Arctic Field Projects



Project Title: The Greenland GPS Network (GNET): Geodetic characterization of water vapor, climate cycles, climate change and ice mass balance (Award# GNET)

PI: Madsen, Finn Bo (bm@space.dtu.dk )
Phone: 45(45) 25 -9784 
Institute/Department: DTU Space, Technical University of Denmark,  
IPY Project?
Funding Agency: US\Federal\NSF\GEO\OPP\ARC\RSL
Program Manager: Dr. Roberto Delgado (robdelga@nsf.gov)
Discipline(s): | Cryosphere | Geological Sciences | Space Physics |

Project Web Site(s):
Data: ftp://ftp.spacecenter.dk/pub/abbas/GNET/v1/
Data: http://facility.unavco.org/data/data.html
Project: http://polenet.org/

Science Summary:
This project will continue operation of the Greenland GPS Network (GNET). GNET has proven highly successful in "weighing" the Greenland ice sheet by tracking the earth's elastic response to changing surface loads. The PIs will extend the life of GNET so that it can continue to sense space-time changes in ice mass, including spatial shifts in the position of the centers of ice loss, and accelerations in mass change rates. GNET is now resolving seasonal oscillations in the vertical and horizontal position of the earth's crust as well as longer-term trends. These oscillations reflect seasonal changes in the loads placed on the solid earth by both the atmosphere and the ice sheet. The atmospheric pressure signal can be removed, using state-of-the-art weather models, in order to isolate the signal due to changes in the ice sheet. As part of the pressure analysis, they will also produce a time series of integrated water vapor for each station in GNET, with benefits for weather and climate predictions. Scientifically, GNET is addressing a problem of great interest and also considerable societal importance: the trajectory and magnitude of Greenland mass balance. With current and potential additional gaps in satellite geodesy coverage of Greenland, GNET is a cornerstone of our observations of the cryosphere. The data are openly accessible and are available in near real-time through UNAVCO. Level 2 data - 3D time series of solid earth deformation for the cryosphere community is available from DTU Space: ftp://ftp.spacecenter.dk/pub/abbas/GNET/v1/).

Logistics Summary:
This effort is a continuation of previous NSF awards: 0632320, 1023566, and 1111882. During one year of field work in 2017 a team of two will install a 'test station' in Thule to assess a new geodetic receiver, and will also visit two existing sites (MARG, DKSG) near Thule that are in need of maintenance. In southeast Greenland researchers will perform maintenance on the sites as far north at Sodalen. The team will travel via helicopter and preform maintenance on a total of 15 southeast sites (SENU, NNVN, UTMG, TIMM, HJOR, TREO, LYNS, KULU, KBUG, ISOR, HEL2, KSNB, PLPK, KUAQ, MIK2). Additionally, a new DTU site in Paamiut will be installed by DTU prior to the start of the GNET August field work. The GNET team member installing the site in Paamiut may be picked up by the helicopter as it passes through to refuel. In 2017 the main tasks will be to replace electronic boards/receivers at nine of the stations and test batteries, plug antenna drainage holes, and inspect and replace any damaged components at all of the sites. Six batteries and associated battery case will be installed at TIMM. In a separate trip in 2017, DTU will visit six GNET sites north of Sodalen up to Daneborg (VFDG, DGJG, MSVG, HMBG, WTHG, DANE). They will replace the system board at MSVG and test the batteries and plug antenna drainage holes at all of the sites. GNET technicians will return in 2018 where the focus will be on GNET stations in the north and western part of Greenland. The main tasks will be to replace receivers in 16 remote and 5 settlement locations, plug antenna drainage holes and perform operations and maintenance on each station. They will visit a total of 23 stations while en-route from Station Nord to Nuuk via AS-350B3 helicopter. The helicopter will carry two team members who will camp at various sites along the way, as well as stay overnight in accommodations at the following locations: Nord, Thule, Upernavik, Ilulissat, and Nuuk. In the spring of 2018, DTU Space purchased fuel drums in Copenhagen and then arranged with Royal Danish Air Force to have them flown to Thule. The drums were then filled with JP-8 fuel in Thule and some were flown to Nord via the annual re-fueling mission. The rest of the drums (including six from CPS) were filled with fuel and staged in Thule to await the DTU Space Twin Otter charter in early August to fly them to different GNET locations in North Greenland just prior to their helicopter charter starting from Station Nord.

