Article
Geochemistry & Geophysics
Mengyuan Wang, Huanye Wang, Zhixin Zhu, Xiaoqiang Yang, Ke Zhang, Yancheng Zhang, Weiguo Liu, Zhuo Zheng, Yongqiang Zong, Zhonghui Liu
Summary: Research indicates that the evolution of Asian Summer Monsoon (ASM) during the Late Miocene and Pliocene experienced three phases: weak ASM strength around 6.5-5.6 million years ago, significantly enhanced strength between 5.6-4.3 million years ago, and a slightly reduced but strengthening trend after 4.3 million years ago. The study reveals a close relationship between ASM strength and tropical temperature, suggesting a developing influence of Walker Circulation on ASM strength during the Late Pliocene.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geography, Physical
Shubham Tripathi, Manish Tiwari, Padmasini Behera
Summary: The variability of the South Asian Monsoon and its forcing factors during the Mid-Pleistocene Transition are not fully understood. This study presents a multiproxy record from the eastern Arabian Sea, showing the variability of productivity and denitrification related to the South Asian Monsoon during this transition period. The results indicate that the South Asian Monsoon fluctuated during different phases of the Mid-Pleistocene Transition, and its long-term variability aligns with the glacial-interglacial cycles.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Padmasini Behera, Manish Tiwari, Vikash Kumar, T. Sarathchandraprasad, Shubham Tripathi
Summary: This study reveals the variability and influencing factors of the South Asian monsoon during the late Pliocene through analyzing multi-proxy high-resolution records. It is found that Arctic sea ice extent plays a significant role in the monsoon variability, affecting its intensity through modulating jet stream flow and meridional circulation. Furthermore, the results support model predictions that South Asia will experience more intense precipitation with continued climate warming.
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2022)
Article
Geography, Physical
Raj S. I. S. Podder, Anil K. Gupta, Steven Clemens
Summary: The surface hydrography of the Tropical Eastern Indian Ocean is influenced by seasonal wind reversals, affecting thermocline depth, mixed layer thickness, and sea surface temperature. These changes are driven by the Indian Summer Monsoon and the weakening of the monsoon after 3.4 Ma, leading to fluctuations in surface productivity and changes in heat budget capacity.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2021)
Article
Geography, Physical
T. Sarathchandraprasad, Manish Tiwari, Padmasini Behera
Summary: This study highlights the intensification and weakening of the South Asian Summer Monsoon during interglacials and glacials of the mid-Piacenzian Warm Period, and a shift to a higher mean state at 2.95 million years ago possibly due to tectonic induced reorganization of the Indonesian Throughflow. Orbital parameters like eccentricity are found to have control over the SASM variations during the late Piacenzian according to spectral and wavelet transform analysis.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2021)
Article
Multidisciplinary Sciences
Hong Ao, Eelco J. Rohling, Ran Zhang, Andrew P. Roberts, Ann E. Holbourn, Jean-Baptiste Ladant, Guillaume Dupont-Nivet, Wolfgang Kuhnt, Peng Zhang, Feng Wu, Mark J. Dekkers, Qingsong Liu, Zhonghui Liu, Yong Xu, Christopher J. Poulsen, Alexis Licht, Qiang Sun, John C. H. Chiang, Xiaodong Liu, Guoxiong Wu, Chao Ma, Weijian Zhou, Zhangdong Jin, Xinxia Li, Xinzhou Li, Xianzhe Peng, Xiaoke Qiang, Zhisheng An
Summary: Our research suggests that the warming during the Miocene-Pliocene boundary increased summer monsoon moisture transport over East Asia, while also leading to aridification in Central Asia through increased evaporation. Additionally, high-resolution monsoon records indicate a dynamic response to eccentricity modulation of solar insolation with periodicities of around 405,000 years and approximately 100,000 years between 8.1 and 3.4 million years ago.
NATURE COMMUNICATIONS
(2021)
Article
Geography, Physical
Hua Feng, Jun Tian, Mitch Lyle, Thomas Westerhold, Roy Wilkens
Summary: The western equatorial Pacific plays a crucial role in understanding global climate change and its evolution over geological time. However, there is a lack of continuous paleoceanographic records with high time resolution and accurate age models in this important ocean region. This study presents a high time resolution record of benthic foraminiferal delta O-18 and delta C-13 from the western equatorial Pacific and establishes an accurate age model for the past 5.025 million years. The results reveal the dominance of water aging effects in the region since the Pliocene and highlight the complex interplay between high and low latitude climatic processes on deep Pacific circulation changes.
