Article
Environmental Sciences
Yalei Li, Hege Gundersen, Robert Noddebo Poulsen, Lina Xie, Zhenming Ge, Kasper Hancke
Summary: Macroalgae and seagrass washed ashore create an ocean-to-land transport of carbon and nutrients. A novel method combining UAV photogrammetry and in situ measurements was proposed to quantify marine carbon and nutrient deposits in beach zones. The UAV method showed high accuracy for volume acquisition and cross-sectional area assessment when compared to manual and GNSS measurements. The method demonstrated its effectiveness in quantifying ecosystem carbon and nitrogen deposits, making it valuable for environmental monitoring and management.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Agronomy
Linhua Wang, Mengxiao Yu, Shu Ye, Junhua Yan
Summary: Precipitation and energy are key factors affecting carbon and water fluxes in subtropical forest ecosystems. This study finds that winter increases the magnitude and percentage of gross ecosystem productivity (GEP) and ecosystem respiration (Reco), while spring, summer, and autumn show decreased GEP and increased Reco. Net ecosystem productivity (NEP) slightly declines during the study period, and most of the annual net carbon gains occur in winter and spring. Soil moisture is the main contributor to GEP in summer, while solar radiation predominantly contributes to GEP in spring and winter. Vapor pressure deficit (VPD) is a major driver of Reco in summer and autumn, while in spring and winter, Reco is mainly influenced by soil environmental conditions. The different responses of carbon assimilation and respiration to altered energy and moisture availability determine the seasonal patterns of carbon and water fluxes in subtropical forest ecosystems.
AGRICULTURAL AND FOREST METEOROLOGY
(2023)
Article
Geosciences, Multidisciplinary
Paul D. Zander, Maurycy Zarczynski, Wojciech Tylmann, Shauna-kay Rainford, Martin Grosjean
Summary: Varved lake sediments are important archives for paleoclimatic information, but quantitative reconstructions based on biogeochemical composition are rare due to complexity. Recent advancements in high-resolution imaging and elemental mapping allow for better understanding of varve formation processes and climate-proxy relationships. This study presents a geochemical dataset from Lake Zabinskie, Poland, analyzing how seasonal meteorological conditions influence sediment composition and varve types, with the use of generalized additive models for climate inference.
CLIMATE OF THE PAST
(2021)
Article
Engineering, Civil
Shuang-Ye Wu, Zelalem Bedaso
Summary: This study identifies the controlling factors for variations of precipitation isotopes in Ethiopia and quantifies the contributions of different moisture sources. Recycled continental moisture is found to be the dominant source of precipitation isotopes, with significant variations between wet and dry seasons. Strong convective activities play a crucial role in regulating isotopic values, contributing to the seasonal patterns observed. These findings offer important insights for interpreting paleoclimate proxies and understanding hydroclimate processes in the region.
JOURNAL OF HYDROLOGY
(2022)
Article
Environmental Sciences
William E. Lukens, Robert T. Narmour, Brian A. Schubert
Summary: This study analyzed high-resolution delta O-18(cell) profiles of three longleaf pine trees in a native savanna in Louisiana, United States, covering a wide range of rainfall conditions from 2001 to 2008. The results showed strong correlations between delta O-18(cell) values within and between trees, and highlighted the influence of specific soil conditions on the expression of latewood delta O-18(cell) values.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2021)
Article
Multidisciplinary Sciences
Solomon Gebrechorkos, Julian Leyland, Louise Slater, Michel Wortmann, Philip J. Ashworth, Georgina L. Bennett, Richard Boothroyd, Hannah Cloke, Pauline Delorme, Helen Griffith, Richard Hardy, Laurence Hawker, Stuart Mclelland, Jeffrey Neal, Andrew Nicholas, Andrew J. Tatem, Ellie Vahidi, Daniel R. Parsons, Stephen E. Darby
Summary: A novel statistical downscaling model is used to downscale global climate models, providing higher-resolution climate data for assessing local scale changes in climate and their impacts.
