Article
Meteorology & Atmospheric Sciences
Edward. D. D. Zaron, Tonia. A. A. Capuano, Ariane Koch-Larrouy
Summary: Twenty years of daily MODIS-Aqua ocean color observations (2002-2022) revealed periodic variability of near-surface chlorophyll (Chl a) in the Indonesian seas, with a prominent peak around the fortnightly tidal period. The spatial distribution of the fortnightly Chl a signal was quantified and mapped, showing significant variability along the continental shelves of NW Australia and at several sites associated with narrow passages between islands. The shallow coastal sites exhibited changes attributed to the spring-neap cycle of barotropic ocean currents, while deeper water near island passages showed variability due to the modulation of vertical nutrient fluxes by baroclinic tidal mixing. These findings highlight the importance of tidal mixing and the heterogeneous nature of biophysical processes in the Indonesian seas.
Article
Environmental Sciences
Linchao Xin, Shijian Hu, Fan Wang, Wenhong Xie, Dunxin Hu, Changming Dong
Summary: The Indonesian Throughflow (ITF) is a crucial link between the tropical Pacific and Indian Oceans, and understanding its transport is important for climate systems. In this study, a deep-learning approach using a convolutional neural network model was used to reproduce the ITF transport based on sea surface height data. The model showed high accuracy in predicting ITF transport, indicating the potential of using deep-learning methods for forecasting.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Environmental Sciences
Raden Dwi Susanto, Richard D. Ray
Summary: The Indonesian seas play a crucial role in regulating Pacific-Indian Ocean exchange, regional air-sea interaction, and global climate phenomena. The study demonstrates that monsoon and El Nino Southern Oscillation (ENSO) have an impact on tidal mixing in the Indonesian seas, with more vigorous mixing during the southeast monsoon and El Nino. These findings have implications for long-term variations and changes in water mass transformation, circulation, and climate in the Pacific-Indian Ocean.
Article
Geochemistry & Geophysics
Kenji M. Matsuzaki, Ann E. Holbourn, Wolfgang M. Kuhnt, Masayuki Ikeda, Li Gong
Summary: This study analyzed the response of the Indonesian Throughflow and Asian-Australian Monsoon to global climate change and found that these responses are influenced by glacioeustatic sea-level variations and tropical monsoon strength. The variations in radiolarian assemblages associated with climate changes in the source region had a significant impact on sea surface temperatures and the Indonesian Throughflow.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Environmental Sciences
Jie Li, Yuanlong Li, Yaru Guo, Gang Li, Fan Wang
Summary: The southeastern Indian Ocean (SEIO) experiences prominent decadal variability in sea surface salinity (SSS), with decreases from 1995-2000 and 2005-2011 and increases from 2000-2005 and after 2011. This study successfully simulates the decadal SSS variability in the SEIO using a high-resolution regional ocean model and explores the underlying mechanism through sensitivity experiments. It is found that freshwater transport of the Indonesian throughflow (ITF) and local precipitation are the main drivers of the SSS decadal variability.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Environmental Sciences
Chunmei Feng, Wei Jiang, Kefu Yu, Yinan Sun, Sirong Xie, Yansong Han, Chaoshuai Wei
Summary: Barium plays a crucial role in understanding marine biogeochemical processes, but limited knowledge of sources and variations hinders comprehension of these processes. Coral Ba/Ca ratios have potential as a tracer of oceanic Ba, but long-term and high-resolution records are lacking. This study analyzed a 32-year record of coral Ba/Ca ratios and delta 18O from Weizhou Island in the South China Sea to elucidate sources and influencing factors on surface seawater Ba. The results indicate that coral Ba/Ca ratios can serve as a proxy for seawater Ba concentrations, and anthropogenic activities may elevate Ba levels. The study contributes to understanding the complex biogeochemical cycling of marine Ba.
SCIENCE OF THE TOTAL ENVIRONMENT
(2024)
Article
Environmental Sciences
Greta Sartori, Michelle L. Taylor, Pascal Sebastian, Rahmadi Prasetyo
Summary: Carnivorous fish are essential for the Indonesian population, and it is crucial to incorporate environmental features into marine protected areas to support their thriving. This study investigated the relationship between current velocity, chlorophyll-a, sea surface height, temperature, and the biomass of carnivorous fish. Different fish families showed varying degrees of dependency on coral cover and oceanographic factors, likely due to their unique body shapes, habitats, and feeding habits. Future research on a broader scale is needed to inform marine spatial planning decisions.
