recovering current signal compared to traditional isotropic filtering methods. Error analysis indicates errors are primarily concentrated near coastal regions.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Environmental Sciences
Karina Nielsen, Elena Zakharova, Angelica Tarpanelli, Ole B. Andersen, Jerome Benveniste
Summary: Satellite altimetry is a key technique for measuring water level changes in continental water bodies. The simultaneous availability of multiple satellite altimetry missions presents an opportunity to obtain a more detailed understanding of the hydrological regime of rivers. However, combining water level data from different locations and satellites is challenging due to factors such as topography and intermission biases. This study proposes a new method to combine multi-mission altimetry-based water levels, allowing for a more accurate analysis of the hydrological regime.
REMOTE SENSING OF ENVIRONMENT
(2022)
Article
Environmental Sciences
Bjarke Nilsson, Ole Baltazar Andersen, Heidi Ranndal, Mikkel Lydholm Rasmussen
Summary: This paper utilizes the ICESat-2 satellite to observe ocean surface waves and compares the results with CryoSat-2 radar observations, demonstrating the agreement between these systems. The study finds a high correlation between the three ICESat-2 models and CryoSat-2 observations, indicating the potential of using ICESat-2 as an additional source of ocean data.
Article
Environmental Sciences
Qing Xu, Yizhi Li, Yongcun Cheng, Xiaomin Ye, Zenghai Zhang
Summary: The geographical and temporal variability of offshore wind resources in China Seas were investigated using the Cyclostationary Empirical Orthogonal Function (CSEOF) method. The study found that the annual cycle and El Nino Southern Oscillation (ENSO) had a significant impact on the variability of wind energy. Scatterometer winds demonstrated a higher spatial resolution and finer structure of wind energy variability compared to CFSR winds.
Article
Environmental Sciences
Peder Heiselberg, Kristian A. Sorensen, Henning Heiselberg, Ole B. Andersen
Summary: Maritime surveillance of the Arctic region is increasingly important, and this study successfully detects and classifies ships and icebergs using SAR satellite data. A large annotated dataset is constructed, and a new convolutional neural network achieves state-of-the-art performance.
Article
Geography, Physical
Guodong Chen, Zhijie Zhang, Stine Kildegaard Rose, Ole Baltazar Andersen, Shengjun Zhang, Taoyong Jin
Summary: This study constructed a new Arctic mean sea surface model, SUST22, by combining measurements from ICESat and CryoSat-2 missions, with modified lead detection methods for better accuracy in sea surface height measurement. Comparisons with other Arctic MSS models showed that SUST22 had better consistency with ICESat-2.
INTERNATIONAL JOURNAL OF DIGITAL EARTH
(2022)
Article
Environmental Sciences
Liguang Jiang, Yanan Zhao, Karina Nielsen, Ole B. Andersen, Peter Bauer-Gottwein
Summary: For applications that require water level estimates as soon as possible, near real-time (NRT) products are most suitable. The Sentinel-3 mission is capable of delivering NRT water levels within a few hours of observation. A three-year comparison study found that the NRT product is almost as accurate as the delayed product in mapping river water level variations globally.
ENVIRONMENTAL RESEARCH LETTERS
(2023)
Article
Environmental Sciences
Matea Tomic, Ole Baltazar Andersen
Summary: This study evaluates coastal observations from ICESat-2 to update the existing mean sea surface for Norway. The results show that ICESat-2 provides more accurate coastal observations, which can improve the mean sea surface model, especially along the coast.
Article
Environmental Sciences
Ole Baltazar Andersen, Stine Kildegaard Rose, Michael G. Hart-Davis
Summary: By analyzing the Cryosat-2 satellite data, the stability and accuracy of the physical retracker were demonstrated, leading to more reliable sea level estimates. The introduction of a novel empirical ocean tide model DTU22 specifically for polar regions showed improvements in tidal modeling, highlighting the significance of incorporating Cryosat-2 data.
Article
Environmental Sciences
Elodie Da Silva, Emma R. Woolliams, Nicolas Picot, Jean-Christophe Poisson, Henriette Skourup, Geir Moholdt, Sara Fleury, Sajedeh Behnia, Vincent Favier, Laurent Arnaud, Jeremie Aublanc, Valentin Fouqueau, Nicolas Taburet, Julien Renou, Herve Yesou, Angelica Tarpanelli, Stefania Camici, Renee Mie Fredensborg Hansen, Karina Nielsen, Frederic Vivier, Francois Boy, Roger Fjortoft, Mathilde Cancet, Ramiro Ferrari, Ghislain Picard, Mohammad J. Tourian, Nicolaas Sneeuw, Eric Munesa, Michel Calzas, Adrien Paris, Emmanuel Le Meur, Antoine Rabatel, Guillaume Valladeau, Pascal Bonnefond, Sylvie Labroue, Ole Andersen, Mahmoud El Hajj, Filomena Catapano, Pierre Femenias
Summary: The Copernicus Sentinel-3 Surface Topography Mission (STM) Land Altimetry provides valuable elevation information for inland waters, sea ice, and land ice. The St3TART project aims to generalize the concept of Fiducial Reference Measurements (FRMs) to validate the STM measurements. A roadmap for the operational provision of FRMs has been developed, including guidelines for SI traceability, definition of measurement procedures, processing methods, and uncertainty budget estimations.
Article
Chemistry, Multidisciplinary
Yidi Wei, Yongcun Cheng, Xiaobin Yin, Qing Xu, Jiangchen Ke, Xueding Li
Summary: Detailed information about mangroves is crucial for ecological and environmental protection and sustainable development. In this study, high-resolution satellite images were used to map the distribution of mangroves, and a deep-learning network, U-2-Net, was applied to extract multi-scale information. The results showed that the U-2-Net model performed well on mangrove classification, and the generated mangrove maps provided important information for monitoring dynamic changes.
APPLIED SCIENCES-BASEL
(2023)
Article
Geosciences, Multidisciplinary
Martin Horwath, Benjamin D. Gutknecht, Anny Cazenave, Hindumathi Kulaiappan Palanisamy, Florence Marti, Ben Marzeion, Frank Paul, Raymond Le Bris, Anna E. Hogg, Ines Otosaka, Andrew Shepherd, Petra Doell, Denise Caceres, Hannes Mueller Schmied, Johnny A. Johannessen, Jan Even Oie Nilsen, Roshin P. Raj, Rene Forsberg, Louise Sandberg Sorensen, Valentina R. Barletta, Sebastian B. Simonsen, Per Knudsen, Ole Baltazar Andersen, Heidi Ranndal, Stine K. Rose, Christopher J. Merchant, Claire R. Macintosh, Karina von Schuckmann, Kristin Novotny, Andreas Groh, Marco Restano, Jerome Benveniste
Summary: Studies on the global sea-level budget and ocean-mass budget are crucial for understanding the reliability of sea-level change and its contributors. In this study, datasets for the sea-level budget and ocean-mass budget were analyzed using a consistent framework of uncertainty characterization. The findings show that the sea-level rise trend aligns with the sum of the mass and steric components.
EARTH SYSTEM SCIENCE DATA
(2022)
Article
Meteorology & Atmospheric Sciences
Carsten Bjerre Ludwigsen, Ole Baltazar Andersen, Stine Kildegaard Rose
Summary: The aim of this study is to create a satellite-independent reconstruction of Arctic sea level trend (SLT) using fingerprints from glaciers, Greenland, Antarctica, and glacial isostatic adjustment (GIA), as well as interpolating temperature and salinity observations. The reconstructed SLT shows a dominating halosteric component and a smaller manometric component in the Arctic Ocean.