Article
Oceanography
Zachary K. Erickson, Erik Fields, Leah Johnson, Andrew F. Thompson, Lilian A. Dove, Eric D'Asaro, David A. Siegel
Summary: Mesoscale eddies are a significant source of spatial variability in the surface ocean and have a major impact on the marine carbon cycle. This study compares satellite altimetry measurements with in situ observations to validate the use of altimetry for locating and tracking eddies. The results show over 90% agreement between altimetry metrics and in situ estimates, indicating that current satellite altimetry is sufficiently accurate for understanding the spatial representation of mesoscale eddies, even relatively small ones.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Geosciences, Multidisciplinary
Maxime Ballarotta, Clement Ubelmann, Pierre Veillard, Pierre Prandi, Helene Etienne, Sandrine Mulet, Yannice Faugere, Gerald Dibarboure, Rosemary Morrow, Nicolas Picot
Summary: We introduce a new gridded dataset of sea surface height and current by combining observations from nadir altimeters and drifting buoys. The dataset, covering the global ocean from July 2016 to June 2020, utilizes a multiscale and multivariate mapping approach to improve the physical content of gridded products. The results demonstrate the promising potential of this approach in reconstructing the ocean surface circulation.
EARTH SYSTEM SCIENCE DATA
(2023)
Article
Environmental Sciences
Josue Martinez-Moreno, Andrew McC. Hogg, Matthew H. England, Navid C. Constantinou, Andrew E. Kiss, Adele K. Morrison
Summary: Studies have shown that mesoscale eddy variability has increased in eddy-rich regions but decreased in the tropical ocean over the past few decades. These changes have significant implications for the exchange of heat and carbon between the ocean and atmosphere.
NATURE CLIMATE CHANGE
(2021)
Article
Environmental Sciences
Jude L. Musuuza, Louise Crochemore, Ilias G. Pechlivanidis
Summary: Earth observations (EOs) are a valuable complement to in situ measurements in hydrology because they provide information in locations where direct measurements are unavailable or prohibitively expensive to make. Recent advances have enabled the assimilation of data sets of different physical variables into hydrological models to better estimate states and fluxes.
WATER RESOURCES RESEARCH
(2023)
Article
Engineering, Aerospace
V. S. Vuglinsky, J-F Cretaux, A. V. Izmailova, S. I. Gusev, M. Berge-Nguyen, B. Calmettes
Summary: Satellite radar altimetry has been developed for monitoring lake water levels, providing continuous and accurate data. However, the accuracy of water heights inferred from altimeters varies due to location, shape, size, and surrounding environment of the lakes. Ground observations of lake heights are needed to determine the accuracy of radar altimeters, but they are not directly comparable. This study presents an approach to compare water levels using a large lake, hydrological stations, and satellite measurements, aiming to assess the quality and errors of radar altimeters.
ADVANCES IN SPACE RESEARCH
(2023)
Article
Environmental Sciences
Gaston Manta, Sabrina Speich, Marcelo Barreiro, Romina Trinchin, Camila de Mello, Remi Laxenaire, Alberto R. Piola
Summary: The Brazil-Malvinas Confluence (BMC) is an energetic mesoscale region where opposing western boundary currents meet. Based on shipborne observations within the Uruguayan EEZ, satellite data, and an eddy tracking algorithm, this study analyzes the cross-shelf exchanges during an anomalous northern position of the BMC. The study reveals two types of shelf water export triggered by mesoscale dynamics - shallow Rio de la Plata Plume waters pushed off-shelf by the retroflection of the Brazil Current, and the subduction of Subantarctic Shelf Waters (SASW) that reach extreme depths.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Mounir Benkiran, Giovanni Ruggiero, Eric Greiner, Pierre-Yves Le Traon, Elisabeth Remy, Jean Michel Lellouche, Romain Bourdalle-Badie, Yann Drillet, Babette Tchonang
Summary: The text explains the future SWOT mission, which will extend the capabilities of existing nadir altimeters for two-dimensional mapping at higher resolution. It discusses the challenges of assimilating this data into high-resolution models, and presents updates to the Mercator Ocean data assimilation scheme to improve the assimilation of SWOT data. Additionally, the text describes the design and evaluation of Observing System Simulation Experiments (OSSEs) to assess the impact of SWOT on global analysis and forecasting systems.