MARINE ENVIRONMENTAL RESEARCH
(2021)
Article
Multidisciplinary Sciences
Maike Leupold, Miriam Pfeiffer, Takaaki K. Watanabe, Nobuko Nakamura, Lars Reuning, Alina Blume, Tim McClanahan, Mchulla Mohammed, Herman Kiriama, Dieter Garbe-Schoenberg, Andrea Schroder Ritzrau, Jens Zinke
Summary: Proxy reconstructions suggest that sea surface temperature seasonality in the western Indian Ocean during the mid-Holocene was reduced compared to the present record, possibly due to a shift of maximum insolation caused by precessional forcing.
SCIENTIFIC REPORTS
(2023)
Article
Geosciences, Multidisciplinary
Wei Jiang, Xingyuan Wu, Kefu Yu, Haodan Yang, Shendong Xu, Ning Wang, Yangyang Yong, Yinan Sun, Chaoshuai Wei, Yinghui Wang
Summary: Vanadium, a typical contaminant in fossil fuels, has significantly increased due to human activities. However, research on vanadium geochemistry in the ocean has lagged behind. In this study, a high-resolution temporal record of geochemical proxies in a coral colony from the northern South China Sea was used to reconstruct historical patterns of vanadium in surface seawater. The study found a close association between surface winds and coral V/Ca ratios, indicating its potential for documenting prehistoric changes in tropical cyclones. Additionally, the coral V/Ca record captured the temporal patterns of anthropogenic activities, providing a valuable tool for testing the efficacy of pollution prevention legislation.
SCIENCE CHINA-EARTH SCIENCES
(2022)
Article
Oceanography
Ankitha Kannad, Nathalie F. Goodkin, Dhrubajyoti Samanta, Sujata A. Murty, Riovie D. Ramos, Jason E. Smerdon, Arnold L. Gordon
Summary: The flow of Pacific water into the Indian Ocean via the South China Sea and Maritime Continent plays a crucial role in the ocean thermohaline circulation. Climate variability, such as the East Asian monsoon and major climate modes, affects the transport and salinity of the water. The recent intensification and dominance of the Indian Ocean Dipole and El Nino Southern Oscillation may have implications for regional and global thermohaline circulation.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Geosciences, Multidisciplinary
Xuan Ding, Franck Bassinot, Xiaolei Pang, Yingxin Kou, Liping Zhou
Summary: The Indonesian Throughflow (ITF) plays an important role in the ocean-atmosphere interaction in the tropical region. By reconstructing sea surface temperature, thermocline water temperature, and vertical structure for the past 160,000 years, this study found that the vertical structure of the ITF remained unchanged during its penetration into the Indian Ocean and it is an important route for thermocline water transport. However, the vertical structure of the ITF varied through time and impacted the heat transport processes along the outflow pathway in the eastern Indian Ocean.
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2023)
Article
Geography, Physical
Shichen Tao, Kefu Yu, Hongqiang Yan, Huiling Zhang, Luo Wang, Patrick Rioual, Qi Shi, Zhongzhou Huang, Tegu Chen
Summary: This study found that sea-level in the South China Sea experienced a slight decrease from 1850 to 1900, and has been continuously rising since 1900. The study also revealed the indirect influence of ENSO and human activities on sea-level, rainfall, and salinity in the South China Sea.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Environmental Sciences
Kaan Georg Kutlucinar, Sebastian Handl, Roza Allabashi, Tim Causon, Christina Troyer, Ernest Mayr, Reinhard Perfler, Stephan Hann
Summary: A comprehensive non-targeted analytical workflow has been developed and applied to investigate the composition and variation of groundwater and surface water at a riverbank filtration site on the Danube River. The study reveals that the riverbank filtration system is effective in reducing the concentration of compounds in surface water and demonstrates the feasibility of assessing filtration efficiency and compound residence time.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Oceanography
Peng Zhang, Jian Xu, Sebastian Beil, Ann Holbourn, Wolfgang Kuhnt, Tiegang Li, Zhifang Xiong, Hong Yan, Rui Cui, Heng Liu, Hanning Wu
Summary: The Indonesian Throughflow (ITF) is crucial for regulating the thermohaline balance between the Pacific and Indian Oceans, with variability driven by precessional forcing rather than monsoonal upwelling. The ITF intensity and vertical structure were controlled by Earth's axis wobble, impacting the distribution of solar radiation and influencing the Intertropical Convergence Zone and winds and temperatures over the tropical Pacific Ocean.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Meteorology & Atmospheric Sciences
