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Permafrost thawing in high-Arctic causing increased organic carbon and dissolved nitrogen export to sea

General

Organisation
Project start
01.01.2020
Project end
01.07.2023
Type of project
Research
Project theme
Limnic ecosystems
Project topic
Biogeochemistry
Biology
Carbon
Climate research
Cryosphere
Ecology
Ecosystems, aquatic
Ice - ocean coupling
Microbiology

Fieldwork / Study

Fieldwork country
Greenland (DK)
Fieldwork region
Greenland, North-East
Fieldwork location

Geolocation is 74.4694302, -20.5733121

Fieldwork start
01.08.2021
Fieldwork end
14.08.2021

Fieldwork / Study

Fieldwork country
Greenland (DK)
Fieldwork region
Greenland, Mid-West
Fieldwork location

Geolocation is 69.2437661, -53.5413188

Fieldwork start
01.08.2022
Fieldwork end
14.08.2022

Project details

26.11.2020
Science / project plan

The overall aim of this project is to determine how climate-induced permafrost thaw and thermokarst activity will influence organic carbon (OC) and nitrogen (N) processing in high-Arctic streams and to estimate export rate of terrestrial OC and N to the sea under current and future climate.
We will set our studies in two high-Arctic areas (Zackenberg and at Arctic Station Disko Island) in order to extend our research findings into a broader high-Arctic setting. We aim to 1) quantify OC and N run-off from areas affected by thermo-karst and permafrost thaw using SUNA nitrate sensors for real-time nitrate measurements in streams; and 2) estimate reach scale denitrification using N2 gas measurements made with a MIMS instrument located at Notre Dame. The results will feed directly into sea export models predicting changes under climate change scenarios.

Publications related to project

Skovsholt, L.J, Pastor, A., Docherty, C.L., Milner, A.M., Riis, T. (2020) Changes in hydrology affects stream nutrient uptake and primary production in a high-Arctic stream. Biogeochemistry (IF 3.7), accepted

Pastor, A., Wu, N., Skovsholt, L.S., Riis, T. (2020) Biofilm growth in two streams draining mountainous permafrost catchments in NE Greenland. Journal of Geophysical Research – Biogeosciences, 125(3), e2019JG005557; (IF 3.5)

Pastor, A., Poblador, S., Skovsholt, L.J., Riis, T. (2020) Microbial carbon and nitrogen processes in high-Arctic riparian soils. Permafrost and Periglacial Processes, 31, 223-236 (IF 3.0)

Pastor, A.O., Freixa, A., Skovsholt, L.J., Wu, N., Romani, A.M., Riis, T. (2019) Microbial organic matter utilization in High-Arctic streams: key enzymatic controls. Microbial Ecology, 78(3), 539-554 (IF 3.6).

 

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