6 Works

Data from the 2018 dye release cruise south of Martha’s Vineyard, MA

Irina Rypina, Anthony Kirincich & Thomas Peacock
On Aug 16-17, 2018 a rhodamine dye experiment was conducted in the coastal ocean south of Martha’s Vineyard, MA. One of the experiment’s aims was to investigate the exchanges, or the absence of such, between the mixed layer and the ocean underneath over a time scale of about a day.

Is Journalistic Truth Dead? Measuring How Informed Voters Are about Political News (LIEPP Working Paper, n°128)

Charles Angelucci & Andrea Rodríguez Prat
How many voters are informed about political news mainstream journalists consider important? We develop a methodology that combines a protocol for identifying major news stories, online surveys, and the estimation of a model that disentangles individual information precision from news story salience and partisanship. We focus on news about U.S. politics in a monthly sample of 1,000 voters repeated 8 times. On average, 85% of individuals are able to distinguish the major real news story...

Sea-level rise will drive divergent sediment transport patterns on fore reefs and reef flats, potentially causing erosion on Atoll Islands

James Bramante, Andrew D. Ashton, Curt D. Storlazzi, Olivia M. Cheriton & Jeffrey P. Donnelly
Atoll reef islands primarily consist of unconsolidated sediment, and their ocean-facing shorelines are maintained by sediment produced and transported across their reefs. Changes in incident waves can alter cross-shore sediment exchange and thus affect the sediment budget and morphology of atoll reef islands. Here we investigate the influence of sea-level rise and projected wave climate change on wave characteristics and cross-shore sediment transport across an atoll reef at Kwajalein Island, Republic of the Marshall Islands....

AI3SD Video: Audacity of huge: Machine Learning for the discovery of transition metal catalysts and materials

Heather Kulik & Jeremy G. Frey
I will discuss our efforts to use machine learning (ML) to accelerate the computational tailoring and design of transition metal complexes and metal-organic framework (MOF) materials. One limitation in a challenging materials space such as open shell, 3d transition metal chemistry is that ML models and ML-accelerated high-throughput screening traditionally rely on density functional theory (DFT) for data generation, but DFT is both computationally demanding and prone to errors that limit its accuracy in predicting...

Causes of oceanic crustal thickness oscillations along a 74-Myr Mid-Atlantic Ridge flow line

William Shinevar, Hannah Mark, Fiona Clerc, Emmanuel A. Codillo, Jianhua Gong, Jean-Arthur Olive, Stephanie Brown, Paris T. Smalls, Yang Liao, Véronique Le Roux & Mark Behn
Gravity, magnetic, and bathymetry data collected along a continuous 1400-km-long spreading-parallel flow line across the Mid-Atlantic Ridge indicate significant tectonic and magmatic fluctuations in the formation of oceanic crust over a range of timescales. The transect spans from 28 Ma on the African Plate to 74 Ma on the North American plate, crossing the Mid-Atlantic Ridge at 35.8 ºN. Gravity-derived crustal thicknesses vary from 3–9 km with a standard deviation of 1 km. Spectral analysis...

Symbiotic moss-cyanobacteria associations as a novel source of biological N2-fixation in temperate grasslands

Lalita Calabria, Kate Peterson, Amanda Bidwell & Sarah Hamman
Aims. Terrestrial mosses contribute significantly to nitrogen budgets in boreal forests through symbiotic associations with N2-fixing cyanobacteria, but few studies have considered these interactions in temperate systems. We investigated how N2-fixation by moss-cyanobacterial associations contribute spatio-temporally to site-level N dynamics in a western North American prairie ecosystem. Methods. We first tested for the presence of N2-fixing cyanobacteria on six moss species using epi-fluorescence light microscopy. We then used an acetylene reduction assay to estimate monthly...

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