Temperature measurements at three subaquatic sites in the Mackenzie Delta, Northwest Territories, Canada ...

Bottom water temperatures in lakes and the near-shore Arctic Ocean are usually below 4°C. If the water depth is shallow enough, the sea/lake ice freezes to the sea/lake bed and may significantly shift the mean annual temperature below zero. Thus, pre-existing permafrost may survive inundation but un...

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Bibliographic Details
Main Authors: Miesner, Frederieke, Cable, William L, Boike, Julia
Format: Dataset
Language:English
Published: PANGAEA 2022
Subjects:
active layer
Bathymetry
Canadian Arctic
Permafrost
talik
Temperature
Water Depth
Event label
DATE/TIME
LATITUDE
LONGITUDE
ELEVATION
Temperature, soil
Temperature Lance
CA-Land_2021_NWCanada
AWI Arctic Land Expedition
Modular Observation Solutions for Earth Systems MOSES
Permafrost Research AWI_Perma
Permafrost Research Periglacial Dynamics @ AWI AWI_PerDyn
Arctic
Arctic Ocean
Canada
Mackenzie Delta
Moses
Northwest Territories
Talik
Ice
permafrost
Online Access:https://dx.doi.org/10.1594/pangaea.949290
https://doi.pangaea.de/10.1594/PANGAEA.949290
Description
Summary:Bottom water temperatures in lakes and the near-shore Arctic Ocean are usually below 4°C. If the water depth is shallow enough, the sea/lake ice freezes to the sea/lake bed and may significantly shift the mean annual temperature below zero. Thus, pre-existing permafrost may survive inundation but undergoes a rapid warming of up to 10°C. Taliks form and grow deeper over time. The temperature regime below the water is therefore directly dependent on the water depth and small changes can have a huge impact. Measurements of the sediment temperature below shallow water bodies are scarce, and single temperature-chains in boreholes are not sufficient to map spatial variability. We are using a new temperature lance to measure temperature profiles in lake sediments. The device is a 1.5m steel lance with 30 sensors at 5cm spacing that can be pushed or hammered into the sediment. The sensors equilibrate to sensor accuracy within 10min, allowing for repeat measurements to cover the spatial variability. As part of the ...

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