Zhibo Gao, Jiangshan Zhu, Yan Guo, Neng Luo, Yuan Fu, Tiantian Wang
Summary: A record-breaking extreme rainfall event occurred in Guangzhou, China on May 6-7, 2017, with a maximum rainfall amount over 24 hours reaching 524.1 mm. The study investigated the impact of land surface processes on this extreme rainfall and found that different land surface models produced varied simulation results, with urban heat islands and urban convection playing key roles in the formation of heavy rainfall.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2021)
Article
Oceanography
Thomas P. Guilderson, Daniel P. Schrag, Ellen R. M. Druffel, Ron W. Reimer
Summary: The study of a high-resolution coral Delta C-14 record from the leeward side of the Big Island of Hawai'i provides insights into the pre- and post-bomb era changes. Seasonal cycles, La Nina years, and Sverdrup dynamics are all reflected in the record, indicating climate variability in the subtropical North Pacific.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Geosciences, Multidisciplinary
Ronald E. Thresher, Stewart J. Fallon
Summary: The study found periodic decadal variability in metal/calcium ratios in deep-sea gorgonian corals in the Southwest Pacific, likely caused by vertical shifts in water mass distributions. Additionally, long-term trends in three environmental proxies reversed in the early to mid-1900s.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geochemistry & Geophysics
Rachel Wood, Andre Barros Curado Fleury, Stewart Fallon, Thi Mai Huong Nguyen, Anh Tuan Nguyen
Summary: In hot environments, collagen degrades quickly, making it difficult to obtain accurate dates through C-14 dating of bones. Although hydroxyapatite contains a small amount of carbonate, it is often heavily contaminated with exogenous carbonate, leading to underestimated dates. Acetic acid appears to be the most effective in removing carbonate contaminants.
Article
Marine & Freshwater Biology
Belinda Dechnik, Alex C. Bastos, Laura S. Vieira, Jody M. Webster, Stewart Fallon, Yusuke Yokoyama, Juan-Carlos Braga, Manuel A. Pereira, Luke Nothdurft, Kelsey Sanborn, Rodrigo L. Moura, Gilberto Amado-filho
Summary: The study on the eastern Brazilian continental shelf revealed that Holocene reef growth in the South Atlantic is influenced by various factors. The progression of reef development and timing at which each reef shifts states are affected by substrate availability and initial transgression conditions. Factors such as hydrodynamic energy, morphology, sedimentation, and reef assemblages play a role in the evolution of reefs, which have been shown to be sensitive to changes in water quality.
Article
Environmental Sciences
Yang Wu, Stewart J. Fallon, Neal E. Cantin, Janice M. Lough
Summary: This study utilized coral-based proxies to reconstruct sea surface temperatures, finding that U/Ca was the most reliable and stable temperature proxy for corals from the Great Barrier Reef over long-term timescales. Sr/Ca was also reliable, but less sensitive to annual SST changes. Li/Mg and B/Mg showed clearer periodicity and strong correlation with SST. Empirical calibrations from a multi-proxy approach can enhance the certainty of temperature reconstructions, especially when a single proxy may not perform well. Additionally, site- and colony-specific SST calibrations provide an opportunity to improve the universal multi-trace element calibration of sea surface temperatures.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Geochemistry & Geophysics
Julie Heggdal Velle, Maureen H. Walczak, Brendan Reilly, Guillaume St-Onge, Joseph S. Stoner, Stewart Fallon, Alan C. Mix, Christina Belanger, Matthias Forwick
Summary: The study investigated high-resolution paleomagnetic records of sediments from the south Alaska continental slope, suggesting that Site U1419 provides the ability to study paleomagnetic secular variation. Due to various factors, sediments at this site are not suitable for paleointensity studies, but the inclination record is deemed reliable to some extent and offers insights into regional geomagnetic variations.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Susanne Lindauer, Carla S. Hadden, Kita Macario, Thomas P. Guilderson
Summary: This article provides a brief overview of research on marine carbonates over the past 60 years, focusing on shell and coral samples. Shells and corals, due to their annual growth patterns, offer the possibility of examining past variations in radiocarbon levels. This research has implications for climate studies, dating techniques, and environmental research.
