Article
Geochemistry & Geophysics
Ziv Sade, Shahar Hegyi, Maximilian Hansen, Denis Scholz, Itay Halevy
Summary: The curvature and slope of speleothem surfaces affect reaction rates by altering the thickness of the CaCO3-precipitating solution; thinner and faster-flowing solutions have opposite effects on the isotopic composition of carbonate minerals.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Engineering, Civil
Wanyin Qiu, Yunyue Yang, Xiuyang Jiang, Xianfeng Wang, Yi Wang, Jianrong Cai, Yuansheng Liao, Tanghui Feng, Kui Gao, Shuijing Zhai
Summary: This study investigates the relationship between precipitation, dripwater, and modern calcite δO-18 data from Yuhua Cave in Southeast China and the East Asian Summer Monsoon (EASM) and ENSO activities. The results show that δO-18 in precipitation and dripwater can reflect variations in monsoonal activities and ENSO, influenced by mixing ratios and residence time. Additionally, δO-18 in modern calcite is controlled by cave temperature and dripwater, and can record ENSO-related changes. These findings suggest that high-resolution stalagmite δO-18 reconstructions from Yuhua Cave can identify historical ENSO-related variability in the EASM.
JOURNAL OF HYDROLOGY
(2023)
Article
Environmental Sciences
Noelle K. Fillo, Aditi S. Bhaskar, Anne J. Jefferson
Summary: The study quantified the contribution of lawn irrigation to summertime baseflow in Denver using water-stable isotope analysis. Results showed that lawn irrigation made up a certain percentage of urban baseflow on specific days, providing a basis for understanding the impact of lawn irrigation efficiency on water yield.
WATER RESOURCES RESEARCH
(2021)
Article
Engineering, Civil
Mohammad Daud Hamidi, Darren R. Grocke, Suneel Kumar Joshi, Hugh Christopher Greenwell
Summary: There are concerns about the sustainability of groundwater in Kabul due to rapid depletion. This study used stable isotopic analysis to determine the sources and rates of groundwater recharge. The results showed that precipitation was the main source of groundwater recharge, while river water and irrigation return flow also contributed. The contribution of river water to groundwater recharge varied spatially and with depth. The study highlights the importance of understanding the local water cycle for sustainable groundwater management.
JOURNAL OF HYDROLOGY
(2023)
Article
Water Resources
Sierra Wallace, Trent Biggs, Chun-Ta Lai, Hilary McMillan
Summary: The study uses stable isotopes of water to quantify flow pathways delivering water to urban San Diego, finding that hydrologic connectivity controls stormflow sources. After a dry summer, new precipitation reaches the river due to low connectivity between pre-event water and the channel; in wetter conditions, pre-event surface water mixes with infiltration-origin groundwater. The close connection between streamflow and groundwater implies that improving groundwater quality requires improvements to surface water quality.
JOURNAL OF HYDROLOGY-REGIONAL STUDIES
(2021)
Article
Engineering, Environmental
Farooq Ahmad Dar, Ghulam Jeelani, Jerome Perrin, Shakeel Ahmed
Summary: The study focuses on conceptualizing recharge processes and estimating groundwater recharge in a karst aquifer in semi-arid southern India. By using stable isotopes, the research identifies the significance of southwest-monsoon rainwater and the variability of recharge in space and time. The findings highlight the vulnerability of highly karstified areas to contamination and the contribution of irrigation return-flow to groundwater storage in cultivated areas.
GROUNDWATER FOR SUSTAINABLE DEVELOPMENT
(2021)
Article
Environmental Sciences
V Re, S. Kammoun, E. Sacchi, R. Trabelsi, K. Zouari, I Matiatos, E. Allais, S. Daniele
Summary: This study discusses the importance of assessing the origin of nitrate pollution using stable isotope techniques and the challenges in studying nitrate pollution origins in arid and semi-arid regions. The results emphasize the necessity of considering regional and local characteristics in determining nitrate sources and apportionment.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Rene Ventura-Houle, Oscar Guevara-Mansilla, Glenda Requena-Lara, Elizabeth Andrade-Limas, Elisenda Lopez-Altarriba
Summary: Characterization of groundwater flow systems, combined with geochemical evolution, helps assess water-rock interactions and regional hydrogeochemical evolution. Analyzing the geological environment and dynamics of water sources is crucial in identifying groundwater flow patterns. Cluster analysis was used to classify primary element concentrations, distinguishing local, intermediate, and regional groundwater flow, shedding light on the geochemical processes of groundwater and its interaction with geological formations.