GLOBAL AND PLANETARY CHANGE
(2022)
Article
Geography, Physical
Joan Daura, Montserrat Sanz, Martina Demuro, Lee J. Arnold, Ana Maria Costa, Joao Moreno, Maria da Conceicao Freitas, Vera Lopes, Natalia Eguez, Dirk L. Hoffmann, Alexa Benson, Dan Cabanes, Joan Garcia-Targa, Josep Maria Fullola
Summary: The study provides a comprehensive chronological framework for the Cova del Gegant site using multiple radiometric dating techniques, sedimentological and micromorphological analyses, and Bayesian modeling. The results divide the sequence into three sections covering the Middle Palaeolithic, Chatelperronian/Aurignacian, and Late Aurignacian/Gravettian periods. The chronological framework aligns with that reported for other Middle and Upper Palaeolithic sites in northeastern Iberian Peninsula, indicating successive human occupation coinciding with global cooling and lowering sea levels.
QUATERNARY SCIENCE REVIEWS
(2021)
Article
Geosciences, Multidisciplinary
Ze Zhang, Alexis Licht, David De Vleeschouwer, Zhixiang Wang, Yanzhen Li, David B. Kemp, Liangcheng Tan, Rui Zhang, Xiaoke Qiang, Chunju Huang
Summary: Sedimentary archives from the Mio-Pliocene and Pleistocene periods in NE Tibet show a different response to orbital forcing. While the Mio-Pliocene records demonstrate a monotonic response dominated by eccentricity, the Pleistocene records display a more stochastic response that varies regionally and temporally. The transition between these two responses is attributed to the increase in Northern Hemisphere ice volume, leading to a decreased monsoonal rainfall in the late Pliocene and a heightened response to obliquity and climate stochasticity.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Timothy D. Herbert, Rocio Caballero-Gill, Joseph B. Novak
Summary: The composite section from ODP Site 846 has provided important data for Pliocene stable isotope and paleoclimatic time series, revealing outliers in previously published datasets. By using high-resolution core measurements and integrating new stable isotopic and alkenone data, a revised sequence across the M2 event has been generated and correlated well with other datasets, leading to the proposal of a new composite splice for Site 846 that should be included in revised Pliocene paleoclimatic stacks.
CLIMATE OF THE PAST
(2021)
Article
Geography, Physical
Anne-Marie Ballegeer, Jose A. Flores, Francisco J. Sierro, Andres S. Rigual-Hernandez
Summary: In this study, calcareous nannofossil assemblages and fragmentation ratios of two coccolithophore species were analyzed to study the paleoceanographic evolution and carbonate preservation trends in the South Atlantic during the late Pliocene and Early Pleistocene. The results revealed shifts in the assemblages and preservation patterns correlated with climatic changes, suggesting the influence of water column mixing and the position of the Subtropical Front. The study also observed consistency between fragmentation ratios and oxygen isotope records.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Geosciences, Multidisciplinary
D. Heslop, U. Amarathunga, E. J. Rohling
Summary: In this study, a regression-based deconvolution method was used to estimate the combination of freshwater runoff and surface warming of the water column in the eastern Mediterranean over the past 5 million years. The analysis revealed the consistent influence of orbital eccentricity in modulating the North African monsoon and a possible shift in runoff source area. These findings provide important insights into the role of the North African monsoon in shaping Mediterranean environmental changes.
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2023)
Article
Geochemistry & Geophysics
Robert S. Feranec, Mario E. Cournoyer, Andrew L. Kozlowski
Summary: This study uses radiocarbon dating and stable isotope analyses on vertebrate specimens from the late Pleistocene to early Holocene Champlain Sea, focusing on the timing of colonization and ecological dynamics in this newly formed sea. The isotopic data reveal differences in prey consumption among different species, with some consuming prey from lower trophic levels and others consuming fish, similar to modern arctic marine ecosystems.
