Tag Archives: Jahn

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Kīlauea Lava Fuels Phytoplankton Bloom off Hawaiʻi Island

A new study led by Samuel T. Wilson from the University of Hawai’i, co-authored with  Darwin Project researchers John Casey, Stephanie Dutkiewicz, Mick Follows, Christopher Hill, and Oliver Jahn, uses the Darwin ecosystem model embedded within an MITgcm (~2 km) resolution regional physical model of the North Pacific Ocean to study how the input of silicic acid, iron, nitrate, and phosphate along the southeast coast of Hawai‘i impacts nearby phytoplankton productivity. Continue reading

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What you Can Do With a Really Rather Realistic Ocean Model

Helen Hill | Darwin Project

It’s been a decade since the inception of the MIT Darwin Project, an alliance between physical oceanographers, biogeochemists and marine microbiologists at the Massachusetts Institute of Technology (MIT). The goal of Darwin remains to couple state of the art physical models of global ocean circulation with biogeochemistry and genome-informed models of microbial processes to understand the interplay between different elements of the marine ecosystem leading to observed balances between physiology and the marine environment. Continue reading

Image credit: Christian Sardet, Tara Expeditions

Uncovering a Diverse Invisible Ocean World

Read this story at oceans.mit.edu

Tara Oceans, an international consortium of researchers that explored the world’s oceans in hopes of learning more about one of its smallest inhabitants, reported their initial findings this week in a special issue of Science. Plankton are vital to life on Earth—they absorb carbon dioxide, generate nearly half of the oxygen we breathe, break down waste, and are a cornerstone of the marine food chain. Now, new research indicates the diminutive creatures are not only more diverse than previously thought, but also profoundly affected by their environment. Continue reading

Villar, E., Farrant, G.K., Follows, M.J., et al, 2015, Environmental characteristics of Agulhas rings affect interocean plankton transport. Science, Vol. 348 no. 6237, doi: 10.1126/science.1261447

NO3, Fe, and diazotroph biomass - observations (left) and model (right) over top 50 m - from Fig 1, Dutkiewicz et al, 2014

Life on the Edge – How shifting marine province boundaries could provide a new metric for global change

In their new competition theory paper, appearing in the 2014 issue of Biogeosciences, Dutkiewicz et al examine the sensitivity of the biogeography of nitrogen fixers to a warming climate and increased aeolian iron deposition in the context of a global earth system model. Continue reading

From Figure 5 of Levy et al (2014)

Mixing Down Diversity

Phytoplankton are an extremely diverse set of floating, microscopic organisms, which are freely transported by water movements (current, eddies, etc.) and make up the base of the oceanic food web. This work, published in the September issue of Limnology & Oceanography: Fluids & Environments,  explores how their diversity is affected by dispersal by different scales of motions in the ocean. Continue reading