FRONTIERS IN MARINE SCIENCE
(2021)
Article
Environmental Sciences
Wim Simons, Marc Naeije, Zaki Ghazali, Wan Darani Rahman, Sanusi Cob, Majid Kadir, Asrul Mustafar, Ami Hassan Din, Joni Efendi, Prakrit Noppradit
Summary: Absolute sea-level rise is an important global issue due to climate change, and the relative sea-level rise caused by vertical land motion in coastal areas can have significant societal impacts. This paper investigates the relative sea-level trends and temporal changes across Malaysia, using data from tide gauges and GNSS stations. The study also estimated the absolute sea level at these locations from satellite altimetry data. The combination of absolute sea level and vertical land motion was used to validate the relative sea-level rise and provide trend estimates.
Article
Engineering, Ocean
Qingqing Pan, Xueming Zhu, Liying Wan, Yun Li, Xiaodi Kuang, Jingui Liu, Han Yu
Summary: This article presents an operational oil spill forecasting system established by the National Marine Environmental Forecasting Center (NMEFC), which integrates satellite observations, oil spill models, and operational meteorological and oceanographic forecasts. The system was applied to a condensate and heavy fuel oil spill caused by a collision involving the Sanchi oil tanker in the East China Sea in 2018. Emergency forecasts and leakage scenarios were provided, with long-term simulations conducted to evaluate possible affected sea areas. Validation studies were carried out for wind, current, and oil distribution predictions, and the forecasting conclusions were used to support decision-making processes and clean-up actions during the response. The system could potentially lead to a shared system at both national and regional levels.
APPLIED OCEAN RESEARCH
(2021)
Article
Remote Sensing
Oliverio J. Santana, Daniel Hernandez-Sosa, Ryan N. Smith
Summary: This study utilizes a convolutional neural network to detect eddies in satellite altimetry maps. The design is relatively simple but performs competitively compared to previous deep learning methods. Additionally, the model is less sensitive to temporal variations and can identify eddies that traditional models may miss.
INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION
(2022)
Article
Environmental Sciences
Donghui Yi, Alejandro Egido, Walter H. F. Smith, Laurence Connor, Christopher Buchhaupt, Dexin Zhang
Summary: This study characterizes the sea-ice elevation distribution using NASA's Operation IceBridge (OIB) Airborne Topographic Mapper (ATM) data over the Arctic Ocean. The aim is to improve the estimation of sea-ice freeboard. The results show that the sea-ice elevation distribution is positively skewed, and the exponentially modified Gaussian distribution is better suited for fitting the probability density function. The correlation characteristics of the elevation are characterized using the autocorrelation function and correlation length.
Article
Environmental Sciences
Zhankun Wang, Korak Saha, Ebenezer S. Nyadjro, Yongsheng Zhang, Boyin Huang, James Reagan
Summary: The Winter Storm Outbreak of February 2021 caused a significant cooling of the Gulf of Mexico, resulting in extensive marine life loss. By analyzing multiple datasets, this study aims to improve our understanding of the impact of winter storms on the ocean.
Article
Engineering, Ocean
Ciara Dorsay, Galen Egan, Isabel Houghton, Christie Hegermiller, Pieter B. Smit
Summary: Proxy observations of surface winds obtained from the energy levels of the wave spectrum's high-frequency tail can enhance existing remote sensing capabilities. The performance of proxy wind estimates from the Sofar Spotter network is compared with collocated observations from satellites, and various methods show comparable accuracy.
JOURNAL OF ATMOSPHERIC AND OCEANIC TECHNOLOGY
(2023)
Article
Multidisciplinary Sciences
Matthis Auger, Pierre Prandi, Jean-Baptiste Sallee
Summary: In this study, a new Sea Level Anomaly (SLA) product focusing on the subpolar Southern Ocean and its sea ice covered parts is presented. By combining observations from multiple satellites and using state-of-the-art algorithms, the spatial and temporal resolution of the product is improved.
Article
Engineering, Civil
Ryan Solgi, Hugo A. Loaiciga, Mark Kram
Summary: This study demonstrates the superiority of the long short-term memory neural network (LSTM-NN) in groundwater level prediction, highlighting the potential of machine learning in groundwater prediction and stressing the importance of collecting high-quality, long-term groundwater level data for sustainable groundwater management.
JOURNAL OF HYDROLOGY
(2021)