Posts Tagged «Biological Research»

This project devises low-temperature liquid-water environments mimicking the known chemistry of brines. The research team measures microbial growth rate, metabolic activity, ability to survive while inactive, and longevity for psychrophiles to reveal proteomic biosignatures for growth, activity, and survival strategies, and understand key molecular responses of life in these environments.

This project has two main objectives: 1) determination of the physical and microbial characteristics and microstructural evolution of sea ice exposed to severe melt; and 2) exploration of the influence of biogenic particles such as sea ice algae, bacteria and polymer gels on the melting behavior of sea ice.

This project characterizes the Greenland Ice Sheet’s subglacial microbial communities to investigate the effect of microbes on lithospheric weathering and nutrient fluxes from the GrIS margin in West Greenland.

Gurarie, E., R. Andrews, and K.L. Laidre,’ A novel method for identifying behavioral changes in animal movement data’, Ecol. Lett., 12, 395-408, 2009.

K. Junge, H. Eicken, B. D. Swanson and, J. W. Deming. “Bacterial incorporation of leucine into protein down to –20°C with evidence for potential activity in subeutectic saline ice formations”. Cryobiol. 52: 417–429, 2006.

This project will explore the relationship between deep-freeze bacterial activity, proteomics, polymers and the physical state of the ice and will provide important keys to questions regarding life under extreme conditions, be it in the various ice formations here on Earth, the atmosphere or elsewhere in the universe.

This project will carry out quantitative assessment of the drivers, effects, and ramifications of the seasonal timing of sea ice melt onset and freeze initiation over the observational record and using earth system model projections of future climate.

The response of Arctic sea ice to a warming climate includes decreases in extent, lower ice concentration, and reduced ice thickness. Summer melt seasons are lengthening with earlier melt onsets and later autumn freezeups. We believe this will likely lead to an increase in so-called “rotten ice” in the Arctic at the end of summer. This ice has experienced a long summer of melt, is fragile, difficult to work with, and has received little attention. Comprehensive information on its physical and microbiological properties does not exist. Our team is embarking on an ambitious field campaign in order to study this poorly-understood type of sea ice in the context of its microstructural properties and potential for habitability.

The focus of this project is to work collaboratively with Dr. Donald Perovich (CRREL) in support of a NASA sponsored program, ICESCAPES. Bonnie Light will support this project by helping to characterize the morphological and optical properties of the sea ice cover through field measurements, radiative transfer modeling, and synthesis.

This part of the larger NASA ICESCAPE project examines the long-term, seasonal variability in phytoplankton abundance as a function of changes in sea ice cover, stratification, and temperature regimes measured in the Beaufort and Chukchi Seas throughout the growing season.