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Klimaændringer i Arktis

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Master Thesis or Internship announcement

In-situ growth controls of glacial microbial communities on the Greenlandic Ice Sheet

Are you interested in Arctic microbiology? Did you ever want to try out microscopy? Are you eager to work within an international research group with a great working atmosphere?

Location: Risø, Roskilde, DK

Start: flexible, around end of 2020/begin of 2021

Background:

Glaciers and Icesheets are a habitat for a diverse range of species. Among them, micro-algae play an important role for local biogeochemical processes and they contribute significantly to the ice melt by darkening the ice surface and lowering its reflectivity. The contribution of glacier algae to the darkening of the Greenland ice sheet (GrIS) has received particular attention considering its global consequences associated with its ice mass loss.

We still lack a basic understanding on the factors controlling the growth and survival of the glacial community. Particularly, in-situ data on the growth controls of glacier algae are rare. It is a key question whether glacier algae will colonise more areas of the GrIS as a response to increasing ice melt and prolonged growth seasons due to an early snow retreat.

The project:

We are advertising a thesis Project (approx. 30 ECTS) or an Internship (approx. 3-5 months) to work on samples collected during an in-situ experiment on Greenland this year aiming to investigate the effect of nutrient fertilisation on the growth of the community.

The work will involve mainly the counting of the community samples and identification using light microscopy and the associated data analysis. This work is important to help us to better understand the distribution and growth of the algae. Depending on the length of the project, your educational level and your interests, the project can be adjusted and could also involve additional data analysis of nutrient, photophysiology (PAM) or albedo (reflectivity) data to interpret your results in a bigger context.

In our group at Aarhus University (located at the Risø campus in Roskilde) we combine a diverse range of tools to study the glacier algae e.g. pigment analysis, microscopy, molecular analysis, metabolomics, lab-cultivations etc., therefore, you can also get the chance to look a bit into other methods if you wish. You will also join our regular meetings and thereby, get the chance to get insights into the diverse work of our group.

Supervisors: Laura Halbach (PhD student) and Prof. Alex Anesio

Contact: Laura, by writing to lh@envs.au.dk if you are interested or have questions.

More infos at: envs.au.dk/en/research-areas/climate-changes-in-arctic/cryo-microbiology/

www.deeppurple-ercsyg.eu

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Klimaændringers indvirkning på den Arktiske forurening med POPer

Baggrund

Persistente organiske forbindelser (POPer) er svært nedbrydelige stoffer, der har skadelige effekter på dyr og mennesker og som har en tendens til at blive opkoncentreret i Arktis (eksempelvis DDT, Dioxin og bromerede flammehæmmere). Ved hjælp af DEHM-modellen drevet af meteorologiske input fra en klimamodel kan det undersøges, hvordan fremtidige klimaændringer påvirker transporten og skæbnen af POPer i Arktis i forhold til under nutidige forhold hvor modellen er drevet af meteorologiske data fra en vejrprognosemodel.

Forudsætninger

Kendskab til eller lyst til at lære Fortran-programmering.

Kontaktperson: Kaj Mantzius Hansen, kmh@dmu.dk, tlf. 87 15 86 58.