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isotopes

A long cylinder of ice on a table
Posted inNews

Ice Cores Record Long-Ago Seasons in Antarctica

by Caroline Hasler 17 March 202320 March 2023

Researchers used ice core data to reconstruct seasonal temperatures throughout the Holocene. The results link especially hot summers with patterns in Earth’s orbit.

Two maps that show the pre-monsoon precipitation and monsoon precipitation.
Posted inEditors' Highlights

Source of Precipitation Moisture Feeding Himalayan Rivers

by Tissa Illangasekare 17 February 202314 March 2023

Isotope study showing the partitioning of moisture into snow, ice, and groundwater allows an understanding of the relative contribution to river flow to show where Himalayan river water comes from.

Photo of a sample under a microscope
Posted inEditors' Vox

Rare and Revealing: Radiocarbon in Service of Paleoceanography

by Luke C. Skinner and Edouard Bard 7 February 20237 February 2023

While radiocarbon is best known as a dating tool, this rare isotope can also provide unique and wide-ranging insights into the cycling of carbon in the Earth system.

这幅森林场景描绘了几棵铁杉树的底部,其根部暴露在外
Posted inResearch Spotlights

用木质部估算植物用水量

by Sarah Derouin 31 January 202321 March 2023

一项新研究表明,来自植物木质部的化学同位素可以帮助改善森林水循环的表征。

A forest scene depicts the base of several hemlock trees with their roots exposed.
Posted inResearch Spotlights

To Estimate Plant Water Use, Consider the Xylem

by Sarah Derouin 13 January 202331 January 2023

New research shows that chemical isotopes from plant xylem can improve representations of the forest water cycle.

Two graphs from the paper.
Posted inEditors' Highlights

Clumped 18O –18O in Ice Reveals Past Ozone and Wildfire

by Sarah Feakins 9 December 20227 December 2022

Reactive gases like ozone are hard to preserve, but clumped isotopes and models provide clues to past ozone and suggest a global increase in wildfire at megafaunal extinction.

diagram of a subduction zone
Posted inEditors' Highlights

Tracing Oxidizing Slab Fluids in Cold Volcanic Arcs

by Susanne Straub 28 October 202215 November 2022

Elevated copper isotope ratios in arc magmas from fluid-rich cold subduction zones support the role of oxidizing fluids from the subducted lithospheric serpentinite in the oxidization of arc magmas.

Comparison of the range of lithium isotopic ratios measured in this work at the Bisley 1 catchment in Puerto Rico with those previously published.
Posted inEditors' Highlights

Extreme Lithium Isotope Fractionations During Intense Weathering

by Lixin Jin 18 April 202221 December 2022

Extreme lithium fractionation is observed when primary minerals in andesite are transformed to secondary clay minerals and then to oxides with intensive chemical weathering in a tropical climate.

英国布里斯托动物园一种未知树种的生长年轮图片
Posted inResearch Spotlights

树木年轮显示了最新发现的极端太阳活动事件记录

by Morgan Rehnberg 11 August 202121 February 2023

对树木年轮物质的光谱分析表明,碳-14浓度在一年内急剧上升,这与发生在公元前5410年左右的极端太阳高能粒子事件相一致。

A picture showing the growth rings of an unknown tree species at Bristol Zoo in the United Kingdom
Posted inResearch Spotlights

Tree Rings Show Record of Newly Identified Extreme Solar Activity Event

by Morgan Rehnberg 12 July 202121 February 2023

Mass spectroscopy of tree ring material indicates a sharp, single-year rise in carbon-14 concentrations consistent with an extreme solar energetic particle event that occurred around 5410 BCE.

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Features from AGU Journals

RESEARCH SPOTLIGHTS
Earth’s Future
“How to Build a Climate-Resilient Water Supply”
By Rachel Fritts

EDITORS' HIGHLIGHTS
AGU Advances
“How Do Atmospheric Rivers Respond to Extratropical Variability?”
By Sarah Kang

EDITORS' VOX
Reviews of Geophysics
“Rare and Revealing: Radiocarbon in Service of Paleoceanography”
By Luke C. Skinner and Edouard Bard

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