ENVIRONMENTAL EARTH SCIENCES
(2021)
Article
Geosciences, Multidisciplinary
Oliver Kost, Saul Gonzalez-Lemos, Laura Rodriguez-Rodriguez, Jakub Sliwinski, Laura Endres, Negar Haghipour, Heather Stoll
Summary: Cave-monitoring studies are crucial for understanding the factors influencing cave systems and interpreting stalagmite records. This study conducted a comprehensive monitoring of cave air, bedrock chemistry, and drip water in La Vallina cave over a 16-month period. The results reveal seasonal variations in drip rates, stable isotopes, trace elements, and carbon isotope signatures, which are driven by factors such as rainfall, evapotranspiration, biological processes, and bedrock dissolution. The findings also provide insights into the seasonal ventilation and stagnation of cave air, as well as the growth patterns of stalagmites.
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2023)
Article
Engineering, Civil
Zhijun Wang, Jian-Jun Yin, Junbing Pu, Qiong Xiao, Tao Zhang, Jianhong Li
Summary: This study monitored a karst spring-fed creek in Southwest China to explore the process of CO2 outgassing and its influencing factors. It revealed that different types of CO2 outgassing along the flow path exist and are significantly influenced by hydrodynamic conditions. The findings showed that both primary and additional CO2 outgassing contribute to the release of soil CO2 back to the atmosphere, with higher flow discharge resulting in less CO2 return.
JOURNAL OF HYDROLOGY
(2021)
Article
Soil Science
Bin-Bin Li, Pan-Pan Li, Wan-Tao Zhang, Jing-Yi Ji, Guo-Bin Liu, Ming-Xiang Xu
Summary: The study reveals that planted forests and shrubs in the Chinese Loess Plateau have negative impacts on deep soil moisture within 1000 cm depth, showing a significant and continuous decrease in soil moisture in the first 20 years, with certain tree species recommended to maintain better soil moisture levels. Additionally, the limiting effects of precipitation on deep soil moisture under planted forests and shrubs may begin to appear when the mean annual precipitation is less than 480 mm.
Article
Agronomy
Martin C. Holdrege, Karen H. Beard, Andrew Kulmatiski
Summary: Research suggests that anticipated increases in precipitation intensity are unlikely to have negative effects on winter wheat production in semiarid climates and silt loam soils. Furthermore, increased precipitation intensity may help alleviate water stress caused by rising temperatures and promote the use of wheat varieties that utilize deeper, later season soil water.
Article
Plant Sciences
Dan Fang, Jingyao Huang, Weiwei Sun, Najeeb Ullah, Suwen Jin, Youhong Song
Summary: Based on climate data from 1999 to 2020, it was found that the precipitation during different growth stages of winter wheat in the Huai river region of China is unevenly distributed. The critical periods of jointing and booting have less precipitation, while the heading-filling and maturation stages have a large fluctuation range of precipitation, leading to the risk of flood and drought. These findings provide a foundation for guiding winter wheat cropping in the region.
FRONTIERS IN PLANT SCIENCE
(2023)
Article
Environmental Sciences
Nora Tunde Lange-Enyedi, Peter Nemeth, Andrea K. Borsodi, Reka Halmy, Gyorgy Czuppon, Ivett Kovacs, Szabolcs Leel-Ossy, Attila Demeny, Judit Makk
Summary: The study aimed to reveal and compare the microbiota of different carbonate speleothems from two different epigenic karst regions in Hungary. It found that oligo-heterotrophic bacteria are widespread in karst caves and play an active role in CaCO3 formation.
GEOMICROBIOLOGY JOURNAL
(2022)
Article
Meteorology & Atmospheric Sciences
Lu Xu, Chaolei Zheng, Yi Ma
Summary: The study found an overall increasing trend in precipitation intensity, with most stations in low-altitude semi-arid regions showing non-significant trends. Frequency indices generally showed a decrease in consecutive dry days and an increase in precipitation days in arid and high-altitude semi-arid regions, indicating a trend towards wetter conditions in these areas. However, there were still some signals of decreasing precipitation intensity and frequency in certain stations in low-altitude semi-arid regions, suggesting an increased risk of drought at a small spatial scale.
INTERNATIONAL JOURNAL OF CLIMATOLOGY
(2021)
Article
Geology
John L. Manrique, Jose E. Ortiz, H. Antonio Delgado
Summary: Vanadium and uranium are crucial elements in the energy and technology industry, and their formation in sedimentary deposits is influenced by redox processes during sedimentation and diagenesis. A geochemical study in La Sota, Ecuador revealed four different associations: organic matter holding V and Zn, phosphatic minerals and concentrations of U, HREE and Ni, Ca in carbonates from a marine environment, and litophile elements associated with detritic minerals. The findings suggest that V is mainly associated with organic matter, while U is associated with P, indicating the formation of uraniferous phosphates during sedimentation.