CPS will provide Air National Guard coordination for cargo US to/from Greenland as well as delivery of the items to AirGL Freight Dept for shipping to the different locations in Greenland as well as fuel in Thule. UNAVCO will provide equipment, batteries, and technical support. All other logistics will be organized and paid for by the project.
SeasonField SiteDate InDate Out#People
2017Greenland - Constable Point07 / 28 / 2017 07 / 30 / 20172
2017Greenland - Daneborg07 / 29 / 2017 07 / 29 / 20172
2017Greenland - Daugaard-Jensens Glacier07 / 28 / 2017 07 / 28 / 20172
2017Greenland - Docker Smith Glacier06 / 08 / 2017 06 / 08 / 20172
2017Greenland - Hamberg Gletscher07 / 29 / 2017 07 / 29 / 20172
2017Greenland - Helheim Glacier08 / 22 / 2017 08 / 22 / 20172
2017Greenland - Hjornefjeldet08 / 21 / 2017 08 / 21 / 20172
2017Greenland - Isortoq08 / 22 / 2017 08 / 22 / 20172
2017Greenland - Kagssortôq08 / 20 / 2017 08 / 21 / 20172
2017Greenland - Kangerlussuaq06 / 03 / 2017 08 / 28 / 20172
2017Greenland - Koge Bugt08 / 22 / 2017 08 / 22 / 20172
2017Greenland - Kulusuk08 / 21 / 2017 08 / 22 / 20172
2017Greenland - Lynaes Peninsula08 / 21 / 2017 08 / 21 / 20172
2017Greenland - Marie Glacier06 / 10 / 2017 06 / 10 / 20172
2017Greenland - Mestersvig07 / 28 / 2017 07 / 30 / 20172
2017Greenland - Mikis Fjord08 / 24 / 2017 08 / 24 / 20172
2017Greenland - Narsarsuaq08 / 19 / 2017 08 / 27 / 20172
2017Greenland - Niviarsiat Nunatak North (NNVN)08 / 19 / 2017 08 / 19 / 20172
2017Greenland - Nuuk08 / 17 / 2017 08 / 29 / 20172
2017Greenland - Paamiut08 / 19 / 2017 08 / 19 / 20172
2017Greenland - Pilagpik08 / 23 / 2017 08 / 23 / 20172
2017Greenland - Sermip Nunatak08 / 19 / 2017 08 / 19 / 20172
2017Greenland - Sodalen08 / 23 / 2017 08 / 24 / 20172
2017Greenland - Steenstrup Nordre Brae08 / 21 / 2017 08 / 21 / 20172
2017Greenland - Tasiilaq08 / 22 / 2017 08 / 26 / 20172
2017Greenland - Thule06 / 06 / 2017 06 / 16 / 20172
2017Greenland - Timmiarmiut08 / 20 / 2017 08 / 20 / 20172
2017Greenland - Upper Timmiarmiut Glacier08 / 20 / 2017 08 / 20 / 20172
2017Greenland - Vestfjord Gletscher07 / 28 / 2017 07 / 28 / 20172
2017Greenland - Walterhausen Glacier07 / 29 / 2017 07 / 29 / 20172
2018Greenland - Astrup Kystland08 / 16 / 2018 08 / 16 / 20182
2018Greenland - Blaaso08 / 12 / 2018 08 / 12 / 20182
2018Greenland - CassFjord Fuel201108 / 06 / 2018 08 / 15 / 20182
2018Greenland - CentrumSoFuel2011 08 / 12 / 2018 08 / 12 / 20182
2018Greenland - Daneborg08 / 03 / 2018 08 / 03 / 20181
2018Greenland - Docker Smith Glacier08 / 15 / 2018 08 / 16 / 20182
2018Greenland - Halls Grave08 / 06 / 2018 08 / 14 / 20182
2018Greenland - Harder Gletscher08 / 14 / 2018 08 / 14 / 20182
2018Greenland - HiawathaGl200908 / 07 / 2018 08 / 15 / 20182
2018Greenland - Ilulissat08 / 17 / 2018 08 / 19 / 20182
2018Greenland - Jakobshavn Glacier08 / 17 / 2018 08 / 17 / 20182
2018Greenland - Jewell Fjord08 / 13 / 2018 08 / 13 / 20182
2018Greenland - Joe Oer08 / 14 / 2018 08 / 14 / 20182
2018Greenland - Jorgen Bronlund Fjord08 / 13 / 2018 08 / 13 / 20182
2018Greenland - Kangerlussuaq07 / 29 / 2018 08 / 22 / 20182
2018Greenland - Kangia08 / 17 / 2018 08 / 17 / 20182
2018Greenland - Kap Agassiz08 / 15 / 2018 08 / 15 / 20182
2018Greenland - Kap Morris Jessup08 / 04 / 2018 08 / 13 / 20182
2018Greenland - Kap Schoubye08 / 14 / 2018 08 / 14 / 20182
2018Greenland - Kapisillit08 / 20 / 2018 08 / 20 / 20182
2018Greenland - KHaraldMolkte201108 / 04 / 2018 08 / 13 / 20182
2018Greenland - Leffingwell Nunatak08 / 12 / 2018 08 / 12 / 20182
2018Greenland - Marie Glacier08 / 15 / 2018 08 / 15 / 20182
2018Greenland - NaresLandFuel201308 / 04 / 2018 08 / 14 / 20182
2018Greenland - Norske Oer08 / 12 / 2018 08 / 12 / 20182
2018Greenland - Nuuk08 / 20 / 2018 08 / 22 / 20182
2018Greenland - Rinks Isbrae08 / 17 / 2018 08 / 17 / 20182
2018Greenland - Sermip Nunatak08 / 17 / 2018 08 / 17 / 20182
2018Greenland - Station Nord08 / 03 / 2018 08 / 13 / 20182
2018Greenland - Thule07 / 30 / 2018 08 / 16 / 20182
2018Greenland - Upernavik08 / 16 / 2018 08 / 17 / 20182
2019Greenland - Kangerlussuaq08 / 02 / 2019 08 / 03 / 20192
2019Greenland - Nuuk08 / 04 / 2019 08 / 08 / 20192
 


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