Article
Geography, Physical
Simon Faye, Andre Rochon, Guillaume St-Onge, Isabel Vilanova, Anne de Vernal, Pierre-Arnaud Desiage
Summary: We used pollen and dinocyst assemblages from sedimentary sequences in the San Jorge Gulf to study the vegetation history of the extra-Andean/eastern Patagonia region and the variations in the Southern Westerly Wind Belt (SWWB) during the Late Pleistocene and Holocene. We found that before 14 cal ka BP, the vegetation was dominated by halophytic plants related to arid coastal conditions. After 14 cal ka BP, shrub and herb vegetation developed in the Patagonian steppe under semi-arid conditions. Changes in Nothofagus pollen abundances and marine palynomorphs indicated a transition at 14 cal ka BP, suggesting strong westerlies and sea-level rise. Dinocyst assemblages provided information on changes in summer sea-surface temperature (SST) and annual net primary productivity. The early Holocene was characterized by warmer conditions and high SWWB intensity, while the middle Holocene showed increased heterotrophic taxa and gradual cooling of surface water. After 4 cal ka BP, pollen data indicated a decrease in SWWB intensity, correlated with glacier advances and lower summer SST in the San Jorge Gulf.
QUATERNARY SCIENCE REVIEWS
(2023)
Article
Geosciences, Multidisciplinary
Qinbo Xu, Linlin Zhang, Xin Xiao, Chun Zhou, Fan Wang, Dunxin Hu
Summary: This article investigates the seasonal connection between LSDO and DWBC, revealing that the seasonal variation in DWBC influences the LSDO by adjusting the temperature field on the east side of the Luzon Strait.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Biotechnology & Applied Microbiology
Diana Paula Quezada, Maria Lujan Flores, Osvaldo Leon Cordoba
Summary: The alga Undaria pinnatifida from Golfo San Jorge region was studied for its chemical profile and biological activity. The results showed it synthesized various bioactive metabolites, with differences according to the season. The alga exhibited potential as a source of bioactive molecules, and seasonal studies were important for determining the best collection season based on the metabolites to be studied.
JOURNAL OF APPLIED PHYCOLOGY
(2023)
Article
Environmental Sciences
Edgardo Basilio Farach-Espinoza, Juana Lopez-Martinez, Ricardo Garcia-Morales, Manuel Otilio Nevarez-Martinez, Daniel Bernardo Lluch-Cota, Sofia Ortega-Garcia
Summary: This study identifies mesoscale events in the Gulf of California using satellite images, analyzing their frequency, duration, and relationship with climatic factors. It reveals seasonal variations in different regions, along with associations with El Nino and the Pacific Decadal Index.
Article
Geosciences, Multidisciplinary
N. Sanchez-Carnero, D. Rodriguez-Perez
Summary: The study discusses the factors influencing benthic habitats and the research methods used, emphasizing the importance of multibeam echosounders in providing data for seabed classification. The data acquired in the Robredo area reveals the substrate characteristics and bottom structure complexity, leading to important insights into the benthic geohabitats. The results show that Robredo has two subareas with different substrate types, indicating the significance of bottom structure complexity in seabed classification.
GEO-MARINE LETTERS
(2021)
Article
Geosciences, Multidisciplinary
Marcos E. Bahia, L. Mariana Longo, Claudia L. Ravazzoli, Nicolas Scivetti, Leonardo Benedini, Paulo Marcos, Daniel A. Gregori
Summary: This study analyzed the subsurface structure of the San Jorge Gulf basin in Argentina using gravimetric data integrated with geological information, revealing gravity lows and highs in the western flank and basement horst-like structures. The 3D gravity model showed the geometry of the basin's eastern sector and indicated that the gravimetric method could be a fast, economic, robust, and reliable exploration method for the area. Additionally, the method proved useful for detecting potential structures of interest that had not been identified previously.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2021)
Article
Multidisciplinary Sciences
Shikhar Rai, Matthew Hecht, Matthew Maltrud, Hussein Aluie
Summary: Using satellite data and a recent method to disentangle multiscale processes, it was found that wind deposits kinetic energy into the geostrophic ocean flow at scales larger than 260 km while removing energy from smaller scales, a process known as eddy killing. This process occurs at all times with seasonal variability, peaking in winter, and removes a substantial fraction of the wind power input in western boundary currents, serving as a major dissipation pathway for mesoscales, the ocean's most energetic scales.