Article
Meteorology & Atmospheric Sciences
Zhixiang Wang, Yongdong Mao, Rui Zhang, David B. Kemp, Chunju Huang
Summary: This study investigates the hydrological cycle in Northern China during the Pliocene using a continuous cyclostratigraphic record. The results show that the hydrological cycling in the region was controlled by long and short orbital eccentricity. The expansion of the Antarctic ice sheet and the orbital configuration around 4.2-4.4 Ma may have contributed to the strengthening of the East Asian summer monsoon.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Geography, Physical
Polina Vakhrameeva, Andreas Koutsodendris, Sabine Wulf, Maxim Portnyagin, Oona Appelt, Thomas Ludwig, Mario Trieloff, Joerg Pross
Summary: This study analyzed tephra layers in the Eastern Mediterranean region to establish correlations between terrestrial and marine records, revealing multiple volcanic layers and providing important clues and rich data for the study of regional climate change.
QUATERNARY SCIENCE REVIEWS
(2021)
Article
Forestry
Li Qin, Yujiang Yuan, Huaming Shang, Shulong Yu, Weiping Liu, Ruibo Zhang
Article
Meteorology & Atmospheric Sciences
Ruibo Zhang, Bakytbek Ermenbaev, Heli Zhang, Huaming Shang, Tongwen Zhang, Shulong Yu, Dogdurbek Toktosartovich Chontoev, Rysbek Satylkanov, Li Qin
Article
Geochemistry & Geophysics
Annika Greve, Myriam Kars, Mark J. Dekkers
Summary: Understanding the locus of fluid flow along thrust and splay faults is crucial for comprehending the hydraulic properties of accretionary systems and fault mechanics. In this study, rock magnetic techniques were used to identify enhanced magnetic mineral alteration within the Papaku fault, revealing changes within the main brittle fault zones and subsidiary fault zones. The secondary magnetic mineral diagenesis was likely driven by anaerobic methane oxidation, with sediments acting as a barrier to prevent upward fluid flow through the fault zone.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Editorial Material
Geochemistry & Geophysics
Isabelle Manighetti, Rachel E. Abercrombie, Yehuda Ben-Zion, Yves Bernabe, Michael Bostock, Mark J. Dekkers, Stephen W. Parman, Doug Schmitt, Paul Tregoning
Summary: The editors of JGR: Solid Earth require Plain Language Summaries for all manuscripts.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
N. Garcia-Redondo, M. Calvo-Rathert, A. Carrancho, A. Goguitchaichvili, E. Iriarte, A. Blanco-Gonzalez, M. J. Dekkers, J. Morales-Contreras, C. Alario-Garcia, C. Macarro-Alcalde
Summary: This study reports an archeomagnetic analysis of an Early Iron Age archaeological site in Salamanca, Spain, aiming to determine the last use of a central fireplace and retrieve information about the Earth's magnetic field in Western Europe during a period associated with the Levantine Iron Age Anomaly. The results show a high paleointensity near the peak observed in Iberia at this age, confirming the existence of this peak related to the LIAA in Western Europe. The study provides important insights into the magnetic history of the region during the Iron Age.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Review
Geochemistry & Geophysics
Zhaoxia Jiang, Qingsong Liu, Andrew P. Roberts, Mark J. Dekkers, Vidal Barron, Jose Torrent, Sanzhong Li
Summary: Hematite is a common canted antiferromagnetic mineral with a reddish color. Its identification and quantification can be conveniently achieved through magnetic and color properties. Understanding hematite's characteristics and content is crucial for studies of the iron cycle, paleoenvironmental evolution, and research on Mars. However, previous research mainly focuses on stoichiometric hematite, neglecting the effects of cation substitution. Remagnetization is another complex problem associated with hematite. Recognizing the properties of cation-substituted hematite and understanding remagnetization mechanisms are important for identifying and interpreting the magnetic signals carried by hematite.
REVIEWS OF GEOPHYSICS
(2022)
Article
Meteorology & Atmospheric Sciences
Li Qin, Kainar Bolatov, Huaming Shang, Shulong Yu, Xiaohua Gou, Maisupova Bagila, Aigerim Bolatova, Utebekova Ainur, Ruibo Zhang
Summary: Alpine snowfall is a crucial water source for arid areas, and there has been a significant increase in snowfall in the southern Kazakhstan region over the past 166 years.