Article
Multidisciplinary Sciences
Ning Zhan, Weihang Liu, Tao Ye, Hongda Li, Shuo Chen, Heng Ma
Summary: Incorporating seasonality into livestock spatial distribution is important for studying the interaction between climate, vegetation, water, and herder activities. This study provides the spatial distribution of livestock grazing on warm-season and cold-season pastures on the Qinghai-Tibet Plateau. The random forest classification model and dasymetric mapping results show high accuracy in predicting the seasonal distribution of grazing.
Article
Multidisciplinary Sciences
Lyle L. Nelson, James L. Crowley, Emily F. Smith, Darin M. Schwartz, Eben B. Hodgin, Mark D. Schmitz
Summary: The rapid appearance of fossils of modern animal phyla during the Cambrian period is a significant characteristic of Earth's history of life. However, the precise dating of the start of the Cambrian period remains uncertain, leading to challenges to the concept of a discrete Cambrian explosion. New geochronological data from the Wood Canyon Formation in Nevada reveals that the base of the Cambrian period is at least 6 million years younger than previously thought, demonstrating an explosive pace to the early radiation of modern animal phyla when integrated with global records.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Multidisciplinary Sciences
Samuel L. Goldberg, Theodore M. Present, Seth Finnegan, Kristin D. Bergmann
Summary: By utilizing clumped and bulk isotope analyses of micritic carbonates, this study sheds light on the oxygen isotope information embedded in the Early Paleozoic geological records. With a large dataset and high resolution analyses, new insights into paleoclimate trends are obtained.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Engineering, Civil
Shengjie Wang, Liwei Wang, Mingjun Zhang, Yudong Shi, Catherine E. Hughes, Jagoda Crawford, Jinlong Zhou, Deye Qu
Summary: This study used a Bayesian three-component isotopic mixing model to analyze precipitation samples collected in the Kaxgar-Yarkant Oasis in central Asia. The study assessed the recycling ratio and contribution of transpiration to local precipitation, and found that plant transpiration plays a significant role in the local water cycle.
JOURNAL OF HYDROLOGY
(2022)
Article
Ecology
Franziska Slotta, Lukas Wacker, Frank Riedel, Karl-Uwe Heussner, Kai Hartmann, Gerhard Helle
Summary: The study established securely dated time series of annual wood increment growth and intra-ring stable isotopes for a baobab tree, examining their relationship to hydroclimate variability. It was found that the growth rings of the baobab tree exhibit annual character, with unique C-14 measurements providing precise dating. The study also revealed the influence of hydroclimate fluctuations on radial stem growth and the geochemistry of wood cellulose.
Article
Geosciences, Multidisciplinary
Dannell Quesada-Chacon, Klemens Barfus, Christian Bernhofer
Summary: One of the major obstacles for designing solutions against the imminent climate crisis is the scarcity of high spatio-temporal resolution model projections for variables such as precipitation. This study used deep-learning-based statistical downscaling methods to obtain daily 1 km resolution gridded data for precipitation in the Eastern Ore Mountains in Saxony, Germany. The introduced architectures show a clear performance improvement compared to previous statistical downscaling benchmarks.
GEOSCIENTIFIC MODEL DEVELOPMENT
(2022)
Article
Environmental Sciences
Emmie Le Roy, Wendell W. Walters, Emily E. Joyce, Meredith G. Hastings
Summary: National monitoring networks have reported an increase in ammonium (NH4+) deposition, dominating inorganic nitrogen deposition across most of the United States. Atmospheric deposition of fixed nitrogen has significant environmental consequences, including acidification and eutrophication. In the study site, long-range transport via in-cloud scavenging tended to play a stronger role in shaping w-NH4+ patterns.