Article
Computer Science, Interdisciplinary Applications
J. T. Sliwinski, M. Mandl, H. M. Stoll
Summary: A classification-based machine learning algorithm has been developed to analyze layer density of stalagmites, aiding in the study of past variations in speleothem growth rate.
COMPUTERS & GEOSCIENCES
(2023)
Article
Geochemistry & Geophysics
J. T. Sliwinski, O. Kost, L. Endres, M. Iglesias, N. Haghipour, S. Gonzalez-Lemos, H. M. Stoll
Summary: Fluorescent laminations in stalagmites from Asturias, Spain are annual and coincide with peaks in yttrium and troughs in strontium concentrations, which are reliable seasonality markers. Strontium concentrations are positively correlated with stalagmite growth rate and controlled by solution supersaturation, influenced by seasonal variations in cave ventilation. Yttrium concentrations are controlled by drip water flux, surface retention time, and dilation within the matrix. The persistent anti-correlation between strontium and yttrium can be explained as an interplay between their individual controls.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Biodiversity Conservation
Juan P. Lozano-Pena, Carlos J. Polo-Silva, Antonio Delgado-Huertas, Adolfo Sanjuan-Munoz
Summary: This study compares the differences in food resource utilization between the invasive lionfish and native predators using stable isotope data. The results show that there is substantial partitioning in the use of food resources between lionfish and native predators, indicating little apparent ecological impacts on native predators by lionfish in terms of competition for food resources.
Article
Ecology
Maria Antonieta Galindo-Rosado, Felipe Galvan-Magana, Yassir Eden Torres-Rojas, Antonio Delgado-Huertas, Sergio Aguiniga-Garcia
Summary: The silky shark is important in commercial fisheries, but their population has declined in recent years. This study aims to assess the feeding habits and ontogenetic changes in resource and habitat use of C. falciformis in the Eastern Tropical Pacific Ocean (ETPO) based on isotopic analysis of muscle and vertebrae tissue. The data generated in this study indicate ontogenetic changes in the feeding behavior of C. falciformis, which is critical to understanding the role of this predator in the community structure of the ETPO.
ENVIRONMENTAL BIOLOGY OF FISHES
(2023)
Article
Geography, Physical
J. L. Bernal-Wormull, A. Moreno, M. Bartolome, M. Arriolabengoa, C. Perez-Mejias, E. Iriarte, C. Osacar, C. Spotl, H. Stoll, I. Cacho, R. L. Edwards, H. Cheng
Summary: This study utilized stalagmite samples from Mendukilo Cave to investigate the hydroclimate changes in the northern part of Iberia. Carbon isotopes revealed millennial-scale shifts in response to hydroclimate changes, while oxygen isotopes showed variations correlated with North Atlantic events. The findings indicated a delay in the onset of humid conditions in the early Holocene and a subsequent trend towards drier and colder conditions between 6.0 and 2.5 kyr BP. This high-resolution speleothem record demonstrated the complex connection between the North Atlantic and Western Europe during the last millennia and the regional heterogeneity of Iberia's hydroclimate.
QUATERNARY SCIENCE REVIEWS
(2023)
Article
Geology
Andres Castrillon, Franck Lartaud, Antonio Delgado-Huertas, Fernando Nunez-Useche
Summary: The Cerro Matoso deposit, one of the largest open-pit ferronickel mines in the world, is formed by a sedimentary succession on top of an abducted ultramafic body. The sediments were accreted in northwestern Colombia during the Cretaceous and exposed to weathering processes during the last Andean Orogeny. The isotopic and geochemical analyses suggest a possible link to deep-sea hydrothermal activity.
BOLETIN DE GEOLOGIA
(2023)
Article
Geography, Physical
Jiahui Cui, Jingyao Zhao, Xiyu Dong, Carlos Perez-Mejias, Jing Lu, Ye Tian, Jian Wang, Liangkang Pan, Haiwei Zhang, Hai Cheng
Summary: The oxygen isotope record of a speleothem from Zhangjia Cave reveals the changes in the Asian summer monsoon during the 134-ka event. This event divided the weak Asian summer monsoon interval-II into two stages and was influenced by the Atlantic Meridional Overturning Circulation.
QUATERNARY RESEARCH
(2023)
Article
Multidisciplinary Sciences
Hongrui Zhang, Yongsong Huang, Reto Wijker, Isabel Cacho, Judit Torner, Madeleine Santos, Oliver Kost, Bingbing Wei, Heather Stoll
Summary: The high-resolution paleoclimate records on the Iberian Margin are important for studying abrupt climate events. Previous studies suggested a correlation between surface cooling and water freshening, but recent data indicate that the high concentration of a specific alkenone is not caused by decreased salinity, but by a decrease in sea surface temperature. Additionally, surface freshening does not always trigger cooling during millennial climate changes, sometimes occurring in the middle of cooling events and potentially amplifying temperature decrease.
