Results 21 to 30 of about 23,012 (263)

The Integrated Use of Dendrochronological Data and Paleoecological Records From Northwest European Peatlands and Lakes for Understanding Long-Term Ecological and Climatic Changes—A Review

Frontiers in Ecology and Evolution, 2022
Our overall understanding of long-term climate dynamics is largely based on proxy data generated from archives such as ice cores, ocean sediments, tree rings, speleothems, and corals, whereas reconstructions of long-term changes in vegetation and ...
Johannes Edvardsson, Samuli Helama, Mats Rundgren, Anne Birgitte Nielsen   +3 more
doaj   +1 more source

Data supporting Maastrichtian paleoclimate variables applying a multi proxy approach to a paleosol profile, Arctic Alaska

Data in Brief, 2020
We provide the dataset of climate variables related to the research article “Paleoclimate reconstruction of the Prince Creek Formation, Arctic Alaska, during Maastrichtian global warming” [1].
Susana Salazar-Jaramillo, Paul J. McCarthy, Andrés Ochoa, Sarah J. Fowell, Fred J. Longstaffe   +4 more
doaj   +1 more source

Paleobotanical proxies for early Eocene climates and ecosystems in northern North America from middle to high latitudes [PDF]

Climate of the Past, 2020
Early Eocene climates were globally warm, with ice-free conditions at both poles. Early Eocene polar landmasses supported extensive forest ecosystems of a primarily temperate biota but also with abundant thermophilic elements, such as crocodilians, and ...
C. K. West, D. R. Greenwood, T. Reichgelt, A. J. Lowe, J. M. Vachon, J. F. Basinger   +5 more
doaj   +1 more source

Defining a proxy for the interpretation of seismic anisotropy in non‐Newtonian mantle flows [PDF]

Geophysical Research Letters, 2014
AbstractSeismic anisotropy can provide unique insights on convection in the upper mantle. Here we study the link between seismic anisotropy and mantle flow using a non‐Newtonian rheology consistent with deformation by dislocation creep. Using analytical first‐order flow models underneath a ridge and in subduction zones, we find that finite strain ...
Hedjazian, N., Kaminski, E.
openaire   +2 more sources

A continental reconstruction of hydroclimatic variability in South America during the past 2000 years [PDF]

Climate of the Past
Paleoclimatological field reconstructions are valuable for understanding past hydroclimatic variability, which is crucial for assessing potential future hydroclimate changes.
M. A. Choblet, M. A. Choblet, M. A. Choblet, J. C. Bühler, V. F. Novello, N. J. Steiger, N. J. Steiger, K. Rehfeld   +7 more
doaj   +1 more source

Assessing the Validity of Negative High Field Strength-Element Anomalies as a Proxy for Archaean Subduction: Evidence from the Ben Strome Complex, NW Scotland

Geosciences, 2018
The relative depletion of high field strength elements (HFSE), such as Nb, Ta and Ti, on normalised trace-element plots is a geochemical proxy routinely used to fingerprint magmatic processes linked to Phanerozoic subduction.
George L. Guice, Iain McDonald, Hannah S. R. Hughes, Denis M. Schlatter, Kathryn M. Goodenough, John M. MacDonald, John W. Faithfull   +6 more
doaj   +1 more source

Use of Proxy Indicators to Interpret the Epi Curve of COVID-19 in Sri Lanka [PDF]

International Journal of Community Resilience, 2021
Sri Lanka has taken measures to avoid the introduction and spread of COVID-19 well before the country confirmed its first COVID 19 case on 27th January 2020, on top of its detailed epidemiological surveillance and infectious disease control system. Traditional indicators such as the daily case numbers have been used as an indicator to keep track of the
IM Karunathilake, WMPC Weerasinghe, R. Rupasinghe, MC Weerasinghe   +3 more
openaire   +1 more source

Electron flux is a key determinant of uranium isotope fractionation during bacterial reduction

Communications Earth & Environment, 2023
Uranium isotopic signatures in the rock record are utilized as a proxy for past redox conditions on Earth. However, these signatures display significant variability that complicates the interpretation of specific redox conditions. Using the model uranium-
Ashley R. Brown, Margaux Molinas, Yvonne Roebbert, Ataru Sato, Minori Abe, Stefan Weyer, Rizlan Bernier-Latmani   +6 more
doaj   +1 more source

Influence of regional precipitation patterns on stable isotopes in ice cores from the central Himalayas [PDF]

The Cryosphere, 2014
Several ice cores have been recovered from the Dasuopu (DSP) Glacier and the East Rongbuk (ER) Glacier in the central Himalayas since the 1990s. Although the distance between the DSP and the ER ice core drilling sites is only ~ 125 km, the stable ...
H. Pang, S. Hou, S. Kaspari, P. A. Mayewski   +3 more
doaj   +1 more source

The response of ENSO flavors to mid‐Holocene climate: Implications for proxy interpretation [PDF]

Paleoceanography, 2015
AbstractThe response of El Niño–Southern Oscillation (ENSO) to mid‐Holocene boundary conditions remains an open question: paleoclimate proxies and climate model simulations do not agree in the magnitude of the reduction of ENSO variability, while recent proxy evidence from fossil corals from the central Pacific show that the reduction in mid‐Holocene ...
Christina Karamperidou, Pedro N. Di Nezio, Axel Timmermann, Fei‐Fei Jin, Kim M. Cobb   +4 more
openaire   +1 more source