Results 51 to 60 of about 25,230 (195)

δ18O of atmospheric oxygen measured on the GRIP Ice Core Document Stratigraphic disturbances in the lowest 10% of the core [PDF]

, 1996
δ18O measured on oxygen in the bubble air from ice cores is a proxy for continental ice volume and is used to synchronize cores from Greenland and Antarctica.
Fuchs, Andreas, Leuenberger, Markus C.
core   +1 more source

Geochronological reconstruction of the Lateglacial deglaciation in the Arve Valley (Northern French Alps)

Journal of Quaternary Science, EarlyView.
ABSTRACT The timing and spatial patterns of glaciers retreat in the Northern French Alps during the Lateglacial (19.0–11.7 ka) remain debated, reflecting discrepancies among available chronological data sets. The complex interactions between major glaciers, such as the Rhône and Arve glaciers to the north and the Isère glacier to the south, represent a
Quentin Portal, Christian Crouzet, Jean‐François Buoncristiani, Julien Carcaillet   +3 more
wiley   +1 more source

Data-model comparison of soil–water δ18O at a temperate site in N. Spain with implications for interpreting speleothem δ18O [PDF]

, 2015
An understanding of how seasonal and longer-term δ18O signals in meteoric precipitation (δ18Op) are modified by percolation through soils is essential to link temporal changes in speleothem δ18O to surface climatic conditions.
McDermott, Frank, Comas-Bru, Laia
core   +1 more source

Tracing fluid transfers in subduction zones: an integrated thermodynamic and δ18O fractionation modelling approach [PDF]

, 2020
Oxygen isotope geochemistry is a powerful tool for investigating rocks that interacted with fluids, to assess fluid sources and quantify the conditions of fluid–rock interaction. We present an integrated modelling approach and the computer program PTLoop
Vho, Alice, Hermann, Jörg, Lanari, Pierre, Rubatto, Daniela   +3 more
core   +2 more sources

Dental enamel hypoplasia and intra‐tooth isotope records as indicators of physiological stress and environmental variability in Early Pleistocene hippopotamids from Melka Kunture (Upper Awash, Ethiopia)

Journal of Quaternary Science, EarlyView.
ABSTRACT Enamel hypoplasia results from temporary disruptions of enamel deposition during tooth development. It is widely used as an indicator of physiological stress in archeological and paleontological contexts; yet, its relationship with environmental conditions during tooth formation remains poorly constrained.
Giuseppe Briatico, Denis Geraads, Rita T. Melis, Margherita Mussi   +3 more
wiley   +1 more source

Responses of primary producers, anoxia, and chemical feedback to Late Glacial climate change: Insights from a paired lake approach

Journal of Quaternary Science, EarlyView.
Abstract Worldwide, lacustrine ecosystems are threatened by eutrophication and deoxygenation. Both processes are driven by the combined effects of human activities and climate change. Understanding the pre‐anthropogenic nexus between warming, eutrophication, deoxygenation, and related feedback is essential to determine how lakes respond to rapid ...
Noé R.M.M. Schmidhauser, Stan J. Schouten, Petra Zahajská, Andrea Lami, Jacqueline F.N. van Leeuwen, Rik Tjallingii, Hendrik Vogel, Martin Grosjean   +7 more
wiley   +1 more source

South Atlantic Multi‐Site Calibration of Coral Oxygen Isotope Paleothermometer

Geochemistry, Geophysics, Geosystems
Coral‐based stable oxygen isotopes (δ18O) have been used as a proxy for sea surface temperature (SST) since the 1970s, and δ18O–SST calibration studies have been fundamental to assure robust and faithful SST reconstructions.
N. S. Pereira, C. M. Chiessi, S. Crivellari, K. H. Kilbourne, R. K. P. Kikuchi, B. P. Ferreira, R. J. A. Macêdo, M. C. M. dosSantos, M. G. Pereira, L. S. Neves da Rocha, A. N. Sial   +10 more
doaj   +1 more source

Fish without water: Validation and application of δ18O in Totoaba macdonaldi otoliths

Ciencias Marinas, 2008
The geochemistry of fish otoliths is a valuable tool for reconstructing environmental conditions, migrations and life histories. In this study we validate the relationship between temperature, the water oxygen isotope composition (δ18O) and otolith δ18O
K Rowell, C True, KW Flessa, DL Dettman
doaj   +1 more source

Influence of thermochemical sulfate reduction on oxygen isotopic composition of calcite cements in carbonates of the Triassic Feixianguan and Permian Changxing formations in the Sichuan Basin, China

Frontiers in Earth Science, 2023
Calcite cement is a common diagenetic mineral in carbonate rocks and plays an important role on rock quality as hydrocarbon reservoirs. Traditionally, oxygen isotopic compositions (δ18O) of the diagenetic calcites tend to decrease with increasing depths ...
Guangwei Wang, Guangwei Wang, Fang Hao, Fang Hao, Huayao Zou, Pingping Li   +5 more
doaj   +1 more source

Determining the Optimal Water Storage Depth of Apple Orchards in the Chinese Loess Plateau: Balancing Soil Desiccation Mitigation, Plant Utilization, and Engineering Construction

Land Degradation &Development, EarlyView.
ABSTRACT Deep‐rooted plantations are central to dryland ecological restoration, yet their long‐term cultivation drives widespread deep soil desiccation, threatening ecosystem sustainability. While artificial water replenishment is a key deep soil desiccation mitigation strategy, the depth‐dependent positional effect of stored water on eco‐hydrological ...
Haoyan Wei, Xuguang Zhang, Yanwei Lu, Sk Shamshul Alam Kamar, Hailong He, Xia Wang, Min Li   +6 more
wiley   +1 more source