NATURE COMMUNICATIONS
(2023)
Article
Geography, Physical
Ixeia Vidaller, Enaut Izagirre, Luis Mariano del Rio, Esteban Alonso-Gonzalez, Francisco Rojas-Heredia, Enrique Serrano, Ana Moreno, Juan Ignacio Lopez-Moreno, Jesus Revuelto
Summary: The Aneto glacier, the largest in the Pyrenees, has been continuously melting in recent decades, with signs of accelerated melting in recent years. From 1981 to 2022, the glacier's surface and thickness have decreased, with a 64.7% reduction in glacierized area and an average thickness loss of 30.5 meters. The current average remaining thickness is 11.9 meters, indicating the critical situation of the glacier and the potential segmentation into two smaller ice bodies.
Article
Geosciences, Multidisciplinary
Oliver Kost, Saul Gonzalez-Lemos, Laura Rodriguez-Rodriguez, Jakub Sliwinski, Laura Endres, Negar Haghipour, Heather Stoll
Summary: Cave-monitoring studies are crucial for understanding the factors influencing cave systems and interpreting stalagmite records. This study conducted a comprehensive monitoring of cave air, bedrock chemistry, and drip water in La Vallina cave over a 16-month period. The results reveal seasonal variations in drip rates, stable isotopes, trace elements, and carbon isotope signatures, which are driven by factors such as rainfall, evapotranspiration, biological processes, and bedrock dissolution. The findings also provide insights into the seasonal ventilation and stagnation of cave air, as well as the growth patterns of stalagmites.
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2023)
Article
Ecology
Amanda Gerotto, Hongrui Zhang, Renata Hanae Nagai, Heather M. Stoll, Rubens Cesar Lopes Figueira, Chuanlian Liu, Ivan Hernandez-Almeida
Summary: Understanding the variations in ocean carbonate chemistry is essential for understanding the global carbon cycle. Fossil shells from marine calcifiers are widely used as proxies for past ocean carbon cycle. However, interpreting these records can be challenging due to physiological and ecological responses during organisms' life cycles and potential preservation at the seafloor. This study presents a new dissolution proxy based on the morphological attributes of coccolithophores from the Noelaerhabdaceae family. Evaluating the influences of calcification and preservation on fossil morphology, the results suggest that carbonate saturation of the deep ocean explains the highest proportion of variation in the morphological data.
Article
Geography, Physical
Miguel Bartolome, Gerard Cazenave, Marc Luetscher, Christoph Spoetl, Fernando Gazquez, Anchel Belmonte, Alexandra V. Turchyn, Juan Ignacio Lopez-Moreno, Ana Moreno
Summary: Ice caves, especially those in inaccessible permafrost areas at high altitudes or high latitudes, are one of the least studied parts of the cryosphere. The Devaux cave, located on the French-Spanish border, was characterized in terms of climate dynamics and geomorphological features. The cave consists of two distinct sectors with different air temperature and geomorphological characteristics. The formation of the cave permafrost is attributed to a combination of undercooling by ventilation and diffusive heat transfer from the surrounding permafrost.
Article
Archaeology
I. Intxaurbe, M. Arriolabengoa, D. Garate, H. Cheng, C. Perez-Mejias
Summary: Santimamine Cave in North Spain is a well-known archaeological site that was discovered and excavated in the early 20th century. It is famous for its parietal art and lithochemical deposits in the form of speleothems, which have created obstacles in the cave. A recent study has successfully reconstructed the cave virtually, allowing for a better understanding of human behavior and artistic production during the Middle and Upper Magdalenian period.
JOURNAL OF ARCHAEOLOGICAL SCIENCE-REPORTS
(2023)
Article
Geochemistry & Geophysics
Xinze Lu, Geoffrey J. Gilleaudeau, Brian Kendall
Summary: The Late Ordovician mass extinction is the first major extinction event in the Phanerozoic, but the reasons for the decline in global biodiversity before the extinction are not well understood.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2024)
Article
Geochemistry & Geophysics
Junyao Kang, Daniel D. Gregory, Benjamin Gill, Shiqiang Huang, Changxin Lai, Zhaoshan Chang, Huan Cui, Ivan Belousov, Shuhai Xiao
Summary: Sedimentary pyrite is an important geological archive, but it can be altered by diagenetic and hydrothermal processes. This study successfully trained machine learning algorithms to distinguish pyrite origins using trace element data. The approach was validated and applied to identify the origins of pyrite in two sedimentary successions in South China.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2024)