Article
Geography, Physical
Pierre-Arnaud Desiage, Guillaume St-Onge, Mathieu J. J. Duchesne, Jean-Carlos Montero-Serrano, Miguel J. J. Haller
Summary: This study provides a detailed description of the upper sedimentary succession in the Gulf of San Jorge, based on high-resolution seismic profiles and sediment cores. It confirms the existence of a paleo-fluvial network buried by estuarine deposits during marine transgression. The analysis suggests a rapid sea-level rise consistent with Meltwater Pulse 1A, highlighting the significant impact of sea-level rise on sedimentation in the gulf.
JOURNAL OF QUATERNARY SCIENCE
(2023)
Article
Meteorology & Atmospheric Sciences
Dafydd Stephenson, F. Sevellec
Summary: This study introduces an optimization framework and computational method to investigate sources of ocean uncertainty, revealing that high-frequency variations in meridional transports are mainly wind-driven, while surface buoyancy forcing is the dominant source of uncertainty at lower frequencies. Mesoscale eddies contribute the most to year-averaged quantities in the subtropical region, but their impact is significantly reduced in the subpolar region.
JOURNAL OF CLIMATE
(2021)
Article
Oceanography
Javier Zavala-Garay, Peter Rogowski, John Wilkin, Eric Terrill, R. Kipp Shearman, Lam Hong Tran
Summary: As part of a U.S.-Vietnam collaborative effort, a numerical model has been used to study the dynamics of seasonal variability in the Gulf of Tonkin. The model is validated using historical and recent observations, and the dynamics are mainly influenced by monsoons, transport through the Qiongzhou Strait, the western boundary current, and river discharge. Various processes modify the wind-driven dynamics, promoting cyclonic circulation.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Oceanography
Xiaoyue Hu, Huijie Xue, Linlin Liang
Summary: This study examines the oceanic wave propagation in the Indonesian seas from 2000 to 2016 using a regional ocean model simulation. The model simulation agrees well with the interannual variability of sea level anomaly and observed currents in the entrance passages of the Indonesian Throughflow (ITF). Lag correlation analysis suggests that the interannual sea level anomaly and opposing velocity responses above and below the thermocline in the western and eastern pathways of the ITF are associated with ENSO-induced Rossby waves from the equatorial Pacific. The study also highlights the importance of both the eastern and western pathways in the propagation of ENSO signals in the Indonesian seas, with different roles attributed to the nonlinear processes in the Sulawesi Sea.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Meteorology & Atmospheric Sciences
N. Ritzhaupt, D. Maraun
Summary: The uncertainties of regional precipitation projections are significant. There are many projections using different models from different ensembles, but their consistency has not been systematically evaluated. This study compares projections of mean precipitation and extremes of daily precipitation across a wide range of climate model ensembles, revealing both large-scale patterns of changes and substantial discrepancies at the regional scale.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Meteorology & Atmospheric Sciences
Navid C. Constantinou, Andrew McC. Hogg
Summary: This study evaluates how the ocean's intrinsic variability leads to patterns of upper-ocean heat content that vary at decadal time scales. These patterns have the potential to feed back on the atmosphere and affect climate modes of variability. Results suggest that moving towards coupled climate models with higher oceanic resolution is crucial for improving climate projections and predicting decadal climate modes of variability accurately.
JOURNAL OF CLIMATE
(2021)
Article
Oceanography
Yujia Zhai, Jiayan Yang, Xiuquan Wan
Summary: The study quantifies and examines the mean and seasonal variability of the equatorial western boundary current (EWBC) in the upper ocean layer using two data assimilation products. It reveals that the EWBC displays anti-symmetric variability across the equator and the amplitude of seasonal variations is greater in the northern hemisphere. The study attributes this anti-symmetry to the impingement of equatorial Rossby waves at the western boundary and the shape of the western boundary amplifies the seasonal variability in the northern hemisphere.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Meteorology & Atmospheric Sciences
Eugenia Maria Garbarini, Marcela Hebe Gonzalez, Alfredo Luis Rolla
Summary: The aim of this study is to quantify the influence of the South Pacific High (SPH) on seasonal rainfall in Argentina. Results show that the intensity of SPH mainly affects precipitation in northern and southern Argentina, while the latitudinal shift of SPH impacts the northeast in summer and winter, as well as regions in the south and central of the country during winter and spring. The study suggests that the position and intensity of SPH can provide some predictability for rainfall in certain regions of Argentina.
INTERNATIONAL JOURNAL OF CLIMATOLOGY
(2021)