THEORETICAL AND APPLIED CLIMATOLOGY
(2022)
Article
Forestry
Li Qin, Kainar Bolatov, Yujiang Yuan, Huaming Shang, Shulong Yu, Tongwen Zhang, Maisupova Bagila, Aigerim Bolatova, Ruibo Zhang
Summary: The research found that snow has an important impact on the radial growth of Schrenk spruce in the Ili-Balkhash Basin in Central Asia, influenced by precipitation. The response to snow varies spatially and is mainly determined by the amount of precipitation in each region.
Editorial Material
Geochemistry & Geophysics
Isabelle Manighetti, Rachel Abercrombie, Yehuda Ben-Zion, Yves Bernabe, Michael Bostock, Mark J. Dekkers, Satoshi Ide, Stephen W. Parman, Douglas R. Schmitt, Paul Tregoning
Summary: The editors of JGR-Solid Earth express their appreciation to those who served as peer reviewers for the journal in 2021.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Agronomy
Li Qin, Kexiang Liu, Huaming Shang, Tongwen Zhang, Shulong Yu, Ruibo Zhang
Summary: Schrenk spruce is a unique tree species in arid Central Asia, and its radial growth at the alpine timberline is mainly limited by the mean minimum temperature during the growing season. Over the past 60 years, the limiting effect of temperature on radial growth has been significant and stable, while the influence of precipitation has increased due to rapid warming. Continued warming may further complicate the response of Schrenk spruce radial growth to climate at the timberline in arid Central Asia.
AGRICULTURAL AND FOREST METEOROLOGY
(2022)
Article
Geochemistry & Geophysics
Tao Yang, Mark J. Dekkers, Xixi Zhao, Katerina E. Petronotis, Yu-Min Chou
Summary: This study provides insights into a novel pathway of greigite formation controlled by turbidites and bioturbation. The research also suggests that early diagenetic greigite can preserve primary (quasi-)syn-sedimentary magnetic records.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geosciences, Multidisciplinary
Liao Chang, Zhaowen Pei, Pengfei Xue, Shishun Wang, Zhaoping Wang, Wout Krijgsman, Mark J. J. Dekkers
Summary: This study investigates the origin of multipolarity in Miocene greigite-bearing sediments using electron microscopic and magnetic analyses. It is found that there is a magnetic softening and partial transformation of iron sulfides to magnetite and pyrrhotite in the sediments, leading to the change from single polarity to multipolarity. A new greigite self-reversal model is proposed to explain the commonly observed antiparallel polarities, which has significant implications in geochronology, tectonics, and paleoenvironment.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geochemistry & Geophysics
Wentao Huang, Shanshan Niu, Mark J. Dekkers, Peter C. Lippert, Dario Bilardello, Peat Solheid, Bo Zhang, Guillaume Dupont-Nivet, Douwe J. J. van Hinsbergen, Lin Ding
Summary: Paleomagnetic investigations of Paleocene lavas from Dianzhong Formation in Linzhou basin of southern Lhasa terrane are essential for determining the timing and paleolatitude of the initial India-Asia collision. However, controversy exists regarding the preservation of primary remanent magnetization in these rocks. This study finds that hydrothermal alteration has significantly impacted the original magnetic carrier, resulting in the contamination or replacement of the primary remanence by thermoviscous and chemical remanent magnetizations.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geochemistry & Geophysics
Mark J. Dekkers, Wout Hanckmann, Simo Spassov, Thilo Behrends
Summary: Siderite is an important sink for iron in the geochemical cycling of iron, but its detection is challenging due to its fine-grained nature and low concentrations. This study explores the potential of low-temperature magnetometry for analyzing siderite. The results show that the presence of siderite can be best diagnosed by evaluating a combination of heating curves and the remanence ratio.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2023)
Editorial Material
Geochemistry & Geophysics
Isabelle Manighetti, Rachel Abercrombie, Yves Bernabe, Michael Bostock, Mark J. Dekkers, Satoshi Ide, Douglas R. Schmitt, Shin-Chan Han, Paul Tregoning
Summary: The editors of JGR-Solid Earth express their gratitude to the peer reviewers who contributed in reviewing articles for the journal in 2022.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)