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Congratulations Dr. Tegler!
Congratulations to Dr. Logan Tegler, who successfully defended her Ph.D. thesis today! Logan’s thesis is titled: “From the atmosphere to the abyss: Tracing organic carbon deposition, cadmium isotopes, and iron cycling using marine sediments,” and is available to download from DSpace@MIT. Well done Logan, incredible work!
AT50-10 ‘CliOMZ’ wrapped!
After 37 days at sea, AT50-10 ‘CliOMZ’ is complete, arriving in San Diego this morning. We sailed over 5,500 nautical miles, crossed the Equator twice, occupied 17 stations, and collected over 1,500 samples, which should keep us busy for a while! Below are a selection of photos from the expedition. …
AT50-10 ‘CliOMZ’ Underway!
NIRVANA Lab members Peter Crockford, Ichiko Sugiyama, and Tristan Horner are in Golfito, Costa Rica, for the start of AT50-10 ‘CliOMZ,’ which sets sail on WHOI’s very own R/V Atlantis today. We will be studying connections between macro- (nitrate, phosphate) and micronutrients, such as iron, copper, iodine, and barium, in the low-oxygen waters of the…
Lab Writing Retreat 2023
Seven members of the NIRVANA Labs, along with two special guests, journeyed to Yarmouth Port for our annual Lab Writing Retreat. Once again, we were delighted to welcome Ann Dunlea, who is collaborating with several group members on various projects, and Laura Motta, the newest Assistant Scientist in the Department of Marine Chemistry & Geochemistry.…
Papers in press: Isotopic investigations of ion exchange in barite
Two studies published by Jule Middleton documenting the rates, sensitivities, and barium-isotopic consequences of ion exchange in barite. The first paper investigated how fast and how much ion exchange affected the isotope composition of barium in barite–fluid systems. We did this by performing laboratory experiments under marine-relevant conditions. The main findings are that ion exchange…
Paper in press: Tracking thallium on tidal timescales
A new study published by Chad Ostrander in Geochimica et Cosmochimica Acta examining thallium cycling in Siders Pond, a salt-stratified, low-oxygen, sulfide-rich body of water right here in Falmouth! The thallium isotope composition of marine sediments is a valuable tool for studying historical oxygen dynamics on Earth. This proxy relies on the sensitivity of thallium…
GEOTRACES GP17-OCE Underway!
The penultimate U.S. GEOTRACES section cruise, GP17-OCE, is underway! Two members of the NIRVANA Lab, Margot Debyser and Iulia Streanga, are on board. Sailing with them is NIRVANA alum Jule Middleton, who is the Nutrient Supertech for this leg. Prior to sailing, all expedition participants had to participate in a seven-day quarantine for COVID-19. Margot…
Welcome Ichiko!
I’m pleased to welcome Ichiko Sugiyama, Postdoctoral Investigator, to NIRVANA! Ichiko will be using iron isotopes to quantify microbial metal demand in the Eastern Tropical Pacific. She is working jointly with Mak Saito and Tristan Horner on a project supported by the Ocean & Climate Innovation Accelerator consortium. Welcome Ichiko! Check out: Ichiko’s Twitter (@FerrousChiko),…
Welcome Margot!
We are pleased to welcome Margot Debyser, Postdoctoral Investigator, to the NIRVANA Labs! Margot will be leading lab efforts to constrain the cycling of radium and barium isotopes along the US GEOTRACES GP17 transect with Matt Charette and Tristan Horner.
Gathering at Goldschmidt
Several team members from the NIRVANA Labs are presenting their research at the 2022 Goldschmidt Conference in Honolulu HI this week, including: East Greenland’s rising impact on the marine silicon cycle constrained by silicon isotopes, presented by Georgi Laukert (Monday 11th, 11:15 HST) Barium isotope fractionation during ion exchange at the barite-fluid interface: Implications for…