Sarah Aarons

Sarah Aarons
University of California, San Diego | UCSD

PhD

About

32
Publications
4,078
Reads
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364
Citations
Additional affiliations
January 2013 - April 2016
University of Michigan
Position
  • PhD Student

Publications

Publications (32)
Article
Full-text available
Dust provides an ecologically significant input of nutrients, especially in slowly eroding ecosystems where chemical weathering intensity limits nutrient inputs from underlying bedrock. In addition to nutrient inputs, incoming dust is a vector for dispersing dust-associated microorganisms. While little is known about dust-microbial dispersal, dust...
Article
Full-text available
The formation of continental crust via plate tectonics strongly influences the physical and chemical characteristics of Earth’s surface and may be the key to Earth’s long-term habitability. However, continental crust formation is difficult to observe directly and is even more difficult to trace through time. Nontraditional stable isotopes have yiel...
Article
Recent work has demonstrated that titanium (Ti) isotopes undergo mass-dependent isotope fractionation during magmatic differentiation, leaving evolved silicic melts preferentially enriched in heavy Ti isotopes. Preferential incorporation of light Ti isotopes in crystallizing Fe-Ti oxides is thought to be the mechanism responsible for this fractiona...
Article
Interpreting isotopic signatures documented in natural rocks requires knowledge of equilibrium isotopic fractionation factors. Here, we determine equilibrium Fe isotope fractionation factors between several common rock-forming minerals using a comparative approach involving three independent methods: (i) isotopic analyses of natural minerals from a...
Article
Full-text available
Plate subduction greatly influences the physical and chemical characteristics of Earth's surface and deep interior, yet the timing of its initiation is debated because of the paucity of exposed rocks from Earth's early history. We show that the titanium isotopic composition of orthogneisses from the Acasta Gneiss Complex spanning the Hadean to Eoar...
Article
Full-text available
Iron mobilization during continental weathering was pervasive before the Great Oxidation Event (GOE) that started at around 2.43 billion years (Ga) ago, due to the soluble nature of reduced iron. However, various geochemical proxies indicate transient oxygenation during formation in the Mesoarchean (∼2.95 Ga) Pongola Supergroup, South Africa, which...
Article
Recent work has demonstrated that titanium (Ti) isotopes undergo mass-dependent isotope fractionation during magmatic differentiation, leaving evolved silicic melts preferentially enriched in heavy Ti isotopes. Preferential incorporation of light Ti isotopes in crystallizing Fe-Ti oxides is thought to be the mechanism responsible for this fractiona...
Article
Full-text available
Changes in the composition of dust trapped in ice provide evidence of past atmospheric circulation and earth surface conditions. Investigations of dust provenance in Antarctic ice during glacial and interglacial periods indicate that South America is the primary dust source during both climate regimes. Here, we present results from a new ice core d...
Article
The generation, transport, and deposition of mineral dust are detectable in paleoclimate records from land, ocean, and ice, providing valuable insight into earth surface conditions and cycles on a range of timescales. Dust deposited in marine and terrestrial ecosystems can provide critical nutrients to nutrient-limited ecosystems, and variations in...
Article
The residence time of subglacial meltwater impacts aquifer recharge, nutrient production, and chemical signals that reflect underlying bedrock/substrate, but is inaccessible to direct observation. Here we report the seasonal evolution of subglacial meltwater chemistry from the 2011 melt season at the terminus of the Athabasca Glacier, Canada. We me...
Article
Full-text available
Dust provides ecosystem-sustaining nutrients to landscapes underlain by intensively weathered soils. Here we show that dust may also be crucial in montane forest ecosystems, dominating nutrient budgets despite continuous replacement of depleted soils with fresh bedrock via erosion. Strontium and neodymium isotopes in modern dust show that Asian sou...
Article
The Upper Fremont Glacier (UFG), Wyoming, is one of the few continental glaciers in the contiguous United States known to preserve environmental and climate records spanning recent centuries. A pair of ice cores taken from UFG have been studied extensively to document changes in climate and industrial pollution (most notably, mid-19th century incre...
Data
Excel workbook containing all measured radiogenic isotope compositions and major and trace elements, masses and dates of collection for the dust samples collected at the ssCZO sites. Also included are the calculated dust contributions from Asia and the California Central Valley based on isotopic compositions of the endmembers.
Data
Excel workbook containing previously published bulk bedrock compositions, erosion rates, and regolith fluxes to soil for the ssCZO region. Also included are the summarized calculations of P fluxes from regolith and dust.
Article
Recent declines in ice shelf and sea ice extent experienced in polar regions highlight the importance of evaluating variations in local weather patterns in response to climate change. Airborne mineral particles (dust) transported through the atmosphere and deposited on ice sheets and glaciers in Antarctica and Greenland can provide a robust set of...
Conference Paper
Airborne mineral particles (dust) in the atmosphere are capable of influencing local and global climate via radiative forcing and can supply critical nutrients to marine and terrestrial biospheres. Additionally, dust deposited on snowpacks and glaciers may cause earlier seasonal melting affecting the hydrological cycle. The sources and transport pa...
Article
Full-text available
Isotopic characterization of aerosol mineral particles (atmospheric dust) of varying sizes is essential in classifying source areas, and for determining the source of dust deposited over oceans and icesheets. However, the effect of atmospheric transport on radiogenic isotopic compositions is not well constrained, making provenance interpretation di...
Article
Little is known about the time it takes precipitation, input of water from reservoirs, surface melt, and basal melt to migrate to the base of a glacier and discharge. Previous work on the residence time of subglacial water has proven to be either inconclusive or inconsistent. Our research will address the primary subglacial water questions; the flu...
Conference Paper
Isotopic characterization of aerosol mineral particles (dust) of varying sizes is essential in classifying potential source areas and determining the correct source of dust deposited over oceans and icesheets. The Sahara is considered a dominant source of aerosol dust in the Northern Hemisphere. Weathering, size, and mineral sorting can have an eff...
Article
The central section of the Surprise Valley, NE California, in the westernmost section of the Basin and Range province contains a geothermal system related to extensional tectonics. Most geophysical research related to this geothermal system has focused primarily on the Lake City hot springs. Our work includes several other hot springs within the va...

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