Article
Environmental Sciences
Gabriel O. Cardoso, Ludmilla N. Falsarella, Pamela M. Chiroque-Solano, Carla C. Porcher, Felipe P. Leitzke, Aline C. Wegner, Thiago Carelli, Paulo S. Salomon, Alex C. Bastos, Fabian Sa, Stewart Fallon, Leonardo T. Salgado, Rodrigo L. Moura
Summary: In November 2015, the collapse of the Fundao dam in Minas Gerais, Brazil led to significant environmental and socioeconomic impacts as over 40 million cubic meters of iron ore tailings entered the Doce river. The downstream mudslide scoured contaminants deposited in the riverbed, releasing potentially toxic elements into the estuarine conditions. Despite a turbidity plume forming off the river mouth, the dispersion of contaminants in the ocean remains poorly assessed.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Geology
Maija J. Raudsepp, Sasha Wilson, Bree Morgan, Avni Patel, Scott G. Johnston, Emma J. Gagen, Stewart J. Fallon
Summary: This study evaluates the crystallization pathway of Ca-Mg carbonates in the Coorong Lakes and suggests that high magnesium calcite and magnesite likely precipitate via a non-classical crystallization pathway. The lakes' water only becomes supersaturated relative to amorphous carbonate phases after extensive evaporation in late summer, limiting the precipitation through non-classical crystallization.
Article
Geosciences, Multidisciplinary
Erin K. Peck, Thomas P. Guilderson, Maureen H. Walczak, Robert A. Wheatcroft
Summary: This study investigates the timescale of salt marsh reestablishment in Netarts Bay, Oregon following the 1700 CE earthquake. The results show that the coseismic subsidence lasted for 200 years before transitioning to the modern high marsh. This research provides insight into the intertidal morphodynamic response to large perturbations along tectonically active margins.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geography, Physical
Anna Glueder, Alan C. Mix, Glenn A. Milne, Brendan T. Reilly, Jorie Clark, Martin Jakobsson, Larry Mayer, Stewart J. Fallon, John Southon, June Padman, Andrew Ross, Thomas Cronin, Jennifer L. McKay
Summary: This study reveals past regional ice-mass changes near Petermann Glacier in NW Greenland through relative sea level data obtained from marine bivalves. The research found that there was ice loss at Petermann Glacier at or before 9,000 years ago, followed by further mass loss around 6,000 years ago. The study speculates that regional ice caps regrew during the mid-Holocene in response to cooling and increased precipitation.
QUATERNARY SCIENCE REVIEWS
(2022)
Article
Multidisciplinary Sciences
Nicholas T. Hitt, Daniel J. Sinclair, Helen L. Neil, Stewart J. Fallon, Aimee Komugabe-Dixson, Denise Fernandez, Philip J. Sutton, John C. Hellstrom
Summary: Using a high-resolution paleocirculation archive, this study found a correlation between the South Pacific Gyre (SPG) and the Southern Annular Mode (SAM), resulting in transport changes of subtropical waters during specific periods. By reconstructing several gyre intensification cycles, it revealed the natural co-variability of gyre strength and SAM on anthropogenic timescales, which is important for future climate projections.
SCIENTIFIC REPORTS
(2022)
Article
Geochemistry & Geophysics
Eduardo Q. Alves, Kita D. Macario, Rita Scheel-Ybert, Fabiana M. Oliveira, Andre Carlo Colonese, Paulo Cesar Fonseca Giannini, Renato Guimaraes, Stewart Fallon, Marcelo Muniz, David Chivall, Christopher Bronk Ramsey
Summary: This study investigates a Late Holocene shell mound in Southern Brazil using a multidisciplinary approach. The results reveal a negative local correction for the marine reservoir effect (MRE) in the area and a diet high in marine proteins for the inhabitants. The study also discusses various complications encountered when conducting MRE studies using shell mound sites.
Article
Geochemistry & Geophysics
R. E. Wood, R. Esmay, E. Usher, S. J. Fallon
Summary: The Single Stage AMS radiocarbon facility at the Australian National University has been in operation for 14 years. This paper discusses the pretreatment methods used for the different types of samples and examines the effectiveness of quality assurance protocols in detecting altered materials. Most of the fossil samples tested by the facility come from tropical and arid environments, where diagenesis of organic samples and carbonates is often severe. A significant proportion of the submitted samples cannot be dated, emphasizing the importance of screening and quality assurance methods. After analyzing 250 measurements on bone collagen, revised quality assurance indicators for bone samples are proposed.
Article
Multidisciplinary Sciences
Irka Hajdas, Philippa Ascough, Mark H. Garnett, Stewart J. Fallon, Charlotte L. Pearson, Gianluca Ouarta, Kirsty L. Spalding, Haruka Yamaguchiw, Minoru Yoneda
Summary: Radiocarbon dating utilizes the decay of a radioactive isotope of carbon to measure time and date objects, proving particularly useful for specimens formed over the past 55,000 years. Advancements in measurement techniques, instrument capacity, sample selection, and data processing have expanded the application of radiocarbon dating across various fields.
NATURE REVIEWS METHODS PRIMERS
(2021)