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Collaborative Research: Understanding GrIS moulin hydrology and links to ice motion

General

Project start
01.01.2016
Project end
31.12.2019
Type of project
ARMAP/NSF
Project theme
Cryosphere
Project topic
Cryosphere

Fieldwork / Study

Fieldwork country
Greenland (DK)
Fieldwork region
Greenland Ice Sheet
Fieldwork location

Geolocation is 69.5253, -49.042

Fieldwork start
20.10.2017
Fieldwork end
20.10.2017

SAR information

Fieldwork / Study

Fieldwork country
Greenland (DK)
Fieldwork region
Greenland Ice Sheet
Fieldwork location

Geolocation is 69.5253, -49.042

Fieldwork start
19.10.2017
Fieldwork end
19.10.2017

SAR information

Fieldwork / Study

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

Geolocation is 69.2166667, -51.1

Fieldwork start
19.10.2017
Fieldwork end
23.10.2017

SAR information

Fieldwork / Study

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

Geolocation is 67.0179977417, -50.69400024414

Fieldwork start
18.10.2017
Fieldwork end
24.10.2017

SAR information

Fieldwork / Study

Fieldwork country
Greenland (DK)
Fieldwork region
Greenland Ice Sheet
Fieldwork location

Geolocation is 69.5253, -49.042

Fieldwork start
25.07.2018
Fieldwork end
11.08.2018

SAR information

Fieldwork / Study

Fieldwork country
Greenland (DK)
Fieldwork region
Greenland Ice Sheet
Fieldwork location

Geolocation is 69.5253, -49.042

Fieldwork start
06.07.2018
Fieldwork end
20.07.2018

SAR information

Fieldwork / Study

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

Geolocation is 69.2166667, -51.1

Fieldwork start
08.08.2018
Fieldwork end
29.08.2018

SAR information

Fieldwork / Study

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

Geolocation is 67.0179977417, -50.69400024414

Fieldwork start
07.08.2018
Fieldwork end
30.08.2018

SAR information

Fieldwork / Study

Fieldwork country
Greenland (DK)
Fieldwork region
Greenland Ice Sheet
Fieldwork location

Geolocation is 69.5253, -49.042

Fieldwork start
05.08.2019
Fieldwork end
05.08.2019

SAR information

Fieldwork / Study

Fieldwork country
Greenland (DK)
Fieldwork region
Greenland Ice Sheet
Fieldwork location

Geolocation is 69.5253, -49.042

Fieldwork start
06.08.2019
Fieldwork end
06.08.2019

SAR information

Fieldwork / Study

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

Geolocation is 69.2166667, -51.1

Fieldwork start
03.08.2019
Fieldwork end
10.08.2019

SAR information

Fieldwork / Study

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

Geolocation is 67.0179977417, -50.69400024414

Fieldwork start
01.07.2019
Fieldwork end
10.07.2019

SAR information

Project details

02.09.2019
Science / project plan

,

Science / project summary
The melting of the Greenland ice sheet is not a simple issue of warmer air temperatures melting the surface ice, which then flows into the ocean. Surface meltwater can flow deep into the glacier through natural pipes known as moulins. These subsurface channels not only transmit water to some outlet, where it flows into the ocean, but may also influence the downslope sliding of the glacier toward the ocean. To better understand the controls that govern glacier sliding, the researchers will conduct field and model studies on the Greenland ice sheet. Researchers will instrument a number of moulins with pressure sensors. Glacier velocity will be measured with GPS sensors. Discharge will be monitored through dye tracing. Simulations will be conducted to integrate the observations with a number of simple ‘conduit’ models in the hope of providing a better and more comprehensive understanding of the processes that govern glacier sliding. Beyond the training of graduate and undergraduate students, the researchers will work with a journalism student at the University of Arkansas to produce a documentary about their field experience. This collaboration provides a unique opportunity to communicate to the general public. It is thought that increased channelization reduces subglacial water pressure and acts to buffer the Greenland Ice Sheet (GrIS) against large increases in ice velocity. However, few measurements of water pressure have been made in channelized subglacial drainage systems to test this hypothesis. The researchers will obtain synoptic supraglacial stream discharge data, moulin water level and ice velocity at two moulin sites along an ice flow line in the Paakitsoq Region of the GrIS. Data will be analyzed, and used to parameterize model experiments, to determine the degree to which: 1) local versus regional inputs of melt water control moulin water levels; 2) changes in effective pressure that occur along ice flow paths affect local relationships between subglacial water pressure and ice velocity.
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