ATMOSPHERIC ENVIRONMENT
(2021)
Article
Plant Sciences
Romain Lehnebach, Matteo Campioli, Jozica Gricar, Peter Prislan, Bertold Marien, Hans Beeckman, Jan Van den Bulcke
Summary: Understanding tree growth and carbon sequestration is crucial for predicting forest feedback to climate change. The study introduces a new method using high-resolution X-ray computed tomography (HRXCT) to study tree xylogenesis, which has shown high accuracy in estimating relevant parameters across different species and wood structures. HRXCT proves to be an efficient avenue to investigate tree xylogenesis for a wide range of wood anatomies, structures, and species.
FRONTIERS IN PLANT SCIENCE
(2021)
Article
Anthropology
Catherine G. Cooper, Martha D. Cooper, Michael P. Richards, Johanna Schmitt
Summary: Archaeologists often use carbon isotope data to study past climates, diets, and mobility patterns. This article examines the variations in 613C values of Arabidopsis thaliana plants grown in different sites across Europe and reveals that factors such as climate and geographic location significantly influence the 613C values.
JOURNAL OF ARCHAEOLOGICAL SCIENCE
(2023)
Article
Nutrition & Dietetics
Valisa E. Hedrick, Jamie M. Zoellner, A. Hope Jahren, Natalie A. Woodford, Joshua N. Bostic, Brenda M. Davy
JOURNAL OF NUTRITION
(2015)
Article
Public, Environmental & Occupational Health
Valisa E. Hedrick, Brenda M. Davy, Grace A. Wilburn, A. Hope Jahren, Jamie M. Zoellner
PUBLIC HEALTH NUTRITION
(2016)
Article
Biochemical Research Methods
Joshua N. Bostic, Sherilyn J. Palafox, Marina E. Rottmueller, A. Hope Jahren
RAPID COMMUNICATIONS IN MASS SPECTROMETRY
(2015)
Article
Biochemical Research Methods
William M. Hagopian, Brian A. Schubert, A. Hope Jahren
RAPID COMMUNICATIONS IN MASS SPECTROMETRY
(2015)
Review
Endocrinology & Metabolism
Brenda Davy, Hope Jahren
CURRENT OPINION IN CLINICAL NUTRITION AND METABOLIC CARE
(2016)
Article
Public, Environmental & Occupational Health
Brenda M. Davy, A. Hope Jahren, Valisa E. Hedrick, Wen You, Jamie M. Zoellner
PUBLIC HEALTH NUTRITION
(2017)
Article
Geology
Brian A. Schubert, A. Hope Jahren, Sergei P. Davydov, Sophie Warny
Article
Ecology
M. Timothy Rabanus-Wallace, Matthew J. Wooller, Grant D. Zazula, Elen Shute, A. Hope Jahren, Pavel Kosintsev, James A. Burns, James Breen, Bastien Llamas, Alan Cooper
NATURE ECOLOGY & EVOLUTION
(2017)
Review
Chemistry, Analytical
A. Hope Jahren, Joshua N. Bostic, Brenda M. Davy
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2014)
Article
Biochemistry & Molecular Biology
Argelia Cuenca, Gitte Petersen, Ole Seberg, Anne Hoppe Jahren
JOURNAL OF MOLECULAR EVOLUTION
(2012)
Article
Nutrition & Dietetics
Tala H. I. Fakhouri, A. Hope Jahren, Lawrence J. Appel, Liwei Chen, Reza Alavi, Cheryl A. M. Anderson
JOURNAL OF NUTRITION
(2014)
Article
Nutrition & Dietetics
Brenda M. Davy, A. Hope Jahren, Valisa E. Hedrick, Dana L. Comber
JOURNAL OF THE AMERICAN DIETETIC ASSOCIATION
(2011)
Article
Biochemical Research Methods
D. Caleb King, Brian A. Schubert, A. Hope Jahren
RAPID COMMUNICATIONS IN MASS SPECTROMETRY
(2012)
Article
Biochemical Research Methods
William M. Hagopian, A. Hope Jahren
RAPID COMMUNICATIONS IN MASS SPECTROMETRY
(2012)
Article
Multidisciplinary Sciences
Brian A. Schubert, A. Hope Jahren
NATURE COMMUNICATIONS
(2013)
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)