Results 171 to 180 of about 3,020 (234)

Local Variability of Ice Core Ammonium and Black Carbon Records From Tunu and Summit, Greenland: Implications for Long‐Term Biomass Burning Reconstructions

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 14, 28 July 2026.
Abstract Paleoclimate reconstructions of wildfire using ice cores often rely on high‐resolution aerosol records of refractory black carbon (rBC) or ammonium (NH4+). The interpretation of such records, however, can be hindered by uncertainties related to long‐range atmospheric transport, spatial distribution and strength of emissions, as well as ...
Drake McCrimmon, Nathan Chellman, Sophia Wensman, Andreas Plach, Joseph R. McConnell   +4 more
wiley   +1 more source

Copper isotope shifts in biofluids track Alzheimer's pathology. [PDF]

Alzheimers Dement (Amst)
Lahoud E, Moynier F, Mahan B, Luu TH, Rigoussen D, Le Borgne M, Paquet C, Fowler C, Bush AI.   +8 more
europepmc   +1 more source

Isotopic evidence for volatile loss driven by South Pole-Aitken basin-forming impact. [PDF]

Proc Natl Acad Sci U S A
Tian HC, Zhang C, Li WJ, Xue D, Wang J, Yang W, Liu YH, Lin Y, Li XH, Wu FY.   +9 more
europepmc   +1 more source

Mass spectrometry measurements of mercury isotope ratios support geochemical sourcing of archaeological cinnabar in the Andean region. [PDF]

PLoS One
Young M, Cooke C, Burger R, Kaplan E, Prieto G, Bongers J, Dalton J, Usama F, Yuan S, Hintelmann H.   +9 more
europepmc   +1 more source

The barite record of the past seawater oxygen isotope composition. [PDF]

Nat Commun
Han T, Bao H, Peng Y, Lu Z, Song Y.
europepmc   +1 more source

Sulfur Isotopes Reveal Spatial Variation in Waterbird Trace Element Contamination from Tropical Estuaries to the Open Ocean. [PDF]

Environ Sci Technol
Linhares BA, Bustamante P, Nunes GT, Costa PG, Bugoni L, Zebral YD, Orselli IBM, Martins CMG, Bianchini A.   +8 more
europepmc   +1 more source

Volatilized Ammonia Supports Subterranean Ecosystems with Unusual Nitrogen Isotopic Signatures. [PDF]

Environ Sci Technol
Best MB, Wankel SD, Graham HV, Stern JC, Macalady J, Mainiero M, Recanatini S, Mariani S, D'Angeli I, Vaccarelli I, Jones DS.   +10 more
europepmc   +1 more source

An expansive global oxygenation of Earth's surface environments 1.4 billion years ago. [PDF]

Nat Commun
Yan H, Qin Z, Xu L, Mao J, Tang D, Huang Q, Yang X, Li Z, Li J, Li L, Robbins LJ, Kendall B, Canfield DE, Konhauser KO.   +13 more
europepmc   +1 more source

Abundance-activity decoupling in sulfur-cycling bacteria reflects viral infection types in meromictic lakes

Walker JR, Varona NS, Wallace BA, Aguilar A, O’Beirne MD, Werne JP, Luque A, Gilhooly WP, Bosco-Santos A, Silveira CB.   +9 more
europepmc   +1 more source

Regional postdeforestation weathering feedback drove diachronous C-S cycle perturbations during the end-Permian crisis. [PDF]

Proc Natl Acad Sci U S A
Chen J, Lu B, Du L, Lin M, Shen SZ, Montañez IP, Feng Z.   +6 more
europepmc   +1 more source